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/*
 * Original Guava code is copyright (C) 2015 The Guava Authors.
 * Modifications from Guava are copyright (C) 2016 DiffPlug.
 *
 * 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.diffplug.common.util.concurrent;

import java.util.Collection;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import com.diffplug.common.collect.ForwardingObject;

/**
 * An executor service which forwards all its method calls to another 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 Kurt Alfred Kluever
 * @since 10.0
 */
public abstract class ForwardingExecutorService extends ForwardingObject
		implements ExecutorService {
	/** Constructor for use by subclasses. */
	protected ForwardingExecutorService() {}

	@Override
	protected abstract ExecutorService delegate();

	@Override
	public boolean awaitTermination(long timeout, TimeUnit unit)
			throws InterruptedException {
		return delegate().awaitTermination(timeout, unit);
	}

	@Override
	public  List> invokeAll(
			Collection> tasks) throws InterruptedException {
		return delegate().invokeAll(tasks);
	}

	@Override
	public  List> invokeAll(
			Collection> tasks, long timeout, TimeUnit unit)
					throws InterruptedException {
		return delegate().invokeAll(tasks, timeout, unit);
	}

	@Override
	public  T invokeAny(Collection> tasks)
			throws InterruptedException, ExecutionException {
		return delegate().invokeAny(tasks);
	}

	@Override
	public  T invokeAny(
			Collection> tasks, long timeout, TimeUnit unit)
					throws InterruptedException, ExecutionException, TimeoutException {
		return delegate().invokeAny(tasks, timeout, unit);
	}

	@Override
	public boolean isShutdown() {
		return delegate().isShutdown();
	}

	@Override
	public boolean isTerminated() {
		return delegate().isTerminated();
	}

	@Override
	public void shutdown() {
		delegate().shutdown();
	}

	@Override
	public List shutdownNow() {
		return delegate().shutdownNow();
	}

	@Override
	public void execute(Runnable command) {
		delegate().execute(command);
	}

	public  Future submit(Callable task) {
		return delegate().submit(task);
	}

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

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