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Java example source code file (AbstractConcurrentInitializerTest.java)
The AbstractConcurrentInitializerTest.java Java example source code/* * 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.commons.lang3.concurrent; import static org.junit.Assert.assertEquals; import static org.junit.Assert.assertNotNull; import java.util.concurrent.CountDownLatch; import org.junit.Test; /** * <p> * An abstract base class for tests of concrete {@code ConcurrentInitializer} * implementations. * </p> * <p> * This class provides some basic tests for initializer implementations. Derived * class have to create a {@link ConcurrentInitializer} object on which the * tests are executed. * </p> */ public abstract class AbstractConcurrentInitializerTest { /** * Tests a simple invocation of the get() method. * * @throws org.apache.commons.lang3.concurrent.ConcurrentException because the object under test may throw it */ @Test public void testGet() throws ConcurrentException { assertNotNull("No managed object", createInitializer().get()); } /** * Tests whether sequential get() invocations always return the same * instance. * * @throws org.apache.commons.lang3.concurrent.ConcurrentException because the object under test may throw it */ @Test public void testGetMultipleTimes() throws ConcurrentException { final ConcurrentInitializer<Object> initializer = createInitializer(); final Object obj = initializer.get(); for (int i = 0; i < 10; i++) { assertEquals("Got different object at " + i, obj, initializer.get()); } } /** * Tests whether get() can be invoked from multiple threads concurrently. * Always the same object should be returned. * * @throws org.apache.commons.lang3.concurrent.ConcurrentException because the object under test may throw it * @throws java.lang.InterruptedException because the threading API my throw it */ @Test public void testGetConcurrent() throws ConcurrentException, InterruptedException { final ConcurrentInitializer<Object> initializer = createInitializer(); final int threadCount = 20; final CountDownLatch startLatch = new CountDownLatch(1); class GetThread extends Thread { Object object; @Override public void run() { try { // wait until all threads are ready for maximum parallelism startLatch.await(); // access the initializer object = initializer.get(); } catch (final InterruptedException iex) { // ignore } catch (final ConcurrentException cex) { object = cex; } } } final GetThread[] threads = new GetThread[threadCount]; for (int i = 0; i < threadCount; i++) { threads[i] = new GetThread(); threads[i].start(); } // fire all threads and wait until they are ready startLatch.countDown(); for (final Thread t : threads) { t.join(); } // check results final Object managedObject = initializer.get(); for (final GetThread t : threads) { assertEquals("Wrong object", managedObject, t.object); } } /** * Creates the {@link ConcurrentInitializer} object to be tested. This * method is called whenever the test fixture needs to be obtained. * * @return the initializer object to be tested */ protected abstract ConcurrentInitializer<Object> createInitializer(); } Other Java examples (source code examples)Here is a short list of links related to this Java AbstractConcurrentInitializerTest.java source code file: |
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