Android Open Source - android-http Worker Queue

From Project

Back to project page android-http.

License

The source code is released under:

Apache License

If you think the Android project android-http listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

/*
 * Copyright (C) 2012 the diamond:dogs|group
 */*from  w w w . j  av a2s .  c o  m*/
 * 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 at.diamonddogs.util;

import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A simple worker queue
 */
public class WorkerQueue {

  private static final Logger LOGGER = LoggerFactory.getLogger(WorkerQueue.class.getSimpleName());
  private LinkedBlockingQueue<Runnable> outstandingRequests;

  private ThreadPoolExecutor threadPoolExecuter;

  /**
   * Creates a {@link WorkerQueue}
   * 
   * @param corePoolSize
   *            the core pool size
   * @param maxPoolSize
   *            the max pool size
   * @param keepAliveTimeMs
   *            the keep alive time in ms
   */
  public WorkerQueue(int corePoolSize, int maxPoolSize, long keepAliveTimeMs) {
    outstandingRequests = new LinkedBlockingQueue<Runnable>();
    threadPoolExecuter = new ThreadPoolExecutor(corePoolSize, maxPoolSize, keepAliveTimeMs, TimeUnit.MILLISECONDS, outstandingRequests);
  }

  /**
   * 
   * Cancel a running task
   * 
   * @param <T>
   *            the type of object to be returned by the {@link Callable} /
   *            {@link Future}
   * @param task
   *            the task to cancel
   * @return returns the {@link Future} of the task that has been canceled or
   *         <code>null</code> if the executer was shutdown
   * 
   * @return
   */
  public <T> Future<T> runCancelableTask(Callable<T> task) {
    if (!threadPoolExecuter.isShutdown()) {
      return threadPoolExecuter.submit(task);
    }
    return null;
  }

  /**
   * Checks if the executer was shut down
   * 
   * @return <code>true</code> if it was, <code>false</code> otherwise
   */
  public boolean isShutDown() {
    return threadPoolExecuter.isShutdown();
  }

  /**
   * Shuts down the executor
   */
  public void shutDown() {
    LOGGER.debug("shuting down NOW");
    threadPoolExecuter.shutdownNow();
  }
}

Java Source Code List