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/*
 * 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.GwtIncompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.concurrent.Callable;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A listening executor service which forwards all its method calls to another listening executor
 * service. Subclasses should override one or more methods to modify the behavior of the backing
 * executor service as desired per the decorator pattern.
 *
 * @author Isaac Shum
 * @since 10.0
 */
@CanIgnoreReturnValue // TODO(cpovirk): Consider being more strict.
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public abstract class ForwardingListeningExecutorService extends ForwardingExecutorService
    implements ListeningExecutorService {
  /** Constructor for use by subclasses. */
  protected ForwardingListeningExecutorService() {}

  @Override
  protected abstract ListeningExecutorService delegate();

  @Override
  public  ListenableFuture submit(Callable task) {
    return delegate().submit(task);
  }

  @Override
  public ListenableFuture submit(Runnable task) {
    return delegate().submit(task);
  }

  @Override
  public  ListenableFuture submit(
      Runnable task, @ParametricNullness T result) {
    return delegate().submit(task, result);
  }
}