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1   //----------------------------------------------------------------------
2   // 
3   // PerfectJPattern: "Design patterns are good but components are better!" 
4   // ISingleton.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.api.creational.singleton;
22  
23  /**
24   * <b>Singleton Design Pattern</b>: Ensure a class has only one instance 
25   * and provide a global point of access to it. (Gamma et al, Design Patterns)
26   * <br/><br/>
27   * 
28   * <b>Responsibility</b> Singleton: <br/>
29   * <br/>
30   * <ul>
31   * <li>Defines an Instance operation that lets clients access its unique 
32   * instance. Instance is a class operation.</li>
33   * <li>Responsible for creating and maintaining its own unique instance.</li>
34   * </ul>
35   * 
36   * @author <a href="mailto:bravegag@hotmail.com">Giovanni Azua</a>
37   * @version $Revision: 1.0 $Date: Sep 21, 2008 2:25:28 PM $
38   */
39  public 
40  interface ISingleton
41  {
42      // marker interface    
43  }