| /** |
| * 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.activemq.usage; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertNotNull; |
| import static org.junit.Assert.assertTrue; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.ThreadPoolExecutor; |
| import java.util.concurrent.TimeUnit; |
| import org.junit.After; |
| import org.junit.Before; |
| import org.junit.Test; |
| |
| public class MemoryUsageTest { |
| |
| MemoryUsage underTest; |
| ThreadPoolExecutor executor; |
| |
| @Test |
| public final void testPercentUsageNeedsNoThread() { |
| int activeThreadCount = Thread.activeCount(); |
| underTest.setLimit(10); |
| underTest.start(); |
| underTest.increaseUsage(1); |
| assertEquals("usage is correct", 10, underTest.getPercentUsage()); |
| assertEquals("no new thread created withough listener or callback",activeThreadCount, Thread.activeCount()); |
| } |
| |
| @Test |
| public final void testAddUsageListenerStartsThread() throws Exception { |
| int activeThreadCount = Thread.activeCount(); |
| underTest = new MemoryUsage(); |
| underTest.setExecutor(executor); |
| underTest.setLimit(10); |
| underTest.start(); |
| final CountDownLatch called = new CountDownLatch(1); |
| final String[] listnerThreadNameHolder = new String[1]; |
| underTest.addUsageListener(new UsageListener() { |
| public void onUsageChanged(Usage usage, int oldPercentUsage, |
| int newPercentUsage) { |
| called.countDown(); |
| listnerThreadNameHolder[0] = Thread.currentThread().toString(); |
| } |
| }); |
| underTest.increaseUsage(1); |
| assertTrue("listner was called", called.await(30, TimeUnit.SECONDS)); |
| assertTrue("listner called from another thread", !Thread.currentThread().toString().equals(listnerThreadNameHolder[0])); |
| assertEquals("usage is correct", 10, underTest.getPercentUsage()); |
| assertEquals("new thread created with listener", activeThreadCount + 1, Thread.activeCount()); |
| } |
| |
| @Before |
| public void setUp() throws Exception { |
| underTest = new MemoryUsage(); |
| this.executor = new ThreadPoolExecutor(1, 10, 30, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(), new ThreadFactory() { |
| public Thread newThread(Runnable runnable) { |
| Thread thread = new Thread(runnable, "Usage Async Task"); |
| thread.setDaemon(true); |
| return thread; |
| } |
| }); |
| underTest.setExecutor(this.executor); |
| |
| } |
| |
| @After |
| public void tearDown() { |
| assertNotNull(underTest); |
| underTest.stop(); |
| if (this.executor != null) { |
| this.executor.shutdownNow(); |
| } |
| } |
| } |