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Java > Open Source Codes > com > caucho > ejb > gen > StatelessBean


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  *
23  * Free Software Foundation, Inc.
24  * 59 Temple Place, Suite 330
25  * Boston, MA 02111-1307 USA
26  *
27  * @author Scott Ferguson
28  */

29
30 package com.caucho.ejb.gen;
31
32 import com.caucho.bytecode.JClass;
33 import com.caucho.java.JavaWriter;
34 import com.caucho.util.L10N;
35
36 import java.io.IOException JavaDoc;
37
38 /**
39  * Generates the skeleton for a session bean.
40  */

41 public class StatelessBean extends SessionBean {
42   private static final L10N L = new L10N(StatelessBean.class);
43   
44   public StatelessBean(JClass ejbClass, String JavaDoc contextClassName)
45   {
46     super(ejbClass, contextClassName);
47   }
48
49   protected void generateContext(JavaWriter out)
50     throws IOException JavaDoc
51   {
52     String JavaDoc shortContextName = _contextClassName;
53     int p = shortContextName.lastIndexOf('.');
54
55     if (p > 0)
56       shortContextName = shortContextName.substring(p + 1);
57
58     int freeStackMax = 16;
59     
60     out.println("protected static final java.util.logging.Logger __caucho_log = com.caucho.log.Log.open(" + _contextClassName + ".class);");
61     out.println();
62     out.println("com.caucho.ejb.xa.EjbTransactionManager _xaManager;");
63     
64     out.println("private Bean []_freeBeanStack = new Bean[" + freeStackMax + "];");
65     out.println("private int _freeBeanTop;");
66     out.println();
67     out.println("public " + shortContextName + "(com.caucho.ejb.session.StatelessServer server)");
68     out.println("{");
69     out.println(" super(server);");
70     out.println(" _xaManager = server.getContainer().getTransactionManager();");
71     out.println("}");
72     
73     out.println();
74     out.println("Bean _ejb_begin(com.caucho.ejb.xa.TransactionContext trans)");
75     out.println(" throws javax.ejb.EJBException");
76     out.println("{");
77     out.pushDepth();
78     out.println("Bean bean;");
79     out.println("synchronized (this) {");
80     out.println(" if (_freeBeanTop > 0) {");
81     out.println(" bean = _freeBeanStack[--_freeBeanTop];");
82     out.println(" return bean;");
83     out.println(" }");
84     out.println("}");
85     out.println();
86     out.println("try {");
87     out.println(" bean = new Bean(this);");
88     
89     if (hasMethod("ejbCreate", new JClass[0])) {
90       out.println(" bean.ejbCreate();");
91     }
92       
93     out.println(" return bean;");
94     out.println("} catch (Exception e) {");
95     out.println(" throw com.caucho.ejb.EJBExceptionWrapper.create(e);");
96     out.println("}");
97     out.popDepth();
98     out.println("}");
99     
100     out.println();
101     out.println("void _ejb_free(Bean bean)");
102     out.println(" throws javax.ejb.EJBException");
103     out.println("{");
104     out.pushDepth();
105     out.println("if (bean == null)");
106     out.println(" return;");
107     out.println();
108     out.println("synchronized (this) {");
109     out.println(" if (_freeBeanTop < _freeBeanStack.length) {");
110     out.println(" _freeBeanStack[_freeBeanTop++] = bean;");
111     out.println(" return;");
112     out.println(" }");
113     out.println("}");
114     
115     if (hasMethod("ejbRemove", new JClass[0])) {
116       out.println();
117       out.println("bean.ejbRemove();");
118     }
119     
120     out.popDepth();
121     out.println("}");
122     
123     out.println();
124     out.println("public void destroy()");
125     out.println("{");
126     out.pushDepth();
127     out.println("Bean ptr;");
128     out.println("Bean []freeBeanStack;");
129     out.println("int freeBeanTop;");
130     
131     out.println("synchronized (this) {");
132     out.println(" freeBeanStack = _freeBeanStack;");
133     out.println(" freeBeanTop = _freeBeanTop;");
134     out.println(" _freeBeanStack = null;");
135     out.println(" _freeBeanTop = 0;");
136     out.println("}");
137     
138     if (hasMethod("ejbRemove", new JClass[0])) {
139       out.println();
140       out.println("for (int i = 0; i < freeBeanTop; i++) {");
141       out.pushDepth();
142       
143       out.println("try {");
144       out.println(" if (freeBeanStack[i] != null)");
145       out.println(" freeBeanStack[i].ejbRemove();");
146       out.println("} catch (Throwable e) {");
147       out.println(" __caucho_log.log(java.util.logging.Level.FINE, e.toString(), e);");
148       out.println("}");
149
150       out.popDepth();
151       out.println("}");
152     }
153     out.popDepth();
154     out.println("}");
155   }
156
157   protected void generateNewInstance(JavaWriter out)
158     throws IOException JavaDoc
159   {
160   }
161 }
162
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