Netty support for protocol buffer Multi-Protocol (eight)

Netty support for protocol buffer Multi-Protocol (eight)

I. BACKGROUND

　　In the last blog post, the author has shown how to use protocol Buffer in Netty, but the attentive user may find that the obvious disadvantage is that our handler can only handle a particular type, and our project cannot have only one type, So how does this problem work out? Many do not say, the author directly on the code.

Two. Code implementation

2.1 The writing of the message

Syntax ="Proto2";p ackage com.rsy.netty.protobuf;option java_package="Com.rsy.netty.protobuf"; option Java_outer_classname="Datainfo"; message datas{enumDataType {PersonType=1; Dogtype=2; } Required DataType Data_type=1; oneof type_data{ Person person=2; Dog Dog=3; }}message person{required Int32 ID=1; OptionalstringName =2; enumGender {male=1; Female=2; } Optional Gender Gender=3;} Message Dog {RequiredfloatHeight =1; Optionalstringcolor =2; Optional Int64 Age=3;}

2.2 Generate Java code, no longer repeat it here.

2.3 Server-side boot code

 Public classServertest { Public Static voidMain (string[] args)throwsException {eventloopgroup bossgroup=NewNioeventloopgroup (); Eventloopgroup Workergroup=NewNioeventloopgroup (); Try{serverbootstrap Serverbootstrap=NewServerbootstrap (); Serverbootstrap.group (Bossgroup, Workergroup). Channel (Nioserversocketchannel.class). Handler (NewLogginghandler (Loglevel.info)). Childhandler (NewServerchannelinitilizer ()); Channelfuture channelfuture= Serverbootstrap.bind (8989). sync ();        Channelfuture.channel (). Closefuture (). sync (); }finally{bossgroup.shutdowngracefully ();        Workergroup.shutdowngracefully (); }    }}

2.4 Service-side channel initialization code

 Public classServerchannelinitilizerextendsChannelinitializer<socketchannel>{@Overrideprotected voidInitchannel (Socketchannel ch)throwsException {Channelpipeline pipeline=Ch.pipeline (); Pipeline.addlast ("Protobufvarint32framedecoder",NewProtobufvarint32framedecoder ()); Pipeline.addlast ("Protobufdecoder",NewProtobufdecoder (DataInfo.Datas.getDefaultInstance ())); Pipeline.addlast ("Protobufvarint32lengthfieldprepender",NewProtobufvarint32lengthfieldprepender ()); Pipeline.addlast ("Protobufencoder",NewProtobufencoder ()); Pipeline.addlast ("Serverhandler",NewServerhandler ()); }}

2.5 Service-Side handler code

 Public classServerhandlerextendsSimplechannelinboundhandler<datainfo.datas>{@Overrideprotected voidChannelRead0 (Channelhandlercontext ctx, Datainfo.datas msg)throwsException {/*** Because the first person to write is the person.*/Datainfo.person P=Msg.getperson ();        System.out.println (Msg.getdatatype (). toString ());        System.out.println (P.getid ());        System.out.println (P.getgender (). toString ());                System.out.println (P.getname ()); Datainfo.datas Data=DataInfo.Datas.newBuilder (). Setdatatype (Datatype.dogtype) . Setdog (DataInfo.Dog.newBuilder (). SetA GE (23). SetColor (Red). SetHeight (3.5f) . Build ();    Ctx.writeandflush (data); }}

2.6 Client startup code

 Public classClienttest { Public Static voidMain (string[] args)throwsException {eventloopgroup eventloopgroup=NewNioeventloopgroup (); Try{Bootstrap Bootstrap=NewBootstrap (); Bootstrap.group (Eventloopgroup). Channel (Niosocketchannel.class). Handler (NewClientchannelinitializer ()); Channelfuture channelfuture= Bootstrap.connect ("localhost", 8989). sync ();        Channelfuture.channel (). Closefuture (). sync (); }finally{eventloopgroup.shutdowngracefully (); }    }}

2.7 Client channel initialization code

 Public classClientchannelinitializerextendsChannelinitializer<socketchannel>{@Overrideprotected voidInitchannel (Socketchannel ch)throwsException {Channelpipeline pipeline=Ch.pipeline (); Pipeline.addlast ("Protobufvarint32framedecoder",NewProtobufvarint32framedecoder ()); Pipeline.addlast ("Protobufdecoder",NewProtobufdecoder (DataInfo.Datas.getDefaultInstance ())); Pipeline.addlast ("Protobufvarint32lengthfieldprepender",NewProtobufvarint32lengthfieldprepender ()); Pipeline.addlast ("Protobufencoder",NewProtobufencoder ()); Pipeline.addlast ("ClientHandler",NewClientHandler ()); }}

2.8 Client Handler Processing code

 Public classClientHandlerextendsSimplechannelinboundhandler<datainfo.datas>{@Overrideprotected voidChannelRead0 (Channelhandlercontext ctx, Datainfo.datas msg)throwsException {/*** The server writes back the dog.*/Datainfo.dog Dog=Msg.getdog ();        System.out.println (Msg.getdatatype (). toString ());        System.out.println (Dog.getage ());        System.out.println (Dog.getcolor ());    System.out.println (Dog.getheight ()); } @Override Public voidChannelactive (Channelhandlercontext ctx)throwsException {datainfo.datas data=DataInfo.Datas.newBuilder (). Setdatatype (Datatype.persontype)                                            . Setperson (DataInfo.Person.newBuilder () . SetId (23). Setgender (Gender.female). Set Name ("Zhangsan") . Build ();    Ctx.writeandflush (data); }}

Three. Running

　　Run the service-side startup code, and then run the client startup code.

Netty support for protocol buffer Multi-Protocol (eight)