avro learning rpc

最新推荐文章于 2025-08-03 03:02:40 发布

mooninday

最新推荐文章于 2025-08-03 03:02:40 发布

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本文链接：https://blog.youkuaiyun.com/mooninday/article/details/17355543

本文介绍Apache Avro协议的基本结构及其在Java中的具体实现，包括IDL定义、编译过程及客户端与服务端通信流程。通过示例展示了如何定义Avro协议、编译IDL文件并实现基于此协议的服务端响应及客户端请求。

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protocol

{"namespace": "com.test.avro",
 "protocol": "AvroTestInterface",
 
 "types": [
     {
      "name":"typ",
      "type":"enum",
      "symbols":["remote", "local"]
     },
     
     {
      "name": "SObj", 
      "type": "record",
      "fields": [
          {"name": "data", "type": "bytes"},
          {"name": "styp", "type": "typ"}
      ]
     }
 ],

 // bool put(SObj req);
 "messages": {
     "put": { //method name
         "request": [{"name": "req", "type": "SObj"}], // method parameters
         "response": "boolean" // return type
     }
 }
}

java -jar avro-tools-1.7.5.jar compile protocol D:\...\protocol_test.avpr D:\...\src\main\java

server:

public class Server extends GenericResponder {
    private Protocol protocol;

    public Server(Protocol protocol, int port) {
        super(protocol);
        this.protocol = protocol;
    }

    @Override
    public Object respond(Message message, Object request){
        GenericRecord sObject = (GenericRecord) (((GenericRecord) request).get("req"));

        EnumSymbol sObjTyp = (EnumSymbol) sObject.get("styp");
        EnumSymbol styp2 = new GenericData.EnumSymbol(protocol.getType("typ"), "remote");

        String key = sObject.get("key").toString();
        ByteBuffer bb = (ByteBuffer) sObject.get("data");
        byte[] datas = new byte[bb.capacity()];
        bb.get(datas);

        if (!sObjTyp.equals(styp2)) {                
            return false;
        }

        process(key, datas);
        return true;
    }

    public static void main(String[] args) throws Exception {
        int port = 10086;
        Protocol p = Protocol.parse(new File("avpr file"));
        HttpServer server = new HttpServer(new Server(p,port);
        server.start();
    }
}

client

public class Client {

    private final String url = "http://localhost:10086";
    private Protocol protocol;

    public Client(Protocol protocol) {
        this.protocol = protocol;
    }

    public void sendMessage() throws Exception {
        ByteBuffer data; // get data

        EnumSymbol styp = new GenericData.EnumSymbol(protocol.getType("typ"), "remote");

        GenericRecord sObj = new GenericData.Record(protocol.getType("SObj"));
        sObject.put("key", "key");
        sObject.put("data", data);
        sObject.put("styp", styp);

        GenericRecord request = new GenericData.Record(protocol.getMessages().get("put").getRequest());
        request.put("putReq", sObject);

        Transceiver t = new HttpTransceiver(new URL(url));
        GenericRequestor requestor = new GenericRequestor(protocol, t);
        try {
            Object o = requestor.request("put", request);

            System.out.println("response=" + o);
        } catch (Exception e) {
            System.out.println(e.getMsg());
        }
    }

    public static void main(String[] args) throws Exception {
        Protocol p = Protocol.parse(new File("avpr file"));
        Client client = newClient(p);
        client.sendMessage();
    }
}

idl

@namespace("com.test.avro")
protocol AvroTestInterface{

    enum typ{
        remote,
        local
    }
    
    record SObj{
        string key;
        bytes data;
        typ styp;
    }
    
    boolean put(SObject putReq);
}

java -jar avro-tools-1.7.5.jar idl D:\...\protocol_test.avdl D:\...\protocol_test.avpr