1 | package eu.clarin.cmdi.oai.harvester.impl; |
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2 | |
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3 | import java.io.InputStream; |
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4 | import java.net.URI; |
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5 | import java.net.URISyntaxException; |
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6 | |
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7 | import javax.xml.stream.XMLInputFactory; |
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8 | import javax.xml.stream.XMLStreamException; |
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9 | import javax.xml.stream.XMLStreamReader; |
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10 | |
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11 | import org.codehaus.stax2.XMLInputFactory2; |
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12 | import org.codehaus.stax2.XMLStreamReader2; |
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13 | |
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14 | import eu.clarin.cmdi.oai.harvester.HarvestHandler; |
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15 | import eu.clarin.cmdi.oai.harvester.HarvestJob; |
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16 | import eu.clarin.cmdi.oai.harvester.Harvester; |
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17 | import eu.clarin.cmdi.oai.harvester.HarvesterException; |
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18 | |
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19 | abstract class AbstractHarvester implements Harvester { |
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20 | private static final int DEFAULT_MAX_NETWORK_RETRY_COUNT = 5; |
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21 | protected int maxNetworkRetryCount = DEFAULT_MAX_NETWORK_RETRY_COUNT; |
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22 | private final XMLInputFactory factory; |
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23 | // private final XMLValidationSchema schema; |
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24 | |
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25 | protected AbstractHarvester() { |
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26 | factory = XMLInputFactory2.newInstance(); |
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27 | factory.setProperty(XMLInputFactory.IS_COALESCING, Boolean.TRUE); |
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28 | factory.setProperty(XMLInputFactory.IS_NAMESPACE_AWARE, |
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29 | Boolean.TRUE); |
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30 | factory.setProperty(XMLInputFactory2.P_AUTO_CLOSE_INPUT, |
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31 | Boolean.FALSE); |
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32 | // XMLValidationSchemaFactory schemaFactory = |
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33 | // XMLValidationSchemaFactory |
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34 | // .newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI); |
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35 | // URL url = Harvester.class.getClassLoader().getResource( |
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36 | // "META-INF/OAI-PMH.xsd"); |
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37 | // if (url == null) { |
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38 | // throw new NullPointerException("schema not found!"); |
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39 | // } |
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40 | // schema = schemaFactory.createSchema(url); |
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41 | } |
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42 | |
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43 | public abstract HarvestJob createJob(URI repositoryURI, |
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44 | HarvestHandler handler) throws HarvesterException; |
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45 | |
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46 | public final HarvestJob createJob(URI repositoryURI) |
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47 | throws HarvesterException { |
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48 | return createJob(repositoryURI, null); |
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49 | } |
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50 | |
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51 | @Override |
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52 | public final HarvestJob createJob(String repositoryURI, |
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53 | HarvestHandler handler) throws HarvesterException { |
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54 | try { |
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55 | return createJob(new URI(repositoryURI), handler); |
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56 | } catch (URISyntaxException e) { |
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57 | throw new HarvesterException("invalid repositoryURI", e); |
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58 | } |
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59 | } |
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60 | |
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61 | @Override |
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62 | public final HarvestJob createJob(String repositoryURI) |
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63 | throws HarvesterException { |
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64 | return createJob(repositoryURI, null); |
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65 | } |
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66 | |
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67 | @Override |
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68 | public final HarvestJob findJob(long id) throws HarvesterException { |
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69 | return doFindJob(id); |
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70 | } |
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71 | |
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72 | @Override |
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73 | public final HarvestJob cancelJob(long id) throws HarvesterException { |
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74 | HarvestJob job = doFindJob(id); |
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75 | if (job != null) { |
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76 | job.cancel(); |
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77 | } |
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78 | return job; |
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79 | } |
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80 | |
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81 | @Override |
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82 | public final int getMaxNetworkRetryCount() { |
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83 | return maxNetworkRetryCount; |
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84 | } |
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85 | |
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86 | @Override |
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87 | public final void setMaxNetworkRetryCount(int maxNetworkRetryCount) { |
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88 | if (maxNetworkRetryCount < 1) { |
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89 | throw new IllegalArgumentException( |
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90 | "invalid value for maxNetworkRetryCount: " + |
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91 | maxNetworkRetryCount); |
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92 | } |
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93 | this.maxNetworkRetryCount = maxNetworkRetryCount; |
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94 | } |
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95 | |
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96 | abstract void doRunJob(HarvestJobImpl job) throws HarvesterException; |
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97 | |
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98 | abstract void doCancelJob(HarvestJobImpl job) throws HarvesterException; |
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99 | |
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100 | protected abstract HarvestJob doFindJob(long id) |
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101 | throws HarvesterException; |
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102 | |
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103 | protected final XMLStreamReader createReader(InputStream in) |
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104 | throws XMLStreamException { |
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105 | XMLStreamReader2 reader = |
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106 | (XMLStreamReader2) factory.createXMLStreamReader(in); |
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107 | // reader.validateAgainst(schema); |
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108 | return reader; |
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109 | } |
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110 | |
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111 | } // abstract class AbstractHarvester |
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