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-/*
- *
- * 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.qpid.junit.concurrency;
-
-import org.apache.log4j.Logger;
-
-/**
- * An example to illustrate the use of the {@link ThreadTestCoordinator} and {@link TestRunnable}s.
- *
- * <p/><table id="crc"><caption>CRC Card</caption>
- * <tr><th> Responsibilities <th> Collaborations
- * <tr><td> Demo multi-threaded testing.
- * </table>
- *
- * @author Rupert Smith
- */
-public class ThreadTestExample
-{
- /** Used for logging. */
- private static final Logger log = Logger.getLogger(ThreadTestExample.class);
-
- /** Test thread 1. */
- TestRunnable testThread1 =
- new TestRunnable()
- {
- public void runWithExceptions() throws Exception
- {
- log.debug("public void run(): called");
- log.info("in testThread0, block 1");
-
- // Wait for t2 to allow t1 to continue.
- allow(new int[] { 1 });
- waitFor(new int[] { 1 }, false);
-
- log.info("in testThread0, block 2");
-
- // Wait for t2 to allow t1 to continue. T2 is allowed to be blocked elsewhere than giving explicit
- // permission to allow t1 to continue.
- allow(new int[] { 1 });
- waitFor(new int[] { 1 }, true);
-
- log.info("in testThread0, block 3");
-
- // Release thread 2 from waiting on the shared lock.
- synchronized (sharedLock)
- {
- sharedLock.notifyAll();
- }
-
- allow(new int[] { 1 });
- }
- };
-
- /** A shared lock between the test threads. */
- final Object sharedLock = new Object();
-
- /** Test thread 2. */
- TestRunnable testThread2 =
- new TestRunnable()
- {
- public void runWithExceptions() throws Exception
- {
- log.debug("public void run(): called");
- log.info("in testThread1, block 1");
-
- // Wait for t1 to allow t2 to continue.
- allow(new int[] { 0 });
- waitFor(new int[] { 0 }, false);
-
- log.info("in testThread1, block 2");
-
- // Wait on another resource. T1 should accept this as permission to continue.
- try
- {
- synchronized (sharedLock)
- {
- log.debug("in testThread1, waiting on shared lock.");
- sharedLock.wait();
- }
- }
- catch (InterruptedException e)
- {
- // Bail-out with a runtime if this happens.
- throw new RuntimeException("Interrupted whilst waiting for shared lock.", e);
- }
-
- log.info("in testThread1, finished waiting on shared lock.");
-
- // allow(new int[] { 0 });
-
- // Wait for t1 to allow t2 to continue.
- waitFor(new int[] { 0 }, false);
-
- log.info("in testThread1, block 3");
-
- allow(new int[] { 0 });
- }
- };
-
- /**
- * Executes the test threads with coordination.
- *
- * @param args Ignored.
- */
- public void main(String[] args)
- {
- ThreadTestCoordinator tt = new ThreadTestCoordinator(2);
-
- tt.addTestThread(testThread1, 0);
- tt.addTestThread(testThread2, 1);
- tt.setDeadlockTimeout(500);
- tt.run();
-
- String errorMessage = tt.joinAndRetrieveMessages();
-
- // Print any error messages or exceptions.
- log.info(errorMessage);
-
- if (!tt.getExceptions().isEmpty())
- {
- for (Exception e : tt.getExceptions())
- {
- log.warn("Exception thrown during test thread: ", e);
- }
- }
- }
-}