httpadapter.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. 
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 * 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.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * [Additional notices, if required by prior licensing conditions]
 *
 */ 
package org.apache.tomcat.adapter;

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


// We implement Response part of the adapter first, Request will be next

/**
 */
public final class HttpAdapter implements BufferListener {
    protected OutputStream sout;
    static int debug=0;
    ContextManager contextM;

    // hack - quick solution to keep only one object in pool
    RequestImpl req;
    ResponseImpl res;

    RecycleBufferedInputStream in;
    

    public static final int MAX_HEAD_LEN = 8 * 1024;
    byte buf[]=new byte[ MAX_HEAD_LEN ];
    int off=0;
    int count=0;

    // input stream
    int readLimit=-1;
    int readCount=0;
    
    private Socket socket;

    public static final String DEFAULT_CHARACTER_ENCODING = "8859_1";
    
    
    public HttpAdapter() {
        super();
    }

    // -------------------- Methods used by ConnectionHandler
    public void init(ContextManager contextM) {
	ByteBuffer ob=new ByteBuffer();
	ByteBuffer ib=new ByteBuffer();
	ob.addBufferListener( this );
	ib.addBufferListener( this );

	req=new RequestImpl();
	res=new ResponseImpl();
	res.setOutputBuffer( ob );
	req.setInputBuffer( ib );
	this.contextM=contextM;
	contextM.initRequest( req, res );
    }
    
    public void readNextRequest() throws IOException {
	readNextRequest( req, res );
	int contentLength = req.getContentLength();
	if (contentLength != -1) {
	    readLimit=contentLength;
	}
    }

    public void setSocket(Socket socket) throws IOException {
	if( in == null )
	    in =  new RecycleBufferedInputStream( socket.getInputStream());
	else
	    in.setInputStream( socket.getInputStream() );
	sout= socket.getOutputStream();
	
        this.socket = socket;
    }

    public Request getRequest() {
	return req;
    }

    public Response getResponse() {
	return res;
    }
    
    // -------------------- Other util methods

    public void recycle() {
 	bufferCount=0;
	readLimit=-1;
	readCount=0;
    }

    void log( String s ) {
	System.out.println("HttpAdapter: " + s );
    }

    public void setDebug(int debug) {
	this.debug=debug;
    }


    // -------------------- Buffer listener - implement IN/OUT
    
    /** Read from the input stream to fill a buffer.
     *  We read _once_ ( it may be a partial read, if not enough
     *  data available). Note that we read at least on byte -
     *  it's blocking IO.
     */
    public void bufferEmpty( BufferEvent ev ) {
	try {
	    // Find if this is the first chunk , if so do send head 
	    if( debug > 0 ) log( "Buffer empty event ");
	    
	    ByteBuffer bb=(ByteBuffer)ev.getSource();
	    ResponseImpl resp=(ResponseImpl)bb.getParent();
	    int len=ev.getLength();
	    if( readLimit >=0 ) {
		if( readCount + len >= readLimit ) {
		    len = readLimit - readCount;
		}
	    }
	    int n=0;
	    if( len >= 0 )
		n=in.read( ev.getByteBuffer(), ev.getOffset(), len );
	    ev.setLength( n );
	    readCount +=n;
	    if( debug > 0 ) log( "Read: " + readLimit + " " + readCount + " " + n + " " + len + " " + ev.getLength());
	} catch( IOException ex ) {
	    ex.printStackTrace();
	}
    }

    // Called when  we need to send  data
    public void bufferFull( BufferEvent ev ) {
	try {
	    // Find if this is the first chunk , if so do send head 
	    if( debug > 0 ) log( "Buffer full event ");
	    
	    ByteBuffer bb=(ByteBuffer)ev.getSource();
	    ResponseImpl resp=(ResponseImpl)bb.getParent();
	    
	    if( ! resp.isBufferCommitted() ) {
		// notify -
		resp.notifyEndHeaders();
		sendHead( resp );
		resp.setBufferCommitted( true );
	    }
	    sout.write( ev.getByteBuffer(), ev.getOffset(), ev.getLength() );
	} catch( IOException ex ) {
	    if( ! "Broken pipe".equals(ex.getMessage())) {
		ex.printStackTrace();
	    }
	}
    }


    // -------------------- Implementation methods--------------------
    // Response - sending the head
    
    protected static final int DEFAULT_HEAD_BUFFER_SIZE = 1024;
    protected byte[] headBuffer = new byte[DEFAULT_HEAD_BUFFER_SIZE];
    protected int bufferCount = 0;
    
    private void sendHead( ResponseImpl resp )  throws IOException {
	//	super.endHeaders(); // CM will notify endHeaders(), we just need to
	// do our job
	if( debug > 0 ) log( "Sending head ");

	Request request=resp.getRequest();
	int status= resp.getStatus();
	// XXX inefficient - will create 2 strings and a hashtable lookup
	String message=	ResponseImpl.getMessage( status );
	
	MimeHeaders headers=resp.getMimeHeaders();
	
	headAppend("HTTP/1.0 ");
	headAppend(String.valueOf(status));
	if(message!=null) {
	    headAppend(" ");
	    headAppend(message);
	}
	headAppend("\r\n");

	// Hack: set Date header. We need to implement append(date)
	MimeHeaderField dateH= headers.find( "Date" );
	if( false && dateH == null ) {
	    // no date header set by user
	    dateH=headers.putHeader();
	    dateH.setName("Date");
	    dateH.setDateValue(System.currentTimeMillis());
	    // will reuse the HttpDate instance
	}
	
	// Servlet Engine header will be set per/adapter - smarter adapters will
	// not send it every time ( have it in C side ), and we may also want
	// to add informations about the adapter used