GRPC? ???? Java ???? ??? ??? ??????. 2. .Proto ??? ?? ??? ??? ?????. 3. Maven?? GRPC ???? ???? ??? ?????. 4. GRPC ?? ?? ??; 5. ?????? ?? ???; 6. TLS, ?? ??, ??? ?? ? ?? ???? ?? ???? ?????????. ??? ?? ????? ??-?? ???? ??? ?? ???? ???? ??????.

??? Java MicroServices ????? ???? GRPC? ???? ????? ?? ??. ?? ?? ? ?? ???? ????? ? ??? ?? ??? ? ??????? ??? ????? ??? ? ??????? ?????. ???? ?? ???? ??? ??? ????.

GRPC? Java ???? ???? ??? ??

??? ?? ?? ?? MicroServices ???? GRPC? ? ? ??? ? ? ????.

• ??? : HTTP/2 ? ?? ??? (???? ??)? ????? HTTP/1.1?? JSON?? ??? ?????.
• ??? ?? : ??? ????? ? ??? ??? .proto ??? ???? API? ????? ??? ?? ?????.
• ?? ?? ?? : ???? ? ? ???? ??? Java (? ?? ??)? ?? ????? ? ?? ??? ?????.
• ???? ?? : GRPC? ?? ????, ????? ???? ? Bididirectional Streaming? ?????. ??? ?? ??? ?? ??? ?????.

???? ?? ???? (? : ?? ??? ?? ?? ???) GRPC? ?? ??? ??? ???? ???? ? ????.

1 ?? : ???? ??? ???? ??????

.proto ??? ???? ??????. ??? ??? ??? ??? ?????? ?????.

? : inventory.proto

 ?? = "proto3";

??? com.example.inventory;

??? ?? ??? {
  rpc getStock (StockRequest) ?? (StockResponse);
}

??? StockRequest {
  ??? product_id = 1;
}

??? stockresponse {
  int32 availing_count = 1;
}

??? ??? ??? ???? ??? ???? ?????. ?? ???? ???? ?? .proto ??? ?? ?? ?? ???? ??????.

2 ?? : Java ?????? GRPC? ??????

Maven ?? Gradle? ??????. ??? ?? Maven Setup ( pom.xml )???.

 <???>
  <???>
    <groupid> io.grpc </groupid>
    <artifactid> grpc-netty-shaded </artifactid>
    <??> 1.58.0 </??>
  </???>
  <???>
    <groupid> io.grpc </groupid>
    <artifactid> grpc-protobuf </artifactid>
    <??> 1.58.0 </??>
  </???>
  <???>
    <groupid> io.grpc </groupid>
    <artifactid> grpc-stub </artifactid>
    <??> 1.58.0 </??>
  </???>
</???>

<??>
  <???>
    <???>
      <groupid> kr.motd.maven </groupid>
      <artifactid> os-maven-plugin </artifactid>
      <??> 1.7.1 </??>
    </??>
  </Extensions>
  <????>
    <????>
      <groupid> org.xolstice.maven.plugins </groupid>
      <artifactid> protobuf-maven-plugin </artifactid>
      <??> 0.6.1 </??>
      <??>
        <protosourceroot> $ {project.basedir}/src/main/proto </protoSourceroot>
        <outputDirectory> $ {project.build.directory}/Generated-Sources </outputDirectory>
        <ClearOutPutDirectory> false </staroutputDirectory>
      </??>
      <??>
        <??>
          <??>
            <Goal> Compile </Goal>
            <Goal> Compile-Custom </Goal>
          </??>
        </??>
      </??>
    </????>
  </????>
</??>

??? ?? ? ? ?? :

 MVN ???

????? ?????? ???, ?? ? ??? ??? ???? .proto ???? Java ???? ?????.

3 ?? : ?? ??

?? ? InventoryServiceGrpc.InventoryServiceImplBase ???? ???? ????.

 IO.GRPC.SERVER ?? ??;
IO.GRPC.SERVERBUILDER ?? ??;
import java.io.ioexception;

?? ??? ???? ?? {

  ?? ?? ??;

  public void start ()? ioexception {
    Server = ServerBuilder.forport (8080)
        .addservice (new inventoryserviceimpl ())
        .??()
        .??();

    System.out.println ( "?? 8080?? ??? ??");

    runtime.getRuntime (). addShutdownHook (? ??? (() -> {
      System.out.println ( "GRPC ?? ??");
      InventoryServer.this.stop ();
    });

    blockuntIlShutdown ();
  }

  ?? void blockuntilShutdown ()? ?? ? ?? ?? {
    if (server! = null) {
      server.awaittermination ();
    }
  }

  ?? void stop () {
    if (server! = null) {
      server.shutdown ();
    }
  }

  public static void main (String [] args)? ioexception? ???, InterruptedException {
    ? ?? ?? (). start ();
  }

  ?? ??? ???? viceimpl? inventoryservicegrpc.inventoryserviceimplbase {{
    @??
    public void getStock (StockRequest ??, StreamObserver <StockResponse> ResponseObserver) {
      // ?? ?????
      int stock = "p123".equals (request.getProductId ())? 42 : 0;

      stockresponse response = stockresponse.newbuilder ()
          .SetAvailAbleCount (??)
          .??();

      ResponseObserver.onnext (??);
      ResponseObserver.oncompleted ();
    }
  }
}

?? ?? - ??? ???? GRPC ??? ????.

4 ?? : ?? ???? ??? (?????)?? ???? ?????.

?? ?? ??? (? : ?? ???)?? GRPC ?????? ??????.

 ?? ??? ???? ??? {

  ?? ?? ???? ?? GRPC.InventoryServiceBlockingStub BlockingStub;

  ?? ???? ??? (??? ???, int ??) {
    ManagedChannel Channel = ManagedChannelBuilder.foraddress (???, ??)
        .usePlainText () // tls??? ??? ???? ????
        .??();

    BlockingStub = InventoryServiceGrpc.NewBlockingStub (??);
  }

  public int getstock (String productId) {
    StockRequest Request = StockRequest.NewBuilder (). SetProductId (productId) .build ();
    StockRepronse ?? = BlockingStub.getStock (??);
    return response.getavailableCount ();
  }
}

??? ?? ??????.

 ???? ????? ????? = ??? ?? ????? ( "LocalHost", 8080);
int stock = client.getstock ( "p123");
System.out.println ( "?? :"??);

?? ????? ?

• ???? TLS ?? : ?? ??? ? ???? ???????. GRPC? ???? SSL/TLS? ?????.
• GRPC ?? ??? ??? ?????? . ?? ?? ??? Status ? StatusException ??????.
• ??? ??? ?? : Consul, Eureka ?? Kubernetes DNS? ?? ??? GRPC? ???????.
• ?? ??? ?? : ??, ??? (? : ???? ??) ? ?? ?? (? : OpenTelemetry)? ????? ??????.
• ??? ?? ?? ????? .. .proto ??? ??? ????, ???? ??? ????, ?? ??? ?????.

???

Java MicroServices ??? GRPC? ??, ?? ?? ? ??? ?????? ?????. ?? ?? : ? ???? ???? ???? ?? ???? ??????. ???? ????, ?? ? ????? ??????.

?? ??? ??? ???? (? : ???? ?????? ??? ??) ??? ? ?? ??????? ???? ?? ? ????.

????? .proto ????, ??? ????, ??? ????, ??????? ??????.

? ??? Java ???? ??? ?????? GRPC? ?????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!