KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > mvnforum > db > MemberCache


1 /*
2  * $Header: /cvsroot/mvnforum/mvnforum/src/com/mvnforum/db/MemberCache.java,v 1.8 2006/04/14 17:05:26 minhnn Exp $
3  * $Author: minhnn $
4  * $Revision: 1.8 $
5  * $Date: 2006/04/14 17:05:26 $
6  *
7  * ====================================================================
8  *
9  * Copyright (C) 2002-2006 by MyVietnam.net
10  *
11  * All copyright notices regarding mvnForum MUST remain
12  * intact in the scripts and in the outputted HTML.
13  * The "powered by" text/logo with a link back to
14  * http://www.mvnForum.com and http://www.MyVietnam.net in
15  * the footer of the pages MUST remain visible when the pages
16  * are viewed on the internet or intranet.
17  *
18  * This program is free software; you can redistribute it and/or modify
19  * it under the terms of the GNU General Public License as published by
20  * the Free Software Foundation; either version 2 of the License, or
21  * any later version.
22  *
23  * This program is distributed in the hope that it will be useful,
24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26  * GNU General Public License for more details.
27  *
28  * You should have received a copy of the GNU General Public License
29  * along with this program; if not, write to the Free Software
30  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31  *
32  * Support can be obtained from support forums at:
33  * http://www.mvnForum.com/mvnforum/index
34  *
35  * Correspondence and Marketing Questions can be sent to:
36  * info at MyVietnam net
37  *
38  * @author: Minh Nguyen
39  * @author: Mai Nguyen
40  */

41 package com.mvnforum.db;
42
43 import net.myvietnam.mvncore.exception.DatabaseException;
44 import net.myvietnam.mvncore.exception.ObjectNotFoundException;
45 import net.myvietnam.mvncore.util.DateUtil;
46
47 import org.apache.commons.logging.Log;
48 import org.apache.commons.logging.LogFactory;
49
50 import com.mvnforum.MVNForumConfig;
51 import com.whirlycott.cache.*;
52
53 public class MemberCache {
54
55     public static final long TIME_OUT = DateUtil.HOUR;
56
57     private static Log log = LogFactory.getLog(MemberCache.class);
58
59     // static singleton variable
60
static private MemberCache instance = new MemberCache();
61
62     // instance variable
63
private Cache cache;
64
65     public MemberCache() {
66         //Use the cache manager to create the default cache
67
try {
68             if (MVNForumConfig.getEnableCacheMember()) {
69                 cache = CacheManager.getInstance().getCache("member");
70             }
71         } catch (CacheException ex) {
72             log.error("Cannot get the WhirlyCache. Member caching is disabled.", ex);
73         } catch (LinkageError JavaDoc e) {
74             // @todo: Should be never throw
75
log.error("Cannot get the WhirlyCache caused by Package Conflict. Member caching is disabled.", e);
76         }
77     }
78
79     /**
80      * Returns the single instance
81      * @return MemberCache : the singleton instance.
82      *
83      * NOTE: if use normal singleton pattern, this method should be synchronized
84      */

85     static public MemberCache getInstance() {
86         return instance;
87     }
88
89     public String JavaDoc getEfficiencyReport() {
90         String JavaDoc result = "No report";
91         if (cache == null) {
92             if (MVNForumConfig.getEnableCacheMember() == false) {
93                 result = "Cache is disabled.";
94             } else {
95                 result = "Cache cannot be inited";
96             }
97         } else if (cache instanceof CacheDecorator) {
98             result = ((CacheDecorator)cache).getEfficiencyReport();
99         }
100         return result;
101     }
102
103     public void clear() {
104         if (cache != null) {
105             cache.clear();
106         }
107     }
108
109     public MemberBean getMember_forPublic(int memberID)
110         throws DatabaseException, ObjectNotFoundException {
111
112         MemberBean memberBean = null;
113         if (cache != null) {
114             String JavaDoc key = new String JavaDoc("getMember_forPublic" + memberID);
115             memberBean = (MemberBean)cache.retrieve(key);
116             if (memberBean == null) {
117                 //log.debug("MemberCache: about to call getMember_forPublic with id = " + memberID);
118
memberBean = DAOFactory.getMemberDAO().getMember_forPublic(memberID);
119                 cache.store(key, memberBean, TIME_OUT);
120             }
121         } else {
122             memberBean = DAOFactory.getMemberDAO().getMember_forPublic(memberID);
123         }
124
125         if (memberBean == null) {
126             throw new ObjectNotFoundException("Cannot find the row in table Member "
127                                           + "where primary key = (" + memberID + ").");
128         }
129         return memberBean;
130     }
131
132 }
133
Popular Tags