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Java example source code file (MultiThreadUtils.java)

This example Java source code file (MultiThreadUtils.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

countdownlatch, executorservice, linkedtransferqueue, list, logger, multithreadutils, override, runnable, runtimeexception, thread, threadfactory, threading, threadpoolexecutor, threads, unchecked, util

The MultiThreadUtils.java Java example source code

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

	public static void parallelTasks(final List<Runnable> tasks, ExecutorService executorService) {
		int tasksCount = tasks.size();
		final CountDownLatch latch = new CountDownLatch(tasksCount);
		for(int i=0;i<tasksCount;i++) {
			final int taskIdx = i;
			executorService.execute(new Runnable() {
				public void run() {
					try {
					} catch(Throwable e){
						log.info("Unchecked exception thrown by task",e);
					} finally {
		try {
		} catch (Exception e) {
			throw new RuntimeException(e);

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