/*
* Copyright 2008-2009 the original author or authors.
*
* Licensed 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 net.hasor.rsf.protocol.rsf;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import net.hasor.rsf.RsfEnvironment;
import net.hasor.rsf.domain.ProtocolStatus;
import net.hasor.rsf.domain.RequestInfo;
import net.hasor.rsf.domain.ResponseInfo;
import net.hasor.rsf.utils.ProtocolUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import static net.hasor.rsf.domain.RsfConstants.*;
/**
* RSF 解码器
* @version : 2014年10月10日
* @author 赵永春(zyc@hasor.net)
*/
public class RsfDecoder extends LengthFieldBasedFrameDecoder {
protected Logger logger = LoggerFactory.getLogger(getClass());
private RsfEnvironment rsfEnvironment;
//
public RsfDecoder(RsfEnvironment rsfEnvironment, int maxBodyLength) {
// lengthFieldOffset = 10
// lengthFieldLength = 3
// lengthAdjustment = 0
// initialBytesToStrip = 0
super(maxBodyLength, 10, 3, 0, 0);
this.rsfEnvironment = rsfEnvironment;
}
//
/*解码*/
protected Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
ByteBuf frame = (ByteBuf) super.decode(ctx, in);
if (frame == null) {
return null;
}
//
byte rsfHead = frame.getByte(0);//协议头
short status = this.doDecode(rsfHead, ctx, frame);//协议解析
if (status != ProtocolStatus.OK) {
frame = frame.resetReaderIndex().skipBytes(1);
long requestID = frame.readLong();
ResponseInfo info = ProtocolUtils.buildResponseStatus(this.rsfEnvironment, requestID, status, null);
ctx.pipeline().writeAndFlush(info);
}
return null;
}
protected ByteBuf extractFrame(ChannelHandlerContext ctx, ByteBuf buffer, int index, int length) {
return buffer.slice(index, length);
}
//
/**协议解析*/
private short doDecode(byte rsfHead, ChannelHandlerContext ctx, ByteBuf frame) {
CodecAdapter factory = CodecAdapterFactory.getCodecAdapterByVersion(this.rsfEnvironment, (byte) (rsfHead & 0x0F));
// - RSF_InvokerRequest
if (RSF_InvokerRequest == rsfHead) {
try {
RequestInfo info = factory.readRequestInfo(frame);// <-1.解码二进制数据。
info.setReceiveTime(System.currentTimeMillis());// <-2.设置接收时间戳
info.setMessage(false);
//
ctx.fireChannelRead(info);
return ProtocolStatus.OK;/*正常处理后返回*/
} catch (IOException e) {
logger.error("decode request error :" + e.getMessage(), e);
return ProtocolStatus.ProtocolError;
}
}
// - RSF_MessageRequest
if (RSF_MessageRequest == rsfHead) {
try {
RequestInfo info = factory.readRequestInfo(frame);// <-1.解码二进制数据。
info.setReceiveTime(System.currentTimeMillis());// <-2.设置接收时间戳
info.setMessage(true);
//
ctx.fireChannelRead(info);
return ProtocolStatus.OK;/*正常处理后返回*/
} catch (IOException e) {
logger.error("decode request error :" + e.getMessage(), e);
return ProtocolStatus.ProtocolError;
}
}
// RSF_Response
if (RSF_Response == rsfHead) {
try {
ResponseInfo info = factory.readResponseInfo(frame);// <-1.解码二进制数据。
info.setReceiveTime(System.currentTimeMillis());// <-2.设置接收时间戳
ctx.fireChannelRead(info);
return ProtocolStatus.OK;/*正常处理后返回*/
} catch (IOException e) {
logger.error("decode response error :" + e.getMessage(), e);
return ProtocolStatus.ProtocolError;
}
}
return ProtocolStatus.ProtocolUndefined;
}
}