A test to reproduce Gson concurrency bug. See issue 63.

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Inderjeet Singh 2008-10-20 19:48:38 +00:00
parent 9f5a2086de
commit 0acb151941

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/*
* Copyright (C) 2008 Google Inc.
*
* 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.
*/
package com.google.gson.functional;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean;
import junit.framework.TestCase;
import com.google.gson.Gson;
/**
* Tests for ensuring Gson thread-safety.
*
* @author Inderjeet Singh
* @author Joel Leitch
*/
public class ConcurrencyTest extends TestCase {
private Gson gson;
@Override
protected void setUp() throws Exception {
super.setUp();
gson = new Gson();
}
/**
* Source-code based on
* http://groups.google.com/group/google-gson/browse_thread/thread/563bb51ee2495081
*/
public void testSingleThread() {
MyObject myObj = new MyObject("hello", "world", 42);
for (int i = 0; i < 10; i++) {
gson.toJson(myObj);
}
}
/**
* Source-code based on
* http://groups.google.com/group/google-gson/browse_thread/thread/563bb51ee2495081
*/
public void testMultiThread() throws InterruptedException {
final CountDownLatch startLatch = new CountDownLatch(1);
final CountDownLatch finishedLatch = new CountDownLatch(10);
final AtomicBoolean failed = new AtomicBoolean(false);
ExecutorService executor = Executors.newFixedThreadPool(10);
for (int taskCount = 0; taskCount < 10; taskCount++) {
executor.execute(new Runnable() {
public void run() {
MyObject myObj = new MyObject();
try {
startLatch.await();
for (int i = 0; i < 10; i++) {
String json = gson.toJson(myObj);
}
} catch (Throwable t) {
failed.set(true);
} finally {
finishedLatch.countDown();
}
}
});
}
startLatch.countDown();
finishedLatch.await();
assertFalse(failed.get());
}
private static class MyObject {
private String a;
private String b;
private int i;
MyObject() {
this("hello", "world", 42);
}
public MyObject(String a, String b, int i) {
this.a = a;
this.b = b;
this.i = i;
}
}
}