/*
    * Copyright (C) 2011 The Guava Authors
    *
    * 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 com.google.common.util.concurrent;
  
  import com.google.common.annotations.Beta;
  
  import java.util.concurrent.AbstractExecutorService;
  import java.util.concurrent.Callable;
  
  import javax.annotation.Nullable;
  
  /**
   * Abstract {@link ListeningExecutorService} implementation that creates
   * {@link ListenableFutureTask} instances for each {@link Runnable} and {@link Callable} submitted
   * to it. These tasks are run with the abstract {@link #execute execute(Runnable)} method.
   *
   * <p>In addition to {@link #execute}, subclasses must implement all methods related to shutdown and
   * termination.
   *
   * @author Chris Povirk
   * @since 14.0
   */
  @Beta
  public abstract class AbstractListeningExecutorService
      extends AbstractExecutorService implements ListeningExecutorService {
  
    @Override protected final <T> ListenableFutureTask<T> newTaskFor(Runnable runnable, T value) {
      return ListenableFutureTask.create(runnable, value);
    }
  
    @Override protected final <T> ListenableFutureTask<T> newTaskFor(Callable<T> callable) {
      return ListenableFutureTask.create(callable);
    }
  
    @Override public ListenableFuture<?> submit(Runnable task) {
      return (ListenableFuture<?>) super.submit(task);
    }
  
    @Override public <T> ListenableFuture<T> submit(Runnable task, @Nullable T result) {
      return (ListenableFuture<T>) super.submit(task, result);
    }
  
    @Override public <T> ListenableFuture<T> submit(Callable<T> task) {
      return (ListenableFuture<T>) super.submit(task);
    }
  }