| package org.superbiz.executor; |
| |
| import javax.annotation.Resource; |
| import javax.enterprise.concurrent.ManagedThreadFactory; |
| import javax.enterprise.context.RequestScoped; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.logging.Logger; |
| |
| /** |
| * 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 |
| * <p> |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * <p> |
| * 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. |
| */ |
| @RequestScoped |
| public class ThreadFactoryService { |
| |
| private static final Logger LOGGER = Logger.getLogger(ThreadFactoryService.class.getSimpleName()); |
| |
| @Resource |
| private ManagedThreadFactory factory; |
| |
| /** |
| * Happy path. |
| * |
| * @param longTask to compute |
| */ |
| public void asyncTask(final LongTask longTask) throws InterruptedException { |
| LOGGER.info("Create asyncTask"); |
| |
| final Thread thread = factory.newThread(longTask); |
| thread.setName("pretty asyncTask"); |
| thread.start(); |
| } |
| |
| /** |
| * Example where we have to stop a thread. |
| * |
| * @param longTask |
| * @throws InterruptedException |
| */ |
| public void asyncHangingTask(final Runnable longTask) { |
| LOGGER.info("Create asyncHangingTask"); |
| |
| final Thread thread = factory.newThread(longTask); |
| thread.setName("pretty asyncHangingTask"); |
| thread.start(); |
| |
| if (thread.isAlive()) { |
| // This will cause any wait in the thread to resume. |
| // This will call the InterruptedException block in the longRunnableTask method. |
| thread.interrupt(); |
| } |
| } |
| |
| /** |
| * Runnable rung task simulating a lengthy operation. |
| * In the other test classes we use anonymous classes. |
| * It's useful to have a "real" class in this case to be able to access the result of the operation. |
| */ |
| public static class LongTask implements Runnable { |
| private final int value; |
| private final long taskDurationMs; |
| private final CountDownLatch countDownLatch; |
| private int result; |
| private AtomicBoolean isTerminated = new AtomicBoolean(false); |
| |
| public LongTask(final int value, |
| final long taskDurationMs, |
| final CountDownLatch countDownLatch) { |
| this.value = value; |
| this.taskDurationMs = taskDurationMs; |
| this.countDownLatch = countDownLatch; |
| } |
| |
| public int getResult() { |
| return result; |
| } |
| |
| public boolean getIsTerminated() { |
| return isTerminated.get(); |
| } |
| |
| @Override |
| public void run() { |
| try { |
| // Simulate a long processing task using TimeUnit to sleep. |
| TimeUnit.MILLISECONDS.sleep(taskDurationMs); |
| } catch (InterruptedException e) { |
| isTerminated.set(true); |
| countDownLatch.countDown(); |
| throw new RuntimeException("Problem while waiting"); |
| } |
| |
| result = value + 1; |
| LOGGER.info("longRunnableTask complete. Value is " + result); |
| countDownLatch.countDown(); |
| // Cannot return result with a Runnable. Must store and access it later. |
| } |
| } |
| } |