/*
* 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.util.Map;
import org.apache.catalina.ha.ClusterListener;
import org.apache.catalina.ha.ClusterManager;
import org.apache.catalina.ha.ClusterMessage;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* Receive replicated SessionMessage form other cluster node.
* @author Filip Hanik
* @author Peter Rossbach
* @version $Id: ClusterSessionListener.java 1195848 2011-11-01 07:00:21Z kfujino $
*/
public class ClusterSessionListener extends ClusterListener {
private static final Log log =
LogFactory.getLog(ClusterSessionListener.class);
/**
* The descriptive information about this implementation.
*/
protected static final String info = "org.apache.catalina.session.ClusterSessionListener/1.1";
//--Constructor---------------------------------------------
public ClusterSessionListener() {
}
//--Logic---------------------------------------------------
/**
* Return descriptive information about this implementation.
*/
public String getInfo() {
return (info);
}
/**
* Callback from the cluster, when a message is received, The cluster will
* broadcast it invoking the messageReceived on the receiver.
*
* @param myobj
* ClusterMessage - the message received from the cluster
*/
public void messageReceived(ClusterMessage myobj) {
if (myobj != null && myobj instanceof SessionMessage) {
SessionMessage msg = (SessionMessage) myobj;
String ctxname = msg.getContextName();
//check if the message is a EVT_GET_ALL_SESSIONS,
//if so, wait until we are fully started up
Map managers = cluster.getManagers() ;
if (ctxname == null) {
java.util.Iterator i = managers.keySet().iterator();
while (i.hasNext()) {
String key = (String) i.next();
ClusterManager mgr = (ClusterManager) managers.get(key);
if (mgr != null)
mgr.messageDataReceived(msg);
else {
//this happens a lot before the system has started
// up
if (log.isDebugEnabled())
log.debug("Context manager doesn't exist:"
+ key);
}
}
} else {
ClusterManager mgr = (ClusterManager) managers.get(ctxname);
if (mgr != null) {
mgr.messageDataReceived(msg);
} else {
if (log.isWarnEnabled())
log.warn("Context manager doesn't exist:" + ctxname);
// A no context manager message is replied in order to avoid
// timeout of GET_ALL_SESSIONS sync phase.
if (msg.getEventType() == SessionMessage.EVT_GET_ALL_SESSIONS) {
SessionMessage replymsg = new SessionMessageImpl(ctxname,
SessionMessage.EVT_ALL_SESSION_NOCONTEXTMANAGER,
null, "NO-CONTEXT-MANAGER","NO-CONTEXT-MANAGER-" + ctxname);
cluster.send(replymsg, msg.getAddress());
}
}
}
}
return;
}
/**
* Accept only SessionMessage
*
* @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 SessionMessage);
}
}