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* JBoss, Home of Professional Open Source
* Copyright 2010, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
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*
* This software is distributed in the hope that it will be useful,
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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*/
package javax.ejb;

import java.rmi.RemoteException;

/**
 * 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.
 */
public interface SessionSynchronization {

  /**
   * 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.
   *
   * @exception EJBException - Thrown by the method to indicate a failure caused by a system-level error.
   * @exception java.rmi.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 higher specifications should throw the javax.ejb.EJBException instead of this exception.
   * Enterprise beans written for the EJB 2.0 and higher specifications must not throw the java.rmi.RemoteException.
   */
  public void afterBegin() 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.
   *
   * @exception EJBException - Thrown by the method to indicate a failure caused by a system-level error.
   * @exception java.rmi.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 higher specifications should throw the javax.ejb.EJBException instead of this exception.
   * Enterprise beans written for the EJB 2.0 and higher specifications must not throw the java.rmi.RemoteException.
   */
  public void beforeCompletion() 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.
    *
    * @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 java.rmi.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 higher specifications should throw the javax.ejb.EJBException instead of this exception.
    * Enterprise beans written for the EJB 2.0 and higher specifications must not throw the java.rmi.RemoteException.
    */
   public void afterCompletion(boolean committed) throws EJBException, RemoteException;
}