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Java > Open Source Codes > org > openejb > client > StatelessEJBHomeHandler


1 /**
2  * Redistribution and use of this software and associated documentation
3  * ("Software"), with or without modification, are permitted provided
4  * that the following conditions are met:
5  *
6  * 1. Redistributions of source code must retain copyright
7  * statements and notices. Redistributions must also contain a
8  * copy of this document.
9  *
10  * 2. Redistributions in binary form must reproduce the
11  * above copyright notice, this list of conditions and the
12  * following disclaimer in the documentation and/or other
13  * materials provided with the distribution.
14  *
15  * 3. The name "OpenEJB" must not be used to endorse or promote
16  * products derived from this Software without prior written
17  * permission of The OpenEJB Group. For written permission,
18  * please contact dev@openejb.org.
19  *
20  * 4. Products derived from this Software may not be called "OpenEJB"
21  * nor may "OpenEJB" appear in their names without prior written
22  * permission of The OpenEJB Group. OpenEJB is a registered
23  * trademark of The OpenEJB Group.
24  *
25  * 5. Due credit should be given to the OpenEJB Project
26  * (http://www.openejb.org/).
27  *
28  * THIS SOFTWARE IS PROVIDED BY THE OPENEJB GROUP AND CONTRIBUTORS
29  * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32  * THE OPENEJB GROUP OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39  * OF THE POSSIBILITY OF SUCH DAMAGE.
40  *
41  * Copyright 2001 (C) The OpenEJB Group. All Rights Reserved.
42  *
43  * $Id: StatelessEJBHomeHandler.java 1912 2005-06-16 22:29:56Z jlaskowski $
44  */
45 package org.openejb.client;
46
47 import java.lang.reflect.Method JavaDoc;
48 import java.rmi.RemoteException JavaDoc;
49
50 /**
51  * This InvocationHandler and its proxy are serializable and can be used by
52  * HomeHandle, Handle, and MetaData to persist and revive handles. It maintains
53  * its original client identity which allows the container to be more discerning about
54  * allowing the revieed proxy to be used. See StatefulContaer manager for more details.
55  *
56  * @author <a HREF="mailto:david.blevins@visi.com">David Blevins</a>
57  * @author <a HREF="mailto:Richard@Monson-Haefel.com">Richard Monson-Haefel</a>
58  */
59 public class StatelessEJBHomeHandler extends EJBHomeHandler {
60     
61     public StatelessEJBHomeHandler(){
62     }
63     
64     public StatelessEJBHomeHandler(EJBMetaDataImpl ejb, ServerMetaData server, ClientMetaData client){
65         super(ejb, server, client);
66     }
67     
68     /**
69      *
70      * EJB 1.1 Specification, Section 5.5 Session object identity
71      * Since all session objects hide their identity, there is no need to provide a finder for them. The home
72      * interface of a session bean must not define any finder methods.
73      *
74      * @param method
75      * @param args
76      * @param proxy
77      * @return Returns an new EJBObject proxy and handler
78      * @exception Throwable
79      */
80     protected Object JavaDoc findX(Method JavaDoc method, Object JavaDoc[] args, Object JavaDoc proxy) throws Throwable JavaDoc {
81         throw new UnsupportedOperationException JavaDoc("Stateful beans may not have find methods");
82     }
83     
84     /**
85      * ------------------------------------
86      * 5.3.2 Removing a session object
87      * A client may remove a session object using the remove() method on the javax.ejb.EJBObject
88      * interface, or the remove(Handle handle) method of the javax.ejb.EJBHome interface.
89      *
90      * Because session objects do not have primary keys that are accessible to clients, invoking the
91      * javax.ejb.EJBHome.remove(Object primaryKey) method on a session results in the
92      * javax.ejb.RemoveException.
93      *
94      * ------------------------------------
95      * 5.5 Session object identity
96      *
97      * Session objects are intended to be private resources used only by the
98      * client that created them. For this reason, session objects, from the
99      * client’s perspective, appear anonymous. In contrast to entity objects,
100      * which expose their identity as a primary key, session objects hide their
101      * identity. As a result, the EJBObject.getPrimaryKey() and
102      * EJBHome.remove(Object primaryKey) methods result in a java.rmi.RemoteException
103      * if called on a session bean. If the EJBMetaData.getPrimaryKeyClass()
104      * method is invoked on a EJBMetaData object for a Session bean, the method throws
105      * the java.lang.RuntimeException.
106      * ------------------------------------
107      *
108      * Sections 5.3.2 and 5.5 conflict. 5.3.2 says to throw javax.ejb.RemoveException, 5.5 says to
109      * throw java.rmi.RemoteException.
110      *
111      * For now, we are going with java.rmi.RemoteException.
112      */
113     protected Object JavaDoc removeByPrimaryKey(Method JavaDoc method, Object JavaDoc[] args, Object JavaDoc proxy) throws Throwable JavaDoc {
114         throw new RemoteException JavaDoc("Session objects are private resources and do not have primary keys");
115     }
116     
117     
118     /*
119     * TODO:3: Get a related quote from the specification to add here
120     *
121     * This method is differnt the the stateful and entity behavior because we only want the
122     * stateless session bean that created the proxy to be invalidated, not all the proxies. Special case
123     * for the stateless session beans.
124     */
125     protected Object JavaDoc removeWithHandle(Method JavaDoc method, Object JavaDoc[] args, Object JavaDoc proxy) throws Throwable JavaDoc{
126         // Extract the primary key from the handle
127 EJBObjectHandle handle = (EJBObjectHandle)args[0];
128         
129         // TODO:1: Check that this is exactly spec compliant
130 if ( handle == null ) throw new NullPointerException JavaDoc("The handle is null");
131
132         EJBObjectHandler handler = (EJBObjectHandler)handle.ejbObjectProxy.getEJBObjectHandler();
133         
134         // TODO:1: Check that this is exactly spec compliant
135 if ( !handler.ejb.deploymentID.equals(this.ejb.deploymentID) ){
136             throw new IllegalArgumentException JavaDoc("The handle is not from the same deployment");
137         }
138         handler.invalidateReference();
139
140         return null;
141     }
142
143     protected EJBObjectHandler newEJBObjectHandler() {
144         return new StatelessEJBObjectHandler();
145     }
146     
147 }
148
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