/*
* JBoss, Home of Professional Open Source.
* Copyright 2008, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.proxy.compiler;
import java.lang.reflect.Method;
import java.lang.reflect.Field;
import java.io.InputStream;
import java.net.URL;
import java.security.PrivilegedAction;
import java.security.AccessController;
/**
* Manages bytecode assembly for dynamic proxy generation.
* <p/>
* <p>This is the only data needed at runtime.
*
* @author Unknown
* @author <a href="mailto:jason@planet57.com">Jason Dillon</a>
* @version <tt>$Revision: 81030 $</tt>
*/
public class Runtime
extends ClassLoader
{
/**
* The field name of the runtime target proxies Runtime object.
*/
public final static String RUNTIME_FN = "runtime";
/**
* Construct a new <tt>Runtime</tt>
*
* @param parent The parent classloader to delegate to.
*/
public Runtime(ClassLoader parent)
{
super(parent);
}
// These members are common utilities used by ProxyTarget classes.
// They are all public so they can be linked to from generated code.
// I.e., they are the runtime support for the code compiled below.
Class targetTypes[];
Method methods[];
ProxyCompiler compiler;// temporary!
public Class[] copyTargetTypes()
{
return (Class[]) targetTypes.clone();
}
public Object invoke(InvocationHandler invocationHandler, int methodNum, Object values[])
throws Throwable
{
return invocationHandler.invoke(null, methods[methodNum], values);
}
void makeProxyType(ProxyCompiler compiler)
throws Exception
{
this.compiler = compiler; // temporary, for use during loading
byte code[] = compiler.getCode();
compiler.proxyType = super.defineClass(compiler.getProxyClassName(), code, 0, code.length);
super.resolveClass(compiler.proxyType);
// set the Foo$Impl.info pointer to myself
Field field = compiler.proxyType.getField(RUNTIME_FN);
field.set(null, this);
compiler = null;
}
ClassLoader getTargetClassLoader()
{
PrivilegedAction action = new PrivilegedAction()
{
public Object run()
{
return getParent();
}
};
return (ClassLoader) AccessController.doPrivileged(action);
}
public synchronized Class loadClass(String name, boolean resolve)
throws ClassNotFoundException
{
// isn't this redundant?
if (name.endsWith("$Proxy") && name.equals(compiler.getProxyClassName()))
{
return compiler.proxyType;
}
// delegate to the original class loader
ClassLoader cl = getTargetClassLoader();
if (cl == null)
{
return super.findSystemClass(name);
}
return cl.loadClass(name);
}
/**
* Delegate to the original class loader.
*/
public InputStream getResourceAsStream(String name)
{
ClassLoader cl = getTargetClassLoader();
if (cl == null)
{
return super.getSystemResourceAsStream(name);
}
return cl.getResourceAsStream(name);
}
/**
* Delegate to the original class loader.
*/
public URL getResource(String name)
{
ClassLoader cl = getTargetClassLoader();
if (cl == null)
{
return super.getSystemResource(name);
}
return cl.getResource(name);
}
}