jdk12interceptor.java

低版本的tomcat 对于有些老版本的应用还真的需要老版的中间件

/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
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 * <http://www.apache.org/>.
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 * [Additional notices, if required by prior licensing conditions]
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package org.apache.tomcat.request;

import org.apache.tomcat.core.*;
import org.apache.tomcat.util.*;
import java.io.*;
import java.net.*;
import java.util.*;

/**
 *  JDK1.2 specific options. Fix the class loader, etc.
 */
public final class Jdk12Interceptor extends  BaseInterceptor {
    private ContextManager cm;
    private int debug=0;
    private boolean useThreadLoader=false;

    public Jdk12Interceptor() {
    }

    public void setContextManager( ContextManager cm ) {
	this.cm=cm;
    }

    public void setDebug( int i ) {
	debug=i;
    }

    public void setUseThreadLoader( boolean t ) {
	useThreadLoader=t;
    }
    
    public void engineInit( ContextManager cm ) {
	if( useThreadLoader ) {
	    ClassLoader cl= cm.getParentClassLoader();
	    if( cl==null ) {
		cl=Thread.currentThread().getContextClassLoader();
		if( cl!=null )
		    cm.setParentClassLoader( cl );
	    }
	}
    }
    
    public void preServletInit( Context ctx, ServletWrapper sw )
	throws TomcatException
    {
	fixJDKContextClassLoader(ctx);
    }

    /** Servlet Destroy  notification
     */
    public void preServletDestroy( Context ctx, ServletWrapper sw )
	throws TomcatException
    {
	fixJDKContextClassLoader(ctx);
    }
    
    public void postServletInit( Context ctx, ServletWrapper sw )
	throws TomcatException
    {
	// no need to change the cl - next requst will do that
	// ( it's per-thread information )
    }
    
    /** Called before service method is invoked. 
     */
    public int preService(Request request, Response response) {
	if( request.getContext() == null ) return 0;
	fixJDKContextClassLoader(request.getContext());
	//	System.out.println("Setting class loader for service()");
	return 0;
    }

    
    
    // Before we do init() or service(), we need to do some tricks
    // with the class loader - see bug #116.
    // some JDK1.2 code will not work without this fix
    // we save the originalCL because we might be in include
    // and we need to revert to it when we finish
    // that will set a new (JDK)context class loader, and return the old one
    // if we are in JDK1.2
    // XXX move it to interceptor !!!
    final private void fixJDKContextClassLoader( Context ctx ) {
	final ClassLoader cl=ctx.getServletLoader().getClassLoader();
	if( cl==null ) {
	    System.out.println("ERROR: Jdk12Interceptor: classloader==null");
	    return;
	}
	// this may be called from include(), in which case we
	// have the codebase==jsp or servlet
	java.security.AccessController.doPrivileged(new
	    java.security.PrivilegedAction()
	    {
		public Object run()  {
		    Thread.currentThread().setContextClassLoader(cl);
		    return null;
		}
	    });
	
// 	try {
// 	    Thread t=Thread.currentThread();
// 	    t.setContextClassLoader( cl );
// 	    //	    System.out.println("Jdk12Interceptor: Setting CL " + cl );
// 	} catch( Throwable t ) {
// 	    t.printStackTrace();
// 	}
    }
    
}