1 | package eu.clarin.cmdi.virtualcollectionregistry; |
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2 | |
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3 | import eu.clarin.cmdi.oai.provider.impl.OAIProvider; |
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4 | import eu.clarin.cmdi.virtualcollectionregistry.model.User; |
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5 | import eu.clarin.cmdi.virtualcollectionregistry.model.User_; |
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6 | import eu.clarin.cmdi.virtualcollectionregistry.model.VirtualCollection; |
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7 | import eu.clarin.cmdi.virtualcollectionregistry.model.VirtualCollectionList; |
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8 | import eu.clarin.cmdi.virtualcollectionregistry.pid.PersistentIdentifier; |
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9 | import eu.clarin.cmdi.virtualcollectionregistry.pid.PersistentIdentifierProvider; |
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10 | import eu.clarin.cmdi.virtualcollectionregistry.query.ParsedQuery; |
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11 | import eu.clarin.cmdi.virtualcollectionregistry.service.VirtualCollectionValidator; |
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12 | import java.security.Principal; |
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13 | import java.util.Date; |
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14 | import java.util.List; |
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15 | import java.util.concurrent.Executors; |
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16 | import java.util.concurrent.ScheduledExecutorService; |
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17 | import java.util.concurrent.ThreadFactory; |
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18 | import java.util.concurrent.TimeUnit; |
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19 | import java.util.concurrent.atomic.AtomicBoolean; |
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20 | import java.util.concurrent.atomic.AtomicInteger; |
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21 | import javax.persistence.EntityManager; |
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22 | import javax.persistence.EntityTransaction; |
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23 | import javax.persistence.LockModeType; |
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24 | import javax.persistence.NoResultException; |
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25 | import javax.persistence.TypedQuery; |
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26 | import javax.persistence.criteria.CriteriaBuilder; |
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27 | import javax.persistence.criteria.CriteriaQuery; |
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28 | import javax.persistence.criteria.Order; |
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29 | import javax.persistence.criteria.Predicate; |
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30 | import javax.persistence.criteria.Root; |
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31 | import org.slf4j.Logger; |
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32 | import org.slf4j.LoggerFactory; |
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33 | import org.springframework.beans.factory.DisposableBean; |
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34 | import org.springframework.beans.factory.InitializingBean; |
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35 | import org.springframework.beans.factory.annotation.Autowired; |
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36 | import org.springframework.beans.factory.annotation.Qualifier; |
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37 | import org.springframework.stereotype.Service; |
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38 | |
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39 | @Service |
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40 | public class VirtualCollectionRegistry implements InitializingBean, DisposableBean { |
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41 | |
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42 | @Autowired |
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43 | private DataStore datastore; //TODO: replace with Spring managed EM? |
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44 | @Autowired |
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45 | private PersistentIdentifierProvider pid_provider; |
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46 | @Autowired |
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47 | private OAIProvider oaiProvider; |
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48 | @Autowired |
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49 | @Qualifier("creation") |
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50 | private VirtualCollectionValidator validator; |
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51 | @Autowired |
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52 | private AdminUsersService adminUsersService; |
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53 | |
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54 | private static final Logger logger |
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55 | = LoggerFactory.getLogger(VirtualCollectionRegistry.class); |
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56 | private final AtomicBoolean intialized = new AtomicBoolean(false); |
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57 | /** |
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58 | * Scheduled executor service for the maintenance check |
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59 | * |
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60 | * @see #maintenance(long) |
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61 | */ |
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62 | private final ScheduledExecutorService maintenanceExecutor |
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63 | = createSingleThreadScheduledExecutor("VirtualCollectionRegistry-Maintenance"); |
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64 | |
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65 | @Override |
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66 | public void afterPropertiesSet() throws VirtualCollectionRegistryException { |
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67 | // called by Spring directly after Bean construction |
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68 | doInitalize(); |
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69 | } |
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70 | |
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71 | private void doInitalize() throws VirtualCollectionRegistryException { |
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72 | if (intialized.get()) { |
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73 | throw new VirtualCollectionRegistryException("already initialized"); |
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74 | } |
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75 | logger.info("Initializing virtual collection registry ..."); |
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76 | try { |
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77 | maintenanceExecutor.scheduleWithFixedDelay(new Runnable() { |
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78 | |
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79 | @Override |
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80 | public void run() { |
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81 | maintenance(new Date().getTime()); |
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82 | } |
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83 | }, 60, 60, TimeUnit.SECONDS); |
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84 | this.intialized.set(true); |
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85 | logger.info("virtual collection registry successfully intialized"); |
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86 | } catch (RuntimeException e) { |
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87 | logger.error("error initalizing virtual collection registry", e); |
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88 | throw e; |
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89 | } |
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90 | } |
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91 | |
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92 | @Override |
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93 | public void destroy() throws VirtualCollectionRegistryException, InterruptedException { |
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94 | logger.info("Stopping Virtual Collection Registry maintenance schedule"); |
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95 | maintenanceExecutor.shutdown(); |
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96 | if (!maintenanceExecutor.awaitTermination(60, TimeUnit.SECONDS)) { |
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97 | logger.warn("Timeout while waiting for maintenance thread to terminate, will try to shut down"); |
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98 | } |
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99 | |
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100 | logger.info("Shutting down OAI provider"); |
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101 | oaiProvider.shutdown(); |
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102 | } |
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103 | |
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104 | /** |
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105 | * Will store the specified collection; it will also set the owner according |
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106 | * to the specified principal and set its state to |
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107 | * {@link VirtualCollection.State#PRIVATE} |
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108 | * |
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109 | * @param principal owner principal |
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110 | * @param vc collection to store |
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111 | * @return identifier of the persisted collection |
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112 | * @throws VirtualCollectionRegistryException |
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113 | */ |
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114 | public long createVirtualCollection(Principal principal, |
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115 | VirtualCollection vc) throws VirtualCollectionRegistryException { |
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116 | if (principal == null) { |
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117 | throw new NullPointerException("principal == null"); |
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118 | } |
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119 | if (vc == null) { |
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120 | throw new NullPointerException("vc == null"); |
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121 | } |
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122 | |
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123 | logger.debug("creating virtual collection"); |
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124 | |
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125 | validator.validate(vc); |
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126 | try { |
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127 | EntityManager em = datastore.getEntityManager(); |
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128 | em.getTransaction().begin(); |
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129 | |
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130 | // fetch user, if user does not exist create new |
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131 | User user = fetchUser(em, principal); |
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132 | if (user == null) { |
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133 | user = new User(principal.getName()); |
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134 | em.persist(user); |
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135 | } |
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136 | vc.setOwner(user); |
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137 | |
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138 | // force new collection to be private |
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139 | vc.setState(VirtualCollection.State.PRIVATE); |
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140 | |
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141 | // store virtual collection |
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142 | logger.debug("persisting new virtual collection", vc.getId()); |
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143 | em.persist(vc); |
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144 | em.getTransaction().commit(); |
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145 | logger.debug("virtual collection created (id={})", vc.getId()); |
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146 | return vc.getId(); |
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147 | } catch (Exception e) { |
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148 | logger.error("error while creating virtual collection", e); |
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149 | throw new VirtualCollectionRegistryException( |
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150 | "error while creating virtual collection", e); |
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151 | } |
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152 | } |
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153 | |
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154 | public long updateVirtualCollection(Principal principal, long id, |
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155 | VirtualCollection vc) throws VirtualCollectionRegistryException { |
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156 | if (principal == null) { |
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157 | throw new NullPointerException("principal == null"); |
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158 | } |
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159 | if (id <= 0) { |
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160 | throw new IllegalArgumentException("id <= 0"); |
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161 | } |
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162 | if (vc == null) { |
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163 | throw new NullPointerException("vc == null"); |
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164 | } |
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165 | |
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166 | logger.debug("updating virtual collection (id={})", id); |
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167 | |
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168 | validator.validate(vc); |
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169 | |
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170 | try { |
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171 | EntityManager em = datastore.getEntityManager(); |
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172 | em.getTransaction().begin(); |
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173 | VirtualCollection c = em.find(VirtualCollection.class, |
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174 | Long.valueOf(id), LockModeType.PESSIMISTIC_WRITE); |
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175 | /* |
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176 | * Do not check for deleted state here, as we might want to |
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177 | * resurrect deleted virtual collections. |
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178 | */ |
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179 | if (c == null) { |
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180 | logger.debug("virtual collection (id={}) not found", id); |
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181 | throw new VirtualCollectionNotFoundException(id); |
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182 | } |
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183 | if (!isAllowedToModify(principal, c)) { |
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184 | throw new VirtualCollectionRegistryPermissionException( |
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185 | "permission denied for user \"" |
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186 | + principal.getName() + "\""); |
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187 | } |
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188 | |
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189 | // update virtual collection |
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190 | c.updateFrom(vc); |
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191 | |
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192 | validator.validate(c); |
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193 | em.merge(c); |
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194 | em.getTransaction().commit(); |
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195 | logger.debug("updated virtual collection (id={})", vc.getId()); |
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196 | return c.getId(); |
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197 | } catch (VirtualCollectionRegistryException e) { |
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198 | logger.warn("failed updating virtual collecion (id={}): {}", id, |
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199 | e.getMessage()); |
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200 | throw e; |
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201 | } catch (Exception e) { |
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202 | logger.error("error while updating virtual collection", e); |
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203 | throw new VirtualCollectionRegistryException( |
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204 | "error while updating virtual collection", e); |
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205 | } |
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206 | } |
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207 | |
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208 | public long deleteVirtualCollection(Principal principal, long id) |
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209 | throws VirtualCollectionRegistryException { |
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210 | if (principal == null) { |
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211 | throw new NullPointerException("principal == null"); |
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212 | } |
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213 | if (id <= 0) { |
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214 | throw new IllegalArgumentException("id <= 0"); |
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215 | } |
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216 | |
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217 | logger.debug("deleting virtual collection (id={})", id); |
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218 | |
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219 | try { |
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220 | EntityManager em = datastore.getEntityManager(); |
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221 | em.getTransaction().begin(); |
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222 | VirtualCollection vc = em.find(VirtualCollection.class, |
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223 | Long.valueOf(id), LockModeType.PESSIMISTIC_WRITE); |
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224 | if ((vc == null) || vc.isDeleted()) { |
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225 | logger.debug("virtual collection (id={}) not found", id); |
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226 | throw new VirtualCollectionNotFoundException(id); |
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227 | } |
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228 | if (!isAllowedToModify(principal, vc)) { |
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229 | logger.debug("virtual collection (id={}) not owned by " |
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230 | + "user '{}'", id, principal.getName()); |
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231 | throw new VirtualCollectionRegistryPermissionException( |
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232 | "permission denied for user \"" |
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233 | + principal.getName() + "\""); |
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234 | } |
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235 | if (!vc.isPrivate()) { |
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236 | logger.debug("virtual collection (id={}) cannot be " |
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237 | + "deleted (invalid state)", id); |
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238 | throw new VirtualCollectionRegistryPermissionException( |
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239 | "virtual collection cannot be deleted"); |
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240 | } |
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241 | vc.setState(VirtualCollection.State.DELETED); |
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242 | em.getTransaction().commit(); |
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243 | return vc.getId(); |
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244 | } catch (VirtualCollectionRegistryException e) { |
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245 | logger.debug("failed deleting virtual collecion (id={}): {}", id, |
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246 | e.getMessage()); |
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247 | throw e; |
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248 | } catch (Exception e) { |
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249 | logger.error("error while deleting virtual collection", e); |
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250 | throw new VirtualCollectionRegistryException( |
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251 | "error while deleting virtual collection", e); |
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252 | } |
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253 | } |
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254 | |
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255 | public VirtualCollection.State getVirtualCollectionState(long id) |
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256 | throws VirtualCollectionRegistryException { |
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257 | if (id <= 0) { |
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258 | throw new IllegalArgumentException("id <= 0"); |
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259 | } |
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260 | |
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261 | logger.debug("retrieve virtual collection state (id={})", id); |
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262 | |
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263 | try { |
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264 | EntityManager em = datastore.getEntityManager(); |
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265 | em.getTransaction().begin(); |
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266 | VirtualCollection vc |
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267 | = em.find(VirtualCollection.class, Long.valueOf(id)); |
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268 | em.getTransaction().commit(); |
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269 | if ((vc == null) || vc.isDeleted()) { |
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270 | logger.debug("virtual collection (id={}) not found", id); |
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271 | throw new VirtualCollectionNotFoundException(id); |
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272 | } |
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273 | return vc.getState(); |
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274 | } catch (VirtualCollectionRegistryException e) { |
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275 | throw e; |
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276 | } catch (Exception e) { |
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277 | logger.error( |
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278 | "error while retrieving state of virtual collection", e); |
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279 | throw new VirtualCollectionRegistryException( |
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280 | "error while retrieving state of virtual collection", e); |
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281 | } |
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282 | } |
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283 | |
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284 | public void setVirtualCollectionState(Principal principal, long id, |
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285 | VirtualCollection.State state) |
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286 | throws VirtualCollectionRegistryException { |
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287 | if (principal == null) { |
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288 | throw new NullPointerException("principal == null"); |
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289 | } |
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290 | if (id <= 0) { |
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291 | throw new IllegalArgumentException("id <= 0"); |
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292 | } |
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293 | if (state == null) { |
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294 | throw new NullPointerException("state == null"); |
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295 | } |
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296 | if ((state != VirtualCollection.State.PUBLIC_PENDING) |
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297 | && (state != VirtualCollection.State.PRIVATE)) { |
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298 | throw new IllegalArgumentException( |
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299 | "only PUBLIC_PENDING or PRIVATE are allowed"); |
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300 | } |
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301 | |
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302 | logger.debug("setting state virtual collection state (id={}) to '{}'", |
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303 | id, state); |
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304 | |
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305 | try { |
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306 | EntityManager em = datastore.getEntityManager(); |
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307 | em.getTransaction().begin(); |
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308 | VirtualCollection vc = em.find(VirtualCollection.class, |
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309 | Long.valueOf(id), LockModeType.PESSIMISTIC_WRITE); |
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310 | if ((vc == null) || vc.isDeleted()) { |
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311 | logger.debug("virtual collection (id={}) not found", id); |
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312 | throw new VirtualCollectionNotFoundException(id); |
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313 | } |
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314 | if (!isAllowedToModify(principal, vc)) { |
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315 | logger.debug("virtual collection (id={}) not owned by " |
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316 | + "user '{}'", id, principal.getName()); |
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317 | throw new VirtualCollectionRegistryPermissionException( |
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318 | "permission denied for user \"" |
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319 | + principal.getName() + "\""); |
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320 | } |
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321 | |
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322 | /* |
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323 | * XXX: deny update from public to private? |
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324 | */ |
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325 | boolean update = false; |
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326 | switch (state) { |
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327 | case PRIVATE: |
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328 | update = vc.getState() != state; |
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329 | break; |
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330 | case PUBLIC_PENDING: |
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331 | update = vc.getState() != VirtualCollection.State.PUBLIC; |
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332 | break; |
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333 | default: |
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334 | /* silence warning; update will stay false */ |
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335 | break; |
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336 | } |
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337 | if (update) { |
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338 | vc.setState(state); |
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339 | em.persist(vc); |
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340 | } |
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341 | em.getTransaction().commit(); |
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342 | } catch (VirtualCollectionRegistryException e) { |
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343 | throw e; |
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344 | } catch (Exception e) { |
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345 | logger.error( |
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346 | "error while setting state of virtual collection", e); |
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347 | throw new VirtualCollectionRegistryException( |
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348 | "error while setting state of virtual collection", e); |
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349 | } |
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350 | } |
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351 | |
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352 | /** |
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353 | * |
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354 | * @param id identifier of the virtual collection to retrieve |
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355 | * @return the identified virtual collection, never null |
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356 | * @throws VirtualCollectionRegistryException if no virtual collection with |
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357 | * the specified identifier exists |
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358 | */ |
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359 | public VirtualCollection retrieveVirtualCollection(long id) |
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360 | throws VirtualCollectionRegistryException { |
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361 | if (id <= 0) { |
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362 | throw new IllegalArgumentException("id <= 0"); |
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363 | } |
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364 | |
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365 | logger.debug("retrieve virtual collection (id={})", id); |
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366 | |
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367 | try { |
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368 | EntityManager em = datastore.getEntityManager(); |
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369 | em.getTransaction().begin(); |
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370 | VirtualCollection vc |
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371 | = em.find(VirtualCollection.class, Long.valueOf(id)); |
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372 | em.getTransaction().commit(); |
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373 | if ((vc == null) || vc.isDeleted()) { |
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374 | logger.debug("virtual collection (id={}) not found", id); |
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375 | throw new VirtualCollectionNotFoundException(id); |
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376 | } |
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377 | logger.debug("virtual collection retrieved (id={})", id); |
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378 | return vc; |
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379 | } catch (VirtualCollectionRegistryException e) { |
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380 | throw e; |
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381 | } catch (Exception e) { |
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382 | logger.error("error while retrieving virtual collection", e); |
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383 | throw new VirtualCollectionRegistryException( |
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384 | "error while retrieving virtual collection", e); |
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385 | } |
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386 | } |
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387 | |
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388 | public VirtualCollectionList getVirtualCollections(String query, |
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389 | int offset, int count) throws VirtualCollectionRegistryException { |
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390 | EntityManager em = datastore.getEntityManager(); |
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391 | try { |
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392 | em.getTransaction().begin(); |
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393 | |
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394 | // setup queries |
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395 | TypedQuery<Long> cq = null; |
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396 | TypedQuery<VirtualCollection> q = null; |
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397 | if (query != null) { |
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398 | ParsedQuery parsedQuery = ParsedQuery.parseQuery(query); |
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399 | if (logger.isDebugEnabled()) { |
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400 | logger.debug(parsedQuery.getPrettyPrinted()); |
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401 | } |
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402 | cq = parsedQuery.getCountQuery(em, null, VirtualCollection.State.PUBLIC); |
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403 | q = parsedQuery.getQuery(em, null, VirtualCollection.State.PUBLIC); |
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404 | } else { |
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405 | cq = em.createNamedQuery("VirtualCollection.countAllPublic", |
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406 | Long.class); |
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407 | q = em.createNamedQuery("VirtualCollection.findAllPublic", |
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408 | VirtualCollection.class); |
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409 | } |
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410 | |
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411 | // commence query ... |
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412 | List<VirtualCollection> results = null; |
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413 | long totalCount = cq.getSingleResult(); |
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414 | |
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415 | // optimization; don't query, if we won't get any results |
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416 | /* |
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417 | * FIXME: offset == -1 is temporary hack for just fetching |
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418 | * total count; re-factor to have fetch-count and fetch-data |
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419 | * methods! |
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420 | */ |
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421 | if ((totalCount > 0) && (offset > -1)) { |
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422 | if (offset > 0) { |
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423 | q.setFirstResult(offset); |
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424 | } |
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425 | if (count > 0) { |
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426 | q.setMaxResults(count); |
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427 | } |
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428 | results = q.getResultList(); |
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429 | } |
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430 | return new VirtualCollectionList(results, offset, (int) totalCount); |
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431 | } catch (Exception e) { |
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432 | logger.error("error while enumerating virtual collections", e); |
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433 | throw new VirtualCollectionRegistryException( |
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434 | "error while enumerating virtual collections", e); |
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435 | } finally { |
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436 | EntityTransaction tx = em.getTransaction(); |
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437 | if ((tx != null) && !tx.getRollbackOnly()) { |
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438 | tx.commit(); |
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439 | } |
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440 | } |
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441 | } |
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442 | |
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443 | public VirtualCollectionList getVirtualCollections(Principal principal, |
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444 | String query, int offset, int count) |
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445 | throws VirtualCollectionRegistryException { |
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446 | if (principal == null) { |
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447 | throw new NullPointerException("principal == null"); |
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448 | } |
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449 | EntityManager em = datastore.getEntityManager(); |
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450 | try { |
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451 | List<VirtualCollection> results = null; |
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452 | long totalCount = 0; |
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453 | |
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454 | em.getTransaction().begin(); |
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455 | |
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456 | /* |
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457 | * fetch user. if user is not found, he has not yet registered any |
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458 | * virtual collections, so just return an empty list |
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459 | */ |
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460 | User user = fetchUser(em, principal); |
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461 | if (user != null) { |
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462 | // setup queries |
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463 | TypedQuery<Long> cq = null; |
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464 | TypedQuery<VirtualCollection> q = null; |
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465 | if (query != null) { |
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466 | ParsedQuery parsedQuery = ParsedQuery.parseQuery(query); |
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467 | if (logger.isDebugEnabled()) { |
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468 | logger.debug(parsedQuery.getPrettyPrinted()); |
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469 | } |
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470 | cq = parsedQuery.getCountQuery(em, user, null); |
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471 | q = parsedQuery.getQuery(em, user, null); |
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472 | } else { |
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473 | cq = em.createNamedQuery("VirtualCollection.countByOwner", |
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474 | Long.class); |
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475 | cq.setParameter("owner", user); |
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476 | q = em.createNamedQuery("VirtualCollection.findByOwner", |
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477 | VirtualCollection.class); |
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478 | q.setParameter("owner", user); |
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479 | } |
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480 | |
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481 | // commence query ... |
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482 | totalCount = cq.getSingleResult(); |
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483 | |
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484 | // optimization; don't query, if we won't get any results |
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485 | /* |
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486 | * FIXME: offset == -1 is temporary hack for just fetching |
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487 | * total count; re-factor to have fetch-count and fetch-data |
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488 | * methods! |
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489 | */ |
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490 | if ((totalCount > 0) && (offset > -1)) { |
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491 | if (offset > 0) { |
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492 | q.setFirstResult(offset); |
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493 | } |
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494 | if (count > 0) { |
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495 | q.setMaxResults(count); |
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496 | } |
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497 | results = q.getResultList(); |
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498 | } |
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499 | } |
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500 | return new VirtualCollectionList(results, offset, (int) totalCount); |
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501 | } catch (Exception e) { |
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502 | logger.error("error while enumerating virtual collections", e); |
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503 | throw new VirtualCollectionRegistryException( |
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504 | "error while enumerating virtual collections", e); |
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505 | } finally { |
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506 | EntityTransaction tx = em.getTransaction(); |
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507 | if ((tx != null) && !tx.getRollbackOnly()) { |
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508 | tx.commit(); |
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509 | } |
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510 | } |
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511 | } |
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512 | |
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513 | public int getVirtualCollectionCount(QueryOptions options) |
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514 | throws VirtualCollectionRegistryException { |
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515 | logger.trace("Getting virtual collection count"); |
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516 | EntityManager em = datastore.getEntityManager(); |
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517 | try { |
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518 | CriteriaBuilder cb = em.getCriteriaBuilder(); |
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519 | CriteriaQuery<Long> cq = cb.createQuery(Long.class); |
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520 | Root<VirtualCollection> root = cq.from(VirtualCollection.class); |
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521 | if (options != null) { |
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522 | Predicate where = options.getWhere(cb, cq, root); |
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523 | if (where != null) { |
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524 | cq.where(where); |
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525 | } |
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526 | } |
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527 | em.getTransaction().begin(); |
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528 | TypedQuery<Long> query |
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529 | = em.createQuery(cq.select(cb.count(root))); |
---|
530 | final long count = query.getSingleResult(); |
---|
531 | if (count >= Integer.MAX_VALUE) { |
---|
532 | throw new VirtualCollectionRegistryException( |
---|
533 | "resultset too large"); |
---|
534 | } |
---|
535 | logger.trace("Counted {} collections", count); |
---|
536 | return (int) count; |
---|
537 | } catch (Exception e) { |
---|
538 | logger.error("error while counting virtual collections", e); |
---|
539 | throw new VirtualCollectionRegistryException( |
---|
540 | "error while counting virtual collections", e); |
---|
541 | } finally { |
---|
542 | EntityTransaction tx = em.getTransaction(); |
---|
543 | if ((tx != null) && tx.isActive() && !tx.getRollbackOnly()) { |
---|
544 | tx.commit(); |
---|
545 | } |
---|
546 | } |
---|
547 | } |
---|
548 | |
---|
549 | public List<User> getUsers() { |
---|
550 | final EntityManager em = datastore.getEntityManager(); |
---|
551 | try { |
---|
552 | final CriteriaBuilder cb = em.getCriteriaBuilder(); |
---|
553 | final CriteriaQuery<User> cq = cb.createQuery(User.class); |
---|
554 | final Root<User> root = cq.from(User.class); |
---|
555 | |
---|
556 | // select all users, sort by display name then name |
---|
557 | cq.select(root); |
---|
558 | cq.orderBy( |
---|
559 | cb.asc(root.get(User_.displayName)), |
---|
560 | cb.asc(root.get(User_.name))); |
---|
561 | |
---|
562 | em.getTransaction().begin(); |
---|
563 | final TypedQuery<User> query = em.createQuery(cq); |
---|
564 | return query.getResultList(); |
---|
565 | } finally { |
---|
566 | EntityTransaction tx = em.getTransaction(); |
---|
567 | if ((tx != null) && tx.isActive() && !tx.getRollbackOnly()) { |
---|
568 | tx.commit(); |
---|
569 | } |
---|
570 | } |
---|
571 | } |
---|
572 | |
---|
573 | public List<VirtualCollection> getVirtualCollections( |
---|
574 | int first, int count, QueryOptions options) |
---|
575 | throws VirtualCollectionRegistryException { |
---|
576 | EntityManager em = datastore.getEntityManager(); |
---|
577 | try { |
---|
578 | CriteriaBuilder cb = em.getCriteriaBuilder(); |
---|
579 | CriteriaQuery<VirtualCollection> cq |
---|
580 | = cb.createQuery(VirtualCollection.class); |
---|
581 | Root<VirtualCollection> root = cq.from(VirtualCollection.class); |
---|
582 | if (options != null) { |
---|
583 | final Predicate where = options.getWhere(cb, cq, root); |
---|
584 | if (where != null) { |
---|
585 | cq.where(where); |
---|
586 | } |
---|
587 | final Order[] order = options.getOrderBy(cb, root); |
---|
588 | if (order != null) { |
---|
589 | cq.orderBy(order); |
---|
590 | } |
---|
591 | } |
---|
592 | em.getTransaction().begin(); |
---|
593 | TypedQuery<VirtualCollection> query |
---|
594 | = em.createQuery(cq.select(root)); |
---|
595 | if (first > -1) { |
---|
596 | query.setFirstResult(first); |
---|
597 | } |
---|
598 | if (count > 0) { |
---|
599 | query.setMaxResults(count); |
---|
600 | } |
---|
601 | return query.getResultList(); |
---|
602 | } catch (Exception e) { |
---|
603 | logger.error("error while fetching virtual collections", e); |
---|
604 | throw new VirtualCollectionRegistryException( |
---|
605 | "error while fetching virtual collections", e); |
---|
606 | } finally { |
---|
607 | EntityTransaction tx = em.getTransaction(); |
---|
608 | if ((tx != null) && tx.isActive() && !tx.getRollbackOnly()) { |
---|
609 | tx.commit(); |
---|
610 | } |
---|
611 | } |
---|
612 | } |
---|
613 | |
---|
614 | private void maintenance(long now) { |
---|
615 | logger.debug("Maintenance check"); |
---|
616 | // allocate persistent identifier roughly after 30 seconds |
---|
617 | final Date nowDateAlloc = new Date(now - 30 * 1000); |
---|
618 | // (for now) purge deleted collection roughly after 30 seconds |
---|
619 | final Date nowDatePurge = new Date(now - 30 * 1000); |
---|
620 | |
---|
621 | EntityManager em = datastore.getEntityManager(); |
---|
622 | try { |
---|
623 | /* |
---|
624 | * delayed allocation of persistent identifier |
---|
625 | */ |
---|
626 | em.getTransaction().begin(); |
---|
627 | TypedQuery<VirtualCollection> q |
---|
628 | = em.createNamedQuery("VirtualCollection.findAllByState", |
---|
629 | VirtualCollection.class); |
---|
630 | q.setParameter("state", VirtualCollection.State.PUBLIC_PENDING); |
---|
631 | q.setParameter("date", nowDateAlloc); |
---|
632 | q.setLockMode(LockModeType.PESSIMISTIC_WRITE); |
---|
633 | for (VirtualCollection vc : q.getResultList()) { |
---|
634 | if (vc.getPersistentIdentifier() == null) { |
---|
635 | PersistentIdentifier pid = pid_provider.createIdentifier(vc); |
---|
636 | vc.setPersistentIdentifier(pid); |
---|
637 | } |
---|
638 | vc.setState(VirtualCollection.State.PUBLIC); |
---|
639 | em.persist(vc); |
---|
640 | logger.info("assigned pid (identifer='{}') to virtual" |
---|
641 | + "collection (id={})", |
---|
642 | vc.getPersistentIdentifier().getIdentifier(), |
---|
643 | vc.getId()); |
---|
644 | } |
---|
645 | em.getTransaction().commit(); |
---|
646 | |
---|
647 | /* |
---|
648 | * delayed purging of deleted virtual collections |
---|
649 | */ |
---|
650 | em.getTransaction().begin(); |
---|
651 | q.setParameter("state", VirtualCollection.State.DELETED); |
---|
652 | q.setParameter("date", nowDatePurge); |
---|
653 | q.setLockMode(LockModeType.PESSIMISTIC_WRITE); |
---|
654 | for (VirtualCollection vc : q.getResultList()) { |
---|
655 | vc.setState(VirtualCollection.State.DEAD); |
---|
656 | em.remove(vc); |
---|
657 | logger.debug("purged virtual collection (id={})", vc.getId()); |
---|
658 | } |
---|
659 | em.getTransaction().commit(); |
---|
660 | } catch (VirtualCollectionRegistryException e) { |
---|
661 | logger.error("error while doing maintenance", e); |
---|
662 | } finally { |
---|
663 | datastore.closeEntityManager(); |
---|
664 | } |
---|
665 | } |
---|
666 | |
---|
667 | private static User fetchUser(EntityManager em, Principal principal) { |
---|
668 | User user = null; |
---|
669 | try { |
---|
670 | TypedQuery<User> q |
---|
671 | = em.createNamedQuery("User.findByName", User.class); |
---|
672 | q.setParameter("name", principal.getName()); |
---|
673 | user = q.getSingleResult(); |
---|
674 | } catch (NoResultException e) { |
---|
675 | /* IGNORE */ |
---|
676 | } |
---|
677 | return user; |
---|
678 | } |
---|
679 | |
---|
680 | /** |
---|
681 | * Creates a single thread scheduled executor with the specified thread name |
---|
682 | * |
---|
683 | * @param threadName name for new executor threads |
---|
684 | * @return |
---|
685 | */ |
---|
686 | private static ScheduledExecutorService createSingleThreadScheduledExecutor(final String threadName) { |
---|
687 | return Executors.newSingleThreadScheduledExecutor(new ThreadFactory() { |
---|
688 | // decorate default thread factory so that we can provide a |
---|
689 | // custom thread name |
---|
690 | final AtomicInteger i = new AtomicInteger(0); |
---|
691 | |
---|
692 | @Override |
---|
693 | public Thread newThread(Runnable r) { |
---|
694 | final Thread thread = Executors.defaultThreadFactory().newThread(r); |
---|
695 | thread.setName(threadName + "-" + i.addAndGet(1)); |
---|
696 | return thread; |
---|
697 | } |
---|
698 | }); |
---|
699 | } |
---|
700 | |
---|
701 | private boolean isAllowedToModify(Principal principal, VirtualCollection c) { |
---|
702 | // admin and owner are allowed to modify collections |
---|
703 | return adminUsersService.isAdmin(principal.getName()) |
---|
704 | || c.getOwner().equalsPrincipal(principal); |
---|
705 | } |
---|
706 | |
---|
707 | } // class VirtualCollectionRegistry |
---|