/*
* Copyright 2014 Red Hat Inc. and/or its affiliates and other contributors.
*
* 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.switchyard.deploy.osgi.base;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* SimpleExtension.
*/
public abstract class SimpleExtension implements Extension {
protected final Bundle _bundle;
protected final BundleContext _bundleContext;
protected final AtomicBoolean _destroyed = new AtomicBoolean(false);
/**
* Create new instance of SimpleExtension.
* @param bundle bundle
*/
public SimpleExtension(Bundle bundle) {
_bundle = bundle;
_bundleContext = bundle.getBundleContext();
}
/**
* Whether the extension has been destroyed.
* @return true if the extension has been destroyed, false otherwise.
*/
public boolean isDestroyed() {
synchronized (getLock()) {
return _destroyed.get();
}
}
/**
* Retrieves the bundle for this extension.
* @return bundle
*/
public Bundle getBundle() {
return _bundle;
}
/**
* Retrieves the bundle context for this extension.
* @return bundle context
*/
public BundleContext getBundleContext() {
return _bundleContext;
}
@Override
public void start() throws Exception {
synchronized (getLock()) {
if (_destroyed.get()) {
return;
}
if (_bundle.getState() != Bundle.ACTIVE) {
return;
}
if (_bundle.getBundleContext() != _bundleContext) {
return;
}
doStart();
}
}
@Override
public void destroy() throws Exception {
synchronized (getLock()) {
_destroyed.set(true);
}
doDestroy();
}
protected Object getLock() {
return this;
}
protected abstract void doStart() throws Exception;
protected abstract void doDestroy() throws Exception;
}