1 | /** |
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2 | * This software is copyright (c) 2012-2016 by |
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3 | * - Institut fuer Deutsche Sprache (http://www.ids-mannheim.de) |
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4 | * This is free software. You can redistribute it |
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5 | * and/or modify it under the terms described in |
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6 | * the GNU General Public License v3 of which you |
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7 | * should have received a copy. Otherwise you can download |
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8 | * it from |
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9 | * |
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10 | * http://www.gnu.org/licenses/gpl-3.0.txt |
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11 | * |
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12 | * @copyright Institut fuer Deutsche Sprache (http://www.ids-mannheim.de) |
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13 | * |
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14 | * @license http://www.gnu.org/licenses/gpl-3.0.txt |
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15 | * GNU General Public License v3 |
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16 | */ |
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17 | package eu.clarin.sru.client; |
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18 | |
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19 | import java.io.ByteArrayInputStream; |
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20 | import java.io.IOException; |
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21 | import java.io.InputStream; |
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22 | import java.net.URI; |
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23 | import java.net.UnknownHostException; |
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24 | import java.util.ArrayList; |
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25 | import java.util.HashMap; |
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26 | import java.util.List; |
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27 | import java.util.Map; |
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28 | import java.util.concurrent.TimeUnit; |
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29 | |
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30 | import javax.xml.stream.XMLStreamException; |
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31 | import javax.xml.stream.XMLStreamReader; |
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32 | |
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33 | import org.apache.http.HttpEntity; |
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34 | import org.apache.http.HttpStatus; |
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35 | import org.apache.http.StatusLine; |
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36 | import org.apache.http.client.ClientProtocolException; |
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37 | import org.apache.http.client.config.CookieSpecs; |
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38 | import org.apache.http.client.config.RequestConfig; |
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39 | import org.apache.http.client.methods.CloseableHttpResponse; |
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40 | import org.apache.http.client.methods.HttpGet; |
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41 | import org.apache.http.config.SocketConfig; |
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42 | import org.apache.http.impl.NoConnectionReuseStrategy; |
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43 | import org.apache.http.impl.client.CloseableHttpClient; |
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44 | import org.apache.http.impl.client.HttpClients; |
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45 | import org.apache.http.impl.conn.PoolingHttpClientConnectionManager; |
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46 | import org.apache.http.protocol.HttpContext; |
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47 | import org.slf4j.Logger; |
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48 | import org.slf4j.LoggerFactory; |
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49 | |
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50 | |
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51 | /** |
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52 | * A simple client to perform SRU operations using callbacks. The application |
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53 | * must provide the appropriate callbacks to receive the results of the |
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54 | * operations. |
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55 | * <p> |
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56 | * This client is reusable but not thread-safe: the application may reuse a |
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57 | * client object, but it may not be concurrently shared between multiple |
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58 | * threads. |
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59 | * </p> |
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60 | * <p> |
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61 | * This class is modeled after Java's SAX-API. |
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62 | * </p> |
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63 | * |
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64 | * @see SRUExplainHandler |
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65 | * @see SRUScanHandler |
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66 | * @see SRUSearchRetrieveHandler |
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67 | * @see SRUDefaultHandlerAdapter |
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68 | */ |
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69 | public class SRUSimpleClient { |
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70 | private static final String USER_AGENT = "SRU-Client/1.0.0"; |
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71 | /** default version the client will use, if not otherwise specified */ |
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72 | private static final String SRU_DIAGNOSTIC_RECORD_SCHEMA = |
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73 | "info:srw/schema/1/diagnostics-v1.1"; |
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74 | private static final String VERSION_1_1 = "1.1"; |
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75 | private static final String VERSION_1_2 = "1.2"; |
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76 | private static final String VERSION_2_0 = "2.0"; |
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77 | private static final String RECORD_PACKING_PACKED = "packed"; |
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78 | private static final String RECORD_PACKING_UNPACKED = "unpacked"; |
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79 | private static final String RECORD_ESCAPING_XML = "xml"; |
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80 | private static final String RECORD_ESCAPING_STRING = "string"; |
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81 | private static final Logger logger = |
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82 | LoggerFactory.getLogger(SRUSimpleClient.class); |
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83 | private final SRUVersion defaultVersion; |
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84 | private final Map<String, SRURecordDataParser> parsers; |
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85 | private final CloseableHttpClient httpClient; |
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86 | private final HttpContext httpContext; |
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87 | private final XmlStreamReaderProxy proxy = new XmlStreamReaderProxy(); |
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88 | private final SRUExplainRecordDataParser explainRecordParser = |
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89 | new SRUExplainRecordDataParser(); |
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90 | |
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91 | |
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92 | /** |
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93 | * Constructor. |
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94 | * |
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95 | * @param config |
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96 | * the configuration to be used for this client. |
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97 | * @throws NullPointerException |
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98 | * if argument <code>config</code> is <code>null</code> |
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99 | * @throws IllegalArgumentException |
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100 | * if an error occurred while registering record data parsers |
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101 | * @see SRUClientConfig |
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102 | */ |
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103 | public SRUSimpleClient(final SRUClientConfig config) { |
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104 | if (config == null) { |
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105 | throw new NullPointerException("config == null"); |
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106 | } |
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107 | this.defaultVersion = config.getDefaultVersion(); |
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108 | |
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109 | // Initialize parsers lookup table ... |
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110 | final List<SRURecordDataParser> list = config.getRecordDataParsers(); |
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111 | if ((list == null) || list.isEmpty()) { |
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112 | throw new IllegalArgumentException( |
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113 | "no record data parsers registered"); |
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114 | } |
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115 | this.parsers = new HashMap<String, SRURecordDataParser>(); |
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116 | for (SRURecordDataParser parser : list) { |
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117 | final String recordSchema = parser.getRecordSchema(); |
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118 | if (!parsers.containsKey(recordSchema)) { |
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119 | parsers.put(recordSchema, parser); |
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120 | } else { |
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121 | throw new IllegalArgumentException( |
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122 | "record data parser already registered: " + |
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123 | recordSchema); |
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124 | } |
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125 | } |
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126 | |
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127 | final CloseableHttpClient client = config.getCustomizedHttpClient(); |
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128 | if (client != null) { |
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129 | // use customized http client |
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130 | this.httpClient = client; |
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131 | this.httpContext = config.getHttpClientContext(); |
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132 | } else { |
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133 | // create HTTP client |
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134 | httpClient = createHttpClient(config.getConnectTimeout(), |
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135 | config.getSocketTimeout()); |
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136 | httpContext = null; |
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137 | } |
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138 | } |
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139 | |
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140 | |
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141 | /** |
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142 | * Perform a <em>explain</em> operation. |
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143 | * |
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144 | * @param request |
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145 | * an instance of a {@link SRUExplainRequest} object |
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146 | * @param handler |
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147 | * an instance of {@link SRUExplainHandler} to receive callbacks |
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148 | * when processing the result of this request |
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149 | * @throws SRUClientException |
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150 | * if an unrecoverable error occurred |
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151 | * @throws NullPointerException |
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152 | * if any required argument is <code>null</code> |
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153 | * @see SRUExplainRequest |
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154 | * @see SRUExplainHandler |
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155 | */ |
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156 | public void explain(SRUExplainRequest request, SRUExplainHandler handler) |
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157 | throws SRUClientException { |
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158 | if (request == null) { |
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159 | throw new NullPointerException("request == null"); |
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160 | } |
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161 | if (handler == null) { |
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162 | throw new NullPointerException("handler == null"); |
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163 | } |
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164 | logger.debug("performing explain request"); |
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165 | |
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166 | final long ts_start = System.nanoTime(); |
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167 | |
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168 | // create URI and perform request |
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169 | final URI uri = request.makeURI(defaultVersion); |
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170 | CloseableHttpResponse response = executeRequest(uri); |
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171 | InputStream stream = null; |
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172 | SRUXMLStreamReader reader = null; |
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173 | try { |
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174 | final HttpEntity entity = response.getEntity(); |
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175 | if (entity == null) { |
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176 | throw new SRUClientException("cannot get entity"); |
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177 | } |
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178 | |
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179 | stream = entity.getContent(); |
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180 | |
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181 | final long ts_parsing = System.nanoTime(); |
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182 | reader = createReader(stream, true); |
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183 | parseExplainResponse(reader, request, handler); |
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184 | final long ts_end = System.nanoTime(); |
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185 | |
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186 | final long millisTotal = |
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187 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_start); |
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188 | final long millisNetwork = |
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189 | TimeUnit.NANOSECONDS.toMillis(ts_parsing - ts_start); |
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190 | final long millisProcessing = |
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191 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_parsing); |
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192 | logger.debug("{} byte(s) in {} milli(s) " + |
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193 | "({} milli(s) network / {} milli(s) processing)", |
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194 | reader.getByteCount(), millisTotal, millisNetwork, |
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195 | millisProcessing); |
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196 | handler.onRequestStatistics((int) reader.getByteCount(), |
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197 | millisTotal, millisNetwork, millisProcessing); |
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198 | } catch (IllegalStateException e) { |
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199 | throw new SRUClientException("error reading response", e); |
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200 | } catch (IOException e) { |
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201 | throw new SRUClientException("error reading response", e); |
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202 | } catch (XMLStreamException e) { |
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203 | throw new SRUClientException("error reading response", e); |
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204 | } finally { |
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205 | if (reader != null) { |
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206 | try { |
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207 | reader.close(); |
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208 | } catch (XMLStreamException e) { |
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209 | /* IGNORE */ |
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210 | } |
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211 | } |
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212 | if (stream != null) { |
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213 | try { |
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214 | stream.close(); |
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215 | } catch (IOException e) { |
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216 | /* IGNORE */ |
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217 | } |
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218 | } |
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219 | |
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220 | /* make sure to release allocated resources */ |
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221 | try { |
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222 | response.close(); |
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223 | } catch (IOException e) { |
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224 | /* IGNORE */ |
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225 | } |
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226 | } |
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227 | } |
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228 | |
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229 | |
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230 | /** |
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231 | * Perform a <em>scan</em> operation. |
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232 | * |
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233 | * @param request |
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234 | * an instance of a {@link SRUScanRequest} object |
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235 | * @param handler |
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236 | * an instance of {@link SRUScanHandler} to receive callbacks |
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237 | * when processing the result of this request |
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238 | * @throws SRUClientException |
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239 | * if an unrecoverable error occurred |
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240 | * @throws NullPointerException |
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241 | * if any required argument is <code>null</code> |
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242 | * @see SRUScanRequest |
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243 | * @see SRUScanHandler |
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244 | */ |
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245 | public void scan(SRUScanRequest request, SRUScanHandler handler) |
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246 | throws SRUClientException { |
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247 | if (request == null) { |
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248 | throw new NullPointerException("request == null"); |
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249 | } |
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250 | if (handler == null) { |
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251 | throw new NullPointerException("handler == null"); |
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252 | } |
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253 | logger.debug("performing scan request: scanClause = {}", |
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254 | request.getScanClause()); |
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255 | |
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256 | final long ts_start = System.nanoTime(); |
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257 | |
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258 | // create URI and perform request |
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259 | final URI uri = request.makeURI(defaultVersion); |
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260 | CloseableHttpResponse response = executeRequest(uri); |
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261 | InputStream stream = null; |
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262 | SRUXMLStreamReader reader = null; |
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263 | try { |
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264 | final HttpEntity entity = response.getEntity(); |
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265 | if (entity == null) { |
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266 | throw new SRUClientException("cannot get entity"); |
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267 | } |
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268 | stream = entity.getContent(); |
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269 | |
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270 | final long ts_parsing = System.nanoTime(); |
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271 | reader = createReader(stream, true); |
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272 | parseScanResponse(reader, request, handler); |
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273 | final long ts_end = System.nanoTime(); |
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274 | |
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275 | final long millisTotal = |
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276 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_start); |
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277 | final long millisNetwork = |
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278 | TimeUnit.NANOSECONDS.toMillis(ts_parsing - ts_start); |
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279 | final long millisProcessing = |
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280 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_parsing); |
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281 | logger.debug("{} byte(s) in {} milli(s) " + |
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282 | "({} milli(s) network / {} milli(s) processing)", |
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283 | reader.getByteCount(), millisTotal, millisNetwork, |
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284 | millisProcessing); |
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285 | handler.onRequestStatistics((int) reader.getByteCount(), |
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286 | millisTotal, millisNetwork, millisProcessing); |
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287 | } catch (IllegalStateException e) { |
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288 | throw new SRUClientException("error reading response", e); |
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289 | } catch (IOException e) { |
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290 | throw new SRUClientException("error reading response", e); |
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291 | } catch (XMLStreamException e) { |
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292 | throw new SRUClientException("error reading response", e); |
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293 | } finally { |
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294 | if (reader != null) { |
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295 | try { |
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296 | reader.close(); |
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297 | } catch (XMLStreamException e) { |
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298 | /* IGNORE */ |
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299 | } |
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300 | } |
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301 | if (stream != null) { |
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302 | try { |
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303 | stream.close(); |
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304 | } catch (IOException e) { |
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305 | /* IGNORE */ |
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306 | } |
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307 | } |
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308 | |
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309 | /* make sure to release allocated resources */ |
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310 | try { |
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311 | response.close(); |
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312 | } catch (IOException e) { |
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313 | /* IGNORE */ |
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314 | } |
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315 | } |
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316 | } |
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317 | |
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318 | |
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319 | /** |
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320 | * Perform a <em>searchRetrieve</em> operation. |
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321 | * |
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322 | * @param request |
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323 | * an instance of a {@link SRUSearchRetrieveRequest} object |
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324 | * @param handler |
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325 | * an instance of {@link SRUSearchRetrieveHandler} to receive |
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326 | * callbacks when processing the result of this request |
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327 | * @throws SRUClientException |
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328 | * if an unrecoverable error occurred |
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329 | * @throws NullPointerException |
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330 | * if any required argument is <code>null</code> |
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331 | * @see SRUSearchRetrieveRequest |
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332 | * @see SRUSearchRetrieveHandler |
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333 | */ |
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334 | public void searchRetrieve(SRUSearchRetrieveRequest request, |
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335 | SRUSearchRetrieveHandler handler) throws SRUClientException { |
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336 | if (request == null) { |
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337 | throw new NullPointerException("request == null"); |
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338 | } |
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339 | if (handler == null) { |
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340 | throw new NullPointerException("handler == null"); |
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341 | } |
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342 | logger.debug("performing searchRetrieve request: query = {}", |
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343 | request.getQuery()); |
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344 | |
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345 | final long ts_start = System.nanoTime(); |
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346 | |
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347 | // create URI and perform request |
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348 | final URI uri = request.makeURI(defaultVersion); |
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349 | CloseableHttpResponse response = executeRequest(uri); |
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350 | InputStream stream = null; |
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351 | SRUXMLStreamReader reader = null; |
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352 | try { |
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353 | final HttpEntity entity = response.getEntity(); |
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354 | if (entity == null) { |
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355 | throw new SRUClientException("cannot get entity"); |
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356 | } |
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357 | |
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358 | stream = entity.getContent(); |
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359 | |
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360 | final long ts_parsing = System.nanoTime(); |
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361 | reader = createReader(stream, true); |
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362 | parseSearchRetrieveResponse(reader, request, handler); |
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363 | final long ts_end = System.nanoTime(); |
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364 | |
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365 | final long millisTotal = |
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366 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_start); |
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367 | final long millisNetwork = |
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368 | TimeUnit.NANOSECONDS.toMillis(ts_parsing - ts_start); |
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369 | final long millisProcessing = |
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370 | TimeUnit.NANOSECONDS.toMillis(ts_end - ts_parsing); |
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371 | logger.debug("{} byte(s) in {} milli(s) " + |
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372 | "({} milli(s) network / {} milli(s) processing)", |
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373 | reader.getByteCount(), millisTotal, millisNetwork, |
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374 | millisProcessing); |
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375 | handler.onRequestStatistics((int) reader.getByteCount(), |
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376 | millisTotal, millisNetwork, millisProcessing); |
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377 | } catch (IllegalStateException e) { |
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378 | throw new SRUClientException("error reading response", e); |
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379 | } catch (IOException e) { |
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380 | throw new SRUClientException("error reading response", e); |
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381 | } catch (XMLStreamException e) { |
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382 | throw new SRUClientException("error reading response", e); |
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383 | } finally { |
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384 | if (reader != null) { |
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385 | try { |
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386 | reader.close(); |
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387 | } catch (XMLStreamException e) { |
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388 | /* IGNORE */ |
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389 | } |
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390 | } |
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391 | if (stream != null) { |
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392 | try { |
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393 | stream.close(); |
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394 | } catch (IOException e) { |
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395 | /* IGNORE */ |
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396 | } |
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397 | } |
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398 | |
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399 | /* make sure to release allocated resources */ |
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400 | try { |
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401 | response.close(); |
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402 | } catch (IOException e) { |
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403 | /* IGNORE */ |
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404 | } |
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405 | } |
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406 | } |
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407 | |
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408 | |
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409 | private CloseableHttpResponse executeRequest(URI uri) |
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410 | throws SRUClientException { |
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411 | CloseableHttpResponse response = null; |
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412 | boolean forceClose = true; |
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413 | try { |
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414 | logger.debug("submitting HTTP request: {}", uri.toString()); |
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415 | try { |
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416 | HttpGet request = new HttpGet(uri); |
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417 | response = httpClient.execute(request, httpContext); |
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418 | StatusLine status = response.getStatusLine(); |
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419 | if (status.getStatusCode() != HttpStatus.SC_OK) { |
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420 | if (status.getStatusCode() == HttpStatus.SC_NOT_FOUND) { |
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421 | throw new SRUClientException("not found: " + uri); |
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422 | } else { |
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423 | throw new SRUClientException("unexpected status: " + |
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424 | status.getStatusCode()); |
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425 | } |
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426 | } |
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427 | forceClose = false; |
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428 | return response; |
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429 | } catch (ClientProtocolException e) { |
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430 | throw new SRUClientException("client protocol exception", e); |
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431 | } catch (UnknownHostException e) { |
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432 | throw new SRUClientException( |
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433 | "unknown host: " + uri.getHost(), e); |
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434 | } catch (IOException e) { |
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435 | String msg = null; |
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436 | if ((e.getMessage() != null) && !e.getMessage().isEmpty()) { |
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437 | msg = e.getMessage(); |
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438 | } |
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439 | throw new SRUClientException(msg != null |
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440 | ? msg |
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441 | : "input/output error", e); |
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442 | } |
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443 | } catch (SRUClientException e) { |
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444 | /* |
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445 | * if an error occurred, make sure we are freeing up the resources |
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446 | * we've used |
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447 | */ |
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448 | if (forceClose && (response != null)) { |
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449 | try { |
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450 | response.close(); |
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451 | } catch (IOException ex) { |
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452 | /* IGNORE */ |
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453 | } |
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454 | } |
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455 | throw e; |
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456 | } |
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457 | } |
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458 | |
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459 | |
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460 | private void parseExplainResponse(final SRUXMLStreamReader reader, |
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461 | final SRUExplainRequest request, final SRUExplainHandler handler) |
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462 | throws SRUClientException { |
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463 | logger.debug("parsing 'explain' response (mode = {})", |
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464 | (request.isStrictMode() ? "strict" : "non-strict")); |
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465 | |
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466 | /* detect response namespaces */ |
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467 | final SRUNamespaces ns = |
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468 | detectNamespace(reader, request.getRequestedVersion()); |
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469 | |
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470 | /* |
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471 | * Eventually, SRUClient should always parse explain record data. |
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472 | * However, for now, make caller explicitly ask for it. |
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473 | */ |
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474 | final boolean parse = request.isParseRecordDataEnabled(); |
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475 | if (!parse) { |
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476 | logger.debug("parsing of explain record data skipped"); |
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477 | } |
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478 | doParseExplainResponse(reader, ns, request, handler, parse); |
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479 | } |
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480 | |
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481 | |
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482 | private void doParseExplainResponse(SRUXMLStreamReader reader, |
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483 | SRUNamespaces ns, SRUAbstractRequest request, |
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484 | SRUExplainHandler handler, boolean parseRecordData) |
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485 | throws SRUClientException { |
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486 | try { |
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487 | final boolean strictMode = request.isStrictMode(); |
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488 | |
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489 | // explainResponse |
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490 | reader.readStart(ns.sruNS(), "explainResponse", true); |
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491 | |
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492 | // explainResponse/version |
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493 | final SRUVersion version = parseVersion(reader, ns.sruNS()); |
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494 | logger.debug("version = {}, requested = {}", version, |
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495 | request.getRequestedVersion()); |
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496 | |
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497 | // explainResponse/record |
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498 | reader.readStart(ns.sruNS(), "record", true); |
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499 | if (parseRecordData) { |
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500 | handler.onStartRecords(-1, null, -1); |
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501 | |
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502 | /* |
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503 | * common error: recordEscaping / recordPacking (SRU 1.2) in |
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504 | * wrong order |
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505 | */ |
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506 | SRURecordXmlEscaping recordXmlEscaping = null; |
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507 | if (!strictMode && reader.peekStart(ns.sruNS(), "recordPacking")) { |
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508 | recordXmlEscaping = parseRecordXmlEscaping(reader, ns, |
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509 | request.getRequestedVersion(), false); |
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510 | if (recordXmlEscaping != null) { |
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511 | logger.error("element <recordPacking> must apperear " + |
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512 | "after element <recordSchema> within " + |
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513 | "element <record>"); |
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514 | } |
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515 | } |
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516 | |
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517 | String schema = |
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518 | reader.readContent(ns.sruNS(), "recordSchema", true); |
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519 | |
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520 | // (SRU 2.0) recordPacking (optional) |
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521 | // XXX: what to do with it? |
---|
522 | SRURecordPacking recordPacking = null; |
---|
523 | if (version.isVersion(SRUVersion.VERSION_2_0)) { |
---|
524 | recordPacking = parseRecordPacking(reader, |
---|
525 | ns.sruNS(), strictMode); |
---|
526 | } |
---|
527 | |
---|
528 | // recordXmlEscaping (used to be recordPacking in SRU 1.0/1.2) |
---|
529 | if (recordXmlEscaping == null) { |
---|
530 | recordXmlEscaping = parseRecordXmlEscaping(reader, ns, |
---|
531 | request.getRequestedVersion(), strictMode); |
---|
532 | } |
---|
533 | logger.debug("schema = {}, escaping = {}, packing = {}", |
---|
534 | schema, recordXmlEscaping, recordPacking); |
---|
535 | |
---|
536 | // explainResponse/record/recordData |
---|
537 | reader.readStart(ns.sruNS(), "recordData", true); |
---|
538 | reader.consumeWhitespace(); |
---|
539 | |
---|
540 | SRURecordData recordData = null; |
---|
541 | SRUXMLStreamReader recordReader = null; |
---|
542 | |
---|
543 | if (recordXmlEscaping == SRURecordXmlEscaping.STRING) { |
---|
544 | /* |
---|
545 | * read content into temporary buffer and then use a new XML |
---|
546 | * reader to parse record data |
---|
547 | */ |
---|
548 | final String data = reader.readString(true); |
---|
549 | InputStream in = new ByteArrayInputStream(data.getBytes()); |
---|
550 | // FIXME: namespace context? |
---|
551 | recordReader = createReader(in, false); |
---|
552 | } else { |
---|
553 | recordReader = reader; |
---|
554 | } |
---|
555 | |
---|
556 | try { |
---|
557 | proxy.reset(recordReader); |
---|
558 | /* |
---|
559 | * Try to parse explain record data with explain record |
---|
560 | * parser. It will throw an exception, if it cannot handle |
---|
561 | * the data. |
---|
562 | */ |
---|
563 | recordData = explainRecordParser.parse(proxy, |
---|
564 | version, strictMode, schema); |
---|
565 | } catch (XMLStreamException e) { |
---|
566 | throw new SRUClientException( |
---|
567 | "error parsing explain record", e); |
---|
568 | } finally { |
---|
569 | /* |
---|
570 | * make sure, we're deallocate the record reader in case of |
---|
571 | * string record packing |
---|
572 | */ |
---|
573 | if (recordXmlEscaping == SRURecordXmlEscaping.STRING) { |
---|
574 | recordReader.closeCompletly(); |
---|
575 | } |
---|
576 | } |
---|
577 | if (recordData == null) { |
---|
578 | throw new SRUClientException("no record data could " + |
---|
579 | "be extracted from the response"); |
---|
580 | } |
---|
581 | reader.consumeWhitespace(); |
---|
582 | reader.readEnd(ns.sruNS(), "recordData", true); |
---|
583 | |
---|
584 | if (version.isVersion(SRUVersion.VERSION_1_2, |
---|
585 | SRUVersion.VERSION_2_0)) { |
---|
586 | reader.readContent(ns.sruNS(), "recordIdentifier", false); |
---|
587 | } |
---|
588 | reader.readContent(ns.sruNS(), "recordPosition", false, -1); |
---|
589 | |
---|
590 | // notify handler |
---|
591 | handler.onRecord(null, -1, recordData); |
---|
592 | |
---|
593 | if (reader.readStart(ns.sruNS(), "extraRecordData", false)) { |
---|
594 | reader.consumeWhitespace(); |
---|
595 | proxy.reset(reader); |
---|
596 | try { |
---|
597 | logger.debug("parsing extra response data"); |
---|
598 | handler.onExtraRecordData(null, -1, proxy); |
---|
599 | } catch (XMLStreamException e) { |
---|
600 | throw new SRUClientException("handler " |
---|
601 | + "triggered error while parsing " |
---|
602 | + "'extraRecordData'", e); |
---|
603 | } |
---|
604 | reader.consumeWhitespace(); |
---|
605 | reader.readEnd(ns.sruNS(), "extraRecordData", true); |
---|
606 | } |
---|
607 | |
---|
608 | handler.onFinishRecords(-1); |
---|
609 | |
---|
610 | reader.readEnd(ns.sruNS(), "record"); |
---|
611 | } else { |
---|
612 | /* |
---|
613 | * do not really parse record and skip everything |
---|
614 | * until <record> end tag |
---|
615 | */ |
---|
616 | reader.readEnd(ns.sruNS(), "record", true); |
---|
617 | } |
---|
618 | |
---|
619 | // explainResponse/echoedExplainRequest |
---|
620 | if (reader.readStart(ns.sruNS(), "echoedExplainRequest", false)) { |
---|
621 | reader.readEnd(ns.sruNS(), "echoedExplainRequest", true); |
---|
622 | } |
---|
623 | |
---|
624 | /* |
---|
625 | * common error: echoedExplainRequest in default namespace |
---|
626 | */ |
---|
627 | if (reader.readStart("", "echoedExplainRequest", false)) { |
---|
628 | logger.error("Element 'echoedExplainRequest' must be in SRU " + |
---|
629 | "namespace, but endpoint put it into default namespace"); |
---|
630 | if (strictMode) { |
---|
631 | throw new SRUClientException("Element " + |
---|
632 | "'echoedExplainRequest' must be in SRU namespace,"+ |
---|
633 | " but endpoint put it into default namespace"); |
---|
634 | } |
---|
635 | reader.readEnd("", "echoedExplainRequest", true); |
---|
636 | } |
---|
637 | |
---|
638 | // explainResponse/diagnostics |
---|
639 | final List<SRUDiagnostic> diagnostics = |
---|
640 | parseDiagnostics(reader, ns, ns.scanNS(), strictMode); |
---|
641 | if (diagnostics != null) { |
---|
642 | handler.onDiagnostics(diagnostics); |
---|
643 | } |
---|
644 | |
---|
645 | // explainResponse/extraResponseData |
---|
646 | if (reader.readStart(ns.sruNS(), "extraResponseData", false)) { |
---|
647 | reader.consumeWhitespace(); |
---|
648 | proxy.reset(reader); |
---|
649 | try { |
---|
650 | logger.debug("parsing extra response data"); |
---|
651 | handler.onExtraResponseData(proxy); |
---|
652 | } catch (XMLStreamException e) { |
---|
653 | throw new SRUClientException("handler triggered " |
---|
654 | + "error while parsing 'extraResponseData'", e); |
---|
655 | } |
---|
656 | reader.consumeWhitespace(); |
---|
657 | reader.readEnd(ns.sruNS(), "extraResponseData", true); |
---|
658 | } |
---|
659 | |
---|
660 | reader.readEnd(ns.sruNS(), "explainResponse"); |
---|
661 | } catch (XMLStreamException e) { |
---|
662 | throw new SRUClientException(e.getMessage(), e); |
---|
663 | } |
---|
664 | } |
---|
665 | |
---|
666 | |
---|
667 | private void parseScanResponse(final SRUXMLStreamReader reader, |
---|
668 | final SRUScanRequest request, final SRUScanHandler handler) |
---|
669 | throws SRUClientException { |
---|
670 | try { |
---|
671 | /* detect response namespaces */ |
---|
672 | final SRUNamespaces ns = |
---|
673 | detectNamespace(reader, request.getRequestedVersion()); |
---|
674 | |
---|
675 | /* |
---|
676 | * if the endpoint cannot determine the operation, it should create |
---|
677 | * a explain response. |
---|
678 | */ |
---|
679 | if (reader.peekStart(ns.sruNS(), "explainResponse")) { |
---|
680 | doParseExplainResponse(reader, ns, request, new SRUExplainHandler() { |
---|
681 | @Override |
---|
682 | public void onRequestStatistics(int bytes, long millisTotal, |
---|
683 | long millisNetwork, long millisParsing) { |
---|
684 | } |
---|
685 | |
---|
686 | |
---|
687 | @Override |
---|
688 | public void onExtraResponseData(XMLStreamReader reader) |
---|
689 | throws XMLStreamException, SRUClientException { |
---|
690 | } |
---|
691 | |
---|
692 | |
---|
693 | @Override |
---|
694 | public void onDiagnostics(List<SRUDiagnostic> diagnostics) |
---|
695 | throws SRUClientException { |
---|
696 | handler.onDiagnostics(diagnostics); |
---|
697 | } |
---|
698 | |
---|
699 | |
---|
700 | @Override |
---|
701 | public void onStartRecords(int numberOfRecords, |
---|
702 | String resultSetId, int resultSetIdleTime) |
---|
703 | throws SRUClientException { |
---|
704 | } |
---|
705 | |
---|
706 | |
---|
707 | @Override |
---|
708 | public void onFinishRecords(int nextRecordPosition) |
---|
709 | throws SRUClientException { |
---|
710 | } |
---|
711 | |
---|
712 | |
---|
713 | @Override |
---|
714 | public void onRecord(String identifier, int position, |
---|
715 | SRURecordData data) throws SRUClientException { |
---|
716 | } |
---|
717 | |
---|
718 | |
---|
719 | @Override |
---|
720 | public void onExtraRecordData(String identifier, |
---|
721 | int position, XMLStreamReader reader) |
---|
722 | throws XMLStreamException, SRUClientException { |
---|
723 | } |
---|
724 | }, false); |
---|
725 | } else { |
---|
726 | final boolean strictMode = request.isStrictMode(); |
---|
727 | |
---|
728 | logger.debug("parsing 'scan' response (mode = {})", |
---|
729 | (strictMode ? "strict" : "non-strict")); |
---|
730 | |
---|
731 | // scanResponse |
---|
732 | reader.readStart(ns.scanNS(), "scanResponse", true); |
---|
733 | |
---|
734 | // scanResponse/version |
---|
735 | final SRUVersion version = parseVersion(reader, ns.scanNS()); |
---|
736 | logger.debug("version = {}, requested = {}", version, |
---|
737 | request.getRequestedVersion()); |
---|
738 | |
---|
739 | // scanResponse/terms |
---|
740 | if (reader.readStart(ns.scanNS(), "terms", false)) { |
---|
741 | boolean first = true; |
---|
742 | while (reader.readStart(ns.scanNS(), "term", first)) { |
---|
743 | if (first) { |
---|
744 | first = false; |
---|
745 | handler.onStartTerms(); |
---|
746 | } |
---|
747 | |
---|
748 | // scanResponse/terms/value |
---|
749 | String value = |
---|
750 | reader.readContent(ns.scanNS(), "value", true); |
---|
751 | |
---|
752 | // scanResponse/terms/numberOfRecords |
---|
753 | int numberOfRecords = reader.readContent(ns.scanNS(), |
---|
754 | "numberOfRecords", false, -1); |
---|
755 | |
---|
756 | // scanResponse/terms/displayTerm |
---|
757 | String displayTerm = reader.readContent(ns.scanNS(), |
---|
758 | "displayTerm", false); |
---|
759 | |
---|
760 | // scanResponse/terms/whereInList |
---|
761 | String s = reader.readContent(ns.scanNS(), |
---|
762 | "whereInList", false); |
---|
763 | SRUWhereInList whereInList = null; |
---|
764 | if (s != null) { |
---|
765 | if ("first".equals(s)) { |
---|
766 | whereInList = SRUWhereInList.FIRST; |
---|
767 | } else if ("last".equals(s)) { |
---|
768 | whereInList = SRUWhereInList.LAST; |
---|
769 | } else if ("only".equals(s)) { |
---|
770 | whereInList = SRUWhereInList.ONLY; |
---|
771 | } else if ("inner".equals(s)) { |
---|
772 | whereInList = SRUWhereInList.INNER; |
---|
773 | } else { |
---|
774 | throw new SRUClientException( |
---|
775 | "invalid value for 'whereInList': " + s); |
---|
776 | } |
---|
777 | } |
---|
778 | logger.debug("value = {}, numberOfRecords = {}, " + |
---|
779 | "displayTerm = {}, whereInList = {}", value, |
---|
780 | numberOfRecords, displayTerm, whereInList); |
---|
781 | handler.onTerm(value, numberOfRecords, displayTerm, |
---|
782 | whereInList); |
---|
783 | |
---|
784 | // scanResponse/terms/extraTermData |
---|
785 | if (reader.readStart(ns.scanNS(), "extraTermData", first)) { |
---|
786 | reader.consumeWhitespace(); |
---|
787 | proxy.reset(reader); |
---|
788 | try { |
---|
789 | handler.onExtraTermData(value, proxy); |
---|
790 | } catch (XMLStreamException e) { |
---|
791 | throw new SRUClientException("handler " |
---|
792 | + "triggered error while parsing " |
---|
793 | + "'extraTermData'", e); |
---|
794 | } |
---|
795 | reader.consumeWhitespace(); |
---|
796 | reader.readEnd(ns.scanNS(), "extraTermData", true); |
---|
797 | } |
---|
798 | reader.readEnd(ns.scanNS(), "term", true); |
---|
799 | |
---|
800 | } // while |
---|
801 | reader.readEnd(ns.scanNS(), "terms"); |
---|
802 | handler.onFinishTerms(); |
---|
803 | } |
---|
804 | |
---|
805 | // scanResponse/echoedScanRequest |
---|
806 | if (reader.readStart(ns.scanNS(), "echoedScanRequest", false)) { |
---|
807 | reader.readEnd(ns.scanNS(), "echoedScanRequest", true); |
---|
808 | } |
---|
809 | |
---|
810 | /* |
---|
811 | * common error: echoedScanRequest in default namespace |
---|
812 | */ |
---|
813 | if (reader.readStart("", "echoedScanRequest", false)) { |
---|
814 | logger.error("Element 'echoedScanRequest' must be in SRU namespace, but endpoint put it into default namespace"); |
---|
815 | if (strictMode) { |
---|
816 | throw new SRUClientException("Element 'echoedScanRequest' must be in SRU namespace, but endpoint put it into default namespace"); |
---|
817 | } |
---|
818 | reader.readEnd("", "echoedScanRequest", true); |
---|
819 | } |
---|
820 | |
---|
821 | // scanResponse/diagnostics |
---|
822 | final List<SRUDiagnostic> diagnostics = |
---|
823 | parseDiagnostics(reader, ns, ns.scanNS(), strictMode); |
---|
824 | if (diagnostics != null) { |
---|
825 | handler.onDiagnostics(diagnostics); |
---|
826 | } |
---|
827 | |
---|
828 | // scanResponse/extraResponseData |
---|
829 | if (reader.readStart(ns.scanNS(), "extraResponseData", false)) { |
---|
830 | reader.consumeWhitespace(); |
---|
831 | proxy.reset(reader); |
---|
832 | try { |
---|
833 | logger.debug("parsing extra response data"); |
---|
834 | handler.onExtraResponseData(proxy); |
---|
835 | } catch (XMLStreamException e) { |
---|
836 | throw new SRUClientException("handler triggered " |
---|
837 | + "error while parsing 'extraResponseData'", e); |
---|
838 | } |
---|
839 | reader.consumeWhitespace(); |
---|
840 | reader.readEnd(ns.scanNS(), "extraResponseData", true); |
---|
841 | } |
---|
842 | |
---|
843 | reader.readEnd(ns.scanNS(), "scanResponse"); |
---|
844 | } |
---|
845 | } catch (XMLStreamException e) { |
---|
846 | throw new SRUClientException(e.getMessage(), e); |
---|
847 | } |
---|
848 | } |
---|
849 | |
---|
850 | |
---|
851 | private void parseSearchRetrieveResponse(final SRUXMLStreamReader reader, |
---|
852 | final SRUSearchRetrieveRequest request, |
---|
853 | final SRUSearchRetrieveHandler handler) throws SRUClientException { |
---|
854 | try { |
---|
855 | /* detect response namespaces */ |
---|
856 | final SRUNamespaces ns = |
---|
857 | detectNamespace(reader, request.getRequestedVersion()); |
---|
858 | |
---|
859 | /* |
---|
860 | * if the endpoint cannot determine the operation, it should create |
---|
861 | * a explain response. |
---|
862 | */ |
---|
863 | if (reader.peekStart(ns.sruNS(), "explainResponse")) { |
---|
864 | doParseExplainResponse(reader, ns, request, new SRUExplainHandler() { |
---|
865 | @Override |
---|
866 | public void onRequestStatistics(int bytes, long millisTotal, |
---|
867 | long millisNetwork, long millisParsing) { |
---|
868 | } |
---|
869 | |
---|
870 | |
---|
871 | @Override |
---|
872 | public void onExtraResponseData(XMLStreamReader reader) |
---|
873 | throws XMLStreamException, SRUClientException { |
---|
874 | } |
---|
875 | |
---|
876 | |
---|
877 | @Override |
---|
878 | public void onDiagnostics(List<SRUDiagnostic> diagnostics) |
---|
879 | throws SRUClientException { |
---|
880 | handler.onDiagnostics(diagnostics); |
---|
881 | } |
---|
882 | |
---|
883 | |
---|
884 | @Override |
---|
885 | public void onStartRecords(int numberOfRecords, |
---|
886 | String resultSetId, int resultSetIdleTime) |
---|
887 | throws SRUClientException { |
---|
888 | } |
---|
889 | |
---|
890 | |
---|
891 | @Override |
---|
892 | public void onFinishRecords(int nextRecordPosition) |
---|
893 | throws SRUClientException { |
---|
894 | } |
---|
895 | |
---|
896 | |
---|
897 | @Override |
---|
898 | public void onRecord(String identifier, int position, |
---|
899 | SRURecordData data) throws SRUClientException { |
---|
900 | } |
---|
901 | |
---|
902 | |
---|
903 | @Override |
---|
904 | public void onExtraRecordData(String identifier, |
---|
905 | int position, XMLStreamReader reader) |
---|
906 | throws XMLStreamException, SRUClientException { |
---|
907 | } |
---|
908 | }, false); |
---|
909 | } else { |
---|
910 | final boolean strictMode = request.isStrictMode(); |
---|
911 | |
---|
912 | logger.debug("parsing 'searchRetrieve' response (mode = {})", |
---|
913 | (strictMode ? "strict" : "non-strict")); |
---|
914 | |
---|
915 | // searchRetrieveResponse |
---|
916 | reader.readStart(ns.sruNS(), "searchRetrieveResponse", true); |
---|
917 | |
---|
918 | // searchRetrieveResponse/version |
---|
919 | final SRUVersion version = parseVersion(reader, ns.sruNS()); |
---|
920 | logger.debug("version = {}, requested = {}", version, |
---|
921 | request.getRequestedVersion()); |
---|
922 | |
---|
923 | // searchRetrieveResponse/numberOfRecords |
---|
924 | int numberOfRecords = reader.readContent(ns.sruNS(), |
---|
925 | "numberOfRecords", true, -1); |
---|
926 | |
---|
927 | // searchRetrieveResponse/resultSetId |
---|
928 | String resultSetId = reader.readContent(ns.sruNS(), |
---|
929 | "resultSetId", false); |
---|
930 | |
---|
931 | // searchRetrieveResponse/resultSetIdleTime |
---|
932 | int resultSetIdleTime = reader.readContent(ns.sruNS(), |
---|
933 | "resultSetIdleTime", false, -1); |
---|
934 | |
---|
935 | logger.debug("numberOfRecords = {}, resultSetId = {}, " + |
---|
936 | "resultSetIdleTime = {}", numberOfRecords, |
---|
937 | resultSetId, resultSetIdleTime); |
---|
938 | |
---|
939 | // searchRetrieveResponse/results |
---|
940 | if (numberOfRecords > 0) { |
---|
941 | /* |
---|
942 | * some endpoints set numberOfRecords but do not serialize |
---|
943 | * any records, e.g if requested record schema is not |
---|
944 | * supported |
---|
945 | */ |
---|
946 | int recordCount = 0; |
---|
947 | if (reader.readStart(ns.sruNS(), "records", false)) { |
---|
948 | // searchRetrieveResponse/records/record |
---|
949 | boolean first = true; |
---|
950 | while (reader.readStart(ns.sruNS(), "record", first)) { |
---|
951 | if (first) { |
---|
952 | first = false; |
---|
953 | handler.onStartRecords(numberOfRecords, |
---|
954 | resultSetId, resultSetIdleTime); |
---|
955 | } |
---|
956 | |
---|
957 | /* |
---|
958 | * common error: recordEscaping / recordPacking |
---|
959 | * (SRU 1.2) in wrong order |
---|
960 | */ |
---|
961 | SRURecordXmlEscaping recordXmlEscaping = null; |
---|
962 | if (!strictMode && |
---|
963 | reader.peekStart(ns.sruNS(), "recordPacking")) { |
---|
964 | recordXmlEscaping = |
---|
965 | parseRecordXmlEscaping(reader, ns, |
---|
966 | version, false); |
---|
967 | if (recordXmlEscaping != null) { |
---|
968 | logger.error("element <recordPacking> " + |
---|
969 | "must appear after element " + |
---|
970 | "<recordSchema> within " + |
---|
971 | "element <record>"); |
---|
972 | } |
---|
973 | } |
---|
974 | |
---|
975 | String schema = reader.readContent(ns.sruNS(), |
---|
976 | "recordSchema", true); |
---|
977 | |
---|
978 | // (SRU 2.0) recordPacking (optional) |
---|
979 | // XXX: what to do with it? |
---|
980 | SRURecordPacking recordPacking = null; |
---|
981 | if (version.isVersion(SRUVersion.VERSION_2_0)) { |
---|
982 | recordPacking = parseRecordPacking(reader, |
---|
983 | ns.sruNS(), strictMode); |
---|
984 | } |
---|
985 | |
---|
986 | if (recordXmlEscaping == null) { |
---|
987 | recordXmlEscaping = |
---|
988 | parseRecordXmlEscaping(reader, ns, |
---|
989 | version, strictMode); |
---|
990 | } |
---|
991 | |
---|
992 | logger.debug("schema = {}, escaping = {}, " + |
---|
993 | "packing = {}, requested escaping = {}, " + |
---|
994 | "requested packing = {}", |
---|
995 | schema, recordXmlEscaping, recordPacking, |
---|
996 | request.getRecordXmlEscaping(), |
---|
997 | request.getRecordPacking()); |
---|
998 | |
---|
999 | if ((request.getRecordXmlEscaping() != null) && |
---|
1000 | (recordXmlEscaping != request.getRecordXmlEscaping())) { |
---|
1001 | final SRURecordXmlEscaping p = |
---|
1002 | request.getRecordXmlEscaping(); |
---|
1003 | logger.error("requested '{}' record XML escaping, " + |
---|
1004 | "but server responded with '{}' " + |
---|
1005 | "record XML escaping", |
---|
1006 | p.getStringValue(), |
---|
1007 | recordXmlEscaping.getStringValue()); |
---|
1008 | if (strictMode) { |
---|
1009 | throw new SRUClientException("requested '" + |
---|
1010 | p.getStringValue() + |
---|
1011 | "' record packing, but server " + |
---|
1012 | "responded with '" + |
---|
1013 | recordXmlEscaping.getStringValue() + |
---|
1014 | "' record packing"); |
---|
1015 | } |
---|
1016 | } |
---|
1017 | |
---|
1018 | // searchRetrieveResponse/record/recordData |
---|
1019 | reader.readStart(ns.sruNS(), "recordData", true); |
---|
1020 | reader.consumeWhitespace(); |
---|
1021 | |
---|
1022 | SRURecordData recordData = null; |
---|
1023 | SRUDiagnostic surrogate = null; |
---|
1024 | SRUXMLStreamReader recordReader = null; |
---|
1025 | |
---|
1026 | if (recordXmlEscaping == SRURecordXmlEscaping.STRING) { |
---|
1027 | /* |
---|
1028 | * read content into temporary buffer and then |
---|
1029 | * use a new XML reader to parse record data |
---|
1030 | */ |
---|
1031 | final String data = reader.readString(true); |
---|
1032 | InputStream in = new ByteArrayInputStream( |
---|
1033 | data.getBytes()); |
---|
1034 | // FIXME: namespace context? |
---|
1035 | recordReader = createReader(in, false); |
---|
1036 | } else { |
---|
1037 | recordReader = reader; |
---|
1038 | } |
---|
1039 | |
---|
1040 | if (SRU_DIAGNOSTIC_RECORD_SCHEMA.equals(schema)) { |
---|
1041 | surrogate = parseDiagnostic(recordReader, ns, |
---|
1042 | true, strictMode); |
---|
1043 | } else { |
---|
1044 | SRURecordDataParser parser = findParser(schema); |
---|
1045 | if (parser != null) { |
---|
1046 | try { |
---|
1047 | proxy.reset(recordReader); |
---|
1048 | recordData = parser.parse(proxy); |
---|
1049 | } catch (XMLStreamException e) { |
---|
1050 | throw new SRUClientException( |
---|
1051 | "error parsing record", e); |
---|
1052 | } finally { |
---|
1053 | /* |
---|
1054 | * make sure, we deallocate the record |
---|
1055 | * reader in case of string record |
---|
1056 | * packing |
---|
1057 | */ |
---|
1058 | if (recordXmlEscaping == SRURecordXmlEscaping.STRING) { |
---|
1059 | recordReader.closeCompletly(); |
---|
1060 | } |
---|
1061 | } |
---|
1062 | if (recordData == null) { |
---|
1063 | logger.debug("record parser did not parse " |
---|
1064 | + "record correctly and returned " |
---|
1065 | + "null; injecting client side " |
---|
1066 | + "surrogate diagnostic"); |
---|
1067 | surrogate = new SRUDiagnostic( |
---|
1068 | SRUClientDiagnostics.DIAG_RECORD_PARSER_NULL, |
---|
1069 | null, |
---|
1070 | "Record parser for schema '" + |
---|
1071 | schema + |
---|
1072 | "' did not " + |
---|
1073 | "parse record correctly " + |
---|
1074 | "and errornously " + |
---|
1075 | "returned null."); |
---|
1076 | } |
---|
1077 | } else { |
---|
1078 | /* |
---|
1079 | * no record parser found, inject a |
---|
1080 | * surrogate diagnostic |
---|
1081 | */ |
---|
1082 | logger.debug( |
---|
1083 | "no record data parser found " |
---|
1084 | + "for schema '{}'; injecting client " |
---|
1085 | + "side surrogate diagnostic", |
---|
1086 | schema); |
---|
1087 | surrogate = new SRUDiagnostic( |
---|
1088 | SRUClientDiagnostics.DIAG_NO_RECORD_PARSER, |
---|
1089 | schema, |
---|
1090 | "No record data parser for schema '" + |
---|
1091 | schema + "' found."); |
---|
1092 | } |
---|
1093 | } |
---|
1094 | |
---|
1095 | reader.consumeWhitespace(); |
---|
1096 | reader.readEnd(ns.sruNS(), "recordData", true); |
---|
1097 | |
---|
1098 | String identifier = null; |
---|
1099 | if (version.isVersion(SRUVersion.VERSION_1_2, |
---|
1100 | SRUVersion.VERSION_2_0)) { |
---|
1101 | identifier = reader.readContent(ns.sruNS(), |
---|
1102 | "recordIdentifier", false); |
---|
1103 | } |
---|
1104 | |
---|
1105 | int position = reader.readContent(ns.sruNS(), |
---|
1106 | "recordPosition", false, -1); |
---|
1107 | |
---|
1108 | logger.debug("recordIdentifier = {}, " + |
---|
1109 | "recordPosition = {}", |
---|
1110 | identifier, position); |
---|
1111 | |
---|
1112 | // notify handler |
---|
1113 | if (surrogate != null) { |
---|
1114 | handler.onSurrogateRecord(identifier, |
---|
1115 | position, surrogate); |
---|
1116 | } else { |
---|
1117 | if (recordData != null) { |
---|
1118 | handler.onRecord(identifier, |
---|
1119 | position, recordData); |
---|
1120 | } |
---|
1121 | } |
---|
1122 | |
---|
1123 | if (reader.readStart(ns.sruNS(), |
---|
1124 | "extraRecordData", false)) { |
---|
1125 | reader.consumeWhitespace(); |
---|
1126 | proxy.reset(reader); |
---|
1127 | try { |
---|
1128 | handler.onExtraRecordData(identifier, |
---|
1129 | position, proxy); |
---|
1130 | } catch (XMLStreamException e) { |
---|
1131 | throw new SRUClientException("handler " + |
---|
1132 | "triggered error while parsing " + |
---|
1133 | "'extraRecordData'", e); |
---|
1134 | } |
---|
1135 | reader.consumeWhitespace(); |
---|
1136 | reader.readEnd(ns.sruNS(), "extraRecordData", true); |
---|
1137 | } |
---|
1138 | |
---|
1139 | reader.readEnd(ns.sruNS(), "record"); |
---|
1140 | recordCount++; |
---|
1141 | } // while |
---|
1142 | reader.readEnd(ns.sruNS(), "records"); |
---|
1143 | } |
---|
1144 | if (recordCount == 0) { |
---|
1145 | logger.error("endpoint declared {} results, but response contained no <record> elements (behavior may violate SRU specification)", numberOfRecords); |
---|
1146 | } else if ((request.getMaximumRecords() != -1) && (recordCount > request.getMaximumRecords())) { |
---|
1147 | logger.error("endpoint did not honour 'maximumRecords' request parameter and responded with {} records instead of a maximum of {}", recordCount, request.getMaximumRecords()); |
---|
1148 | } |
---|
1149 | } else { |
---|
1150 | /* |
---|
1151 | * provide a better error format, if endpoints responds with |
---|
1152 | * an empty <records> element |
---|
1153 | */ |
---|
1154 | if (reader.readStart(ns.sruNS(), "records", false)) { |
---|
1155 | int bad = 0; |
---|
1156 | while (reader.readStart(ns.sruNS(), "record", false)) { |
---|
1157 | bad++; |
---|
1158 | reader.readEnd(ns.sruNS(), "record", true); |
---|
1159 | } |
---|
1160 | reader.readEnd(ns.sruNS(), "records", true); |
---|
1161 | if (bad == 0) { |
---|
1162 | logger.error("endpoint declared 0 results, but " + |
---|
1163 | "response contained an empty 'records' " + |
---|
1164 | "element"); |
---|
1165 | if (strictMode) { |
---|
1166 | throw new SRUClientException( |
---|
1167 | "endpoint declared 0 results, but " + |
---|
1168 | "response contained an empty " + |
---|
1169 | "'records' element (behavior " + |
---|
1170 | "violates SRU specification)"); |
---|
1171 | } |
---|
1172 | } else { |
---|
1173 | logger.error("endpoint declared 0 results, but " + |
---|
1174 | "response contained " + bad + |
---|
1175 | " record(s)"); |
---|
1176 | if (strictMode) { |
---|
1177 | throw new SRUClientException( |
---|
1178 | "endpoint declared 0 results, " + |
---|
1179 | "but response containted " + bad + |
---|
1180 | " records (behavior may violate " + |
---|
1181 | "SRU specification)"); |
---|
1182 | } |
---|
1183 | } |
---|
1184 | } |
---|
1185 | } |
---|
1186 | |
---|
1187 | int nextRecordPosition = reader.readContent(ns.sruNS(), |
---|
1188 | "nextRecordPosition", false, -1); |
---|
1189 | logger.debug("nextRecordPosition = {}", nextRecordPosition); |
---|
1190 | handler.onFinishRecords(nextRecordPosition); |
---|
1191 | |
---|
1192 | // searchRetrieveResponse/echoedSearchRetrieveResponse |
---|
1193 | if (reader.readStart(ns.sruNS(), |
---|
1194 | "echoedSearchRetrieveRequest", false)) { |
---|
1195 | reader.readEnd(ns.sruNS(), "echoedSearchRetrieveRequest", true); |
---|
1196 | } |
---|
1197 | |
---|
1198 | /* |
---|
1199 | * common error: echoedSearchRetrieveRequest in |
---|
1200 | * default namespace |
---|
1201 | */ |
---|
1202 | if (reader.readStart("", "echoedSearchRetrieveRequest", false)) { |
---|
1203 | logger.error("Element 'echoedSearchRetrieveRequest' " + |
---|
1204 | "must be in SRU namespace, but endpoint put it " + |
---|
1205 | "into default namespace"); |
---|
1206 | if (strictMode) { |
---|
1207 | throw new SRUClientException( |
---|
1208 | "Element 'echoedSearchRetrieveRequest' must " + |
---|
1209 | "be in SRU namespace, but endpoint put it " + |
---|
1210 | "into default namespace"); |
---|
1211 | } |
---|
1212 | reader.readEnd("", "echoedSearchRetrieveRequest", true); |
---|
1213 | } |
---|
1214 | |
---|
1215 | // searchRetrieveResponse/diagnostics |
---|
1216 | final List<SRUDiagnostic> diagnostics = |
---|
1217 | parseDiagnostics(reader, ns, ns.sruNS(), strictMode); |
---|
1218 | if (diagnostics != null) { |
---|
1219 | handler.onDiagnostics(diagnostics); |
---|
1220 | } |
---|
1221 | |
---|
1222 | // explainResponse/extraResponseData |
---|
1223 | if (reader.readStart(ns.sruNS(), "extraResponseData", false)) { |
---|
1224 | reader.consumeWhitespace(); |
---|
1225 | proxy.reset(reader); |
---|
1226 | try { |
---|
1227 | handler.onExtraResponseData(proxy); |
---|
1228 | } catch (XMLStreamException e) { |
---|
1229 | throw new SRUClientException("handler triggered " |
---|
1230 | + "error while parsing 'extraResponseData'", e); |
---|
1231 | } |
---|
1232 | reader.consumeWhitespace(); |
---|
1233 | reader.readEnd(ns.sruNS(), "extraResponseData", true); |
---|
1234 | } |
---|
1235 | |
---|
1236 | if (version.isVersion(SRUVersion.VERSION_2_0)) { |
---|
1237 | // SRU (2.0) arbitrary stuff |
---|
1238 | // SRU (2.0) resultSetTTL (replaces resultSetIdleTime) |
---|
1239 | // SRU (2.0) resultCountPrecision |
---|
1240 | if (reader.readStart(ns.sruNS(), "resultCountPrecision", false)) { |
---|
1241 | reader.readEnd(ns.sruNS(), "resultCountPrecision", true); |
---|
1242 | } |
---|
1243 | // SRU (2.0) facetedResults |
---|
1244 | // SRU (2.0) searchResultAnalysis |
---|
1245 | } |
---|
1246 | reader.readEnd(ns.sruNS(), "searchRetrieveResponse"); |
---|
1247 | } |
---|
1248 | } catch (XMLStreamException e) { |
---|
1249 | throw new SRUClientException(e.getMessage(), e); |
---|
1250 | } |
---|
1251 | } |
---|
1252 | |
---|
1253 | |
---|
1254 | private static SRUVersion parseVersion(SRUXMLStreamReader reader, |
---|
1255 | String envelopNs) throws XMLStreamException, SRUClientException { |
---|
1256 | final String v = reader.readContent(envelopNs, "version", true); |
---|
1257 | if (VERSION_1_1.equals(v)) { |
---|
1258 | return SRUVersion.VERSION_1_1; |
---|
1259 | } else if (VERSION_1_2.equals(v)) { |
---|
1260 | return SRUVersion.VERSION_1_2; |
---|
1261 | } else if (VERSION_2_0.equals(v)) { |
---|
1262 | return SRUVersion.VERSION_2_0; |
---|
1263 | } else { |
---|
1264 | throw new SRUClientException("invalid value '" + v + |
---|
1265 | "' for version (valid values are: '" + VERSION_1_1 + |
---|
1266 | "' and '" + VERSION_1_2 + "')"); |
---|
1267 | } |
---|
1268 | } |
---|
1269 | |
---|
1270 | |
---|
1271 | private static List<SRUDiagnostic> parseDiagnostics( |
---|
1272 | SRUXMLStreamReader reader, SRUNamespaces ns, String responseNs, boolean strictMode) |
---|
1273 | throws XMLStreamException, SRUClientException { |
---|
1274 | if (reader.readStart(responseNs, "diagnostics", false)) { |
---|
1275 | List<SRUDiagnostic> diagnostics = null; |
---|
1276 | |
---|
1277 | SRUDiagnostic diagnostic = null; |
---|
1278 | while ((diagnostic = parseDiagnostic(reader, ns, |
---|
1279 | (diagnostics == null), strictMode)) != null) { |
---|
1280 | if (diagnostics == null) { |
---|
1281 | diagnostics = new ArrayList<SRUDiagnostic>(); |
---|
1282 | } |
---|
1283 | diagnostics.add(diagnostic); |
---|
1284 | } // while |
---|
1285 | reader.readEnd(responseNs, "diagnostics"); |
---|
1286 | return diagnostics; |
---|
1287 | } else { |
---|
1288 | return null; |
---|
1289 | } |
---|
1290 | } |
---|
1291 | |
---|
1292 | |
---|
1293 | private static SRUDiagnostic parseDiagnostic(SRUXMLStreamReader reader, |
---|
1294 | SRUNamespaces ns, boolean required, boolean strictMode) throws XMLStreamException, |
---|
1295 | SRUClientException { |
---|
1296 | if (reader.readStart(ns.diagnosticNS(), "diagnostic", required)) { |
---|
1297 | |
---|
1298 | // diagnostic/uri |
---|
1299 | String uri = reader.readContent(ns.diagnosticNS(), "uri", true); |
---|
1300 | |
---|
1301 | String details = null; |
---|
1302 | String message = null; |
---|
1303 | if (strictMode) { |
---|
1304 | // diagnostic/details |
---|
1305 | details = reader.readContent(ns.diagnosticNS(), "details", |
---|
1306 | false, true); |
---|
1307 | |
---|
1308 | // diagnostic/message |
---|
1309 | message = reader.readContent(ns.diagnosticNS(), "message", |
---|
1310 | false, true); |
---|
1311 | } else { |
---|
1312 | /* |
---|
1313 | * common error: diagnostic/details and diagnostic/message may |
---|
1314 | * appear in any order |
---|
1315 | */ |
---|
1316 | if (reader.peekStart(ns.diagnosticNS(), "details")) { |
---|
1317 | details = reader.readContent(ns.diagnosticNS(), "details", |
---|
1318 | false, false); |
---|
1319 | message = reader.readContent(ns.diagnosticNS(), "message", |
---|
1320 | false, false); |
---|
1321 | } else { |
---|
1322 | message = reader.readContent(ns.diagnosticNS(), "message", |
---|
1323 | false, false); |
---|
1324 | details = reader.readContent(ns.diagnosticNS(), "details", |
---|
1325 | false, false); |
---|
1326 | if ((message != null) && (details != null)) { |
---|
1327 | logger.error("element <message> and element " + |
---|
1328 | "<details> within element <diagnostic> " + |
---|
1329 | "appeared in wrong order"); |
---|
1330 | } |
---|
1331 | } |
---|
1332 | } |
---|
1333 | |
---|
1334 | if ((details != null) && details.isEmpty()) { |
---|
1335 | details = null; |
---|
1336 | logger.debug("omitting empty element <details> " + |
---|
1337 | "within element <diagnostic>"); |
---|
1338 | } |
---|
1339 | if ((message != null) && message.isEmpty()) { |
---|
1340 | message = null; |
---|
1341 | logger.debug("omitting empty element <message> " + |
---|
1342 | "within element <diagnostic>"); |
---|
1343 | } |
---|
1344 | |
---|
1345 | reader.readEnd(ns.diagnosticNS(), "diagnostic"); |
---|
1346 | |
---|
1347 | logger.debug("diagnostic: uri={}, detail={}, message={}", |
---|
1348 | uri, details, message); |
---|
1349 | return new SRUDiagnostic(uri, details, message); |
---|
1350 | } else { |
---|
1351 | return null; |
---|
1352 | } |
---|
1353 | } |
---|
1354 | |
---|
1355 | |
---|
1356 | private static SRURecordPacking parseRecordPacking( |
---|
1357 | SRUXMLStreamReader reader, String envelopNs, boolean strictMode) |
---|
1358 | throws XMLStreamException, SRUClientException { |
---|
1359 | final String s = reader.readContent(envelopNs, "recordPacking", false); |
---|
1360 | if (s != null) { |
---|
1361 | if (RECORD_PACKING_PACKED.equals(s)) { |
---|
1362 | return SRURecordPacking.PACKED; |
---|
1363 | } else if (RECORD_PACKING_UNPACKED.equals(s)) { |
---|
1364 | return SRURecordPacking.UNPACKED; |
---|
1365 | } else if (!strictMode && RECORD_PACKING_PACKED.equalsIgnoreCase(s)) { |
---|
1366 | logger.error("invalid value '{}' for '<recordPacking>', should be '{}'", |
---|
1367 | s, RECORD_PACKING_PACKED); |
---|
1368 | return SRURecordPacking.PACKED; |
---|
1369 | } else if (!strictMode && RECORD_PACKING_UNPACKED.equalsIgnoreCase(s)) { |
---|
1370 | logger.error("invalid value '{}' for '<recordPacking>', should be '{}'", |
---|
1371 | s, RECORD_PACKING_UNPACKED); |
---|
1372 | return SRURecordPacking.UNPACKED; |
---|
1373 | } else { |
---|
1374 | throw new SRUClientException("invalid value '" + s + |
---|
1375 | "' for '<recordPacking>' (valid values are: '" + |
---|
1376 | RECORD_PACKING_PACKED + "' and '" + RECORD_PACKING_UNPACKED + |
---|
1377 | "')"); |
---|
1378 | } |
---|
1379 | } |
---|
1380 | return null; |
---|
1381 | } |
---|
1382 | |
---|
1383 | |
---|
1384 | private static SRURecordXmlEscaping parseRecordXmlEscaping( |
---|
1385 | SRUXMLStreamReader reader, SRUNamespaces ns, SRUVersion version, boolean strictMode) |
---|
1386 | throws XMLStreamException, SRUClientException { |
---|
1387 | |
---|
1388 | final String name = version.isVersion(SRUVersion.VERSION_2_0) |
---|
1389 | ? "recordXMLEscaping" : "recordPacking"; |
---|
1390 | final String s = reader.readContent(ns.sruNS(), name, true); |
---|
1391 | |
---|
1392 | if (RECORD_ESCAPING_XML.equals(s)) { |
---|
1393 | return SRURecordXmlEscaping.XML; |
---|
1394 | } else if (RECORD_ESCAPING_STRING.equals(s)) { |
---|
1395 | return SRURecordXmlEscaping.STRING; |
---|
1396 | } else if (!strictMode && RECORD_ESCAPING_XML.equalsIgnoreCase(s)) { |
---|
1397 | logger.error("invalid value '{}' for '<{}>', should be '{}'", |
---|
1398 | s, name, RECORD_ESCAPING_XML); |
---|
1399 | return SRURecordXmlEscaping.XML; |
---|
1400 | } else if (!strictMode && RECORD_ESCAPING_STRING.equalsIgnoreCase(s)) { |
---|
1401 | logger.error("invalid value '{}' for '<{}>', should be '{}'", |
---|
1402 | s, name, RECORD_ESCAPING_STRING); |
---|
1403 | return SRURecordXmlEscaping.STRING; |
---|
1404 | } else { |
---|
1405 | throw new SRUClientException("invalid value '" + s + |
---|
1406 | "' for '<" + name + ">' (valid values are: '" + |
---|
1407 | RECORD_ESCAPING_XML + "' and '" + RECORD_ESCAPING_STRING + |
---|
1408 | "')"); |
---|
1409 | } |
---|
1410 | } |
---|
1411 | |
---|
1412 | |
---|
1413 | private SRURecordDataParser findParser(String schema) { |
---|
1414 | SRURecordDataParser parser = parsers.get(schema); |
---|
1415 | if (parser == null) { |
---|
1416 | parser = parsers.get(SRUClientConstants.RECORD_DATA_PARSER_SCHEMA_ANY); |
---|
1417 | } |
---|
1418 | return parser; |
---|
1419 | } |
---|
1420 | |
---|
1421 | |
---|
1422 | private static SRUXMLStreamReader createReader(InputStream in, boolean wrap) |
---|
1423 | throws XMLStreamException { |
---|
1424 | return new SRUXMLStreamReader(in, wrap); |
---|
1425 | } |
---|
1426 | |
---|
1427 | |
---|
1428 | private static CloseableHttpClient createHttpClient(int connectTimeout, |
---|
1429 | int socketTimeout) { |
---|
1430 | final PoolingHttpClientConnectionManager manager = |
---|
1431 | new PoolingHttpClientConnectionManager(); |
---|
1432 | manager.setDefaultMaxPerRoute(8); |
---|
1433 | manager.setMaxTotal(128); |
---|
1434 | |
---|
1435 | final SocketConfig socketConfig = SocketConfig.custom() |
---|
1436 | .setSoReuseAddress(true) |
---|
1437 | .setSoLinger(0) |
---|
1438 | .build(); |
---|
1439 | |
---|
1440 | final RequestConfig requestConfig = RequestConfig.custom() |
---|
1441 | .setAuthenticationEnabled(false) |
---|
1442 | .setRedirectsEnabled(true) |
---|
1443 | .setMaxRedirects(4) |
---|
1444 | .setCircularRedirectsAllowed(false) |
---|
1445 | .setCookieSpec(CookieSpecs.IGNORE_COOKIES) |
---|
1446 | .setConnectTimeout(connectTimeout) |
---|
1447 | .setSocketTimeout(socketTimeout) |
---|
1448 | .setConnectionRequestTimeout(0) /* infinite */ |
---|
1449 | .build(); |
---|
1450 | |
---|
1451 | return HttpClients.custom() |
---|
1452 | .setUserAgent(USER_AGENT) |
---|
1453 | .setConnectionManager(manager) |
---|
1454 | .setDefaultSocketConfig(socketConfig) |
---|
1455 | .setDefaultRequestConfig(requestConfig) |
---|
1456 | .setConnectionReuseStrategy(new NoConnectionReuseStrategy()) |
---|
1457 | .build(); |
---|
1458 | } |
---|
1459 | |
---|
1460 | |
---|
1461 | private static SRUNamespaces detectNamespace(XMLStreamReader reader, |
---|
1462 | SRUVersion requestedVersion) |
---|
1463 | throws SRUClientException { |
---|
1464 | try { |
---|
1465 | // skip to first start tag |
---|
1466 | reader.nextTag(); |
---|
1467 | |
---|
1468 | final String namespaceURI = reader.getNamespaceURI(); |
---|
1469 | logger.debug("found namespace URI '{}', requested version = {}", |
---|
1470 | namespaceURI, requestedVersion); |
---|
1471 | |
---|
1472 | SRUNamespaces namespace; |
---|
1473 | if (NAMESPACES_LEGACY_LOC.matchNamespace(namespaceURI)) { |
---|
1474 | namespace = NAMESPACES_LEGACY_LOC; |
---|
1475 | } else if (NAMESPACES_OASIS.matchNamespace(namespaceURI)) { |
---|
1476 | namespace = NAMESPACES_OASIS; |
---|
1477 | } else { |
---|
1478 | throw new SRUClientException( |
---|
1479 | "invalid namespace '" + reader.getNamespaceURI() + "'"); |
---|
1480 | } |
---|
1481 | |
---|
1482 | if (requestedVersion != null) { |
---|
1483 | if (!namespace.compatibleWithVersion(requestedVersion)) { |
---|
1484 | throw new SRUClientException("Server did not honour " + |
---|
1485 | "requested SRU version and responded with " + |
---|
1486 | "different version (requested version was " + |
---|
1487 | requestedVersion + ")"); |
---|
1488 | } |
---|
1489 | } |
---|
1490 | return namespace; |
---|
1491 | } catch (XMLStreamException e) { |
---|
1492 | throw new SRUClientException("error detecting namespace", e); |
---|
1493 | } |
---|
1494 | } |
---|
1495 | |
---|
1496 | |
---|
1497 | private interface SRUNamespaces { |
---|
1498 | public boolean compatibleWithVersion(SRUVersion version); |
---|
1499 | |
---|
1500 | public String sruNS(); |
---|
1501 | |
---|
1502 | public String scanNS(); |
---|
1503 | |
---|
1504 | public String diagnosticNS(); |
---|
1505 | |
---|
1506 | public boolean matchNamespace(String namespaceURI); |
---|
1507 | |
---|
1508 | } // interface SRUNamespace |
---|
1509 | |
---|
1510 | |
---|
1511 | private static final SRUNamespaces NAMESPACES_LEGACY_LOC = new SRUNamespaces() { |
---|
1512 | private static final String SRU_NS = |
---|
1513 | "http://www.loc.gov/zing/srw/"; |
---|
1514 | private static final String SRU_DIAGNOSIC_NS = |
---|
1515 | "http://www.loc.gov/zing/srw/diagnostic/"; |
---|
1516 | |
---|
1517 | |
---|
1518 | @Override |
---|
1519 | public boolean compatibleWithVersion(SRUVersion version) { |
---|
1520 | return SRUVersion.VERSION_1_1.equals(version) || |
---|
1521 | SRUVersion.VERSION_1_2.equals(version); |
---|
1522 | } |
---|
1523 | |
---|
1524 | |
---|
1525 | @Override |
---|
1526 | public String sruNS() { |
---|
1527 | return SRU_NS; |
---|
1528 | } |
---|
1529 | |
---|
1530 | |
---|
1531 | @Override |
---|
1532 | public String scanNS() { |
---|
1533 | return SRU_NS; |
---|
1534 | } |
---|
1535 | |
---|
1536 | |
---|
1537 | @Override |
---|
1538 | public String diagnosticNS() { |
---|
1539 | return SRU_DIAGNOSIC_NS; |
---|
1540 | } |
---|
1541 | |
---|
1542 | |
---|
1543 | @Override |
---|
1544 | public boolean matchNamespace(String namespaceURI) { |
---|
1545 | return SRU_NS.equals(namespaceURI); |
---|
1546 | } |
---|
1547 | }; |
---|
1548 | |
---|
1549 | |
---|
1550 | private static final SRUNamespaces NAMESPACES_OASIS = new SRUNamespaces() { |
---|
1551 | private static final String SRU_NS = |
---|
1552 | "http://docs.oasis-open.org/ns/search-ws/sruResponse"; |
---|
1553 | private static final String SRU_SCAN_NS = |
---|
1554 | "http://docs.oasis-open.org/ns/search-ws/scan"; |
---|
1555 | private static final String SRU_DIAGNOSIC_NS = |
---|
1556 | "http://docs.oasis-open.org/ns/search-ws/diagnostic"; |
---|
1557 | |
---|
1558 | |
---|
1559 | @Override |
---|
1560 | public boolean compatibleWithVersion(SRUVersion version) { |
---|
1561 | return SRUVersion.VERSION_2_0.equals(version); |
---|
1562 | } |
---|
1563 | |
---|
1564 | |
---|
1565 | @Override |
---|
1566 | public String sruNS() { |
---|
1567 | return SRU_NS; |
---|
1568 | } |
---|
1569 | |
---|
1570 | |
---|
1571 | @Override |
---|
1572 | public String scanNS() { |
---|
1573 | return SRU_SCAN_NS; |
---|
1574 | |
---|
1575 | } |
---|
1576 | |
---|
1577 | |
---|
1578 | @Override |
---|
1579 | public String diagnosticNS() { |
---|
1580 | return SRU_DIAGNOSIC_NS; |
---|
1581 | } |
---|
1582 | |
---|
1583 | |
---|
1584 | @Override |
---|
1585 | public boolean matchNamespace(String namespaceURI) { |
---|
1586 | return SRU_NS.equals(namespaceURI) || SRU_SCAN_NS.equals(namespaceURI); |
---|
1587 | } |
---|
1588 | }; |
---|
1589 | |
---|
1590 | } // class SRUSimpleClient |
---|