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package com.sun.ejb.spi.container;
import javax.ejb.DuplicateKeyException;
/**
* There are cases where the container would need to interact with the
* persistence manager. Some known cases are listed below
* 1. provide the user with a mechanism to flush changes to the database
* at the end of a method with out waiting until the end of the transaction.
* 2. for read only beans provide a mechanism to have the master copy of the bean
* sync up with the database record.
*
* Currently the bean concrete implementation that is created as part of the codegen
* would implement this interface.
*
* @author Pramod Gopinath
*/
public interface BeanStateSynchronization {
/**
* Provides a mechanism to flush changes to the database w/o waiting for
* the end of the transaction, based on some descriptor values set by the user.
* The container would call this method in the postInvoke(), only if the flush
* is enabled for the current method and there were no other exceptions set
* into inv.exception.
*/
public void ejb__flush()
throws DuplicateKeyException;
/**
* On receiving this message the PM would update its master copy
* by fetching the latest information for the primary key from the database
*/
public void ejb__refresh(Object primaryKey);
/**
* On receiving this message the PM would delete from its master copy
* the details related to the primaryKey
*/
public void ejb__remove(Object primaryKey);
}