Source Code Cross Referenced for ImportedObject.java in  » 6.0-JDK-Modules » j2me » com » sun » jumpimpl » 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.jumpimpl.ixc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)ImportedObject.java	1.5 06/09/06
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:        package com.sun.jumpimpl.ixc;
028:
029:        import java.lang.reflect.Method;
030:        import java.lang.reflect.Constructor;
031:        import java.rmi.Remote;
032:        import java.rmi.RemoteException;
033:        import java.security.AccessController;
034:        import java.security.PrivilegedAction;
035:        import java.util.Arrays;
036:        import java.util.Collection;
037:        import java.util.HashMap;
038:        import java.util.List;
039:        import javax.microedition.xlet.XletContext;
040:        import javax.microedition.xlet.ixc.*;
041:
042:        /*
043:         * An record of an imported Remote objects for this client VM.
044:         */
045:
046:        public class ImportedObject {
047:
048:            static HashMap importedObjects = new HashMap(); // <XletContext, HashMap of RemoteRef, ImportedObj>
049:            static HashMap typeByName = new HashMap(); // <Array of interface Names, stub>
050:
051:            private StubObject stub;
052:
053:            /**
054:             * If the list of interface names in the RemoteRef parameter
055:             * is something that we've seen in the past, then simply instanciate
056:             * the stub class that we generated earlier.  Else, generate the stub 
057:             * and save it for the future use. 
058:             * TODO: In the future, may need to identify stub based on XletContext
059:             * as well (necessary when we have multiple xlets in a single VM).
060:             **/
061:            private ImportedObject(RemoteRef ref, XletContext context)
062:                    throws StubException {
063:
064:                List interfaceNames = Arrays.asList(ref.interfaceNames);
065:                Class stubClass;
066:
067:                synchronized (typeByName) {
068:
069:                    stubClass = (Class) typeByName.get(interfaceNames);
070:
071:                    if (stubClass == null) {
072:                        ClassLoader xletLoader = context.getClassLoader();
073:
074:                        if (xletLoader == null)
075:                            throw new StubException(
076:                                    "XletContext.getClassLoader() returns null");
077:
078:                        RemoteObjectType roType;
079:                        try {
080:                            roType = new RemoteObjectType(ref.interfaceNames,
081:                                    xletLoader);
082:                        } catch (RemoteException re) {
083:                            if (re instanceof  StubException)
084:                                throw (StubException) re;
085:                            else
086:                                throw new StubException(
087:                                        "Can't find needed interfaces for stub generation",
088:                                        re.getCause());
089:                        }
090:
091:                        checkForTheMethodsMatch(ref.methodIDs,
092:                                roType.methodsByID.keySet());
093:                        StubClassGenerator generator = new StubClassGenerator(
094:                                xletLoader);
095:                        stubClass = generator.generate(roType);
096:
097:                        typeByName.put(interfaceNames, stubClass);
098:                    }
099:                }
100:
101:                // Stub class to be instanciated.
102:                final Class stubClassF = stubClass;
103:
104:                //System.out.println("@@ Got remote class " + stubClass);
105:                final Class[] types = { Object.class, Object.class };
106:                final Object[] args = { ref, context };
107:
108:                // Instanciate a stub.
109:                Object returnValue = AccessController
110:                        .doPrivileged(new PrivilegedAction() {
111:                            public Object run() {
112:
113:                                Object obj;
114:                                try {
115:                                    Constructor m = stubClassF
116:                                            .getConstructor(types);
117:                                    obj = m.newInstance(args);
118:                                } catch (Exception ex) {
119:                                    obj = new StubException(
120:                                            "Cannot create stub object", ex);
121:                                }
122:
123:                                return obj;
124:                            }
125:                        });
126:
127:                if (returnValue instanceof  StubException) {
128:                    throw (StubException) returnValue;
129:                }
130:
131:                stub = (StubObject) returnValue;
132:                //System.out.println("@@ Created object " + stub);
133:            }
134:
135:            // Return a stub object for the RemoteRef.
136:            // If the RemoteRef object has been registered in the past,
137:            // then just return the ImportedObject for it.
138:            public static Remote registerImportedObject(RemoteRef ref,
139:                    XletContext context) throws StubException {
140:
141:                ImportedObject importedObject = null;
142:
143:                synchronized (importedObjects) {
144:                    //importedObject = (ImportedObject) importedObjects.get(ref);
145:                    HashMap map = (HashMap) importedObjects.get(context);
146:                    if (map == null) {
147:                        map = new HashMap();
148:                        importedObjects.put(context, map);
149:                    } else {
150:                        importedObject = (ImportedObject) map.get(ref);
151:                    }
152:
153:                    if (importedObject == null) {
154:                        importedObject = new ImportedObject(ref, context);
155:                        map.put(ref, importedObject);
156:                    }
157:                }
158:
159:                return (Remote) importedObject.stub;
160:            }
161:
162:            private void checkForTheMethodsMatch(long[] originalIDs,
163:                    Collection otherIDs) throws StubException {
164:
165:                // Checks whether the array of method hash passed in as a RemoteRef
166:                // contains exactly the same set of long values that this importer
167:                // computed based on the set of Remote Methods found in this classloader
168:                // context.
169:
170:                if (originalIDs.length != otherIDs.size())
171:                    throw new StubException("Mismatching Remote Interface");
172:
173:                for (int i = 0; i < originalIDs.length; i++) {
174:                    if (!otherIDs.contains(new Long(originalIDs[i])))
175:                        throw new StubException("Mismatching Remote Interface");
176:                }
177:            }
178:        }
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