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lightweight message queue, service bus

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package org.zbus.remoting;

import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

import org.zbus.remoting.znet.Codec;
import org.zbus.remoting.znet.IoBuffer;

public class MessageCodec implements Codec{
	@Override
	public IoBuffer encode(Object obj) { 
		if(!(obj instanceof Message)){ 
			throw new RuntimeException("Message unknown"); 
		} 
		
		Message msg = (Message)obj;   
		IoBuffer buf = IoBuffer.allocate(msg.estimatedSize()+256);
		buf.put(msg.getMetaString()+"\r\n");
		Map headers = msg.getHead();
		
		int contentLength = 0;
		if(msg.getBody() != null){
			contentLength = msg.getBody().length;
		}
		String lenKey = "content-length"; 
		
		Iterator> iter = headers.entrySet().iterator();
		while(iter.hasNext()){
			Entry e = iter.next();
			buf.put(e.getKey() + ": " + e.getValue() + "\r\n");
		} 
		if(!headers.containsKey(lenKey)){
			buf.put(lenKey + ": " + contentLength + "\r\n");
		}
		
		buf.put("\r\n");
		if(msg.getBody() != null){
			buf.put(msg.getBody());
		} 
		buf.flip();
		return buf; 
	}
       
	@Override
	public Object decode(IoBuffer buf) {  
		int headerIdx = findHeaderEnd(buf);
		if(headerIdx == -1) return null; 
		
		int headerLen = headerIdx+1-buf.position();
		
		buf.mark();
		Message msg = new Message();  
		msg.decodeHeaders(buf.array(), buf.position(), headerLen);
		buf.position(buf.position()+headerLen);
		
		String contentLength = msg.getHeadOrParam("content-length");
		if(contentLength == null){ //just head 
			return msg;
		}
		
		int bodyLen = Integer.valueOf(contentLength); 
		if(buf.remaining()