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| | | package com.dy.common.mw.protocol.p206V202404; |
| | | |
| | | import com.dy.common.mw.channel.tcp.PrefixedDataAvailableStatus; |
| | | import com.dy.common.mw.protocol.AnnotationPrefixedDataAvailable; |
| | | import com.dy.common.mw.protocol.PrefixedDataAvailable; |
| | | import com.dy.common.util.ByteUtil; |
| | | import org.apache.logging.log4j.LogManager; |
| | | import org.apache.logging.log4j.Logger; |
| | | import org.apache.mina.core.buffer.BufferDataException; |
| | | import org.apache.mina.core.buffer.IoBuffer; |
| | | import org.apache.mina.core.session.IoSession; |
| | | |
| | | |
| | | @AnnotationPrefixedDataAvailable( |
| | | protocolName = ProtocolConstantV206V202404.protocolName, |
| | | protocolVersion = ProtocolConstantV206V202404.protocolVer, |
| | | priority = ProtocolConstantV206V202404.priority, |
| | | onLineDataMinLength = ProtocolConstantV206V202404.onLineDataMinLength, |
| | | headMinLength = ProtocolConstantV206V202404.headMinLength) |
| | | @SuppressWarnings("unused") |
| | | public class PrefixedDataAvailableV202404 implements PrefixedDataAvailable { |
| | | |
| | | private static final Logger log = LogManager.getLogger(PrefixedDataAvailableV202404.class) ; |
| | | |
| | | private static final String protocolName = ProtocolConstantV206V202404.protocolName ; |
| | | private static final short protocolVersion = ProtocolConstantV206V202404.protocolVer ; |
| | | |
| | | |
| | | /** |
| | | * 分析上线数据(网络连接后第一包数据)是否可获得 |
| | | * @param in IoBuffer |
| | | * @param remain 一定时大于0的数据 |
| | | * @param minDataLength 最小数据长度 |
| | | * @param maxDataLength 最大数据长度,达到或超过此长度,认为是垃圾数据。例如:数据头部是正确的,但合法数据结尾总不出现,认为此数据垃圾数据 |
| | | * @return 不是本协议数据时返回空 |
| | | * @throws Exception 异常 |
| | | */ |
| | | public PrefixedDataAvailableStatus forOnLine(IoSession ioSession, |
| | | IoBuffer in, |
| | | int remain, |
| | | int minDataLength, //对应ProtocolConstantV2_0.onLineDataMinLength |
| | | int maxDataLength //对应ProtocolConstant.errorMaxLength |
| | | ) throws Exception { |
| | | |
| | | int oldPosition = in.position() ; |
| | | byte[] preByte = new byte[remain]; |
| | | in.get(preByte) ; |
| | | //in.position(0) ;//错误用法,如果发生粘包数据,将会死循环 |
| | | in.position(oldPosition) ; |
| | | |
| | | return this.doForData(ioSession, preByte, minDataLength, maxDataLength) ; |
| | | } |
| | | |
| | | /** |
| | | * 分析上线后(网络连接后非第一包数据)是否可获得 |
| | | * @param in IoBuffer |
| | | * @param remain 剩余 |
| | | * @param minDataLength 最小数据长度 |
| | | * @param maxDataLength 最大数据长度 |
| | | * @return PrefixedDataAvailableStatus |
| | | * @throws Exception 异常 |
| | | */ |
| | | @Override |
| | | public PrefixedDataAvailableStatus forUpData(IoSession ioSession, |
| | | IoBuffer in, |
| | | int remain, |
| | | int minDataLength, |
| | | int maxDataLength) throws Exception { |
| | | int oldPosition = in.position() ; |
| | | byte[] preByte = new byte[remain]; |
| | | in.get(preByte) ; |
| | | //in.position(0) ;//错误用法,如果发生粘包数据,将会死循环 |
| | | in.position(oldPosition) ; |
| | | |
| | | return this.doForData(ioSession, preByte, minDataLength, maxDataLength) ; |
| | | |
| | | } |
| | | /** |
| | | * 进行判断 |
| | | * @param ioSession ioSession |
| | | * @param preByte byte[] |
| | | * @param minDataLength 最小数据长度 |
| | | * @param maxDataLength 最大数据长度 |
| | | * @return PrefixedDataAvailableStatus |
| | | * @throws Exception 异常 |
| | | */ |
| | | private PrefixedDataAvailableStatus doForData(IoSession ioSession, byte[] preByte, int minDataLength, int maxDataLength) throws Exception{ |
| | | int remain = preByte.length ; |
| | | |
| | | if (remain < minDataLength) { |
| | | log.warn("基于协议(" + protocolName + ")判断数据头部发生断包现象。") ; |
| | | return new PrefixedDataAvailableStatus().breaked() ; |
| | | } |
| | | |
| | | if(remain >= maxDataLength){ |
| | | //超出了最大长度限制,例如:数据头部是正确的,但合法数据结尾总不出现,认为此数据垃圾数据 |
| | | return new PrefixedDataAvailableStatus().rubbish(remain) ; |
| | | } |
| | | |
| | | |
| | | CommonV202404 parseCommon = new CommonV202404(); |
| | | boolean isThisProtocolData = parseCommon.isThisProtocolHead(preByte) ; |
| | | |
| | | if(!isThisProtocolData){ |
| | | //不是本协议数据 |
| | | return null ; |
| | | } |
| | | |
| | | Integer frameLen = parseCommon.parseFrameLen(preByte) ; |
| | | |
| | | if(frameLen == null){ |
| | | String headHex = ByteUtil.bytes2Hex(preByte, true) ; |
| | | throw new BufferDataException("收到数据之帧前部:" + headHex + ",但严重错误,在进行断包与粘包检查时,未能得到数据帧的长度。"); |
| | | } |
| | | |
| | | if (frameLen <= 0 || frameLen > maxDataLength) { |
| | | String headHex = ByteUtil.bytes2Hex(preByte, true) ; |
| | | throw new BufferDataException("收到数据之帧前部:" + headHex + ",但严重错误,在进行断包与粘包检查时,数据帧的长度(" + frameLen + ")超出合法范围。"); |
| | | } |
| | | |
| | | if(remain == frameLen){ |
| | | //不断不粘 |
| | | return new PrefixedDataAvailableStatus().completed(frameLen, protocolName, protocolVersion) ; |
| | | }else if(remain > frameLen){ |
| | | String headHex = ByteUtil.bytes2Hex(preByte, true) ; |
| | | log.warn("收到数据之帧前部:" + headHex + ",但发生粘包现象。") ; |
| | | return new PrefixedDataAvailableStatus().adjoined(frameLen, protocolName, protocolVersion) ; |
| | | }else{ |
| | | // remain < dataLen |
| | | String headHex = ByteUtil.bytes2Hex(preByte, true) ; |
| | | log.warn("收到数据之帧前部:" + headHex + ",但发生断包现象。") ; |
| | | return new PrefixedDataAvailableStatus().breaked() ; |
| | | } |
| | | } |
| | | |
| | | } |