wamblee.org Git - utils/blob - support/general/src/test/java/org/wamblee/concurrency/AbstractLockTestCase.java

   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 package org.wamblee.concurrency;
  17
  18 import junit.framework.TestCase;
  19
  20 import org.wamblee.test.EventTracker;
  21 import org.wamblee.test.TimingUtils;
  22
  23
  24 /**
  25  * Tests for the JVMLock.
  26  *
  27  * @author Erik Brakkee
  28  */
  29 public abstract class AbstractLockTestCase extends TestCase {
  30     protected static final int SLEEP_TIME = 1000;
  31     protected static final String STARTED = "started";
  32     protected static final String ACQUIRED = "acquired";
  33     protected static final String RELEASED = "released";
  34     private EventTracker<String> tracker;
  35
  36     /*
  37      * (non-Javadoc)
  38      *
  39      * @see junit.framework.TestCase#setUp()
  40      */
  41     @Override
  42     protected void setUp() throws Exception {
  43         tracker = new EventTracker<String>();
  44     }
  45
  46     protected EventTracker<String> getTracker() {
  47         return tracker;
  48     }
  49
  50     /**
  51      * Must be implemented to generate the events
  52      * {@link #STARTED}, {@link #ACQUIRED}, and {@link #RELEASED} in
  53      * that order. The lock should be acquired for
  54      * the time specified by {@link #SLEEP_TIME}.
  55      * @return Thread which does the work.
  56      */
  57     protected abstract Thread runThread();
  58
  59     /**
  60      * Tests the operation of the lock.
  61      */
  62     public void testLock() throws InterruptedException {
  63         Thread t1 = runThread();
  64         Thread t2 = runThread();
  65         TimingUtils.sleep(SLEEP_TIME / 10); // give threads a chance to start
  66                                             // up.
  67
  68         assertEquals(2, tracker.getEventCount(STARTED)); // both threads
  69                                                          // should have
  70                                                          // started.
  71
  72         assertEquals(1, tracker.getEventCount(ACQUIRED)); // one thread has
  73                                                           // acquired the
  74                                                           // lock.
  75
  76         TimingUtils.sleep(SLEEP_TIME);
  77         assertEquals(2, tracker.getEventCount(ACQUIRED)); // now the other
  78                                                           // thread could also
  79                                                           // acquire the lock
  80
  81         assertEquals(1, tracker.getEventCount(RELEASED)); // and the first
  82                                                           // thread has
  83                                                           // released it.
  84
  85         TimingUtils.sleep(SLEEP_TIME);
  86         assertEquals(2, tracker.getEventCount(RELEASED)); // both threads
  87                                                           // should be
  88                                                           // finished.
  89
  90         t1.join();
  91         t2.join();
  92     }
  93 }