/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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.kuali.rice.test;

 import org.junit.Assert;

 import java.util.ArrayList;

 import java.util.List;

 /**

  * Some tests will spawn threads which we want to wait for completion on before we move onto the

  * next test.  The ThreadMonitor is a place where those outstanding thread can be stored

  * and handled by the test harnesses tearDown method.

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  *

  */

 public class ThreadMonitor {

         private static List<Thread> threads = new ArrayList<Thread>();

         public static void addThread(Thread thread) {

                 threads.add(thread);

         }

         /**

          * Waits for all outstanding monitored threads to complete.  If the

          * specified timeout is exceeded for any given thread then the test

          * will fail.

          * 

          * @param maxWait maximum number of milliseconds to wait for any particular thread to die

          */

         public static void tearDown(long maxWait) {

                 Thread thread = null;

                 try {

                         for (Thread t : threads) {

                                 thread = t;

                                 thread.join(maxWait);        

                         }

                 } catch (InterruptedException e) {

                         Assert.fail("Failed to wait for test thread to complete: " + (thread == null ? null : thread.getName()));

                 } finally {

                         threads.clear();

                 }

         }

 }