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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 static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import org.apache.commons.lang3.AbstractLangTest;
import org.apache.commons.lang3.concurrent.UncheckedFuture;
import org.junit.jupiter.api.Disabled;
import org.junit.jupiter.api.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>
* <p>
* The tests on the non-thread-safe collections do not pass.
* </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
*/
public class ReflectionToStringBuilderConcurrencyTest extends AbstractLangTest {
static class CollectionHolder<T extends Collection<?>> {
T collection;
CollectionHolder(final T collection) {
this.collection = collection;
}
}
private static final int DATA_SIZE = 100000;
private static final int REPEAT = 100;
@Test
@Disabled
public void testLinkedList() throws InterruptedException {
this.testConcurrency(new CollectionHolder<>(new LinkedList<>()));
}
@Test
@Disabled
public void testArrayList() throws InterruptedException {
this.testConcurrency(new CollectionHolder<>(new ArrayList<>()));
}
@Test
@Disabled
public void testCopyOnWriteArrayList() throws InterruptedException {
this.testConcurrency(new CollectionHolder<>(new CopyOnWriteArrayList<>()));
}
private void testConcurrency(final CollectionHolder<List<Integer>> holder) throws InterruptedException {
final List<Integer> list = holder.collection;
// make a big array that takes a long time to toString()
for (int i = 0; i < DATA_SIZE; i++) {
list.add(Integer.valueOf(i));
}
// Create a thread pool with two threads to cause the most contention on the underlying resource.
final ExecutorService threadPool = Executors.newFixedThreadPool(2);
try {
// Consumes toStrings
final Callable<Integer> consumer = () -> {
for (int i = 0; i < REPEAT; i++) {
final String s = ReflectionToStringBuilder.toString(holder);
assertNotNull(s);
}
return Integer.valueOf(REPEAT);
};
// Produces changes in the list
final Callable<Integer> producer = () -> {
for (int i = 0; i < DATA_SIZE; i++) {
list.remove(list.get(0));
}
return Integer.valueOf(REPEAT);
};
final Collection<Callable<Integer>> tasks = new ArrayList<>();
tasks.add(consumer);
tasks.add(producer);
final List<Future<Integer>> futures = threadPool.invokeAll(tasks);
UncheckedFuture.on(futures).forEach(f -> assertEquals(REPEAT, f.get().intValue()));
} finally {
threadPool.shutdown();
threadPool.awaitTermination(1, TimeUnit.SECONDS);
}
}
}
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