Source Code Cross Referenced for WrappedRemote.java in  » 6.0-JDK-Modules » j2me » com » sun » xlet » ixc » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.xlet.ixc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)WrappedRemote.java	1.14 05/03/12
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation. 
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt). 
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA 
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions. 
025:         *
026:         */
027:
028:        package com.sun.xlet.ixc;
029:
030:        import java.rmi.Remote;
031:        import java.rmi.RemoteException;
032:        import java.rmi.UnexpectedException;
033:        import java.lang.reflect.Method;
034:        import java.lang.reflect.InvocationTargetException;
035:        import javax.microedition.xlet.XletContext;
036:        import java.security.AccessController;
037:        import java.security.AccessControlContext;
038:        import java.security.PrivilegedActionException;
039:        import java.security.PrivilegedExceptionAction;
040:
041:        /**
042:         * A remote object that has been wrapped to be safely accessible from
043:         * a client.  In other words, an instance of WrappedRemote is a stub
044:         * object that delegates its calls to the true remote object.  The remote
045:         * calls are executed in a thread that is in the remote ResourceDomain.
046:         * This can be done by transferring the call to a worker thread on the
047:         * remote side, or by changing the owner attribute of the thread.
048:         */
049:
050:        public abstract class WrappedRemote implements  Remote {
051:            private Remote target;
052:            private ImportRegistry registry;
053:            private RegistryKey key;
054:            private static Method hashCodeMethod;
055:            private static Method equalsMethod;
056:            private static Method toStringMethod;
057:            static {
058:                try {
059:                    Class obj = Object.class;
060:                    hashCodeMethod = obj.getMethod("hashCode", new Class[0]);
061:                    equalsMethod = obj.getMethod("equals", new Class[] { obj });
062:                    toStringMethod = obj.getMethod("toString", new Class[0]);
063:                } catch (Exception ex) {
064:                    // assert(false);
065:                    ex.printStackTrace();
066:                }
067:            }
068:
069:            protected WrappedRemote(Remote target, ImportRegistry registry,
070:                    RegistryKey key) {
071:                this .target = target;
072:                this .registry = registry;
073:                this .key = key;
074:            }
075:
076:            protected void finalize() {
077:                registry.unregisterStub(key);
078:            }
079:
080:            //
081:            // Execute a remote method.  Note that this Method object must refer
082:            // to the method loaded by the target classloader (and not the
083:            // classloader of the stub class).
084:            //
085:            protected final Object com_sun_xlet_execute(
086:                    final Method remoteMethod, final Object[] args)
087:                    throws java.lang.Exception {
088:                //XletContextImpl localXlet = registry.importer;
089:                //XletContextImpl remoteXlet = registry.target;
090:                XletContext localXlet = registry.importer;
091:                XletContext remoteXlet = registry.target;
092:                if (remoteXlet == null) {
093:                    throw new RemoteException("Remote target killed");
094:                }
095:                IxcRegistryImpl ixcRegis = IxcRegistryImpl
096:                        .getIxcRegistryImpl(remoteXlet);
097:                ImportRegistry remoteIR = (ImportRegistry) ixcRegis
098:                        .getImportRegistry(localXlet);
099:                final AccessControlContext context = ixcRegis.acc;
100:
101:                // Now wrap or copy arguments...
102:                for (int i = 0; i < args.length; i++) {
103:                    args[i] = remoteIR.wrapOrCopy(args[i]);
104:                }
105:                final Object[] result = new Object[2];
106:                final Remote targetNow = target;
107:                if (targetNow == null) {
108:                    // This should never happen, but be conservative
109:                    throw new RemoteException("Remote target killed");
110:                }
111:                if (remoteMethod == null) {
112:                    // Stub has been destroyed in this case, must be reexported object 
113:                    throw new RemoteException("Remote target killed");
114:                }
115:                ixcRegis.executeForClient(new Runnable() {
116:                    public void run() {
117:                        try {
118:                            AccessController.doPrivileged(
119:                                    new PrivilegedExceptionAction() {
120:                                        public Object run()
121:                                                throws RemoteException {
122:                                            Throwable err = null;
123:                                            try {
124:                                                result[0] = remoteMethod
125:                                                        .invoke(targetNow, args);
126:                                            } catch (InvocationTargetException ite) {
127:                                                err = ite.getTargetException();
128:                                            } catch (Throwable t) {
129:                                                err = t;
130:                                            }
131:                                            if (err == null) {
132:                                                try {
133:                                                    result[0] = registry
134:                                                            .wrapOrCopy(result[0]);
135:                                                } catch (RemoteException ex) {
136:                                                    result[1] = ex;
137:                                                }
138:                                            } else {
139:                                                try {
140:                                                    result[1] = registry
141:                                                            .wrapOrCopy(err);
142:                                                } catch (RemoteException ex) {
143:                                                    result[1] = ex;
144:                                                }
145:                                            }
146:                                            return null;
147:                                        }
148:                                    }, context);
149:                        } catch (PrivilegedActionException pae) {
150:                            // assert(false)
151:                            pae.getCause().printStackTrace();
152:                        }
153:                    }
154:                });
155:                if (result[1] != null) {
156:                    // fix for 4653779, if the exception is checked, throw it
157:                    // directly, else wrap it in UnsupportedException
158:                    Class[] exceptions = remoteMethod.getExceptionTypes();
159:                    for (int i = 0; i < exceptions.length; i++) {
160:                        if (exceptions[i].isInstance(result[1])) {
161:                            throw (Exception) result[1];
162:                        }
163:                    }
164:                    // fix for 4641529, just throw if it's a RuntimeException,
165:                    // else wrap it in RemoteException
166:
167:                    if (result[1] instanceof  RuntimeException) {
168:                        throw (RuntimeException) result[1];
169:                    } else if (result[1] instanceof  RemoteException) {
170:                        throw (RemoteException) result[1];
171:                    } else {
172:                        throw new UnexpectedException("Non-declared exception",
173:                                (Exception) result[1]);
174:                    }
175:                }
176:                return registry.wrapOrCopy(result[0]);
177:            }
178:
179:            void destroy() {
180:                target = null;
181:            }
182:
183:            Remote getTarget() {
184:                return target;
185:            }
186:
187:            public int hashCode() {
188:                try {
189:                    Object result = com_sun_xlet_execute(hashCodeMethod,
190:                            new Object[0]);
191:                    return ((Integer) result).intValue();
192:                    //} catch (RemoteException ex) {
193:                } catch (Exception ex) {
194:                    // Client has died.  This is the same behavior that
195:                    // java.rmi.server.RemoteObject gives.
196:                    return super .hashCode();
197:                }
198:            }
199:
200:            public boolean equals(Object obj) {
201:                if (this  == obj) {
202:                    return true;
203:                } else if (!(obj instanceof  WrappedRemote)) {
204:                    if (obj == null) {
205:                        return false;
206:                    } else {
207:                        return obj.equals(this );
208:                        // cf. bug 4099660, and java.rmi.server.RemoteObject.equals().
209:                    }
210:                }
211:                try {
212:                    Object result
213:                    //= com_sun_tvimpl_execute(equalsMethod, new Object[] { obj });
214:                    = com_sun_xlet_execute(equalsMethod, new Object[] { obj });
215:                    return ((Boolean) result).booleanValue();
216:                } catch (Exception ex) {
217:                    // Client has died, or o is an incompatible type.
218:                    return false;
219:                }
220:            }
221:
222:            public String toString() {
223:                try {
224:                    String classname = this .getClass().getName();
225:                    Object result
226:                    //= com_sun_tvimpl_execute(toStringMethod, new Object[0]);
227:                    = com_sun_xlet_execute(toStringMethod, new Object[0]);
228:                    return classname + "[" + result + "]";
229:                    //} catch (RemoteException ex) {
230:                } catch (Exception ex) {
231:                    return super.toString();
232:                }
233:            }
234:        }
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