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/*
* Copyright 2014 Open Networking Laboratory
*
* 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 org.onlab.osgi;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceReference;
/**
* Default implementation of the service directory using OSGi framework utilities.
*/
public class DefaultServiceDirectory implements ServiceDirectory {
/**
* Returns the reference to the implementation of the specified service.
*
* @param serviceClass service class
* @param <T> type of service
* @return service implementation
*/
public static <T> T getService(Class<T> serviceClass) {
BundleContext bc = FrameworkUtil.getBundle(serviceClass).getBundleContext();
if (bc != null) {
ServiceReference<T> reference = bc.getServiceReference(serviceClass);
if (reference != null) {
T impl = bc.getService(reference);
if (impl != null) {
return impl;
}
}
}
throw new ServiceNotFoundException("Service " + serviceClass.getName() + " not found");
}
@Override
public <T> T get(Class<T> serviceClass) {
return getService(serviceClass);
}
}
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