KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > com > caucho > amber > AmberContext


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free Software Foundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.amber;
30
31 import com.caucho.util.L10N;
32
33 import java.sql.SQLException JavaDoc;
34
35 /**
36  * Context for amber.
37  */
38 public class AmberContext {
39   private static final L10N L = new L10N(AmberContext.class);
40   
41   private static final ThreadLocal JavaDoc<AmberContext> _localContext
42     = new ThreadLocal JavaDoc<AmberContext>();
43
44   private AmberFactory _factory;
45   private int _depth;
46   private AmberConnection _aConn;
47
48   /**
49    * Creates a new AmberContext.
50    */
51   private AmberContext(AmberFactory factory)
52   {
53     _factory = factory;
54   }
55
56   /**
57    * Creates a new amber context.
58    */
59   public static AmberContext create(AmberFactory factory)
60   {
61     AmberContext context = _localContext.get();
62
63     if (context != null)
64       context._depth++;
65     else {
66       context = new AmberContext(factory);
67       _localContext.set(context);
68     }
69
70     return context;
71   }
72
73   /**
74    * Gets the current connection.
75    */
76   public static AmberConnection getConnection()
77     throws SQLException JavaDoc
78   {
79     AmberContext context = _localContext.get();
80
81     if (context == null)
82       throw new AmberException(L.l("No amber context is available."));
83
84     if (context._aConn == null)
85       context._aConn = context._factory.getConnection();
86
87     return context._aConn;
88   }
89
90   /**
91    * Closes the connection.
92    */
93   public static void close()
94   {
95     AmberContext context = _localContext.get();
96
97     if (context._depth == 0) {
98       _localContext.set(null);
99       
100       AmberConnection conn = context._aConn;
101       if (conn != null)
102     conn.close();
103     }
104     else
105       context._depth--;
106   }
107 }
108
Popular Tags