Source Code Cross Referenced for SessionObjectInputStream.java in  » EJB-Server-JBoss-4.2.1 » server » org » jboss » ejb » plugins » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » server » org.jboss.ejb.plugins 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.ejb.plugins;
023:
024:        import java.io.InputStream;
025:        import java.io.ObjectInputStream;
026:        import java.io.ObjectStreamClass;
027:        import java.io.IOException;
028:        import java.lang.reflect.Proxy;
029:        import java.security.PrivilegedAction;
030:        import java.security.AccessController;
031:
032:        import javax.ejb.Handle;
033:        import javax.ejb.HomeHandle;
034:
035:        import org.jboss.ejb.StatefulSessionEnterpriseContext;
036:
037:        /**
038:         * The SessionObjectInputStream is used to deserialize stateful session beans when they are activated
039:         *      
040:         * @see org.jboss.ejb.plugins.SessionObjectOutputStream
041:         * @author <a href="mailto:rickard.oberg@telkel.com">Rickard berg</a>
042:         * @author <a href="mailto:sebastien.alborini@m4x.org">Sebastien Alborini</a>
043:         * @author <a href="mailto:scott.stark@jboss.org">Scott Stark</a>
044:         * @version $Revision: 57209 $
045:         */
046:        public class SessionObjectInputStream extends ObjectInputStream {
047:            private StatefulSessionEnterpriseContext ctx;
048:            private ClassLoader appCl;
049:
050:            // Constructors -------------------------------------------------
051:            public SessionObjectInputStream(
052:                    StatefulSessionEnterpriseContext ctx, InputStream in)
053:                    throws IOException {
054:                super (in);
055:                EnableResolveObjectAction.enableResolveObject(this );
056:
057:                this .ctx = ctx;
058:
059:                // cache the application classloader
060:                appCl = SecurityActions.getContextClassLoader();
061:            }
062:
063:            // ObjectInputStream overrides -----------------------------------
064:            protected Object resolveObject(Object obj) throws IOException {
065:                Object resolved = obj;
066:
067:                // section 6.4.1 of the ejb1.1 specification states what must be taken care of 
068:
069:                // ejb reference (remote interface) : resolve handle to EJB
070:                if (obj instanceof  Handle)
071:                    resolved = ((Handle) obj).getEJBObject();
072:
073:                // ejb reference (home interface) : resolve handle to EJB Home
074:                else if (obj instanceof  HomeHandle)
075:                    resolved = ((HomeHandle) obj).getEJBHome();
076:
077:                // naming context: the jnp implementation of contexts is serializable, do nothing
078:
079:                else if (obj instanceof  HandleWrapper) {
080:                    HandleWrapper wrapper = (HandleWrapper) obj;
081:                    try {
082:                        resolved = wrapper.get();
083:                    } catch (ClassNotFoundException e) {
084:                        throw new IOException("Failed to find class: "
085:                                + e.getMessage());
086:                    }
087:                }
088:
089:                else if (obj instanceof  StatefulSessionBeanField) {
090:                    byte type = ((StatefulSessionBeanField) obj).type;
091:
092:                    // session context: recreate it
093:                    if (type == StatefulSessionBeanField.SESSION_CONTEXT)
094:                        resolved = ctx.getSessionContext();
095:
096:                    // user transaction: restore it
097:                    else if (type == StatefulSessionBeanField.USER_TRANSACTION)
098:                        resolved = ctx.getSessionContext().getUserTransaction();
099:                }
100:                return resolved;
101:            }
102:
103:            /** Override the ObjectInputStream implementation to use the application class loader
104:             */
105:            protected Class resolveClass(ObjectStreamClass v)
106:                    throws IOException, ClassNotFoundException {
107:                try {
108:                    // use the application classloader to resolve the class
109:                    return appCl.loadClass(v.getName());
110:
111:                } catch (ClassNotFoundException e) {
112:                    // we should probably never get here
113:                    return super .resolveClass(v);
114:                }
115:            }
116:
117:            /** Override the ObjectInputStream implementation to use the application class loader
118:             */
119:            protected Class resolveProxyClass(String[] interfaces)
120:                    throws IOException, ClassNotFoundException {
121:                Class clazz = null;
122:                Class[] ifaceClasses = new Class[interfaces.length];
123:                for (int i = 0; i < interfaces.length; i++)
124:                    ifaceClasses[i] = Class
125:                            .forName(interfaces[i], false, appCl);
126:                try {
127:                    clazz = Proxy.getProxyClass(appCl, ifaceClasses);
128:                } catch (IllegalArgumentException e) {
129:                    throw new ClassNotFoundException(
130:                            "Failed to resolve proxy class", e);
131:                }
132:                return clazz;
133:            }
134:
135:            private static class EnableResolveObjectAction implements 
136:                    PrivilegedAction {
137:                SessionObjectInputStream is;
138:
139:                EnableResolveObjectAction(SessionObjectInputStream is) {
140:                    this .is = is;
141:                }
142:
143:                public Object run() {
144:                    is.enableResolveObject(true);
145:                    return null;
146:                }
147:
148:                static void enableResolveObject(SessionObjectInputStream is) {
149:                    EnableResolveObjectAction action = new EnableResolveObjectAction(
150:                            is);
151:                    AccessController.doPrivileged(action);
152:                }
153:            }
154:        }
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