/*
* 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.synapse.core.axis2;
import org.apache.axis2.clustering.ClusterManager;
import org.apache.axis2.clustering.LoadBalanceEventHandler;
import org.apache.axis2.clustering.Member;
import org.apache.axis2.context.ConfigurationContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.SynapseException;
import org.apache.synapse.core.LoadBalanceMembershipHandler;
import org.apache.synapse.endpoints.algorithms.AlgorithmContext;
import org.apache.synapse.endpoints.algorithms.LoadbalanceAlgorithm;
import java.util.Properties;
/**
* Bridge between Axis2 membership notification and Synapse load balancing
*/
public class Axis2LoadBalanceMembershipHandler implements LoadBalanceMembershipHandler {
private static final Log log = LogFactory.getLog(Axis2LoadBalanceMembershipHandler.class);
private String lbDomain;
private LoadBalanceEventHandler lbEventHandler;
private ConfigurationContext configCtx;
private LoadbalanceAlgorithm algorithm;
private Properties properties;
public void init(Properties props, LoadbalanceAlgorithm algorithm) {
this.properties = props;
this.lbDomain = props.getProperty("applicationDomain");
if(lbDomain == null){
String msg = "The applicationDomain property has not been specified in the " +
"dynamicLoadbalance configuration in the synapse.xml file. This has " +
"to be the same as the applicationDomain entry in the loadBalancer" +
" entry in the axis2.xml file.";
log.error(msg);
throw new SynapseException(msg);
}
this.algorithm = algorithm;
}
public void setConfigurationContext(ConfigurationContext configCtx) {
this.configCtx = configCtx;
// The following code does the bridging between Axis2 and Synapse load balancing
ClusterManager clusterManager = configCtx.getAxisConfiguration().getClusterManager();
if(clusterManager == null){
String msg = "In order to enable load balancing across an Axis2 cluster, " +
"the cluster entry should be enabled in the axis2.xml file";
log.error(msg);
throw new SynapseException(msg);
}
lbEventHandler = clusterManager.getLoadBalanceEventHandler(lbDomain);
if(lbEventHandler == null){
String msg =
"A LoadBalanceEventHandler has not been specified in the axis2.xml " +
"file for the domain " + lbDomain;
log.error(msg);
throw new SynapseException(msg);
}
}
public ConfigurationContext getConfigurationContext(){
return configCtx;
}
/**
* Getting the next member to which the request has to be sent in a round-robin fashion
*
* @param context The AlgorithmContext
* @return The current member
*/
public Member getNextApplicationMember(AlgorithmContext context) {
algorithm.setApplicationMembers(lbEventHandler.getMembers());
return algorithm.getNextApplicationMember(context);
}
public LoadbalanceAlgorithm getLoadbalanceAlgorithm() {
return this.algorithm;
}
public Properties getProperties() {
return this.properties;
}
}