Java Component Examples

LockFreeOrderedList Example

 * Copyright (c) 2008 IBM Corporation
 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.amino.examples;

/*   The ordered list contains ordered items.
 *   This example shows the mainly interfaces of LockFreeList.
 *   Including : add(), remove(), isEmpty(), size(), iterator().
 *   The ListAdder class will add different items of String from "1" to "ELEMENT_NUM".
 *   The ListRemover class will remove no more than ELEMENT_NUM items.
 *   The main thread will wait for all the threads in pool to finish.  
 *   2009/05/22

import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

import org.amino.ds.lockfree.LockFreeOrderedList;

public class OrderedListExample {

    public static final int ELEMENT_NUM = 100;
    private static final int TASKS_NUM = 4;
    public static void main(String[] argvs) {

        ExecutorService exec = Executors.newFixedThreadPool(TASKS_NUM);

        final List<String> listStr = new LockFreeOrderedList<String>();

        // The ListAdder and ListRemover are from
        for (int i = 0; i < TASKS_NUM; ++i) {
            exec.submit(new ListAdder(listStr));
            exec.submit(new ListRemover(listStr));

        // Wait until all the threads in pool to finish.
        try {
            while(!exec.awaitTermination(600, TimeUnit.SECONDS));
        } catch (InterruptedException e) {
        // If the List is empty now, the program will exit.
        if (listStr.isEmpty())
            System.out.println("The List is empty, so I will exit!");
        /* The simple way for printing all the elements in List.
         * The output should be ordered according to the String.compareTo().
        for (String str : listStr)
        System.out.println("List size before clearing: "+ listStr.size());
        System.out.println("List size after clearing: "+ listStr.size());
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