WrappedFuture.java

/*
 * 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 WARRANTIESOR 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.aries.blueprint.utils.threading.impl;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

public class WrappedFuture<T> implements Future<T>
{
  private Discardable<?> _discardable;
  private Future<T> _future;
  
  public WrappedFuture(Future<T> f, Discardable<?> d) {
    _future = f;
    _discardable = d;
  }
  
  public boolean cancel(boolean arg0)
  {
    boolean result = _future.cancel(arg0);
    
    if (result) _discardable.discard();
    
    return result;
  }

  public T get() throws InterruptedException, ExecutionException
  {
    return _future.get();
  }

  public T get(long timeout, TimeUnit timeunit) throws InterruptedException, ExecutionException,
      TimeoutException
  {
    return _future.get(timeout, timeunit);
  }

  public boolean isCancelled()
  {
    return _future.isCancelled();
  }

  public boolean isDone()
  {
    return _future.isDone();
  }
}