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javax.ejb
public interface: SessionSynchronization [javadoc | source]

The SessionSynchronization interface allows a session Bean instance to be notified by its container of transaction boundaries.

An session Bean class is not required to implement this interface. A session Bean class should implement this interface only if it wishes to synchronize its state with the transactions.

Method from javax.ejb.SessionSynchronization Summary:
afterBegin,   afterCompletion,   beforeCompletion
Method from javax.ejb.SessionSynchronization Detail:
 public  void afterBegin() throws EJBException, RemoteException

    The afterBegin method notifies a session Bean instance that a new transaction has started, and that the subsequent business methods on the instance will be invoked in the context of the transaction.

    The instance can use this method, for example, to read data from a database and cache the data in the instance fields.

    This method executes in the proper transaction context.

 public  void afterCompletion(boolean committed) throws EJBException, RemoteException

    The afterCompletion method notifies a session Bean instance that a transaction commit protocol has completed, and tells the instance whether the transaction has been committed or rolled back.

    This method executes with no transaction context.

    This method executes with no transaction context.

 public  void beforeCompletion() throws EJBException, RemoteException

    The beforeCompletion method notifies a session Bean instance that a transaction is about to be committed. The instance can use this method, for example, to write any cached data to a database.

    This method executes in the proper transaction context.

    Note: The instance may still cause the container to rollback the transaction by invoking the setRollbackOnly() method on the instance context, or by throwing an exception.