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/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    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 org.deeplearning4j.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;
import java.util.concurrent.*;

public class MultiThreadUtils {

	private static Logger log = LoggerFactory.getLogger(MultiThreadUtils.class);

	private static ExecutorService instance;

	private MultiThreadUtils() {
	}

	public static synchronized ExecutorService newExecutorService() {
		int nThreads = Runtime.getRuntime().availableProcessors();
		return new ThreadPoolExecutor(nThreads, nThreads, 60L, TimeUnit.SECONDS,
				new LinkedTransferQueue(),
				new ThreadFactory() {
					@Override
					public Thread newThread(Runnable r) {
						Thread t = Executors.defaultThreadFactory().newThread(r);
						t.setDaemon(true);
						return t;
					}
				});
	}

	public static void parallelTasks(final List tasks, ExecutorService executorService) {
		int tasksCount = tasks.size();
		final CountDownLatch latch = new CountDownLatch(tasksCount);
		for(int i=0;i