127 lines
3.8 KiB
Java
127 lines
3.8 KiB
Java
/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.util;
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import org.junit.Test;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicReference;
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import static org.hamcrest.CoreMatchers.is;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertThat;
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import static org.junit.Assert.fail;
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public class ThreadDeathWatcherTest {
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@Test(timeout = 10000)
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public void testWatch() throws Exception {
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final CountDownLatch latch = new CountDownLatch(1);
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final Thread t = new Thread() {
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@Override
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public void run() {
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for (;;) {
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try {
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Thread.sleep(1000);
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} catch (InterruptedException ignore) {
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break;
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}
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}
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}
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};
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final Runnable task = () -> {
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if (!t.isAlive()) {
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latch.countDown();
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}
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};
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try {
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ThreadDeathWatcher.watch(t, task);
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fail("must reject to watch a non-alive thread.");
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} catch (IllegalArgumentException e) {
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// expected
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}
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t.start();
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ThreadDeathWatcher.watch(t, task);
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// As long as the thread is alive, the task should not run.
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assertThat(latch.await(750, TimeUnit.MILLISECONDS), is(false));
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// Interrupt the thread to terminate it.
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t.interrupt();
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// The task must be run on termination.
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latch.await();
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}
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@Test(timeout = 10000)
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public void testUnwatch() throws Exception {
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final AtomicBoolean run = new AtomicBoolean();
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final Thread t = new Thread() {
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@Override
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public void run() {
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for (;;) {
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try {
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Thread.sleep(1000);
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} catch (InterruptedException ignore) {
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break;
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}
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}
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}
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};
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final Runnable task = () -> run.set(true);
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t.start();
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// Watch and then unwatch.
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ThreadDeathWatcher.watch(t, task);
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ThreadDeathWatcher.unwatch(t, task);
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// Interrupt the thread to terminate it.
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t.interrupt();
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// Wait until the thread dies.
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t.join();
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// Wait until the watcher thread terminates itself.
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assertThat(ThreadDeathWatcher.awaitInactivity(Long.MAX_VALUE, TimeUnit.SECONDS), is(true));
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// And the task should not run.
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assertThat(run.get(), is(false));
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}
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@Test(timeout = 2000)
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public void testThreadGroup() throws InterruptedException {
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final ThreadGroup group = new ThreadGroup("group");
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final AtomicReference<ThreadGroup> capturedGroup = new AtomicReference<>();
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final Thread thread = new Thread(group, () -> {
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final Thread t = ThreadDeathWatcher.threadFactory.newThread(() -> {
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});
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capturedGroup.set(t.getThreadGroup());
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});
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thread.start();
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thread.join();
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assertEquals(group, capturedGroup.get());
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}
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}
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