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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.ha.session;
import java.io.IOException;
import org.apache.catalina.Container;
import org.apache.catalina.Context;
import org.apache.catalina.Engine;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.Session;
import org.apache.catalina.ha.ClusterListener;
import org.apache.catalina.ha.ClusterMessage;
import org.apache.catalina.core.StandardEngine;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.res.StringManager;
/**
* Receive SessionID cluster change from other backup node after primary session
* node is failed.
*
* @author Peter Rossbach
*
*/
public class JvmRouteSessionIDBinderListener extends ClusterListener {
private static final Log log =
LogFactory.getLog(JvmRouteSessionIDBinderListener.class);
private static final StringManager sm =
StringManager.getManager(Constants.Package);
/**
* The descriptive information about this implementation.
*/
protected static final String info = "org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener/1.1";
//--Instance Variables--------------------------------------
protected boolean started = false;
/**
* number of session that goes to this cluster node
*/
private long numberOfSessions = 0;
//--Constructor---------------------------------------------
public JvmRouteSessionIDBinderListener() {
}
//--Logic---------------------------------------------------
/**
* Return descriptive information about this implementation.
*/
public String getInfo() {
return (info);
}
/**
* @return Returns the numberOfSessions.
*/
public long getNumberOfSessions() {
return numberOfSessions;
}
/**
* Add this Mover as Cluster Listener ( receiver)
*
* @throws LifecycleException
*/
public void start() throws LifecycleException {
if (started)
return;
getCluster().addClusterListener(this);
started = true;
if (log.isInfoEnabled())
log.info(sm.getString("jvmRoute.clusterListener.started"));
}
/**
* Remove this from Cluster Listener
*
* @throws LifecycleException
*/
public void stop() throws LifecycleException {
started = false;
getCluster().removeClusterListener(this);
if (log.isInfoEnabled())
log.info(sm.getString("jvmRoute.clusterListener.stopped"));
}
/**
* Callback from the cluster, when a message is received, The cluster will
* broadcast it invoking the messageReceived on the receiver.
*
* @param msg
* ClusterMessage - the message received from the cluster
*/
public void messageReceived(ClusterMessage msg) {
if (msg instanceof SessionIDMessage && msg != null) {
SessionIDMessage sessionmsg = (SessionIDMessage) msg;
if (log.isDebugEnabled())
log.debug(sm.getString(
"jvmRoute.receiveMessage.sessionIDChanged", sessionmsg
.getOrignalSessionID(), sessionmsg
.getBackupSessionID(), sessionmsg
.getContextPath()));
Container container = getCluster().getContainer();
Container host = null ;
if(container instanceof Engine) {
host = container.findChild(sessionmsg.getHost());
} else {
host = container ;
}
if (host != null) {
Context context = (Context) host.findChild(sessionmsg
.getContextPath());
if (context != null) {
try {
Session session = context.getManager().findSession(
sessionmsg.getOrignalSessionID());
if (session != null) {
session.setId(sessionmsg.getBackupSessionID());
} else if (log.isInfoEnabled())
log.info(sm.getString("jvmRoute.lostSession",
sessionmsg.getOrignalSessionID(),
sessionmsg.getContextPath()));
} catch (IOException e) {
log.error(e);
}
} else if (log.isErrorEnabled())
log.error(sm.getString("jvmRoute.contextNotFound",
sessionmsg.getContextPath(), ((StandardEngine) host
.getParent()).getJvmRoute()));
} else if (log.isErrorEnabled())
log.error(sm.getString("jvmRoute.hostNotFound", sessionmsg.getContextPath()));
}
return;
}
/**
* Accept only SessionIDMessages
*
* @param msg
* ClusterMessage
* @return boolean - returns true to indicate that messageReceived should be
* invoked. If false is returned, the messageReceived method will
* not be invoked.
*/
public boolean accept(ClusterMessage msg) {
return (msg instanceof SessionIDMessage);
}
}
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