1 /*
   2  * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 7192275
  27  * @summary Basic test of addPropertyListener/removePropertyListener methods
  28  * @run main/othervm Listeners
  29  */
  30 
  31 import java.util.logging.LogManager;
  32 import java.beans.PropertyChangeListener;
  33 import java.beans.PropertyChangeEvent;
  34 
  35 public class Listeners {
  36 
  37     static void assertTrue(boolean result, String msg) {
  38         if (!result)
  39             throw new RuntimeException(msg);
  40     }
  41 
  42     /**
  43      * A {@code PropertyChangeListener} that counts the number of times that
  44      * the {@code propertyChange} method is fired, and also checks that the
  45      * event source is the expected (fixed) object.
  46      */
  47     static class Listener implements PropertyChangeListener {
  48         private final Object expectedSource;
  49         private int fireCount;
  50 
  51         Listener(Object expectedSource) {
  52             this.expectedSource = expectedSource;
  53         }
  54 
  55         int fireCount() {
  56             return fireCount;
  57         }
  58 
  59         Listener reset() {
  60             fireCount = 0;
  61             return this;
  62         }
  63 
  64         @Override
  65         public void propertyChange(PropertyChangeEvent evt) {
  66             assertTrue(evt.getSource() == expectedSource, "Unexpected source");
  67             fireCount++;
  68         }
  69     }
  70 
  71     /**
  72      * Tests that the given listeners are invoked the expected number of
  73      * times.
  74      */
  75     static void test(Listener[] listeners, int... expected) throws Exception {
  76         // reset counts
  77         for (Listener listener : listeners) {
  78             listener.reset();
  79         }
  80 
  81         // re-reading configuration causes events to be fired
  82         LogManager.getLogManager().readConfiguration();
  83 
  84         // check event listeners invoked as expected
  85         for (int i = 0; i < expected.length; i++) {
  86             assertTrue(listeners[i].fireCount() == expected[i],
  87                 "Unexpected event count");
  88         }
  89     }
  90 
  91     @SuppressWarnings("deprecation")
  92     public static void main(String[] args) throws Exception {
  93         LogManager logman = LogManager.getLogManager();
  94 
  95         Listener[] listeners = new Listener[2];
  96         Listener listener1 = listeners[0] = new Listener(LogManager.class);
  97         Listener listener2 = listeners[1] = new Listener(LogManager.class);
  98 
  99         // add listeners
 100         logman.addPropertyChangeListener(listener1);
 101         test(listeners, 1, 0);
 102 
 103         logman.addPropertyChangeListener(listener1);
 104         test(listeners, 2, 0);
 105 
 106         logman.addPropertyChangeListener(listener2);
 107         test(listeners, 2, 1);
 108 
 109         // null handling to check for impact on the existing registrations
 110         try {
 111             logman.addPropertyChangeListener(null);
 112             assertTrue(false, "NullPointerException expected");
 113         } catch (NullPointerException expected) { }
 114         test(listeners, 2, 1);
 115 
 116         logman.removePropertyChangeListener(null);  // no-op
 117         test(listeners, 2, 1);
 118 
 119         // remove listeners
 120         logman.removePropertyChangeListener(listener1);
 121         test(listeners, 1, 1);
 122 
 123         logman.removePropertyChangeListener(listener1);
 124         test(listeners, 0, 1);
 125 
 126         logman.removePropertyChangeListener(listener1);  // no-op
 127         test(listeners, 0, 1);
 128 
 129         logman.removePropertyChangeListener(listener2);
 130         test(listeners, 0, 0);
 131 
 132         logman.removePropertyChangeListener(listener2);  // no-op
 133         test(listeners, 0, 0);
 134     }
 135 }