/**
* 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.hadoop.test;
import static org.junit.Assert.*;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Test;
import org.apache.hadoop.test.MultithreadedTestUtil.TestContext;
import org.apache.hadoop.test.MultithreadedTestUtil.TestingThread;
import org.apache.hadoop.test.MultithreadedTestUtil.RepeatingTestThread;
import org.apache.hadoop.util.Time;
public class TestMultithreadedTestUtil {
private static final String FAIL_MSG =
"Inner thread fails an assert";
@Test
public void testNoErrors() throws Exception {
final AtomicInteger threadsRun = new AtomicInteger();
TestContext ctx = new TestContext();
for (int i = 0; i < 3; i++) {
ctx.addThread(new TestingThread(ctx) {
@Override
public void doWork() throws Exception {
threadsRun.incrementAndGet();
}
});
}
assertEquals(0, threadsRun.get());
ctx.startThreads();
long st = Time.now();
ctx.waitFor(30000);
long et = Time.now();
// All threads should have run
assertEquals(3, threadsRun.get());
// Test shouldn't have waited the full 30 seconds, since
// the threads exited faster than that.
assertTrue("Test took " + (et - st) + "ms",
et - st < 5000);
}
@Test
public void testThreadFails() throws Exception {
TestContext ctx = new TestContext();
ctx.addThread(new TestingThread(ctx) {
@Override
public void doWork() throws Exception {
fail(FAIL_MSG);
}
});
ctx.startThreads();
long st = Time.now();
try {
ctx.waitFor(30000);
fail("waitFor did not throw");
} catch (RuntimeException rte) {
// expected
assertEquals(FAIL_MSG, rte.getCause().getMessage());
}
long et = Time.now();
// Test shouldn't have waited the full 30 seconds, since
// the thread throws faster than that
assertTrue("Test took " + (et - st) + "ms",
et - st < 5000);
}
@Test
public void testThreadThrowsCheckedException() throws Exception {
TestContext ctx = new TestContext();
ctx.addThread(new TestingThread(ctx) {
@Override
public void doWork() throws Exception {
throw new IOException("my ioe");
}
});
ctx.startThreads();
long st = Time.now();
try {
ctx.waitFor(30000);
fail("waitFor did not throw");
} catch (RuntimeException rte) {
// expected
assertEquals("my ioe", rte.getCause().getMessage());
}
long et = Time.now();
// Test shouldn't have waited the full 30 seconds, since
// the thread throws faster than that
assertTrue("Test took " + (et - st) + "ms",
et - st < 5000);
}
@Test
public void testRepeatingThread() throws Exception {
final AtomicInteger counter = new AtomicInteger();
TestContext ctx = new TestContext();
ctx.addThread(new RepeatingTestThread(ctx) {
@Override
public void doAnAction() throws Exception {
counter.incrementAndGet();
}
});
ctx.startThreads();
long st = Time.now();
ctx.waitFor(3000);
ctx.stop();
long et = Time.now();
long elapsed = et - st;
// Test should have waited just about 3 seconds
assertTrue("Test took " + (et - st) + "ms",
Math.abs(elapsed - 3000) < 500);
// Counter should have been incremented lots of times in 3 full seconds
assertTrue("Counter value = " + counter.get(),
counter.get() > 1000);
}
}