| /** |
| * 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.openejb.util; |
| |
| import java.lang.reflect.Method; |
| import java.math.BigDecimal; |
| import java.util.concurrent.CancellationException; |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| import junit.framework.TestCase; |
| |
| public class AsynchronousRunnerTest extends TestCase { |
| |
| private static class TestExecutor implements Executor { |
| |
| private CountDownLatch countDownLatch; |
| |
| public TestExecutor(CountDownLatch countDownLatch) { |
| this.countDownLatch = countDownLatch; |
| } |
| |
| public void execute(final Runnable command) { |
| Runnable runnable = new Runnable() { |
| public void run() { |
| try { |
| countDownLatch.await(); |
| } catch (InterruptedException e) { |
| throw new IllegalStateException(e); |
| } |
| command.run(); |
| } |
| }; |
| new Thread(runnable).start(); |
| } |
| } |
| |
| /** |
| * Tests the cancel method |
| */ |
| public void testCancel() throws Exception { |
| CountDownLatch cdl = new CountDownLatch(1); |
| AsynchronousRunner asyncRunner = instantiate(cdl); |
| Future<Object> future = asyncRunner.runAsync(object(), method(), arguments()); |
| future.cancel(true); |
| assertTrue(future.isCancelled()); |
| try { |
| future.get(); |
| fail(); |
| } catch (CancellationException e) { |
| //Ok |
| } |
| } |
| |
| /** |
| * A delayed get, sleeping until the result is complete |
| */ |
| public void testDelayedGet() throws Exception { |
| CountDownLatch cdl = new CountDownLatch(1); |
| AsynchronousRunner asyncRunner = instantiate(cdl); |
| Future<Object> future = asyncRunner.runAsync(object(), method(), arguments()); |
| assertFalse(future.isDone()); |
| cdl.countDown(); |
| //Give some time for the execution to finish |
| Thread.sleep(500); |
| assertTrue(future.isDone()); |
| assertEquals(expected(), future.get()); |
| } |
| |
| /** |
| * A regular get, waiting for result to be complete |
| */ |
| public void testGet() throws Exception { |
| CountDownLatch cdl = new CountDownLatch(0); |
| AsynchronousRunner asyncRunner = instantiate(cdl); |
| Future<Object> future = asyncRunner.runAsync(object(), method(), arguments()); |
| assertEquals(expected(), future.get()); |
| } |
| |
| /** |
| * A get with max timeout |
| */ |
| public void testTimedGet() throws Exception { |
| CountDownLatch cdl = new CountDownLatch(1); |
| AsynchronousRunner asyncRunner = instantiate(cdl); |
| Future<Object> future = asyncRunner.runAsync(object(), method(), arguments()); |
| try { |
| future.get(1, TimeUnit.SECONDS); |
| fail(); |
| } catch (TimeoutException e) { |
| //Ok |
| } |
| cdl.countDown(); |
| //Give some time for the execution to finish |
| Thread.sleep(500); |
| assertTrue(future.isDone()); |
| assertEquals(expected(), future.get()); |
| } |
| |
| private Object[] arguments() { |
| return new Object[] {BigDecimal.ONE}; |
| } |
| |
| private BigDecimal expected() { |
| return new BigDecimal(11); |
| } |
| |
| private AsynchronousRunner instantiate(final CountDownLatch cdl) { |
| return new AsynchronousRunner(new TestExecutor(cdl)); |
| } |
| |
| private Method method() { |
| try { |
| return BigDecimal.class.getMethod("add", BigDecimal.class); |
| } catch (Exception e) { |
| throw new IllegalStateException(e); |
| } |
| } |
| |
| private Object object() { |
| return BigDecimal.TEN; |
| } |
| |
| } |
| |