Source Code Cross Referenced for Runtime.java in  » EJB-Server-JBoss-4.2.1 » server » org » jboss » proxy » compiler » 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.proxy.compiler 
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.proxy.compiler;
023:
024:        import java.lang.reflect.Method;
025:        import java.lang.reflect.Field;
026:
027:        import java.io.InputStream;
028:
029:        import java.net.URL;
030:        import java.security.PrivilegedAction;
031:        import java.security.AccessController;
032:
033:        /**
034:         * Manages bytecode assembly for dynamic proxy generation.
035:         * <p/>
036:         * <p>This is the only data needed at runtime.
037:         *
038:         * @author Unknown
039:         * @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
040:         * @version <tt>$Revision: 57209 $</tt>
041:         */
042:        public class Runtime extends ClassLoader {
043:            /**
044:             * The field name of the runtime target proxies Runtime object.
045:             */
046:            public final static String RUNTIME_FN = "runtime";
047:
048:            /**
049:             * Construct a new <tt>Runtime</tt>
050:             *
051:             * @param parent The parent classloader to delegate to.
052:             */
053:            public Runtime(ClassLoader parent) {
054:                super (parent);
055:            }
056:
057:            // These members are common utilities used by ProxyTarget classes.
058:            // They are all public so they can be linked to from generated code.
059:            // I.e., they are the runtime support for the code compiled below.
060:
061:            Class targetTypes[];
062:            Method methods[];
063:            ProxyCompiler compiler;// temporary!
064:
065:            public Class[] copyTargetTypes() {
066:                return (Class[]) targetTypes.clone();
067:            }
068:
069:            public Object invoke(InvocationHandler invocationHandler,
070:                    int methodNum, Object values[]) throws Throwable {
071:                return invocationHandler.invoke(null, methods[methodNum],
072:                        values);
073:            }
074:
075:            void makeProxyType(ProxyCompiler compiler) throws Exception {
076:                this .compiler = compiler; // temporary, for use during loading
077:                byte code[] = compiler.getCode();
078:
079:                compiler.proxyType = super .defineClass(compiler
080:                        .getProxyClassName(), code, 0, code.length);
081:                super .resolveClass(compiler.proxyType);
082:
083:                // set the Foo$Impl.info pointer to myself
084:                Field field = compiler.proxyType.getField(RUNTIME_FN);
085:                field.set(null, this );
086:
087:                compiler = null;
088:            }
089:
090:            ClassLoader getTargetClassLoader() {
091:                PrivilegedAction action = new PrivilegedAction() {
092:                    public Object run() {
093:                        return getParent();
094:                    }
095:                };
096:                return (ClassLoader) AccessController.doPrivileged(action);
097:            }
098:
099:            public synchronized Class loadClass(String name, boolean resolve)
100:                    throws ClassNotFoundException {
101:                // isn't this redundant?
102:                if (name.endsWith("$Proxy")
103:                        && name.equals(compiler.getProxyClassName())) {
104:                    return compiler.proxyType;
105:                }
106:
107:                // delegate to the original class loader
108:                ClassLoader cl = getTargetClassLoader();
109:                if (cl == null) {
110:                    return super .findSystemClass(name);
111:                }
112:
113:                return cl.loadClass(name);
114:            }
115:
116:            /**
117:             * Delegate to the original class loader.
118:             */
119:            public InputStream getResourceAsStream(String name) {
120:                ClassLoader cl = getTargetClassLoader();
121:
122:                if (cl == null) {
123:                    return super .getSystemResourceAsStream(name);
124:                }
125:
126:                return cl.getResourceAsStream(name);
127:            }
128:
129:            /**
130:             * Delegate to the original class loader.
131:             */
132:            public URL getResource(String name) {
133:                ClassLoader cl = getTargetClassLoader();
134:
135:                if (cl == null) {
136:                    return super.getSystemResource(name);
137:                }
138:
139:                return cl.getResource(name);
140:            }
141:        }
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