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package javax.ejb;
import java.rmi.RemoteException;
/**
* <p> The SessionSynchronization interface allows a stateful session
* bean instance to be notified by its container of transaction
* boundaries.
*
* <p> Only a stateful session bean with container-managed transaction
* demarcation can receive session synchronization notifications. Other bean
* types must not implement the SessionSynchronization interface or use
* the session synchronization annotations.
*
* <p> A stateful session bean class is not required to implement this interface.
*
* @since EJB 1.0
*/
public interface SessionSynchronization {
/**
* The <code>afterBegin</code> method notifies a stateful 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.
*
* <p> The instance can use this method, for example, to read data
* from a database and cache the data in the instance fields.
*
* <p> This method executes in the proper transaction context.
*
* @exception EJBException Thrown by the method to indicate a failure
* caused by a system-level error.
*
* @exception RemoteException This exception is defined in the method
* signature to provide backward compatibility for enterprise beans
* written for the EJB 1.0 specification. Enterprise beans written
* for the EJB 1.1 and later specifications should throw the
* javax.ejb.EJBException instead of this exception.
* Enterprise beans written for the EJB 2.0 and later specifications
* must not throw the java.rmi.RemoteException.
*
* @see AfterBegin
*/
public void afterBegin() throws EJBException, RemoteException;
/**
* The <code>beforeCompletion</code> method notifies a stateful 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.
*
* <p> This method executes in the proper transaction context.
*
* <p><b>Note:</b> The instance may still cause the container to
* rollback the transaction by invoking the <code>setRollbackOnly</code> method
* on the session context, or by throwing an exception.
*
* @exception EJBException Thrown by the method to indicate a failure
* caused by a system-level error.
*
* @exception RemoteException This exception is defined in the method
* signature to provide backward compatibility for enterprise beans
* written for the EJB 1.0 specification. Enterprise beans written
* for the EJB 1.1 and later specification should throw the
* javax.ejb.EJBException instead of this exception.
* Enterprise beans written for the EJB 2.0 and later specifications
* must not throw the java.rmi.RemoteException.
*
* @see BeforeCompletion
*/
public void beforeCompletion() throws EJBException, RemoteException;
/**
* The <code>afterCompletion</code> method notifies a stateful session bean instance that a
* transaction commit protocol has completed, and tells the instance
* whether the transaction has been committed or rolled back.
*
* <p> This method executes with no transaction context.
*
* @param committed True if the transaction has been committed, false
* if is has been rolled back.
*
* @exception EJBException Thrown by the method to indicate a failure
* caused by a system-level error.
*
* @exception RemoteException This exception is defined in the method
* signature to provide backward compatibility for enterprise beans
* written for the EJB 1.0 specification. Enterprise beans written
* for the EJB 1.1 and later specification should throw the
* javax.ejb.EJBException instead of this exception.
* Enterprise beans written for the EJB 2.0 and later specifications
* must not throw the java.rmi.RemoteException.
*
* @see AfterCompletion
*/
public void afterCompletion(boolean committed) throws EJBException,
RemoteException;
}