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org.perfectjpattern.core.behavioral.observer.TestSubject.testFaultyObserverDetached
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org.perfectjpattern.core.behavioral.observer.TestExample.testObserver
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org.perfectjpattern.core.behavioral.observer.TestAsynchronousSubject.testAsynchronousNotification
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org.perfectjpattern.core.behavioral.observer.TestParameterlessSubject.testParameterlessSubject
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org.perfectjpattern.core.behavioral.observer.TestProxyObserver.testObserverPOJO
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org.perfectjpattern.core.behavioral.observer.TestSubject.testSimple
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org.perfectjpattern.core.behavioral.observer.TestSubject.testClear
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org.perfectjpattern.core.behavioral.observer.TestSubject.testSize
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1 | //---------------------------------------------------------------------- | |
2 | // | |
3 | // PerfectJPattern: "Design patterns are good but components are better!" | |
4 | // Subject.java Copyright (c) 2009 Giovanni Azua Garcia | |
5 | // bravegag@hotmail.com | |
6 | // | |
7 | // This program is free software; you can redistribute it and/or | |
8 | // modify it under the terms of the GNU General Public License | |
9 | // as published by the Free Software Foundation; either version 3 | |
10 | // of the License, or (at your option) any later version. | |
11 | // | |
12 | // This program is distributed in the hope that it will be useful, | |
13 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | // GNU General Public License for more details. | |
16 | // | |
17 | // You should have received a copy of the GNU General Public License | |
18 | // along with this program; if not, see <http://www.gnu.org/licenses/>. | |
19 | // | |
20 | //---------------------------------------------------------------------- | |
21 | package org.perfectjpattern.core.behavioral.observer; | |
22 | ||
23 | import java.util.*; | |
24 | ||
25 | import org.apache.commons.lang.*; | |
26 | import org.perfectjpattern.core.api.behavioral.observer.*; | |
27 | import org.slf4j.*; | |
28 | ||
29 | ||
30 | /** | |
31 | * Base core implementation of <code>ISubject</code> interface. | |
32 | * <br/> | |
33 | * | |
34 | * @see ISubject | |
35 | * | |
36 | * @param <E> Type of event data this <code>ISubject</code> | |
37 | * notifies with. | |
38 | * | |
39 | * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a> | |
40 | * @version $Revision: 1.0 $ $Date: Jun 18, 2007 9:06:39 PM $ | |
41 | */ | |
42 | public | |
43 | class Subject<E> | |
44 | implements ISubject<E> | |
45 | { | |
46 | //------------------------------------------------------------------------ | |
47 | // public | |
48 | //------------------------------------------------------------------------ | |
49 | /** | |
50 | * {@inheritDoc} | |
51 | */ | |
52 | 22 |
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53 | attach(IObserver<E>... anObservers) | |
54 | { | |
55 | 22 | Validate.notNull(anObservers, "'anObservers' must not be null"); |
56 | ||
57 | 22 | theObservers.addAll(Arrays.asList(anObservers)); |
58 | } | |
59 | ||
60 | //------------------------------------------------------------------------ | |
61 | /** | |
62 | * {@inheritDoc} | |
63 | */ | |
64 | 1 |
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65 | clear() | |
66 | { | |
67 | 1 | theObservers.clear(); |
68 | } | |
69 | ||
70 | //------------------------------------------------------------------------ | |
71 | /** | |
72 | * {@inheritDoc} | |
73 | */ | |
74 | 10 |
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75 | detach(IObserver<E>... anObservers) | |
76 | { | |
77 | 10 | Validate.notNull(anObservers, "'anObservers' must not be null"); |
78 | ||
79 | 10 | theObservers.removeAll(Arrays.asList(anObservers)); |
80 | } | |
81 | ||
82 | //------------------------------------------------------------------------ | |
83 | /** | |
84 | * {@inheritDoc} | |
85 | */ | |
86 | 68 |
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87 | public void | |
88 | notifyObservers(E anEventData) | |
89 | { | |
90 | 68 | Validate.notNull(anEventData, "'anEventData' must not be null"); |
91 | ||
92 | 68 | IObserver<E>[] myObservers = theObservers.toArray(EMPTY_ARRAY); |
93 | ||
94 | 68 | for (IObserver<E> myObserver : myObservers) |
95 | { | |
96 | 108 | try |
97 | { | |
98 | 108 | myObserver.update(anEventData); |
99 | } | |
100 | //CHECKSTYLE:OFF | |
101 | catch (Throwable anException) | |
102 | //CHECKSTYLE:ON | |
103 | { | |
104 | // faulty Observer instances are automatically detached | |
105 | 1 | detach(myObserver); |
106 | ||
107 | 1 | theLogger.error("Observer '" + System.identityHashCode( |
108 | myObserver) + "' has thrown an unchecked exception on " + | |
109 | "update and has been automatically detached.", | |
110 | anException); | |
111 | } | |
112 | } | |
113 | } | |
114 | ||
115 | //------------------------------------------------------------------------ | |
116 | /** | |
117 | * {@inheritDoc} | |
118 | */ | |
119 | 6 |
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120 | size() | |
121 | { | |
122 | 6 | return theObservers.size(); |
123 | } | |
124 | ||
125 | //------------------------------------------------------------------------ | |
126 | // protected | |
127 | //------------------------------------------------------------------------ | |
128 | /** | |
129 | * Returns the Observer instances | |
130 | * | |
131 | * @return the Observer instances | |
132 | */ | |
133 | 2 |
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134 | getObservers() | |
135 | { | |
136 | 2 | return Collections.unmodifiableCollection(theObservers); |
137 | } | |
138 | ||
139 | //------------------------------------------------------------------------ | |
140 | // members | |
141 | //------------------------------------------------------------------------ | |
142 | /** | |
143 | * Collection of <code>IObserver</code> instances. | |
144 | */ | |
145 | private final Collection<IObserver<E>> theObservers = new ArrayList< | |
146 | IObserver<E>>(); | |
147 | ||
148 | /** | |
149 | * Reusable empty array of <code>IObserver</code> so it does not need | |
150 | * to be recreated each time there is a call to | |
151 | * <code>notifyObservers</code> | |
152 | */ | |
153 | @SuppressWarnings("unchecked") | |
154 | protected static final IObserver[] EMPTY_ARRAY = new IObserver[0]; | |
155 | ||
156 | /** | |
157 | * Provides logging services for this class | |
158 | */ | |
159 | private final Logger theLogger = LoggerFactory.getLogger(this.getClass()); | |
160 | } |
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