abstractdecoder.java

用mina框架编写的转发代理服务程序,含自动更新功能

package com.frontMachine.codec;

import java.nio.charset.Charset;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.log4j.Logger;
import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IoSession;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
import org.apache.mina.filter.codec.demux.MessageDecoder;
import org.apache.mina.filter.codec.demux.MessageDecoderResult;


public abstract class AbstractDecoder implements MessageDecoder
{
	protected static Pattern pattern;
	protected static Charset charset;
	protected Matcher matcher;
	protected Logger logger;
		
	protected AbstractDecoder(){}
	
    public abstract MessageDecoderResult decodable( IoSession session, ByteBuffer in );  
    
    protected abstract String decodeBody( IoSession session, ByteBuffer in );

    public MessageDecoderResult decode( IoSession session, ByteBuffer in, ProtocolDecoderOutput out ) throws Exception
    {
        // Try to decode body
        String m = decodeBody( session, in );
        // 如果无法返回字符串,继续接收
        if( m == null )
        {
            return MessageDecoderResult.NEED_DATA;
        }
        out.write(m);
    	
        return MessageDecoderResult.OK; 
    }
   
}