Main.java Source code

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Here is the source code for Main.java

Source

//package com.java2s;
/*******************************************************************************
 * Copyright 2014 United States Government as represented by the
 * Administrator of the National Aeronautics and Space Administration.
 * All Rights Reserved.
 * 
 * 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.
 ******************************************************************************/

import java.util.concurrent.ExecutorService;

import java.util.concurrent.LinkedBlockingQueue;

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

public class Main {
    /**
     * Creates a single thread executor which ignores all executions that occur
     * while it is busy executing a Runnable. This is useful for tasks that may
     * be requested multiple times from multiple sources, but which only need to
     * take place once.
     * 
     * @param name the name for threads created within this pool
     */
    @SuppressWarnings("serial")
    public static ExecutorService newCoalescingThreadPool(String name) {
        return new ThreadPoolExecutor(1, 1, 1, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(),
                newNamedThreadFactory(name)) {
            private boolean executing = false;

            @Override
            public void execute(final Runnable command) {
                synchronized (this) {
                    if (executing)
                        return;
                    executing = true;
                }
                super.execute(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            command.run();
                        } finally {
                            executing = false;
                        }
                    }
                });
            }
        };
    }

    public static ThreadFactory newNamedThreadFactory(final String name) {
        return new ThreadFactory() {
            @Override
            public Thread newThread(final Runnable r) {
                Thread t = new Thread(r);
                t.setName(name);
                return t;
            }
        };
    }
}