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This article mainly explains "what is the seata protocol". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the seata protocol".

Code entry

Io.seata.core.rpc.netty.NettyClientBootstrap#start

Bootstrap.handler (new ChannelInitializer () {@ Override public void initChannel (SocketChannel ch) {ChannelPipeline pipeline = ch.pipeline () Pipeline.addLast (new IdleStateHandler (nettyClientConfig.getChannelMaxReadIdleSeconds (), nettyClientConfig.getChannelMaxWriteIdleSeconds (), nettyClientConfig.getChannelMaxAllIdleSeconds () .addLast (new ProtocolV1Decoder ()) .addLast (new ProtocolV1Encoder ()) If (channelHandlers! = null) {addChannelPipelineLast (ch, channelHandlers);})

Io.seata.core.rpc.netty.v1.ProtocolV1Encoder#encode

Io.seata.core.protocol.RpcMessage

Protocol rules

2-byte modulus ([- 38 key 38]) | version number of 1 byte | length of 6 bytes | messageType of 1 byte | Codec value of 1 byte | compressor of 1 byte | messagID value of 4 bytes | header data value (2 bytes of key length | value data value) | Business data value

Codec: serialization type: such as seata,kryo;protobuf;fst

Compressor: compression type: such as NONE, GZIP,BZIP2,LZ4

A length of 6 bytes:

4 bytes (length of all data): default length 16+headLength+bodyLength

2 bytes (headLength) with a default length of 16

Business data serialization

Io.seata.serializer.seata.SeataSerializer#serialize

2 bytes (value of typecode) | body

Typecode: message type encoders such as (RegisterTMRequestCodec,BranchRollbackRequestCodec)

Body:

2 bytes (length of xid) | xid data | 8 bytes (branchId value) | one byte (branch transaction type normal value) | 2 bytes (length of ResourceId) | value of ResourceId | 4 bytes (length of applicationData) | value of applicationData |

Transaction type: AT,TCC,XA,SAGA

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