com.atomikos.persistence.imp.VolatileStateRecoveryManager Maven / Gradle / Ivy
/**
* Copyright (C) 2000-2010 Atomikos
*
* This code ("Atomikos TransactionsEssentials"), by itself,
* is being distributed under the
* Apache License, Version 2.0 ("License"), a copy of which may be found at
* http://www.atomikos.com/licenses/apache-license-2.0.txt .
* You may not use this file except in compliance with the License.
*
* While the License grants certain patent license rights,
* those patent license rights only extend to the use of
* Atomikos TransactionsEssentials by itself.
*
* This code (Atomikos TransactionsEssentials) contains certain interfaces
* in package (namespace) com.atomikos.icatch
* (including com.atomikos.icatch.Participant) which, if implemented, may
* infringe one or more patents held by Atomikos.
* It should be appreciated that you may NOT implement such interfaces;
* licensing to implement these interfaces must be obtained separately from Atomikos.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*/
package com.atomikos.persistence.imp;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.Vector;
import com.atomikos.finitestates.FSMEnterEvent;
import com.atomikos.finitestates.FSMPreEnterListener;
import com.atomikos.icatch.TxState;
import com.atomikos.persistence.LogException;
import com.atomikos.persistence.ObjectImage;
import com.atomikos.persistence.StateRecoverable;
import com.atomikos.persistence.StateRecoveryManager;
import com.atomikos.util.Assert;
/**
* A volatile recovery manager (one that doesn't support persistent logging and
* hence doesn't allow recovery after a crash or restart).
*
*/
public class VolatileStateRecoveryManager implements StateRecoveryManager,
FSMPreEnterListener
{
private Map idToElementMap;
public VolatileStateRecoveryManager ()
{
idToElementMap = new HashMap ();
}
/**
* @see StateRecoveryManager
*/
public void register ( StateRecoverable staterecoverable )
{
Assert.notNull("illegal attempt to register null staterecoverable", staterecoverable);
TxState[] states = staterecoverable.getRecoverableStates ();
if ( states != null ) {
for ( int i = 0; i < states.length; i++ ) {
staterecoverable.addFSMPreEnterListener ( this, states[i] );
}
states = staterecoverable.getFinalStates ();
for ( int i = 0; i < states.length; i++ ) {
staterecoverable.addFSMPreEnterListener ( this, states[i] );
}
}
}
/**
* @see FSMPreEnterListener
*/
public synchronized void preEnter ( FSMEnterEvent event )
throws IllegalStateException
{
TxState state = event.getState ();
StateRecoverable source = (StateRecoverable) event.getSource ();
ObjectImage img = source.getObjectImage ( state );
//if img null: do nothing (BUG FIX 10041)
if ( img != null ) {
StateObjectImage simg = new StateObjectImage ( img );
TxState[] finalstates = source.getFinalStates ();
boolean delete = false;
for ( int i = 0; i < finalstates.length; i++ ) {
if ( state.equals ( finalstates[i] ) )
delete = true;
}
if ( !delete )
idToElementMap.put ( simg.getId (), simg );
else
idToElementMap.remove ( simg.getId () );
}
}
/**
* @see StateRecoveryManager
*/
public void close () throws LogException
{
}
/**
* @see StateRecoveryManager
*/
public StateRecoverable recover ( Object id ) throws LogException
{
StateRecoverable ret = null;
StateObjectImage simg = (StateObjectImage) idToElementMap.get ( id );
if (simg != null) ret = (StateRecoverable) simg.restore ();
return ret;
}
/**
* @see StateRecoveryManager
*/
public Vector> recover () throws LogException
{
Vector> ret = new Vector> ();
Iterator