| /* |
| * 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.felix.utils.extender; |
| |
| import org.osgi.framework.Bundle; |
| import org.osgi.framework.BundleContext; |
| |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| public abstract class SimpleExtension implements Extension { |
| |
| private final Bundle bundle; |
| private final BundleContext bundleContext; |
| private final AtomicBoolean destroyed = new AtomicBoolean(false); |
| |
| public SimpleExtension(Bundle bundle) { |
| this.bundle = bundle; |
| this.bundleContext = bundle.getBundleContext(); |
| } |
| |
| public boolean isDestroyed() { |
| synchronized (getLock()) { |
| return destroyed.get(); |
| } |
| } |
| |
| public void start() throws Exception { |
| synchronized (getLock()) { |
| if (destroyed.get()) { |
| return; |
| } |
| if (bundle.getState() != Bundle.ACTIVE) { |
| return; |
| } |
| if (bundle.getBundleContext() != bundleContext) { |
| return; |
| } |
| doStart(); |
| } |
| } |
| |
| 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; |
| |
| } |