Android Open Source - msf-spaces-sdk-android Request Future

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License

The source code is released under:

Apache License

Java Source Code

package de.imc.mirror.sdk.android;
//  www  . j a  v a2s.  com
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * Helper class to provide blocking IQ requests. 
 * A latch is set up which is released when a result is available.
 * @author simon.schwantzer(at)im-c.de
 *
 */
public class RequestFuture<E> implements Future<E> {
  private volatile E response = null;
    private volatile boolean cancelled = false;
    private final CountDownLatch countDownLatch;
    
  public RequestFuture() {
    countDownLatch = new CountDownLatch(1);
  }

  @Override
  public boolean cancel(boolean mayInterruptIfRunning) {
    if (isDone()) {
      return false;
    } else {
      countDownLatch.countDown();
      cancelled = true;
      return !isDone();
    }
  }

  @Override
  public boolean isCancelled() {
    return cancelled;
  }

  @Override
  public boolean isDone() {
    return countDownLatch.getCount() == 0;
  }

  @Override
  public E get() throws InterruptedException, ExecutionException {
    countDownLatch.await();
    return response;
  }

  @Override
  public E get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
    if (!countDownLatch.await(timeout, unit)) {
      // timed out
      throw new TimeoutException();
    }
    
    return response;
  }
  
  /**
   * Sets the response for the request.
   * When called, the countdown latch is released and the get()-calls are no longer blocked.
   * This method is called when the related IQ response is received by the SpacesService.
   * @param response IQ response send by the server.
   */
  public void setResponse(E response) {
    this.response = response;
    countDownLatch.countDown();
  }
  
}

Java Source Code List

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