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/*
 * Copyright 2015-2017 GenerallyCloud.com
 *  
 * 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.generallycloud.baseio.concurrent;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ExecutorPoolEventLoop implements ExecutorEventLoop {

	private int				eventLoopSize;
	private int				maxEventLoopSize;
	private long				keepAliveTime;
	private int				maxEventQueueSize;
	private NamedThreadFactory	threadFactory;
	private boolean			running	= false;
	private ExecutorEventLoopGroup eventLoopGroup;

	public ExecutorPoolEventLoop(
			ExecutorEventLoopGroup eventLoopGroup,
			int eventLoopSize, 
			int maxEventLoopSize, 
			int maxEventQueueSize, 
			long keepAliveTime) {
		this.eventLoopGroup = eventLoopGroup;
		this.eventLoopSize = eventLoopSize;
		this.maxEventLoopSize = maxEventLoopSize;
		this.maxEventQueueSize = maxEventQueueSize;
		this.keepAliveTime = keepAliveTime;
	}

	private ThreadPoolExecutor poolExecutor;

	@Override
	public void dispatch(Runnable job) {
		this.poolExecutor.execute(job);
	}

	@Override
	public void startup(String threadName) throws Exception {
		
		threadFactory = new NamedThreadFactory(threadName);

		poolExecutor = new ThreadPoolExecutor(eventLoopSize, maxEventLoopSize, keepAliveTime, TimeUnit.MILLISECONDS,
				new ArrayBlockingQueue(maxEventQueueSize), threadFactory);
		
		running = true;
	}

	@Override
	public void stop() {
		running = false;
		if (poolExecutor != null) {
			poolExecutor.shutdown();
		}
	}

	@Override
	public boolean inEventLoop() {
		return threadFactory.inFactory(Thread.currentThread());
	}

	@Override
	public boolean inEventLoop(Thread thread) {
		return false;
	}

	@Override
	public Thread getMonitor() {
		throw new UnsupportedOperationException();
	}

	@Override
	public boolean isRunning() {
		return running;
	}

	@Override
	public void loop() {
		throw new UnsupportedOperationException();
	}
	
	@Override
	public void wakeup() {
		throw new UnsupportedOperationException();
	}

	@Override
	public ExecutorEventLoopGroup getEventLoopGroup() {
		return eventLoopGroup;
	}

}