| /** |
| * 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); |
| } |
| |
| } |