/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed 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.cluster.session;
import java.util.Map;
import org.apache.catalina.cluster.ClusterManager;
import org.apache.catalina.cluster.ClusterMessage;
/**
* Receive replicated SessionMessage form other cluster node.
*
* @author Peter Rossbach
* @version $Revision: 380229 $ $Date: 2006-02-23 16:28:29 -0500 (Thu, 23 Feb 2006) $
*/
public class ClusterSessionListener extends ClusterListener {
/**
* 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);
}
}
}
/**
* 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);
}
}