io.grpc.examples.helloworld.HelloReply Java Examples

@Test public void deprecated_clientParserTestStreamingResponse() {
  closeClient(client);
  grpcTracing = grpcTracing.toBuilder().clientParser(new GrpcClientParser() {
    int receiveCount = 0;

    @Override protected <M> void onMessageReceived(M message, SpanCustomizer span) {
      span.tag("grpc.message_received." + receiveCount++, message.toString());
    }
  }).build();
  client = newClient();

  Iterator<HelloReply> replies = GreeterGrpc.newBlockingStub(client)
      .sayHelloWithManyReplies(HelloRequest.newBuilder().setName("this is dog").build());
  assertThat(replies).toIterable().hasSize(10);

  // all response messages are tagged to the same span
  assertThat(testSpanHandler.takeRemoteSpan(CLIENT).tags()).hasSize(10);
}
 

/**
 * Say hello to server in a blocking unary call.
 */
public void greet(String name) {
  HelloRequest request = HelloRequest.newBuilder().setName(name).build();
  HelloReply response = null;
  StatusRuntimeException statusRuntimeException = null;
  try {
    response = blockingStub.sayHello(request);
  } catch (StatusRuntimeException e) {
    failedRpcs.incrementAndGet();
    statusRuntimeException = e;
  }

  totalRpcs.incrementAndGet();

  if (statusRuntimeException == null) {
    logger.log(Level.INFO,"Greeting: {0}", new Object[]{response.getMessage()});
  } else {
    logger.log(Level.INFO,"RPC failed: {0}", new Object[]{statusRuntimeException.getStatus()});
  }
}
 

@Before
public void setUp() throws Exception {
  GreeterImplBase greeterImplBase =
      new GreeterImplBase() {
        @Override
        public void sayHello(HelloRequest request, StreamObserver<HelloReply> responseObserver) {
          responseObserver.onNext(HelloReply.getDefaultInstance());
          responseObserver.onCompleted();
        }
      };
  // Generate a unique in-process server name.
  String serverName = InProcessServerBuilder.generateName();
  // Create a server, add service, start, and register for automatic graceful shutdown.
  grpcCleanup.register(InProcessServerBuilder.forName(serverName).directExecutor()
      .addService(ServerInterceptors.intercept(greeterImplBase, new HeaderServerInterceptor()))
      .build().start());
  // Create a client channel and register for automatic graceful shutdown.
  channel =
      grpcCleanup.register(InProcessChannelBuilder.forName(serverName).directExecutor().build());
}
 

@Test
public void requestWithNoCacheOptionSkipsCache() {
  HelloReply reply1 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);
  HelloReply reply2 =
      ClientCalls.blockingUnaryCall(
          channelToUse,
          safeGreeterSayHelloMethod,
          CallOptions.DEFAULT.withOption(SafeMethodCachingInterceptor.NO_CACHE_CALL_OPTION, true),
          message);
  HelloReply reply3 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);

  assertNotEquals(reply1, reply2);
  assertSame(reply1, reply3);
}
 

@Test public void serverParserTestWithStreamingResponse() throws IOException {
  grpcTracing = grpcTracing.toBuilder().serverParser(new GrpcServerParser() {
    int responsesSent = 0;

    @Override protected <M> void onMessageSent(M message, SpanCustomizer span) {
      span.tag("grpc.message_sent." + responsesSent++, message.toString());
    }
  }).build();
  init();

  Iterator<HelloReply> replies = GreeterGrpc.newBlockingStub(client)
      .sayHelloWithManyReplies(HELLO_REQUEST);
  assertThat(replies).toIterable().hasSize(10);
  // all response messages are tagged to the same span
  assertThat(testSpanHandler.takeRemoteSpan(Span.Kind.SERVER).tags()).hasSize(10);
}
 

@Override
protected String doInBackground(String... params) {
  String host = params[0];
  String message = params[1];
  String portStr = params[2];
  int port = TextUtils.isEmpty(portStr) ? 0 : Integer.valueOf(portStr);
  try {
    channel = ManagedChannelBuilder.forAddress(host, port).usePlaintext().build();
    GreeterGrpc.GreeterBlockingStub stub = GreeterGrpc.newBlockingStub(channel);
    HelloRequest request = HelloRequest.newBuilder().setName(message).build();
    HelloReply reply = stub.sayHello(request);
    return reply.getMessage();
  } catch (Exception e) {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    e.printStackTrace(pw);
    pw.flush();
    return String.format("Failed... : %n%s", sw);
  }
}
 

private void run(String[] args) throws InterruptedException {
  parseArgs(args);
  ExecutorService executor = Executors.newFixedThreadPool(1);
  ManagedChannel channel = AltsChannelBuilder.forTarget(serverAddress).executor(executor).build();
  try {
    GreeterGrpc.GreeterBlockingStub stub = GreeterGrpc.newBlockingStub(channel);
    HelloReply resp = stub.sayHello(HelloRequest.newBuilder().setName("Waldo").build());

    logger.log(Level.INFO, "Got {0}", resp);
  } finally {
    channel.shutdown();
    channel.awaitTermination(1, TimeUnit.SECONDS);
    // Wait until the channel has terminated, since tasks can be queued after the channel is
    // shutdown.
    executor.shutdown();
  }
}
 

void run() throws Exception {
  Server server = ServerBuilder.forPort(0).addService(new GreeterGrpc.GreeterImplBase() {
    @Override
    public void sayHello(HelloRequest request, StreamObserver<HelloReply> responseObserver) {
      Metadata trailers = new Metadata();
      trailers.put(DEBUG_INFO_TRAILER_KEY, DEBUG_INFO);
      responseObserver.onError(Status.INTERNAL.withDescription(DEBUG_DESC)
          .asRuntimeException(trailers));
    }
  }).build().start();
  channel =
      ManagedChannelBuilder.forAddress("localhost", server.getPort()).usePlaintext().build();

  blockingCall();
  futureCallDirect();
  futureCallCallback();
  asyncCall();
  advancedAsyncCall();

  channel.shutdown();
  server.shutdown();
  channel.awaitTermination(1, TimeUnit.SECONDS);
  server.awaitTermination();
}
 

@Before
public void setUp() throws Exception {
  GreeterImplBase greeterImplBase =
      new GreeterImplBase() {
        @Override
        public void sayHello(HelloRequest request, StreamObserver<HelloReply> responseObserver) {
          responseObserver.onNext(HelloReply.getDefaultInstance());
          responseObserver.onCompleted();
        }
      };
  // Generate a unique in-process server name.
  String serverName = InProcessServerBuilder.generateName();
  // Create a server, add service, start, and register for automatic graceful shutdown.
  grpcCleanup.register(InProcessServerBuilder.forName(serverName).directExecutor()
      .addService(ServerInterceptors.intercept(greeterImplBase, new HeaderServerInterceptor()))
      .build().start());
  // Create a client channel and register for automatic graceful shutdown.
  channel =
      grpcCleanup.register(InProcessChannelBuilder.forName(serverName).directExecutor().build());
}
 

@Test
public void responseNoCacheDirective_notCached() throws Exception {
  cacheControlDirectives.add("no-cache");

  HelloReply reply1 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);
  HelloReply reply2 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);

  assertNotEquals(reply1, reply2);
  assertNotEquals(reply1, reply2);
  Truth.assertThat(cache.internalCache).isEmpty();
  Truth.assertThat(cache.removedKeys).isEmpty();
}
 

void run() throws Exception {
  // Port 0 means that the operating system will pick an available port to use.
  Server server = ServerBuilder.forPort(0).addService(new GreeterGrpc.GreeterImplBase() {
    @Override
    public void sayHello(HelloRequest request, StreamObserver<HelloReply> responseObserver) {
      responseObserver.onError(Status.INTERNAL
          .withDescription("Eggplant Xerxes Crybaby Overbite Narwhal").asRuntimeException());
    }
  }).build().start();
  channel =
      ManagedChannelBuilder.forAddress("localhost", server.getPort()).usePlaintext().build();

  blockingCall();
  futureCallDirect();
  futureCallCallback();
  asyncCall();
  advancedAsyncCall();

  channel.shutdown();
  server.shutdown();
  channel.awaitTermination(1, TimeUnit.SECONDS);
  server.awaitTermination();
}
 

@Test
public void cacheHit_doesNotResetExpiration() throws Exception {
  cacheControlDirectives.add("max-age=1");

  HelloReply reply1 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);
  HelloReply reply2 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);

  sleepAtLeast(1001);

  HelloReply reply3 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);

  assertSame(reply1, reply2);
  assertNotEquals(reply1, reply3);
  Truth.assertThat(cache.internalCache).hasSize(1);
  Truth.assertThat(cache.removedKeys).hasSize(1);
}
 

/**
 * This is more advanced and does not make use of the stub.  You should not normally need to do
 * this, but here is how you would.
 */
void advancedAsyncCall() {
  ClientCall<HelloRequest, HelloReply> call =
      channel.newCall(GreeterGrpc.getSayHelloMethod(), CallOptions.DEFAULT);

  final CountDownLatch latch = new CountDownLatch(1);

  call.start(new ClientCall.Listener<HelloReply>() {

    @Override
    public void onClose(Status status, Metadata trailers) {
      Verify.verify(status.getCode() == Status.Code.INTERNAL);
      Verify.verify(status.getDescription().contains("Narwhal"));
      // Cause is not transmitted over the wire.
      latch.countDown();
    }
  }, new Metadata());

  call.sendMessage(HelloRequest.newBuilder().setName("Marge").build());
  call.halfClose();

  if (!Uninterruptibles.awaitUninterruptibly(latch, 1, TimeUnit.SECONDS)) {
    throw new RuntimeException("timeout!");
  }
}
 

@Override
protected String doInBackground(String... params) {
  String host = params[0];
  String message = params[1];
  String portStr = params[2];
  int port = TextUtils.isEmpty(portStr) ? 0 : Integer.valueOf(portStr);
  try {
    channel =
        OkHttpChannelBuilder.forAddress(host, port)
            .transportExecutor(new NetworkTaggingExecutor(0xFDD))
            .usePlaintext()
            .build();
    GreeterGrpc.GreeterBlockingStub stub = GreeterGrpc.newBlockingStub(channel);
    HelloRequest request = HelloRequest.newBuilder().setName(message).build();
    HelloReply reply = stub.sayHello(request);
    return reply.getMessage();
  } catch (Exception e) {
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    e.printStackTrace(pw);
    pw.flush();
    return String.format("Failed... : %n%s", sw);
  }
}
 

private void run(String[] args) throws InterruptedException {
  parseArgs(args);
  ExecutorService executor = Executors.newFixedThreadPool(1);
  ManagedChannel channel = AltsChannelBuilder.forTarget(serverAddress).executor(executor).build();
  try {
    GreeterGrpc.GreeterBlockingStub stub = GreeterGrpc.newBlockingStub(channel);
    HelloReply resp = stub.sayHello(HelloRequest.newBuilder().setName("Waldo").build());

    logger.log(Level.INFO, "Got {0}", resp);
  } finally {
    channel.shutdown();
    channel.awaitTermination(1, TimeUnit.SECONDS);
    // Wait until the channel has terminated, since tasks can be queued after the channel is
    // shutdown.
    executor.shutdown();
  }
}
 

@Test
public void cacheHit_doesNotResetExpiration() throws Exception {
  cacheControlDirectives.add("max-age=1");

  HelloReply reply1 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);
  HelloReply reply2 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);

  sleepAtLeast(1001);

  HelloReply reply3 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);

  assertSame(reply1, reply2);
  assertNotEquals(reply1, reply3);
  Truth.assertThat(cache.internalCache).hasSize(1);
  Truth.assertThat(cache.removedKeys).hasSize(1);
}
 

@Test
public void responseNoCacheDirective_notCached() throws Exception {
  cacheControlDirectives.add("no-cache");

  HelloReply reply1 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);
  HelloReply reply2 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);

  assertNotEquals(reply1, reply2);
  assertNotEquals(reply1, reply2);
  Truth.assertThat(cache.internalCache).isEmpty();
  Truth.assertThat(cache.removedKeys).isEmpty();
}
 

@Override
public void sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) {
  HelloReply reply =
      HelloReply.newBuilder().setMessage("Hey " + req.getName() + " " + count++).build();
  responseObserver.onNext(reply);
  responseObserver.onCompleted();
}
 

@Override
public Single<HelloReply> sayHello(Single<HelloRequest> request) {
    System.out.println("Executing thread is " + Thread.currentThread().getName());
    return request
            .map(HelloRequest::getName)
            .map(name -> {
                String greeting = "Hello " + name;
                System.out.println("Returning " + greeting);
                return greeting;
            })
            .map(greeting -> HelloReply.newBuilder().setMessage(greeting).build());
}
 

@Test
public void testInterceptors() {
    HelloReply reply = GreeterGrpc.newBlockingStub(channel)
            .sayHello(HelloRequest.newBuilder().setName("neo").build());
    assertThat(reply.getMessage()).isEqualTo("Hello neo");

    assertThat(interceptor1.getLastCall()).isNotZero();
    assertThat(interceptor2.getLastCall()).isNotZero();

    assertThat(interceptor2.getLastCall()).isGreaterThan(interceptor1.getLastCall());
}
 

public static void main(String[] args) {
    SslConfig sslConfig = new SslConfig();
    if (args.length > 0) {
        if (args.length != 1 && args.length != 3) {
            System.out.println(
                    "USAGE: BasicConsumer [trustCertCollectionFilePath [certChainFilePath privateKeyFilePath]]\n " +
                            "Specify 'certChainFilePath' and 'privateKeyFilePath' only if you need Mutual TLS.");
            System.exit(0);
        }

        switch (args.length) {
            case 1:
                sslConfig.setClientTrustCertCollectionPath(args[0]);
                break;
            case 3:
                sslConfig.setClientTrustCertCollectionPath(args[0]);
                sslConfig.setClientKeyCertChainPath(args[1]);
                sslConfig.setClientPrivateKeyPath(args[2]);
        }
    }

    DubboBootstrap bootstrap = DubboBootstrap.getInstance()
            .application(new ApplicationConfig("first-dubbo-consumer"))
            .registry(new RegistryConfig("zookeeper://127.0.0.1:2181"))
            .ssl(sslConfig);

    ReferenceConfig<IGreeter> reference = new ReferenceConfig<>();
    reference.setInterface(IGreeter.class);

    bootstrap.reference(reference);

    bootstrap.start();

    IGreeter service = bootstrap.getCache().get(reference);
    HelloReply helloReply = service.sayHello(HelloRequest.newBuilder().setName("dubbo").build());
    System.out.println(helloReply.getMessage());
}
 

@Override
public void sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) {
  // get client id added to context by interceptor
  String clientId = Constant.CLIENT_ID_CONTEXT_KEY.get();
  logger.info("Processing request from " + clientId);
  HelloReply reply = HelloReply.newBuilder().setMessage("Hello, " + req.getName()).build();
  responseObserver.onNext(reply);
  responseObserver.onCompleted();
}
 

@Override
public void sayHello(HelloRequest request, StreamObserver<HelloReply> responseObserver) {
    System.out.println("Executing thread is " + Thread.currentThread().getName());
    HelloReply reply = HelloReply.newBuilder().setMessage("Hello " + request.getName()).build();
    responseObserver.onNext(reply);
    responseObserver.onCompleted();
}
 

@Test
public void differentServiceCallsAreNotConflated() {
  MethodDescriptor<HelloRequest, HelloReply> anotherSafeMethod =
      AnotherGreeterGrpc.getSayHelloMethod().toBuilder().setSafe(true).build();

  HelloReply reply1 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);
  HelloReply reply2 =
      ClientCalls.blockingUnaryCall(
          channelToUse, anotherSafeMethod, CallOptions.DEFAULT, message);

  assertNotEquals(reply1, reply2);
}
 

@Test
public void clientHeaderDeliveredToServer() throws Exception {
  // Generate a unique in-process server name.
  String serverName = InProcessServerBuilder.generateName();
  // Create a server, add service, start, and register for automatic graceful shutdown.
  grpcCleanup.register(InProcessServerBuilder.forName(serverName).directExecutor()
      .addService(ServerInterceptors.intercept(new GreeterImplBase() {}, mockServerInterceptor))
      .build().start());
  // Create a client channel and register for automatic graceful shutdown.
  ManagedChannel channel = grpcCleanup.register(
      InProcessChannelBuilder.forName(serverName).directExecutor().build());
  GreeterBlockingStub blockingStub = GreeterGrpc.newBlockingStub(
      ClientInterceptors.intercept(channel, new HeaderClientInterceptor()));
  ArgumentCaptor<Metadata> metadataCaptor = ArgumentCaptor.forClass(Metadata.class);

  try {
    blockingStub.sayHello(HelloRequest.getDefaultInstance());
    fail();
  } catch (StatusRuntimeException expected) {
    // expected because the method is not implemented at server side
  }

  verify(mockServerInterceptor).interceptCall(
      ArgumentMatchers.<ServerCall<HelloRequest, HelloReply>>any(),
      metadataCaptor.capture(),
      ArgumentMatchers.<ServerCallHandler<HelloRequest, HelloReply>>any());
  assertEquals(
      "customRequestValue",
      metadataCaptor.getValue().get(HeaderClientInterceptor.CUSTOM_HEADER_KEY));
}
 

@Test
public void testInterceptorRegistration() {
    HelloReply reply = client
            .sayHello(HelloRequest.newBuilder().setName("neo").build());
    assertThat(reply.getMessage()).isEqualTo("Hello neo");
    assertThat(interceptor.getLastCall()).isNotZero();
}
 

@Test
public void unsafeCallsAreNotCached() {
  GreeterGrpc.GreeterBlockingStub stub = GreeterGrpc.newBlockingStub(channelToUse);

  HelloReply reply1 = stub.sayHello(message);
  HelloReply reply2 = stub.sayHello(message);

  assertNotEquals(reply1, reply2);
}
 

@Override
public void sayHello(HelloRequest req, StreamObserver<HelloReply> responseObserver) {
  HelloReply reply =
      HelloReply.newBuilder().setMessage("Hello " + req.getName() + " " + count++).build();
  responseObserver.onNext(reply);
  responseObserver.onCompleted();
}
 

@Test
public void responseMaxAgeZero_notAddedToCache() throws Exception {
  cacheControlDirectives.add("max-age=0");

  HelloReply reply1 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);
  HelloReply reply2 =
      ClientCalls.blockingUnaryCall(
          channelToUse, safeGreeterSayHelloMethod, CallOptions.DEFAULT, message);

  assertNotEquals(reply1, reply2);
  Truth.assertThat(cache.internalCache).isEmpty();
  Truth.assertThat(cache.removedKeys).isEmpty();
}
 

void asyncCall() {
  GreeterStub stub = GreeterGrpc.newStub(channel);
  HelloRequest request = HelloRequest.newBuilder().setName("Homer").build();
  final CountDownLatch latch = new CountDownLatch(1);
  StreamObserver<HelloReply> responseObserver = new StreamObserver<HelloReply>() {

    @Override
    public void onNext(HelloReply value) {
      // Won't be called.
    }

    @Override
    public void onError(Throwable t) {
      Status status = Status.fromThrowable(t);
      Verify.verify(status.getCode() == Status.Code.INTERNAL);
      Verify.verify(status.getDescription().contains("Overbite"));
      // Cause is not transmitted over the wire..
      latch.countDown();
    }

    @Override
    public void onCompleted() {
      // Won't be called, since the server in this example always fails.
    }
  };
  stub.sayHello(request, responseObserver);

  if (!Uninterruptibles.awaitUninterruptibly(latch, 1, TimeUnit.SECONDS)) {
    throw new RuntimeException("timeout!");
  }
}