/*
* Copyright (c) 2005-2010, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.mashup.jsservices.internal;
import org.osgi.framework.*;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.mashup.utils.HostObjectServiceInterface;
import org.wso2.carbon.utils.Utils;
import java.util.*;
public class HostObjectServiceListener implements ServiceListener {
private static Log log = LogFactory.getLog(HostObjectServiceListener.class);
private Map<String, Bundle> requiredHostObjectsMap = new HashMap<String, Bundle>();
private List<String> hostObjectsThatNeedServices;
private BundleContext bundleContext;
private boolean listenerRegistered;
public HostObjectServiceListener(BundleContext bundleContext, List<String> hostObjectsThatNeedServices) {
this.bundleContext = bundleContext;
this.hostObjectsThatNeedServices = hostObjectsThatNeedServices;
}
/**
* Registering HostObjectServiceListener as a ServiceListener
*
* @return boolean : whether the listener is registered
*/
boolean registerServiceListener() {
if (requiredHostObjectsMap.isEmpty()) {
//There are no required Host Objects
listenerRegistered = false;
} else {
//Registering HostObjectServiceListener as a ServiceListener
bundleContext.addServiceListener(this);
listenerRegistered = true;
}
return listenerRegistered;
}
void unregisterServiceListener() {
if (listenerRegistered) {
bundleContext.removeServiceListener(this);
}
}
synchronized void start() {
try {
//Getting the registered required OSGi services
ServiceReference[] references = bundleContext.getServiceReferences(HostObjectServiceInterface.class.getName(), null);
if (references != null && references.length > 0) {
for (ServiceReference reference : references) {
HostObjectServiceInterface hostObjectServiceInterface = (HostObjectServiceInterface) bundleContext.getService(reference);
String className = hostObjectServiceInterface.getHostObjectClassName();
hostObjectsThatNeedServices.remove(className);
}
}
} catch (InvalidSyntaxException e) {
//SyntaxError Occured. Ignoring
log.error(e.getCause(), e);
}
}
void addRequiredServiceBundle(Bundle bundle, String hostObjectName) {
requiredHostObjectsMap.put(hostObjectName, bundle);
}
public synchronized void serviceChanged(ServiceEvent event) {
if (event.getType() == ServiceEvent.REGISTERED) {
Object service = bundleContext.getService(event.getServiceReference());
if (service instanceof HostObjectServiceInterface) {
HostObjectServiceInterface hostObjectServiceInterface = (HostObjectServiceInterface) service;
hostObjectsThatNeedServices.remove(hostObjectServiceInterface.getHostObjectClassName());
}
if (hostObjectsThatNeedServices.isEmpty()) {
try {
bundleContext.removeServiceListener(this);
Utils.registerDeployerServices(bundleContext);
} catch (Exception e) {
String msg = "Failed to register JSDeployer as an OSGi service.";
log.error(msg, e);
}
}
}
}
public List<String> getHostObjectsThatNeedServices() {
return hostObjectsThatNeedServices;
}
}