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Java > Open Source Codes > com > sslexplorer > policyframework > LaunchSessionFactory


1 /*
2  * SSL-Explorer
3  *
4  * Copyright (C) 2003-2006 3SP LTD. All Rights Reserved
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version 2 of
9  * the License, or (at your option) any later version.
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public
16  * License along with this program; if not, write to the Free Software
17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18  */
19             
20 package com.sslexplorer.policyframework;
21
22 import org.apache.commons.logging.Log;
23 import org.apache.commons.logging.LogFactory;
24
25 import com.sslexplorer.core.AbstractFactory;
26
27
28 /**
29  * Factory implementation for creating and locating the {@link LaunchSessionManager}.
30  *
31  * @author Brett Smith <a HREF="mailto: brett@3sp.com">&lt;brett@3sp.com&gt;</a>
32  */
33 public class LaunchSessionFactory extends AbstractFactory {
34         
35     static Log log = LogFactory.getLog(LaunchSessionFactory.class);
36
37     static LaunchSessionManager instance;
38     static Class JavaDoc launchSessionManagerImpl = LaunchSessionManager.class;
39     private static boolean locked = false;
40
41     /**
42      * Get an instance of the {@link LaunchSessionFactory}, lazily
43      * creating it.
44      *
45      * @return An instance of the launch session manager.
46      */
47     public static LaunchSessionManager getInstance() {
48         try {
49             return instance == null ? instance = (LaunchSessionManager) launchSessionManagerImpl.newInstance() : instance;
50         } catch (Exception JavaDoc e) {
51             log.error("Could not create instance of class " + launchSessionManagerImpl.getCanonicalName(), e);
52             return instance == null ? instance = new LaunchSessionManager() : instance;
53         }
54     }
55
56
57     /**
58      * Set the factory implementation to use.
59      *
60      * @param launchSessionManagerImpl the class of the launch session manager
61      * @param lock weather to lock the policy database after setting it.
62      * @throws IllegalStateException
63      */
64     public static void setFactoryImpl(Class JavaDoc launchSessionManagerImpl, boolean lock) throws IllegalStateException JavaDoc {
65         if (locked) {
66             throw new IllegalStateException JavaDoc("Policy database factory has been locked by another plugin.");
67         }
68         LaunchSessionFactory.launchSessionManagerImpl = launchSessionManagerImpl;
69         locked = lock;
70     }
71 }
72
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