| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.ipojo.extender.internal.queue; |
| |
| import org.apache.felix.ipojo.extender.internal.AbstractService; |
| import org.apache.felix.ipojo.extender.internal.LifecycleQueueService; |
| import org.apache.felix.ipojo.extender.queue.Callback; |
| import org.apache.felix.ipojo.extender.queue.Job; |
| import org.apache.felix.ipojo.extender.queue.JobInfo; |
| import org.apache.felix.ipojo.extender.queue.QueueService; |
| import org.osgi.framework.BundleContext; |
| |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.Dictionary; |
| import java.util.Hashtable; |
| import java.util.List; |
| import java.util.concurrent.*; |
| |
| /** |
| * An implementation of the Lifecycle Queue Service for synchronous processing. |
| */ |
| public class SynchronousQueueService extends AbstractQueueService implements LifecycleQueueService { |
| |
| private final Statistic m_statistic = new Statistic(); |
| |
| public SynchronousQueueService(BundleContext bundleContext) { |
| super(bundleContext, QueueService.class); |
| } |
| |
| @Override |
| protected Dictionary<String, ?> getServiceProperties() { |
| Hashtable<String, Object> properties = new Hashtable<String, Object>(); |
| properties.put(QueueService.QUEUE_MODE_PROPERTY, QueueService.SYNCHRONOUS_QUEUE_MODE); |
| return properties; |
| } |
| |
| public int getFinished() { |
| return m_statistic.getFinishedCounter().get(); |
| } |
| |
| public int getWaiters() { |
| return 0; |
| } |
| |
| public int getCurrents() { |
| return m_statistic.getCurrentsCounter().get(); |
| } |
| |
| public List<JobInfo> getWaitersInfo() { |
| return Collections.emptyList(); |
| } |
| |
| public <T> Future<T> submit(Job<T> callable, Callback<T> callback, String description) { |
| JobInfoCallable<T> exec = new JobInfoCallable<T>(this, m_statistic, callable, callback, description); |
| try { |
| return new ImmediateFuture<T>(exec.call()); |
| } catch (Exception e) { |
| return new ExceptionFuture<T>(e); |
| } |
| |
| } |
| |
| public <T> Future<T> submit(Job<T> callable, String description) { |
| return submit(callable, null, description); |
| } |
| |
| public <T> Future<T> submit(Job<T> callable) { |
| return submit(callable, "No description"); |
| } |
| |
| private class ImmediateFuture<T> implements Future<T> { |
| private T m_result; |
| |
| public ImmediateFuture(T result) { |
| m_result = result; |
| } |
| |
| public boolean cancel(boolean mayInterruptIfRunning) { |
| return false; |
| } |
| |
| public boolean isCancelled() { |
| return false; |
| } |
| |
| public boolean isDone() { |
| return true; |
| } |
| |
| public T get() throws InterruptedException, ExecutionException { |
| return m_result; |
| } |
| |
| public T get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException { |
| return get(); |
| } |
| } |
| |
| private class ExceptionFuture<T> extends ImmediateFuture<T> { |
| private ExecutionException m_exception; |
| |
| public ExceptionFuture(Exception e) { |
| super(null); |
| m_exception = new ExecutionException(e); |
| } |
| |
| @Override |
| public T get() throws InterruptedException, ExecutionException { |
| throw m_exception; |
| } |
| |
| } |
| } |