/*
* Copyright 2015 The Apache Software Foundation.
*
* 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.apache.brooklyn.util.core.osgi;
import org.apache.brooklyn.api.mgmt.ManagementContext;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.util.tracker.ServiceTracker;
/**
* Compatibility methods between karaf launcher and monolithic launcher.
*
* @todo Remove after transition to karaf launcher.
*/
public class Compat {
/* synchronized by class initialization */
private static class SingletonHolder {
private static final Compat instance = new Compat();
}
public static Compat getInstance() {
return SingletonHolder.instance;
}
private final ServiceTracker managementContextTracker;
private Compat() {
Bundle bundle = FrameworkUtil.getBundle(Compat.class);
if (bundle != null) {
BundleContext bundleContext = bundle.getBundleContext();
managementContextTracker = new ServiceTracker(bundleContext, ManagementContext.class, null);
managementContextTracker.open();
} else {
managementContextTracker = null;
}
}
/**
* Provides the management context service.
*
* Either from the encompassing OSGi framework or from the servlet context, depending on which launcher was used.
*
* @todo This does not allow ungetting the service after usage, so the bundle will remain blocked until all dependent bundles are
* stopped.
* @fixme Drop this for good after switching to karaf launcher.
*/
public ManagementContext getManagementContext() {
if (managementContextTracker != null) {
return (ManagementContext) managementContextTracker.getService();
}
return null;
}
}