/
ClusterService.java
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/
ClusterService.java
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/*
* SymmetricDS is an open source database synchronization solution.
*
* Copyright (C) Chris Henson <chenson42@users.sourceforge.net>
*
* This library 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 3 of the License, or (at your option) any later version.
*
* This library 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 library; if not, see
* <http://www.gnu.org/licenses/>.
*/
package org.jumpmind.symmetric.service.impl;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import org.apache.commons.lang.time.DateUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jumpmind.symmetric.model.Node;
import org.jumpmind.symmetric.service.IClusterService;
import org.jumpmind.symmetric.service.INodeService;
import org.jumpmind.symmetric.service.LockAction;
import org.jumpmind.symmetric.util.AppUtils;
import org.springframework.dao.DataIntegrityViolationException;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
public class ClusterService extends AbstractService implements IClusterService
{
protected static final Log logger = LogFactory.getLog(ClusterService.class);
protected static final String COMMON_LOCK_ID = "common";
private long lockTimeoutInMilliseconds;
private String aquireLockSql;
private String releaseLockSql;
private String insertLockSql;
private boolean lockDuringPurge = false;
private boolean lockDuringPull = false;
private boolean lockDuringPush = false;
private boolean lockDuringHeartbeat = false;
private boolean lockDuringSyncTriggers = false;
private INodeService nodeService;
public void initLockTable()
{
initLockTableForNodes(nodeService.findNodesToPull());
initLockTableForNodes(nodeService.findNodesToPushTo());
initLockTable(LockAction.PURGE, COMMON_LOCK_ID);
initLockTable(LockAction.SYNCTRIGGERS, COMMON_LOCK_ID);
}
private void initLockTableForNodes(final List<Node> nodes)
{
for (final Node node : nodes)
{
initLockTableForNode(node);
}
}
public void initLockTableForNode(final Node node)
{
initLockTable(LockAction.PULL, node.getNodeId());
initLockTable(LockAction.PUSH, node.getNodeId());
initLockTable(LockAction.HEARTBEAT, node.getNodeId());
}
public void initLockTable(final LockAction action, final String lockId)
{
try
{
jdbcTemplate.update(insertLockSql, new Object[] {lockId, action.name()});
logger.debug("Inserted into the node_lock table for " + lockId + ".");
}
catch (final DataIntegrityViolationException ex)
{
logger.debug("Failed to insert to the node_lock table for " + lockId + ". Must be intialized already.");
}
}
@Transactional(propagation = Propagation.REQUIRES_NEW)
public boolean lock(final LockAction action, final Node node)
{
return lock(action, node.getNodeId());
}
@Transactional(propagation = Propagation.REQUIRES_NEW)
public boolean lock(final LockAction action)
{
return lock(action, COMMON_LOCK_ID);
}
@Transactional(propagation = Propagation.REQUIRES_NEW)
public void unlock(final LockAction action)
{
unlock(action, COMMON_LOCK_ID);
}
@Transactional(propagation = Propagation.REQUIRES_NEW)
public void unlock(final LockAction action, final Node node)
{
unlock(action, node.getNodeId());
}
private boolean lock(final LockAction action, final String id)
{
if (isClusteringEnabled(action))
{
final Date timeout = DateUtils.add(new Date(), Calendar.MILLISECOND, (int) lockTimeoutInMilliseconds);
return jdbcTemplate.update(aquireLockSql, new Object[] {getLockingServerId(), id, action.name(), timeout}) == 1;
}
else
{
return true;
}
}
private String getLockingServerId()
{
return AppUtils.getServerId();
}
private void unlock(final LockAction action, final String id)
{
if (isClusteringEnabled(action))
{
jdbcTemplate.update(releaseLockSql, new Object[] {id, action.name(), getLockingServerId()});
}
}
private boolean isClusteringEnabled(final LockAction action)
{
switch (action)
{
case PULL:
return lockDuringPull;
case PUSH:
return lockDuringPush;
case PURGE:
return lockDuringPurge;
case HEARTBEAT:
return lockDuringHeartbeat;
case SYNCTRIGGERS:
return lockDuringSyncTriggers;
case OTHER:
return true;
default:
return false;
}
}
public void setLockTimeoutInMilliseconds(final long lockTimeoutInMilliseconds)
{
this.lockTimeoutInMilliseconds = lockTimeoutInMilliseconds;
}
public void setAquireLockSql(final String aquireLockSql)
{
this.aquireLockSql = aquireLockSql;
}
public void setReleaseLockSql(final String releaseLockSql)
{
this.releaseLockSql = releaseLockSql;
}
public void setInsertLockSql(final String insertLockSql)
{
this.insertLockSql = insertLockSql;
}
public void setNodeService(final INodeService nodeService)
{
this.nodeService = nodeService;
}
public void setLockDuringPurge(final boolean lockDuringPurge)
{
this.lockDuringPurge = lockDuringPurge;
}
public void setLockDuringPull(final boolean lockDuringPull)
{
this.lockDuringPull = lockDuringPull;
}
public void setLockDuringPush(final boolean lockDuringPush)
{
this.lockDuringPush = lockDuringPush;
}
public void setLockDuringHeartbeat(final boolean lockDuringHeartbeat)
{
this.lockDuringHeartbeat = lockDuringHeartbeat;
}
public void setLockDuringSyncTriggers(final boolean lockDuringSyncTriggers)
{
this.lockDuringSyncTriggers = lockDuringSyncTriggers;
}
}