| /** |
| * |
| * Copyright 2005-2006 The Apache Software Foundation or its licensors, as applicable. |
| * |
| * 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.xbean.kernel.standard; |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| import edu.emory.mathcs.backport.java.util.concurrent.locks.Lock; |
| import org.apache.xbean.kernel.Kernel; |
| import org.apache.xbean.kernel.ServiceCondition; |
| import org.apache.xbean.kernel.ServiceFactory; |
| import org.apache.xbean.kernel.ServiceName; |
| |
| /** |
| * A special sub-class of AggregateCondition used to manage the stop conditions of a non-restartable service. This class |
| * will update stop conditions to reflect the stop conditions currently registered with the service factory, when the |
| * initialized or getUnsatisfied methods are called. |
| * |
| * @author Dain Sundstrom |
| * @version $Id$ |
| * @since 2.0 |
| */ |
| public class NonRestartableStopCondition extends AggregateCondition { |
| private final ServiceFactory serviceFactory; |
| |
| /** |
| * Creates a NonRestartableStopCondition. |
| * |
| * @param kernel the kernel in which the service is registered |
| * @param serviceName the name of the service |
| * @param classLoader the class loader for the service |
| * @param lock the lock for the service manager |
| * @param serviceFactory the service factory for the service |
| */ |
| public NonRestartableStopCondition(Kernel kernel, ServiceName serviceName, ClassLoader classLoader, Lock lock, ServiceFactory serviceFactory) { |
| super(kernel, serviceName, classLoader, lock, Collections.EMPTY_SET); |
| this.serviceFactory = serviceFactory; |
| } |
| |
| /** |
| * Throws UnsupportedOperationException. Initialize is not a valid operation for a NonRestartableStopCondition |
| * |
| * @throws UnsupportedOperationException always |
| */ |
| public synchronized void initialize() throws UnsupportedOperationException { |
| throw new UnsupportedOperationException("initialize should never be called on a NonRestartableStopCondition"); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public synchronized Set getUnsatisfied() { |
| updateConditions(); |
| return super.getUnsatisfied(); |
| } |
| |
| private void updateConditions() { |
| if (isDestroyed()) throw new IllegalStateException("destroyed"); |
| |
| Set conditions = getConditions(); |
| |
| // add the new conditions |
| Set stopConditions = serviceFactory.getStopConditions(); |
| for (Iterator iterator = stopConditions.iterator(); iterator.hasNext();) { |
| ServiceCondition condition = (ServiceCondition) iterator.next(); |
| if (!conditions.contains(condition)) { |
| addCondition(condition); |
| } |
| } |
| |
| // remove the conditions that were dropped |
| for (Iterator iterator = conditions.iterator(); iterator.hasNext();) { |
| ServiceCondition serviceCondition = (ServiceCondition) iterator.next(); |
| if (!stopConditions.contains(serviceCondition)) { |
| removeCondition(serviceCondition); |
| } |
| } |
| } |
| |
| } |