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Java > Open Source Codes > org > openejb > core > stateless > StatelessEjbHomeHandler


1 /**
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3  * ("Software"), with or without modification, are permitted provided
4  * that the following conditions are met:
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8  * copy of this document.
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10  * 2. Redistributions in binary form must reproduce the
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12  * following disclaimer in the documentation and/or other
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16  * products derived from this Software without prior written
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18  * please contact info@exolab.org.
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20  * 4. Products derived from this Software may not be called "Exolab"
21  * nor may "Exolab" appear in their names without prior written
22  * permission of Exoffice Technologies. Exolab is a registered
23  * trademark of Exoffice Technologies.
24  *
25  * 5. Due credit should be given to the Exolab Project
26  * (http://www.exolab.org/).
27  *
28  * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES 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  * EXOFFICE TECHNOLOGIES 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)
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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 1999 (C) Exoffice Technologies Inc. All Rights Reserved.
42  *
43  * $Id: StatelessEjbHomeHandler.java 1096 2004-03-26 21:41:16Z dblevins $
44  */
45 package org.openejb.core.stateless;
46
47 import java.lang.reflect.Method JavaDoc;
48 import java.rmi.RemoteException JavaDoc;
49
50 import org.openejb.RpcContainer;
51 import org.openejb.core.ThreadContext;
52 import org.openejb.core.ivm.EjbHomeProxyHandler;
53 import org.openejb.core.ivm.EjbObjectProxyHandler;
54 import org.openejb.core.ivm.IntraVmHandle;
55 import org.openejb.util.proxy.ProxyManager;
56
57 /**
58  * This InvocationHandler and its proxy are serializable and can be used by
59  * HomeHandle, Handle, and MetaData to persist and revive handles. It maintains
60  * its original client identity which allows the container to be more discerning about
61  * allowing the revieed proxy to be used. See StatefulContaer manager for more details.
62  *
63  * @author <a HREF="mailto:david.blevins@visi.com">David Blevins</a>
64  * @author <a HREF="mailto:Richard@Monson-Haefel.com">Richard Monson-Haefel</a>
65  */
66 public class StatelessEjbHomeHandler extends EjbHomeProxyHandler {
67     
68     public StatelessEjbHomeHandler(RpcContainer container, Object JavaDoc pk, Object JavaDoc depID){
69         super(container, pk, depID);
70     }
71     
72     /**
73      *
74      * EJB 1.1 Specification, Section 5.5 Session object identity
75      * Since all session objects hide their identity, there is no need to provide a finder for them. The home
76      * interface of a session bean must not define any finder methods.
77      *
78      * @param method
79      * @param args
80      * @param proxy
81      * @return Returns an new EJBObject proxy and handler
82      * @exception Throwable
83      */
84     protected Object JavaDoc findX(Method JavaDoc method, Object JavaDoc[] args, Object JavaDoc proxy) throws Throwable JavaDoc {
85         throw new UnsupportedOperationException JavaDoc("Stateful beans may not have find methods");
86     }
87     
88     /**
89      * ------------------------------------
90      * 5.3.2 Removing a session object
91      * A client may remove a session object using the remove() method on the javax.ejb.EJBObject
92      * interface, or the remove(Handle handle) method of the javax.ejb.EJBHome interface.
93      *
94      * Because session objects do not have primary keys that are accessible to clients, invoking the
95      * javax.ejb.EJBHome.remove(Object primaryKey) method on a session results in the
96      * javax.ejb.RemoveException.
97      *
98      * ------------------------------------
99      * 5.5 Session object identity
100      *
101      * Session objects are intended to be private resources used only by the
102      * client that created them. For this reason, session objects, from the
103      * client’s perspective, appear anonymous. In contrast to entity objects,
104      * which expose their identity as a primary key, session objects hide their
105      * identity. As a result, the EJBObject.getPrimaryKey() and
106      * EJBHome.remove(Object primaryKey) methods result in a java.rmi.RemoteException
107      * if called on a session bean. If the EJBMetaData.getPrimaryKeyClass()
108      * method is invoked on a EJBMetaData object for a Session bean, the method throws
109      * the java.lang.RuntimeException.
110      * ------------------------------------
111      *
112      * Sections 5.3.2 and 5.5 conflict. 5.3.2 says to throw javax.ejb.RemoveException, 5.5 says to
113      * throw java.rmi.RemoteException.
114      *
115      * For now, we are going with java.rmi.RemoteException.
116      */
117     protected Object JavaDoc removeByPrimaryKey(Method JavaDoc method, Object JavaDoc[] args, Object JavaDoc proxy) throws Throwable JavaDoc {
118         throw new RemoteException JavaDoc("Session objects are private resources and do not have primary keys");
119     }
120     /*
121     * This method is different from 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.
123     *
124     * TODO: this method relies on the fact that the handle implementation is a subclass
125     * of IntraVM handle, which isn't neccessarily the case for arbitrary remote protocols.
126     */
127     protected Object JavaDoc removeWithHandle(Method JavaDoc method, Object JavaDoc[] args, Object JavaDoc proxy) throws Throwable JavaDoc{
128
129         // Extract the primary key from the handle
130 IntraVmHandle handle = (IntraVmHandle)args[0];
131         Object JavaDoc primKey = handle.getPrimaryKey();
132         EjbObjectProxyHandler stub;
133         try{
134             stub = (EjbObjectProxyHandler)ProxyManager.getInvocationHandler(handle.getEJBObject());
135         }catch(IllegalArgumentException JavaDoc e) {
136             // a remote proxy
137 stub=null;
138         }
139         // invoke the remove on the container
140 container.invoke(deploymentID, method, args, primKey, ThreadContext.getThreadContext().getSecurityIdentity());
141         if(stub!=null) {
142         stub.invalidateReference();
143         }
144         return null;
145     }
146     
147     protected EjbObjectProxyHandler newEjbObjectHandler(RpcContainer container, Object JavaDoc pk, Object JavaDoc depID) {
148         return new StatelessEjbObjectHandler(container, pk, depID);
149     }
150     
151 }
152
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