Exemplo n.º 1
0
 /**
  * INTERNAL: Execute the query. If there are cached results return those. This must override the
  * super to support result caching.
  *
  * @param session - the session in which the receiver will be executed.
  * @return An object or vector, the result of executing the query.
  * @exception DatabaseException - an error has occurred on the database
  */
 public Object execute(AbstractSession session, AbstractRecord row) throws DatabaseException {
   if (shouldCacheQueryResults()) {
     if (getContainerPolicy().overridesRead()) {
       throw QueryException.cannotCacheCursorResultsOnQuery(this);
     }
     if (shouldConformResultsInUnitOfWork()) {
       throw QueryException.cannotConformAndCacheQueryResults(this);
     }
     if (isPrepared()) { // only prepared queries can have cached results.
       Object queryResults = getQueryResults(session, row, true);
       if (queryResults != null) {
         if (QueryMonitor.shouldMonitor()) {
           QueryMonitor.incrementReadAllHits(this);
         }
         // bug6138532 - check for "cached no results" (InvalidObject singleton) in query
         // results, and return an empty container instance as configured
         if (queryResults == InvalidObject.instance) {
           return getContainerPolicy().containerInstance(0);
         }
         Collection results = (Collection) queryResults;
         if (session.isUnitOfWork()) {
           ContainerPolicy policy = getContainerPolicy();
           Object resultCollection = policy.containerInstance(results.size());
           Object iterator = policy.iteratorFor(results);
           while (policy.hasNext(iterator)) {
             Object result =
                 ((UnitOfWorkImpl) session)
                     .registerExistingObject(policy.next(iterator, session), this.descriptor);
             policy.addInto(result, resultCollection, session);
           }
           return resultCollection;
         }
         return results;
       }
     }
   }
   if (QueryMonitor.shouldMonitor()) {
     QueryMonitor.incrementReadAllMisses(this);
   }
   return super.execute(session, row);
 }
  /**
   * INTERNAL: Perform the work to delete an object.
   *
   * @return object - the object being deleted.
   */
  public Object executeDatabaseQuery() throws DatabaseException, OptimisticLockException {
    AbstractSession session = getSession();
    CommitManager commitManager = session.getCommitManager();
    Object object = getObject();
    boolean isUnitOfWork = session.isUnitOfWork();
    try {
      // Check if the object has already been committed, then no work is required
      if (commitManager.isProcessedCommit(object)) {
        return object;
      }
      commitManager.markPreModifyCommitInProgress(getObject());
      if (!isUnitOfWork) {
        session.beginTransaction();
      }
      ClassDescriptor descriptor = this.descriptor;
      DescriptorEventManager eventManager = descriptor.getEventManager();
      // PERF: Avoid events if no listeners.
      if (eventManager.hasAnyEventListeners()) {
        // Need to run pre-delete selector if available
        eventManager.executeEvent(new DescriptorEvent(DescriptorEventManager.PreDeleteEvent, this));
      }

      // Verify if deep shallow modify is turned on
      if (shouldCascadeParts()) {
        descriptor.getQueryManager().preDelete(this);
      }

      // CR#2660080 missing aboutToDelete event.
      // PERF: Avoid events if no listeners.
      if (eventManager.hasAnyEventListeners()) {
        DescriptorEvent event =
            new DescriptorEvent(DescriptorEventManager.AboutToDeleteEvent, this);
        event.setRecord(getModifyRow());
        eventManager.executeEvent(event);
      }

      if (QueryMonitor.shouldMonitor()) {
        QueryMonitor.incrementDelete(this);
      }
      int rowCount = 0;
      // If the object was/will be deleted from a cascade delete constraint, ignore it.
      if (isUnitOfWork
          && ((UnitOfWorkImpl) session).hasCascadeDeleteObjects()
          && ((UnitOfWorkImpl) session).getCascadeDeleteObjects().contains(object)) {
        // Cascade delete does not check optimistic lock, assume ok.
        rowCount = 1;
      } else {
        rowCount = getQueryMechanism().deleteObject().intValue();
      }

      if (rowCount < 1) {
        if (session.hasEventManager()) {
          session.getEventManager().noRowsModified(this, object);
        }
      }

      if (descriptor.usesOptimisticLocking()) {
        descriptor.getOptimisticLockingPolicy().validateDelete(rowCount, object, this);
      }

      commitManager.markPostModifyCommitInProgress(getObject());
      // Verify if deep shallow modify is turned on
      if (shouldCascadeParts()) {
        descriptor.getQueryManager().postDelete(this);
      }

      if ((descriptor.getHistoryPolicy() != null)
          && descriptor.getHistoryPolicy().shouldHandleWrites()) {
        descriptor.getHistoryPolicy().postDelete(this);
      }

      // PERF: Avoid events if no listeners.
      if (eventManager.hasAnyEventListeners()) {
        // Need to run post-delete selector if available
        eventManager.executeEvent(
            new DescriptorEvent(DescriptorEventManager.PostDeleteEvent, this));
      }

      if (!isUnitOfWork) {
        session.commitTransaction();
      }
      commitManager.markCommitCompleted(object);

      // CR3510313, avoid removing aggregate collections from cache (maintain cache is false).
      if (shouldMaintainCache()) {
        if (isUnitOfWork) {
          ((UnitOfWorkImpl) session).addObjectDeletedDuringCommit(object, descriptor);
        } else {
          session
              .getIdentityMapAccessorInstance()
              .removeFromIdentityMap(
                  getPrimaryKey(), descriptor.getJavaClass(), descriptor, object);
        }
      }
      return object;

    } catch (RuntimeException exception) {
      if (!isUnitOfWork) {
        session.rollbackTransaction();
      }
      commitManager.markCommitCompleted(object);
      throw exception;
    }
  }
  /**
   * INTERNAL: Perform the work to delete an object.
   *
   * @return object - the object being deleted.
   */
  public Object executeDatabaseQuery() throws DatabaseException, OptimisticLockException {
    AbstractSession session = getSession();
    CommitManager commitManager = session.getCommitManager();
    Object object = getObject();
    boolean isUnitOfWork = session.isUnitOfWork();
    try {
      // Check if the object has already been deleted, then no work is required.
      if (commitManager.isCommitCompletedInPostOrIgnore(object)) {
        return object;
      }
      ClassDescriptor descriptor = this.descriptor;
      // Check whether the object is already being deleted,
      // if it is, then there is a cycle, and the foreign keys must be nulled.
      if (commitManager.isCommitInPreModify(object)) {
        if (!commitManager.isShallowCommitted(object)) {
          getQueryMechanism().updateForeignKeyFieldBeforeDelete();
          if ((descriptor.getHistoryPolicy() != null)
              && descriptor.getHistoryPolicy().shouldHandleWrites()) {
            descriptor.getHistoryPolicy().postUpdate(this);
          }
          commitManager.markShallowCommit(object);
        }
        return object;
      }
      commitManager.markPreModifyCommitInProgress(getObject());
      if (!isUnitOfWork) {
        session.beginTransaction();
      }
      DescriptorEventManager eventManager = descriptor.getEventManager();
      // PERF: Avoid events if no listeners.
      if (eventManager.hasAnyEventListeners()) {
        // Need to run pre-delete selector if available
        eventManager.executeEvent(new DescriptorEvent(DescriptorEventManager.PreDeleteEvent, this));
      }

      // Verify if deep shallow modify is turned on
      if (shouldCascadeParts()) {
        descriptor.getQueryManager().preDelete(this);
      }

      // Check for deletion dependencies.
      if (isUnitOfWork) {
        Set dependencies = ((UnitOfWorkImpl) session).getDeletionDependencies(object);
        if (dependencies != null) {
          for (Object dependency : dependencies) {
            if (!commitManager.isCommitCompletedInPostOrIgnore(dependency)) {
              ClassDescriptor dependencyDescriptor = session.getDescriptor(dependency);
              // PERF: Get the descriptor query, to avoid extra query creation.
              DeleteObjectQuery deleteQuery =
                  dependencyDescriptor.getQueryManager().getDeleteQuery();
              if (deleteQuery == null) {
                deleteQuery = new DeleteObjectQuery();
                deleteQuery.setDescriptor(dependencyDescriptor);
              } else {
                // Ensure original query has been prepared.
                deleteQuery.checkPrepare(session, deleteQuery.getTranslationRow());
                deleteQuery = (DeleteObjectQuery) deleteQuery.clone();
              }
              deleteQuery.setIsExecutionClone(true);
              deleteQuery.setObject(dependency);
              session.executeQuery(deleteQuery);
            }
          }
        }
      }

      // CR#2660080 missing aboutToDelete event.
      // PERF: Avoid events if no listeners.
      if (eventManager.hasAnyEventListeners()) {
        DescriptorEvent event =
            new DescriptorEvent(DescriptorEventManager.AboutToDeleteEvent, this);
        event.setRecord(getModifyRow());
        eventManager.executeEvent(event);
      }

      if (QueryMonitor.shouldMonitor()) {
        QueryMonitor.incrementDelete(this);
      }
      int rowCount = 0;
      // If the object was/will be deleted from a cascade delete constraint, ignore it.
      if (isUnitOfWork
          && ((UnitOfWorkImpl) session).hasCascadeDeleteObjects()
          && ((UnitOfWorkImpl) session).getCascadeDeleteObjects().contains(object)) {
        // Cascade delete does not check optimistic lock, assume ok.
        rowCount = 1;
      } else {
        rowCount = getQueryMechanism().deleteObject().intValue();
      }

      if (rowCount < 1) {
        if (session.hasEventManager()) {
          session.getEventManager().noRowsModified(this, object);
        }
      }

      if (this.usesOptimisticLocking) {
        descriptor.getOptimisticLockingPolicy().validateDelete(rowCount, object, this);
      }

      commitManager.markPostModifyCommitInProgress(getObject());
      // Verify if deep shallow modify is turned on
      if (shouldCascadeParts()) {
        descriptor.getQueryManager().postDelete(this);
      }

      if ((descriptor.getHistoryPolicy() != null)
          && descriptor.getHistoryPolicy().shouldHandleWrites()) {
        descriptor.getHistoryPolicy().postDelete(this);
      }

      // PERF: Avoid events if no listeners.
      if (eventManager.hasAnyEventListeners()) {
        // Need to run post-delete selector if available
        eventManager.executeEvent(
            new DescriptorEvent(DescriptorEventManager.PostDeleteEvent, this));
      }

      if (!isUnitOfWork) {
        session.commitTransaction();
      }
      commitManager.markCommitCompleted(object);

      // CR3510313, avoid removing aggregate collections from cache (maintain cache is false).
      if (shouldMaintainCache()) {
        if (isUnitOfWork) {
          ((UnitOfWorkImpl) session).addObjectDeletedDuringCommit(object, descriptor);
        } else {
          session
              .getIdentityMapAccessorInstance()
              .removeFromIdentityMap(
                  getPrimaryKey(), descriptor.getJavaClass(), descriptor, object);
        }
      }
      return object;

    } catch (RuntimeException exception) {
      if (!isUnitOfWork) {
        session.rollbackTransaction();
      }
      commitManager.markCommitCompleted(object);
      throw exception;
    }
  }