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/*
* 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
*
* 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.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="https://issues.apache.org/jira/browse/LANG-762">[LANG-762] Handle or document ReflectionToStringBuilder
* and ToStringBuilder for collections that are not thread safe</a>
* @since 3.1
* @version $Id$
*/
public class ReflectionToStringBuilderMutateInspectConcurrencyTest {
class TestFixture {
final private LinkedList<Integer> listField = new LinkedList<Integer>();
final private Random random = new Random();
private int N = 100;
public TestFixture() {
synchronized (this) {
for (int i = 0; i < N; i++) {
listField.add(Integer.valueOf(i));
}
}
}
public synchronized void add() {
listField.add(Integer.valueOf(random.nextInt(N)));
}
public synchronized void delete() {
listField.remove(Integer.valueOf(random.nextInt(N)));
}
}
class MutatingClient implements Runnable {
final private TestFixture testFixture;
final private Random random = new Random();
public MutatingClient(TestFixture testFixture) {
this.testFixture = testFixture;
}
@Override
public void run() {
if (random.nextBoolean()) {
testFixture.add();
} else {
testFixture.delete();
}
}
}
class InspectingClient implements Runnable {
final private TestFixture testFixture;
public InspectingClient(TestFixture testFixture) {
this.testFixture = testFixture;
}
@Override
public void run() {
ReflectionToStringBuilder.toString(testFixture);
}
}
@Test
@Ignore
public void testConcurrency() throws Exception {
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++) {
Thread t = new Thread(new MutatingClient(testFixture));
t.start();
Thread s = new Thread(new InspectingClient(testFixture));
s.start();
}
}
}
}
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