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   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  * @author Erik Brakkee
  28  */
  29 public abstract class AbstractLockTestCase extends TestCase {
  30
  31     protected static final int SLEEP_TIME = 1000;
  32
  33     protected static final String STARTED = "started";
  34
  35     protected static final String ACQUIRED = "acquired";
  36
  37     protected static final String RELEASED = "released";
  38
  39     private EventTracker<String> _tracker;
  40
  41     /*
  42      * (non-Javadoc)
  43      *
  44      * @see junit.framework.TestCase#setUp()
  45      */
  46     @Override
  47     protected void setUp() throws Exception {
  48         _tracker = new EventTracker<String>();
  49     }
  50
  51     protected EventTracker<String> getTracker() {
  52         return _tracker;
  53     }
  54
  55     /**
  56      * Must be implemented to generate the events
  57      * {@link #STARTED}, {@link #ACQUIRED}, and {@link #RELEASED} in
  58      * that order. The lock should be acquired for
  59      * the time specified by {@link #SLEEP_TIME}.
  60      * @return Thread which does the work.
  61      */
  62     protected abstract Thread runThread();
  63
  64     /**
  65      * Tests the operation of the lock.
  66      */
  67     public void testLock() throws InterruptedException {
  68         Thread t1 = runThread();
  69         Thread t2 = runThread();
  70         TimingUtils.sleep(SLEEP_TIME / 10); // give threads a chance to start
  71         // up.
  72         assertEquals(2, _tracker.getEventCount(STARTED)); // both threads
  73         // should have
  74         // started.
  75         assertEquals(1, _tracker.getEventCount(ACQUIRED)); // one thread has
  76                                                             // acquired the
  77                                                             // lock.
  78         TimingUtils.sleep(SLEEP_TIME);
  79         assertEquals(2, _tracker.getEventCount(ACQUIRED)); // now the other
  80                                                             // thread could also
  81                                                             // acquire the lock
  82         assertEquals(1, _tracker.getEventCount(RELEASED)); // and the first
  83                                                             // thread has
  84                                                             // released it.
  85         TimingUtils.sleep(SLEEP_TIME);
  86         assertEquals(2, _tracker.getEventCount(RELEASED)); // both threads
  87                                                             // should be
  88                                                             // finished.
  89         t1.join();
  90         t2.join();
  91     }
  92 }