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Java example source code file (

This example Java source code file ( is included in the "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

exception, ignore, inspectingclient, linkedlist, mutatingclient, override, random, reflectiontostringbuildermutateinspectconcurrencytest, runnable, testfixture, thread, util

The Java example source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.commons.lang3.builder;

import java.util.LinkedList;
import java.util.Random;

import org.junit.Ignore;
import org.junit.Test;

 * Tests concurrent access for {@link ReflectionToStringBuilder}.
 * <p>
 * The {@link ToStringStyle} class includes a registry to avoid infinite loops for objects with circular references. We
 * want to make sure that we do not get concurrency exceptions accessing this registry.
 * </p>
 * @see <a href="">[LANG-762] Handle or document ReflectionToStringBuilder
 *      and ToStringBuilder for collections that are not thread safe</a>
 * @since 3.1
public class ReflectionToStringBuilderMutateInspectConcurrencyTest {

    class TestFixture {
        final private LinkedList<Integer> listField = new LinkedList();
        final private Random random = new Random();
        private final int N = 100;

        public TestFixture() {
            synchronized (this) {
                for (int i = 0; i < N; i++) {

        public synchronized void add() {

        public synchronized void delete() {

    class MutatingClient implements Runnable {
        final private TestFixture testFixture;
        final private Random random = new Random();

        public MutatingClient(final TestFixture testFixture) {
            this.testFixture = testFixture;

        public void run() {
            if (random.nextBoolean()) {
            } else {

    class InspectingClient implements Runnable {
        final private TestFixture testFixture;

        public InspectingClient(final TestFixture testFixture) {
            this.testFixture = testFixture;

        public void run() {

    public void testConcurrency() throws Exception {
        final TestFixture testFixture = new TestFixture();
        final int numMutators = 10;
        final int numIterations = 10;
        for (int i = 0; i < numIterations; i++) {
            for (int j = 0; j < numMutators; j++) {
                final Thread t = new Thread(new MutatingClient(testFixture));
                final Thread s = new Thread(new InspectingClient(testFixture));

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