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Java > Open Source Codes > org > jboss > proxy > ejb > StatelessSessionInterceptor


1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software 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 GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.proxy.ejb;
23
24 import java.lang.reflect.Method JavaDoc;
25 import java.rmi.RemoteException JavaDoc;
26
27 import org.jboss.invocation.Invocation;
28 import org.jboss.invocation.InvocationContext;
29 import org.jboss.invocation.InvocationKey;
30 import org.jboss.invocation.InvocationType;
31 import org.jboss.proxy.ejb.handle.StatelessHandleImpl;
32
33
34 /**
35  * An EJB stateless session bean proxy class.
36  *
37  * @author <a HREF="mailto:marc.fleury@jboss.org">Marc Fleury</a>
38  * @version $Revision: 37459 $
39  */
40 public class StatelessSessionInterceptor
41    extends GenericEJBInterceptor
42 {
43    /** Serial Version Identifier. @since 1.4 */
44    private static final long serialVersionUID = -8807189798153718350L;
45
46    /**
47     * No-argument constructor for externalization.
48     */
49    public StatelessSessionInterceptor()
50    {}
51    
52    
53    // Public --------------------------------------------------------
54
55    /**
56     * InvocationHandler implementation.
57     *
58     * @throws Throwable Any exception or error thrown while processing.
59     */
60    public Object JavaDoc invoke(Invocation invocation)
61       throws Throwable JavaDoc
62    {
63       InvocationContext ctx = invocation.getInvocationContext();
64       Method JavaDoc m = invocation.getMethod();
65       
66       // Implement local methods
67 if (m.equals(TO_STRING))
68       {
69          return toString(ctx);
70       }
71       else if (m.equals(EQUALS))
72       {
73          Object JavaDoc[] args = invocation.getArguments();
74          String JavaDoc argsString = args[0] != null ? args[0].toString() : "";
75          String JavaDoc thisString = toString(ctx);
76          return new Boolean JavaDoc(thisString.equals(argsString));
77       }
78       else if (m.equals(HASH_CODE))
79       {
80          // We base the stateless hash on the hash of the proxy...
81 // MF XXX: it could be that we want to return the hash of the name?
82 return new Integer JavaDoc(this.hashCode());
83       }
84       // Implement local EJB calls
85 else if (m.equals(GET_HANDLE))
86       {
87          return new StatelessHandleImpl(
88                (String JavaDoc)ctx.getValue(InvocationKey.JNDI_NAME));
89       }
90       else if (m.equals(GET_PRIMARY_KEY))
91       {
92          throw new RemoteException JavaDoc("Call to getPrimaryKey not allowed on session bean");
93       }
94       else if (m.equals(GET_EJB_HOME))
95       {
96          return getEJBHome(invocation);
97       }
98       else if (m.equals(IS_IDENTICAL))
99       {
100          // All stateless beans are identical within a home,
101 // if the names are equal we are equal
102 Object JavaDoc[] args = invocation.getArguments();
103          String JavaDoc argsString = args[0].toString();
104          String JavaDoc thisString = toString(ctx);
105          return new Boolean JavaDoc(thisString.equals(argsString));
106       }
107       // If not taken care of, go on and call the container
108 else
109       {
110          invocation.setType(InvocationType.REMOTE);
111          
112          return getNext().invoke(invocation);
113       }
114    }
115    
116    // Package protected ---------------------------------------------
117
118    // Protected -----------------------------------------------------
119
120    // Private -------------------------------------------------------
121 private String JavaDoc toString(InvocationContext ctx)
122    {
123       return ctx.getValue(InvocationKey.JNDI_NAME) + ":Stateless";
124    }
125 }
126
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