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Java > Open Source Codes > org > jboss > aspects > patterns > observable > Subject


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software 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 GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.aspects.patterns.observable;
23
24 /**
25  * A Subject. This interface is exposed on the advised object.
26  *
27  * @author <a HREF="adrian@jboss.com">Adrian Brock</a>
28  * @version $Revision: 37406 $
29  */
30 public interface Subject
31 {
32    /**
33     * Add an observer
34     *
35     * @param observer the observer
36     */
37    void addObserver(Observer observer);
38    
39    /**
40     * Remove an observer
41     *
42     * @param observer the observer
43     */
44    void removeObserver(Observer observer);
45    
46    /**
47     * Notify all observers
48     */
49    void notifyObservers();
50 }
51
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