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Tomcat example source code file (HandlerDispatch.java)

This example Tomcat source code file (HandlerDispatch.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

error, handlerdispatch, handlerdispatch, io, ioexception, jkhandler, jkhandler, max_handlers=32, msgcontext, msgcontext, received, register, reserved=16, string, string

The Tomcat HandlerDispatch.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.jk.common;

import java.io.IOException;

import org.apache.jk.core.JkHandler;
import org.apache.jk.core.Msg;
import org.apache.jk.core.MsgContext;




/**
 * Dispatch based on the message type. ( XXX make it more generic,
 * now it's specific to ajp13 ).
 * 
 * @author Costin Manolache
 */
public class HandlerDispatch extends JkHandler
{
    private static org.apache.juli.logging.Log log=
        org.apache.juli.logging.LogFactory.getLog( HandlerDispatch.class );

    public HandlerDispatch() 
    {
    }

    public void init() {
    }

    JkHandler handlers[]=new JkHandler[MAX_HANDLERS];
    String handlerNames[]=new String[MAX_HANDLERS];
    
    static final int MAX_HANDLERS=32;    
    static final int RESERVED=16;  // reserved names, backward compat
    int currentId=RESERVED;

    public int registerMessageType( int id, String name, JkHandler h,
                                    String sig[] )
    {
        if( log.isDebugEnabled() )
            log.debug( "Register message " + id + " " + h.getName() +
                 " " + h.getClass().getName());
	if( id < 0 ) {
	    // try to find it by name
	    for( int i=0; i< handlerNames.length; i++ ) {
                if( handlerNames[i]==null ) continue;
                if( name.equals( handlerNames[i] ) )
                    return i;
            }
	    handlers[currentId]=h;
            handlerNames[currentId]=name;
	    currentId++;
	    return currentId;
	}
	handlers[id]=h;
        handlerNames[currentId]=name;
	return id;
    }

    
    // -------------------- Incoming message --------------------

    public int invoke(Msg msg, MsgContext ep ) 
        throws IOException
    {
        int type=msg.peekByte();
        ep.setType( type );
        
        if( type > handlers.length ||
            handlers[type]==null ) {
	    if( log.isDebugEnabled() )
                log.debug( "Invalid handler " + type );
	    return ERROR;
	}

        if( log.isDebugEnabled() )
            log.debug( "Received " + type + " " + handlers[type].getName());
        
	JkHandler handler=handlers[type];
        
        return handler.invoke( msg, ep );
    }

 }

Other Tomcat examples (source code examples)

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