/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file 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
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* 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
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.aspects.versioned;
import org.jboss.ha.framework.interfaces.HAPartition;
import org.jboss.ha.framework.interfaces.HAPartition.HAMembershipListener;
import org.jboss.ha.framework.interfaces.HAPartition.HAPartitionStateTransfer;
import org.jboss.logging.Logger;
import org.jboss.util.id.GUID;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;
/**
* Adds replication
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 57186 $
*/
public class DistributedSynchronizationManager extends LocalSynchronizationManager implements HAPartitionStateTransfer, HAMembershipListener
{
protected static Logger log = Logger.getLogger(DistributedSynchronizationManager.class);
protected HAPartition partition;
protected String domainName;
protected Hashtable heldLocks = new Hashtable();
public DistributedSynchronizationManager(String domainName, DistributedVersionManager versionManager, HAPartition partition)
{
super(versionManager);
this.partition = partition;
this.domainName = domainName + "/SynchManager";
}
public void create() throws Exception
{
//partition.subscribeToStateTransferEvents(domainName, this);
partition.registerRPCHandler(domainName, this);
}
public void start() throws Exception
{
pullState();
}
protected void pullState() throws Exception
{
Object[] args = {};
ArrayList rsp = partition.callMethodOnCluster(domainName, "getCurrentState", args, true);
if (rsp.size() > 0)
setCurrentState((Serializable)rsp.get(0));
}
public Serializable getCurrentState()
{
if(log.isTraceEnabled() )
log.trace("getCurrentState called");
return stateTable;
}
public void setCurrentState(Serializable newState)
{
if( log.isTraceEnabled() )
log.trace("setCurrentState called");
try
{
synchronized (tableLock)
{
this.stateTable = (Hashtable)newState;
log.trace("setCurrentState, size: " + stateTable.size());
Iterator it = stateTable.values().iterator();
while (it.hasNext())
{
DistributedState state = (DistributedState)it.next();
if (objectTable.containsKey(state.getGUID())) continue;
state.buildObject(this, versionManager);
}
}
}
catch (Exception ex)
{
log.error("failed to set state sent from cluster", ex);
}
}
public void membershipChanged(Vector deadMembers, Vector newMembers, Vector allMembers)
{
for (int i = 0; i < deadMembers.size(); i++)
{
Hashtable held = (Hashtable)heldLocks.remove(deadMembers.get(i));
if (held != null)
{
Iterator it = held.values().iterator();
while (it.hasNext())
{
List list = (List)it.next();
releaseHeldLocks(list);
}
}
}
}
public void sendNewObjects(List newObjects) throws Exception
{
log.trace("sending new objects");
try
{
Object[] args = {newObjects};
checkResponses(partition.callMethodOnCluster(domainName, "addNewObjects", args, true));
}
catch (Exception ex)
{
log.error("serious cache problems, data inconsistency is imminent", ex);
throw ex;
}
}
protected void sendClusterUpdatesAndRelease(GUID globalTxId, List clusterUpdates) throws Exception
{
try
{
Object[] args = {partition.getNodeName(), globalTxId, clusterUpdates};
checkResponses(partition.callMethodOnCluster(domainName, "updateObjects", args, true));
}
catch (Exception ex)
{
log.error("serious cache problems, data inconsistency is imminent", ex);
throw ex;
}
}
protected void acquireRemoteLocks(GUID globalTxId, List guids) throws Exception
{
try
{
Object[] args = {partition.getNodeName(), globalTxId, guids};
checkResponses(partition.callMethodOnCluster(domainName, "acquireLocks", args, true));
}
catch (Exception ex)
{
try
{
Object[] args = {partition.getNodeName()};
partition.callMethodOnCluster(domainName, "releaseHeldLocks", args, true);
}
catch (Exception ignored)
{
}
throw ex;
}
}
public void noTxUpdate(DistributedUpdate update) throws Exception
{
throw new RuntimeException("NOT IMPLEMENTED");
}
public void addNewObjects(List newObjects) throws Exception
{
// updates must be in table first
synchronized (tableLock)
{
for (int i = 0; i < newObjects.size(); i++)
{
DistributedState state = (DistributedState)newObjects.get(i);
// REVISIT synch
stateTable.put(state.getGUID(), state);
}
for (int i = 0; i < newObjects.size(); i++)
{
DistributedState state = (DistributedState)newObjects.get(i);
if (objectTable.containsKey(state.getGUID())) continue;
state.buildObject(this, versionManager);
}
}
}
public void updateObjects(String nodeName, GUID globalTxId, ArrayList updates) throws Exception
{
log.trace("updateObjects");
synchronized (tableLock)
{
for (int i = 0; i < updates.size(); i++)
{
DistributedUpdate update = (DistributedUpdate)updates.get(i);
// REVISIT: synch
DistributedState state = (DistributedState)stateTable.get(update.getGUID());
state.mergeState(update);
state.releaseWriteLock();
}
}
Hashtable table = (Hashtable)heldLocks.get(nodeName);
table.remove(globalTxId);
log.trace("end updateObjects");
}
public void releaseHeldLocks(String nodeName, GUID globalTxId)
{
Hashtable held = (Hashtable)heldLocks.get(nodeName);
if (held == null) return;
List locks = (List)held.remove(globalTxId);
if (locks != null) releaseHeldLocks(locks);
}
public void acquireLocks(String nodeName, GUID globalTxId, List list) throws Exception
{
log.trace("acquireLocks");
ArrayList locks = new ArrayList();
try
{
for (int i = 0; i < list.size(); i++)
{
GUID guid = (GUID)list.get(i);
DistributedState state = getState(guid);
state.acquireWriteLock();
locks.add(state);
}
Hashtable held = (Hashtable)heldLocks.get(nodeName);
if (held == null)
{
held = new Hashtable();
heldLocks.put(nodeName, held);
}
held.put(globalTxId, locks);
}
catch (Exception ex)
{
releaseHeldLocks(locks);
throw ex;
}
log.trace("end acquireLocks");
}
/**
* Checks whether any of the responses are exceptions. If yes, re-throws
* them (as exceptions or runtime exceptions).
* @param rsps
* @throws Exception
*/
protected void checkResponses(List rsps) throws Exception {
Object rsp;
if(rsps != null) {
for(Iterator it=rsps.iterator(); it.hasNext();) {
rsp=it.next();
if(rsp != null) {
if(rsp instanceof RuntimeException)
throw (RuntimeException)rsp;
if(rsp instanceof Exception)
throw (Exception)rsp;
}
}
}
}
}
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