org.jboss.as.jpa.container.ExtendedEntityManager java code examples

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/**
 * The JPA SFSB interceptor will track the stack of SFSB invocations.  The underlying EM will be obtained from
 * the current SFSB being invoked (via our JPA SFSB interceptor).
 *
 * Every entity manager call (to AbstractEntityManager) will call this method to get the underlying entity manager
 * (e.g. the Hibernate persistence provider).
 *
 * See org.jboss.ejb3.stateful.EJB3XPCResolver.getExtendedPersistenceContext() to see the as6 implementation of this.
 *
 * @return EntityManager
 */
@Override
protected EntityManager getEntityManager() {
  internalAssociateWithJtaTx();
  return underlyingEntityManager;
}

  entityManager1 = new ExtendedEntityManager(unitName, emf.createEntityManager(synchronizationType, properties), synchronizationType, tsr, transactionManager);
  entityManager1 = new ExtendedEntityManager(unitName, emf.createEntityManager(properties), synchronizationType, tsr, transactionManager);
entityManager1.increaseReferenceCount();
if (ROOT_LOGGER.isDebugEnabled())
  ROOT_LOGGER.debugf("inherited existing ExtendedEntityManager from SFSB invocation stack, unit name=%s, " +
      "%d beans sharing ExtendedEntityManager, useDeepInheritance = %b", unitName, entityManager1.getReferenceCount(), useDeepInheritance);

public synchronized void refCountedClose() {
  referenceCount--;
  if (referenceCount == 0) {
    if (underlyingEntityManager.isOpen()) {
      underlyingEntityManager.close();
      if (isTraceEnabled) {
        ROOT_LOGGER.tracef("closed extended persistence context (%s)", puScopedName);
      }
    }
  }
  else if (isTraceEnabled) {
    ROOT_LOGGER.tracef("decremented extended persistence context (%s) owner count to %d",
        puScopedName, referenceCount);
  }
  // referenceCount should never be negative, if it is we need to fix the bug that caused it to decrement too much
  if (referenceCount < 0) {
    throw JpaLogger.ROOT_LOGGER.referenceCountedEntityManagerNegativeCount(referenceCount, getScopedPuName());
  }
}

  @Override
  public Object processInvocation(InterceptorContext interceptorContext) throws Exception {
    final ComponentInstance componentInstance = interceptorContext.getPrivateData(ComponentInstance.class);
    try {
      return interceptorContext.proceed();
    } finally {
      ManagedReference entityManagerRef = (ManagedReference) componentInstance.getInstanceData(SFSBInvocationInterceptor.CONTEXT_KEY);
      if(entityManagerRef != null) {
        Map<String, ExtendedEntityManager> entityManagers = (Map<String, ExtendedEntityManager>) entityManagerRef.getInstance();
        for(Map.Entry<String, ExtendedEntityManager> entry : entityManagers.entrySet()) {
          // close all extended persistence contexts that are referenced by the bean being destroyed
          entry.getValue().refCountedClose();
        }
      }
    }
  }
}

  entityManager1 = new ExtendedEntityManager(unitName, emf.createEntityManager(synchronizationType, properties), synchronizationType, tsr, transactionManager);
  entityManager1 = new ExtendedEntityManager(unitName, emf.createEntityManager(properties), synchronizationType, tsr, transactionManager);
entityManager1.increaseReferenceCount();
if (ROOT_LOGGER.isDebugEnabled())
  ROOT_LOGGER.debugf("inherited existing ExtendedEntityManager from SFSB invocation stack, unit name=%s, " +
      "%d beans sharing ExtendedEntityManager, useDeepInheritance = %b", unitName, entityManager1.getReferenceCount(), useDeepInheritance);

public synchronized void refCountedClose() {
  referenceCount--;
  if (referenceCount == 0) {
    if (underlyingEntityManager.isOpen()) {
      underlyingEntityManager.close();
      if (isTraceEnabled) {
        ROOT_LOGGER.tracef("closed extended persistence context (%s)", puScopedName);
      }
    }
  }
  else if (isTraceEnabled) {
    ROOT_LOGGER.tracef("decremented extended persistence context (%s) owner count to %d",
        puScopedName, referenceCount);
  }
  // referenceCount should never be negative, if it is we need to fix the bug that caused it to decrement too much
  if (referenceCount < 0) {
    throw JpaLogger.ROOT_LOGGER.referenceCountedEntityManagerNegativeCount(referenceCount, getScopedPuName());
  }
}

  @Override
  public Object processInvocation(InterceptorContext interceptorContext) throws Exception {
    final ComponentInstance componentInstance = interceptorContext.getPrivateData(ComponentInstance.class);
    try {
      return interceptorContext.proceed();
    } finally {
      ManagedReference entityManagerRef = (ManagedReference) componentInstance.getInstanceData(SFSBInvocationInterceptor.CONTEXT_KEY);
      if(entityManagerRef != null) {
        Map<String, ExtendedEntityManager> entityManagers = (Map<String, ExtendedEntityManager>) entityManagerRef.getInstance();
        for(Map.Entry<String, ExtendedEntityManager> entry : entityManagers.entrySet()) {
          // close all extended persistence contexts that are referenced by the bean being destroyed
          entry.getValue().refCountedClose();
        }
      }
    }
  }
}

/**
 * The JPA SFSB interceptor will track the stack of SFSB invocations.  The underlying EM will be obtained from
 * the current SFSB being invoked (via our JPA SFSB interceptor).
 *
 * Every entity manager call (to AbstractEntityManager) will call this method to get the underlying entity manager
 * (e.g. the Hibernate persistence provider).
 *
 * See org.jboss.ejb3.stateful.EJB3XPCResolver.getExtendedPersistenceContext() to see the as6 implementation of this.
 *
 * @return EntityManager
 */
@Override
protected EntityManager getEntityManager() {
  internalAssociateWithJtaTx();
  return underlyingEntityManager;
}

  @Override
  public Object processInvocation(InterceptorContext interceptorContext) throws Exception {
    ComponentInstance componentInstance = interceptorContext.getPrivateData(ComponentInstance.class);
    Map<String, ExtendedEntityManager> entityManagers = null;
    if(componentInstance.getInstanceData(SFSBInvocationInterceptor.CONTEXT_KEY) == null) {
      // Get all of the extended persistence contexts in use by the bean (some of which may of been inherited from
      // other beans).
      entityManagers = new HashMap<String, ExtendedEntityManager>();
      componentInstance.setInstanceData(SFSBInvocationInterceptor.CONTEXT_KEY, new ImmediateManagedReference(entityManagers));
    } else {
      ManagedReference entityManagerRef = (ManagedReference) componentInstance.getInstanceData(SFSBInvocationInterceptor.CONTEXT_KEY);
      entityManagers = (Map<String, ExtendedEntityManager>)entityManagerRef.getInstance();
    }
    final ExtendedEntityManager[] ems = CreatedEntityManagers.getDeferredEntityManagers();
    for (ExtendedEntityManager e : ems) {
      entityManagers.put(e.getScopedPuName(), e);
    }
    return interceptorContext.proceed();
  }
}

  @Override
  public void userTransactionStarted() throws SystemException {

    Map<String, ExtendedEntityManager> currentActiveEntityManagers = SFSBCallStack.currentSFSBCallStackInvocation();
    if (currentActiveEntityManagers != null && currentActiveEntityManagers.size() > 0) {
      for (ExtendedEntityManager extendedEntityManager: currentActiveEntityManagers.values()) {
        extendedEntityManager.internalAssociateWithJtaTx();
      }
    }
  }
}

  @Override
  public Object processInvocation(InterceptorContext interceptorContext) throws Exception {
    ComponentInstance componentInstance = interceptorContext.getPrivateData(ComponentInstance.class);
    Map<String, ExtendedEntityManager> entityManagers = null;
    if(componentInstance.getInstanceData(SFSBInvocationInterceptor.CONTEXT_KEY) == null) {
      // Get all of the extended persistence contexts in use by the bean (some of which may of been inherited from
      // other beans).
      entityManagers = new HashMap<String, ExtendedEntityManager>();
      componentInstance.setInstanceData(SFSBInvocationInterceptor.CONTEXT_KEY, new ImmediateManagedReference(entityManagers));
    } else {
      ManagedReference entityManagerRef = (ManagedReference) componentInstance.getInstanceData(SFSBInvocationInterceptor.CONTEXT_KEY);
      entityManagers = (Map<String, ExtendedEntityManager>)entityManagerRef.getInstance();
    }
    final ExtendedEntityManager[] ems = CreatedEntityManagers.getDeferredEntityManagers();
    for (ExtendedEntityManager e : ems) {
      entityManagers.put(e.getScopedPuName(), e);
    }
    return interceptorContext.proceed();
  }
}

  @Override
  public void userTransactionStarted() throws SystemException {

    Map<String, ExtendedEntityManager> currentActiveEntityManagers = SFSBCallStack.currentSFSBCallStackInvocation();
    if (currentActiveEntityManagers != null && currentActiveEntityManagers.size() > 0) {
      for (ExtendedEntityManager extendedEntityManager: currentActiveEntityManagers.values()) {
        extendedEntityManager.internalAssociateWithJtaTx();
      }
    }
  }
}

/**
 * Push the passed SFSB context handle onto the invocation call stack
 *
 * @param entityManagers the entity manager map
 */
public static void pushCall(Map<String, ExtendedEntityManager> entityManagers) {
  currentSFSBCallStack().add(entityManagers);
  if (entityManagers != null) {
    /**
     * JPA 2.0 spec section 7.9.1 Container Responsibilities:
     * "When a business method of the stateful session bean is invoked,
     *  if the stateful session bean uses container managed transaction demarcation,
     *  and the entity manager is not already associated with the current JTA transaction,
     *  the container associates the entity manager with the current JTA transaction and
     *  calls EntityManager.joinTransaction.
     *  "
     */
    for(ExtendedEntityManager extendedEntityManager: entityManagers.values()) {
      extendedEntityManager.internalAssociateWithJtaTx();
    }
  }
}

/**
 * Push the passed SFSB context handle onto the invocation call stack
 *
 * @param entityManagers the entity manager map
 */
public static void pushCall(Map<String, ExtendedEntityManager> entityManagers) {
  currentSFSBCallStack().add(entityManagers);
  if (entityManagers != null) {
    /**
     * JPA 2.0 spec section 7.9.1 Container Responsibilities:
     * "When a business method of the stateful session bean is invoked,
     *  if the stateful session bean uses container managed transaction demarcation,
     *  and the entity manager is not already associated with the current JTA transaction,
     *  the container associates the entity manager with the current JTA transaction and
     *  calls EntityManager.joinTransaction.
     *  "
     */
    for(ExtendedEntityManager extendedEntityManager: entityManagers.values()) {
      extendedEntityManager.internalAssociateWithJtaTx();
    }
  }
}

Javadoc

Represents the Extended persistence context injected into a stateful bean. At bean invocation time, will join the active JTA transaction if one is present. If no active JTA transaction is present, created/deleted/updated/loaded entities will remain associated with the entity manager until it is joined with a transaction (commit will save the changes, rollback will lose them).

At injection time, an instance of this class is associated with the SFSB. During a SFSB1 invocation, if a new SFSB2 is created with an XPC referencing the same persistence unit, the new SFSB2 will inherit the same persistence context from SFSB1. Both SFSB1 + SFSB2 will maintain a reference to the underlying persistence context, such that the underlying persistence context will be kept around until both SFSB1 + SFSB2 are destroyed. At cluster replication time or passivation, both SFSB1 + SFSB2 will be serialized consecutively and this instance will only be serialized once.

Note: Unlike TransactionScopedEntityManager, ExtendedEntityManager will directly be shared instead of the underlying EntityManager.

During serialization, A NotSerializableException will be thrown if the following conditions are not met: - The underlying persistence provider (entity manager) must be Serializable. - The entity classes in the extended persistence context must also be Serializable.

Most used methods

<init>
getReferenceCount
getScopedPuName
Get the fully application scoped persistence unit name Private api
increaseReferenceCount
Start of reference count handling. synchronize on *this* to protect access to the referenceCount (sh
internalAssociateWithJtaTx
Associate the extended persistence context with the current JTA transaction (if one is found) this m
refCountedClose

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How to useExtendedEntityManager in org.jboss.as.jpa.container

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