/*
* 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.config.xml.endpoints;
import org.apache.synapse.endpoints.Endpoint;
import org.apache.synapse.endpoints.LoadbalanceEndpoint;
import org.apache.synapse.endpoints.algorithms.LoadbalanceAlgorithm;
import org.apache.synapse.SynapseException;
import org.apache.synapse.SynapseConstants;
import org.apache.synapse.config.xml.endpoints.utils.LoadbalanceAlgorithmFactory;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMNode;
import org.apache.axiom.om.OMAttribute;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import javax.xml.namespace.QName;
import java.util.Iterator;
import java.util.ArrayList;
/**
* Creates LoadbalanceEndpoint using an XML configuration.
*
* <endpoint [name="name"]>
* <loadbalance policy="load balance algorithm">
* <endpoint>+
* </loadbalance>
* </endpoint>
*/
public class LoadbalanceEndpointFactory implements EndpointFactory {
private static Log log = LogFactory.getLog(LoadbalanceEndpointFactory.class);
private static LoadbalanceEndpointFactory instance = new LoadbalanceEndpointFactory();
private LoadbalanceEndpointFactory() {}
public static LoadbalanceEndpointFactory getInstance() {
return instance;
}
public Endpoint createEndpoint(OMElement epConfig, boolean anonymousEndpoint) {
// create the endpoint, manager and the algorithms
OMElement loadbalanceElement = null;
loadbalanceElement = epConfig.getFirstChildWithName
(new QName(SynapseConstants.SYNAPSE_NAMESPACE, "loadbalance"));
if(loadbalanceElement != null) {
LoadbalanceEndpoint loadbalanceEndpoint = new LoadbalanceEndpoint();
// set endpoint name
OMAttribute name = epConfig.getAttribute(new QName(
org.apache.synapse.config.xml.XMLConfigConstants.NULL_NAMESPACE, "name"));
if (name != null) {
loadbalanceEndpoint.setName(name.getAttributeValue());
}
// set endpoints
ArrayList endpoints = getEndpoints(loadbalanceElement, loadbalanceEndpoint);
loadbalanceEndpoint.setEndpoints(endpoints);
// set load balance algorithm
LoadbalanceAlgorithm algorithm = LoadbalanceAlgorithmFactory.
createLoadbalanceAlgorithm(loadbalanceElement, endpoints);
loadbalanceEndpoint.setAlgorithm(algorithm);
// set if failover is turned off
String failover = loadbalanceElement.getAttributeValue(new QName("failover"));
if (failover != null && failover.equalsIgnoreCase("false")) {
loadbalanceEndpoint.setFailover(false);
}
return loadbalanceEndpoint;
}
return null; //To change body of implemented methods use File | Settings | File Templates.
}
public Object getObjectFromOMNode(OMNode om) {
if (om instanceof OMElement) {
return createEndpoint((OMElement) om, false);
} else {
handleException("Invalid XML configuration for an Endpoint. OMElement expected");
}
return null;
}
private ArrayList getEndpoints(OMElement loadbalanceElement, Endpoint parent) {
ArrayList endpoints = new ArrayList();
Iterator iter = loadbalanceElement.getChildrenWithName
(org.apache.synapse.config.xml.XMLConfigConstants.ENDPOINT_ELT);
while (iter.hasNext()) {
OMElement endptElem = (OMElement) iter.next();
EndpointFactory epFac = EndpointAbstractFactory.getEndpointFactroy(endptElem);
Endpoint endpoint = epFac.createEndpoint(endptElem, true);
endpoint.setParentEndpoint(parent);
endpoints.add(endpoint);
}
return endpoints;
}
private static void handleException(String msg) {
log.error(msg);
throw new SynapseException(msg);
}
private static void handleException(String msg, Exception e) {
log.error(msg, e);
throw new SynapseException(msg, e);
}
}