org.apache.catalina.startup.ClusterRuleSetFactory Maven / Gradle / Ivy
/*
* 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.startup;
import org.apache.tomcat.util.digester.Digester;
import org.apache.tomcat.util.digester.RuleSetBase;
import java.lang.reflect.Constructor;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import java.lang.reflect.InvocationTargetException;
public class ClusterRuleSetFactory {
public static final Log log = LogFactory.getLog(ClusterRuleSetFactory.class);
public static RuleSetBase getClusterRuleSet(String prefix) {
//OLD CLUSTER 1
//first try the same classloader as this class server/lib
try {
return loadRuleSet(prefix,"org.apache.catalina.cluster.ClusterRuleSet",ClusterRuleSetFactory.class.getClassLoader());
} catch ( Exception x ) {
//display warning
if ( log.isDebugEnabled() ) log.debug("Unable to load ClusterRuleSet (org.apache.catalina.cluster.ClusterRuleSet), falling back on context classloader");
}
//try to load it from the context class loader
try {
return loadRuleSet(prefix,"org.apache.catalina.cluster.ClusterRuleSet",Thread.currentThread().getContextClassLoader());
} catch ( Exception x ) {
//display warning
if ( log.isDebugEnabled() ) log.debug("Unable to load ClusterRuleSet (org.apache.catalina.cluster.ClusterRuleSet), will try to load the HA cluster");
}
//NEW CLUSTER 2
//first try the same classloader as this class server/lib
try {
return loadRuleSet(prefix,"org.apache.catalina.ha.ClusterRuleSet",ClusterRuleSetFactory.class.getClassLoader());
} catch ( Exception x ) {
//display warning
if ( log.isDebugEnabled() ) log.debug("Unable to load HA ClusterRuleSet (org.apache.catalina.ha.ClusterRuleSet), falling back on context classloader");
}
//try to load it from the context class loader
try {
return loadRuleSet(prefix,"org.apache.catalina.ha.ClusterRuleSet",Thread.currentThread().getContextClassLoader());
} catch ( Exception x ) {
//display warning
if ( log.isDebugEnabled() ) log.debug("Unable to load HA ClusterRuleSet (org.apache.catalina.ha.ClusterRuleSet), falling back on DefaultClusterRuleSet");
}
log.info("Unable to find a cluster rule set in the classpath. Will load the default rule set.");
return new DefaultClusterRuleSet(prefix);
}
protected static RuleSetBase loadRuleSet(String prefix, String className, ClassLoader cl)
throws ClassNotFoundException, InstantiationException,
NoSuchMethodException,IllegalAccessException,
InvocationTargetException {
Class clazz = Class.forName(className,true,cl);
Constructor cons = clazz.getConstructor(new Class[] {String.class});
return (RuleSetBase)cons.newInstance(prefix);
}
/**
* RuleSet for processing the contents of a
* Cluster definition element.
*
* @author Filip Hanik
* @author Peter Rossbach
* @version $Id: ClusterRuleSetFactory.java 939305 2010-04-29 13:43:39Z kkolinko $
*/
public static class DefaultClusterRuleSet extends RuleSetBase {
// ----------------------------------------------------- Instance Variables
/**
* The matching pattern prefix to use for recognizing our elements.
*/
protected String prefix = null;
// ------------------------------------------------------------ Constructor
/**
* Construct an instance of this RuleSet with the default
* matching pattern prefix.
*/
public DefaultClusterRuleSet() {
this("");
}
/**
* Construct an instance of this RuleSet with the specified
* matching pattern prefix.
*
* @param prefix Prefix for matching pattern rules (including the
* trailing slash character)
*/
public DefaultClusterRuleSet(String prefix) {
super();
this.namespaceURI = null;
this.prefix = prefix;
}
// --------------------------------------------------------- Public Methods
/**
* Add the set of Rule instances defined in this RuleSet to the
* specified Digester instance, associating them with
* our namespace URI (if any). This method should only be called
* by a Digester instance.
*
* @param digester Digester instance to which the new Rule instances
* should be added.
*/
@Override
public void addRuleInstances(Digester digester) {
//Cluster configuration start
digester.addObjectCreate(prefix + "Membership",
null, // MUST be specified in the element
"className");
digester.addSetProperties(prefix + "Membership");
digester.addSetNext(prefix + "Membership",
"setMembershipService",
"org.apache.catalina.cluster.MembershipService");
digester.addObjectCreate(prefix + "Sender",
null, // MUST be specified in the element
"className");
digester.addSetProperties(prefix + "Sender");
digester.addSetNext(prefix + "Sender",
"setClusterSender",
"org.apache.catalina.cluster.ClusterSender");
digester.addObjectCreate(prefix + "Receiver",
null, // MUST be specified in the element
"className");
digester.addSetProperties(prefix + "Receiver");
digester.addSetNext(prefix + "Receiver",
"setClusterReceiver",
"org.apache.catalina.cluster.ClusterReceiver");
digester.addObjectCreate(prefix + "Valve",
null, // MUST be specified in the element
"className");
digester.addSetProperties(prefix + "Valve");
digester.addSetNext(prefix + "Valve",
"addValve",
"org.apache.catalina.Valve");
digester.addObjectCreate(prefix + "Deployer",
null, // MUST be specified in the element
"className");
digester.addSetProperties(prefix + "Deployer");
digester.addSetNext(prefix + "Deployer",
"setClusterDeployer",
"org.apache.catalina.cluster.ClusterDeployer");
digester.addObjectCreate(prefix + "Listener",
null, // MUST be specified in the element
"className");
digester.addSetProperties(prefix + "Listener");
digester.addSetNext(prefix + "Listener",
"addLifecycleListener",
"org.apache.catalina.LifecycleListener");
digester.addObjectCreate(prefix + "ClusterListener",
null, // MUST be specified in the element
"className");
digester.addSetProperties(prefix + "ClusterListener");
digester.addSetNext(prefix + "ClusterListener",
"addClusterListener",
"org.apache.catalina.cluster.MessageListener");
//Cluster configuration end
}
}
}