wamblee.org Git - utils/blob

   1 /*
   2  * Copyright 2005 the original author or authors.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package org.wamblee.concurrency;
  18
  19 import org.wamblee.test.EventTracker;
  20 import org.wamblee.test.TimingUtils;
  21
  22 import junit.framework.TestCase;
  23
  24 /**
  25  * Tests for the JVMLock.
  26  */
  27 public abstract class AbstractLockTestCase extends TestCase {
  28
  29     protected static final int SLEEP_TIME = 1000;
  30
  31     protected static final String STARTED = "started";
  32
  33     protected static final String ACQUIRED = "acquired";
  34
  35     protected static final String RELEASED = "released";
  36
  37     private EventTracker<String> _tracker;
  38
  39     /*
  40      * (non-Javadoc)
  41      *
  42      * @see junit.framework.TestCase#setUp()
  43      */
  44     @Override
  45     protected void setUp() throws Exception {
  46         _tracker = new EventTracker<String>();
  47     }
  48
  49     protected EventTracker<String> getTracker() {
  50         return _tracker;
  51     }
  52
  53     /**
  54      * Must be implemented to generate the events
  55      * {@link #STARTED}, {@link #ACQUIRED}, and {@link #RELEASED} in
  56      * that order. The lock should be acquired for
  57      * the time specified by {@link #SLEEP_TIME}.
  58      * @return Thread which does the work.
  59      */
  60     protected abstract Thread runThread();
  61
  62     /**
  63      * Tests the operation of the lock.
  64      */
  65     public void testLock() throws InterruptedException {
  66         Thread t1 = runThread();
  67         Thread t2 = runThread();
  68         TimingUtils.sleep(SLEEP_TIME / 10); // give threads a chance to start
  69         // up.
  70         assertEquals(2, _tracker.getEventCount(STARTED)); // both threads
  71         // should have
  72         // started.
  73         assertEquals(1, _tracker.getEventCount(ACQUIRED)); // one thread has
  74                                                             // acquired the
  75                                                             // lock.
  76         TimingUtils.sleep(SLEEP_TIME);
  77         assertEquals(2, _tracker.getEventCount(ACQUIRED)); // now the other
  78                                                             // thread could also
  79                                                             // acquire the lock
  80         assertEquals(1, _tracker.getEventCount(RELEASED)); // and the first
  81                                                             // thread has
  82                                                             // released it.
  83         TimingUtils.sleep(SLEEP_TIME);
  84         assertEquals(2, _tracker.getEventCount(RELEASED)); // both threads
  85                                                             // should be
  86                                                             // finished.
  87         t1.join();
  88         t2.join();
  89     }
  90 }