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/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Copyright @ 2015 Atlassian Pty Ltd
*
* 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 net.java.sip.communicator.util;
import org.osgi.framework.*;
/**
* Base class for activators which only register new service in bundle context.
* Service registration activity is logged on <tt>INFO</tt> level.
*
* @param <T> service implementation template type
* (for convenient instance access)
*
* @author Pawel Domas
*/
public abstract class SimpleServiceActivator<T>
implements BundleActivator
{
/**
* The <tt>Logger</tt> instance used for logging output.
*/
private final Logger logger;
/**
* Class of the service
*/
private final Class<?> serviceClass;
/**
* Service name that will be used in log messages
*/
private final String serviceName;
/**
* Instance of service implementation
*/
protected T serviceImpl;
/**
* Creates new instance of <tt>SimpleServiceActivator</tt>
*
* @param serviceClass class of service that will be registered on bundle
* startup
* @param serviceName service name that wil be used in log messages
*/
public SimpleServiceActivator(Class<?> serviceClass, String serviceName)
{
this.serviceClass = serviceClass;
this.serviceName = serviceName;
logger = Logger.getLogger(this.getClass().getName());
}
/**
* Initialize and start the service.
*
* @param bundleContext the <tt>BundleContext</tt>
* @throws Exception if initializing and starting this service fails
*/
public void start(BundleContext bundleContext)
throws Exception
{
//Create the service impl
serviceImpl = createServiceImpl();
if (logger.isInfoEnabled())
logger.info(serviceName+" STARTED");
bundleContext
.registerService(
serviceClass.getName(),
serviceImpl,
null);
if (logger.isInfoEnabled())
logger.info(serviceName+" REGISTERED");
}
/**
* Stops this bundle.
*
* @param bundleContext the <tt>BundleContext</tt>
* @throws Exception if the stop operation goes wrong
*/
public void stop(BundleContext bundleContext)
throws Exception
{
}
/**
* Called on bundle startup in order to create service implementation
* instance.
*
* @return should return new instance of service implementation.
*/
protected abstract T createServiceImpl();
}
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