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gRPC integration that uses the brave api to submit client and server side span information.
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package io.grpc.examples.helloworld;

import static io.grpc.stub.ClientCalls.asyncUnaryCall;
import static io.grpc.stub.ClientCalls.asyncServerStreamingCall;
import static io.grpc.stub.ClientCalls.asyncClientStreamingCall;
import static io.grpc.stub.ClientCalls.asyncBidiStreamingCall;
import static io.grpc.stub.ClientCalls.blockingUnaryCall;
import static io.grpc.stub.ClientCalls.blockingServerStreamingCall;
import static io.grpc.stub.ClientCalls.futureUnaryCall;
import static io.grpc.MethodDescriptor.generateFullMethodName;
import static io.grpc.stub.ServerCalls.asyncUnaryCall;
import static io.grpc.stub.ServerCalls.asyncServerStreamingCall;
import static io.grpc.stub.ServerCalls.asyncClientStreamingCall;
import static io.grpc.stub.ServerCalls.asyncBidiStreamingCall;

@javax.annotation.Generated("by gRPC proto compiler")
public class GreeterGrpc {

  private GreeterGrpc() {}

  public static final String SERVICE_NAME = "helloworld.Greeter";

  // Static method descriptors that strictly reflect the proto.
  @io.grpc.ExperimentalApi
  public static final io.grpc.MethodDescriptor METHOD_SAY_HELLO =
      io.grpc.MethodDescriptor.create(
          io.grpc.MethodDescriptor.MethodType.UNARY,
          generateFullMethodName(
              "helloworld.Greeter", "SayHello"),
          io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.examples.helloworld.HelloRequest.getDefaultInstance()),
          io.grpc.protobuf.ProtoUtils.marshaller(io.grpc.examples.helloworld.HelloReply.getDefaultInstance()));

  public static GreeterStub newStub(io.grpc.Channel channel) {
    return new GreeterStub(channel);
  }

  public static GreeterBlockingStub newBlockingStub(
      io.grpc.Channel channel) {
    return new GreeterBlockingStub(channel);
  }

  public static GreeterFutureStub newFutureStub(
      io.grpc.Channel channel) {
    return new GreeterFutureStub(channel);
  }

  public static interface Greeter {

    public void sayHello(io.grpc.examples.helloworld.HelloRequest request,
        io.grpc.stub.StreamObserver responseObserver);
  }

  public static interface GreeterBlockingClient {

    public io.grpc.examples.helloworld.HelloReply sayHello(io.grpc.examples.helloworld.HelloRequest request);
  }

  public static interface GreeterFutureClient {

    public com.google.common.util.concurrent.ListenableFuture sayHello(
        io.grpc.examples.helloworld.HelloRequest request);
  }

  public static class GreeterStub extends io.grpc.stub.AbstractStub
      implements Greeter {
    private GreeterStub(io.grpc.Channel channel) {
      super(channel);
    }

    private GreeterStub(io.grpc.Channel channel,
        io.grpc.CallOptions callOptions) {
      super(channel, callOptions);
    }

    @java.lang.Override
    protected GreeterStub build(io.grpc.Channel channel,
        io.grpc.CallOptions callOptions) {
      return new GreeterStub(channel, callOptions);
    }

    @java.lang.Override
    public void sayHello(io.grpc.examples.helloworld.HelloRequest request,
        io.grpc.stub.StreamObserver responseObserver) {
      asyncUnaryCall(
          getChannel().newCall(METHOD_SAY_HELLO, getCallOptions()), request, responseObserver);
    }
  }

  public static class GreeterBlockingStub extends io.grpc.stub.AbstractStub
      implements GreeterBlockingClient {
    private GreeterBlockingStub(io.grpc.Channel channel) {
      super(channel);
    }

    private GreeterBlockingStub(io.grpc.Channel channel,
        io.grpc.CallOptions callOptions) {
      super(channel, callOptions);
    }

    @java.lang.Override
    protected GreeterBlockingStub build(io.grpc.Channel channel,
        io.grpc.CallOptions callOptions) {
      return new GreeterBlockingStub(channel, callOptions);
    }

    @java.lang.Override
    public io.grpc.examples.helloworld.HelloReply sayHello(io.grpc.examples.helloworld.HelloRequest request) {
      return blockingUnaryCall(
          getChannel(), METHOD_SAY_HELLO, getCallOptions(), request);
    }
  }

  public static class GreeterFutureStub extends io.grpc.stub.AbstractStub
      implements GreeterFutureClient {
    private GreeterFutureStub(io.grpc.Channel channel) {
      super(channel);
    }

    private GreeterFutureStub(io.grpc.Channel channel,
        io.grpc.CallOptions callOptions) {
      super(channel, callOptions);
    }

    @java.lang.Override
    protected GreeterFutureStub build(io.grpc.Channel channel,
        io.grpc.CallOptions callOptions) {
      return new GreeterFutureStub(channel, callOptions);
    }

    @java.lang.Override
    public com.google.common.util.concurrent.ListenableFuture sayHello(
        io.grpc.examples.helloworld.HelloRequest request) {
      return futureUnaryCall(
          getChannel().newCall(METHOD_SAY_HELLO, getCallOptions()), request);
    }
  }

  private static final int METHODID_SAY_HELLO = 0;

  private static class MethodHandlers implements
      io.grpc.stub.ServerCalls.UnaryMethod,
      io.grpc.stub.ServerCalls.ServerStreamingMethod,
      io.grpc.stub.ServerCalls.ClientStreamingMethod,
      io.grpc.stub.ServerCalls.BidiStreamingMethod {
    private final Greeter serviceImpl;
    private final int methodId;

    public MethodHandlers(Greeter serviceImpl, int methodId) {
      this.serviceImpl = serviceImpl;
      this.methodId = methodId;
    }

    @java.lang.SuppressWarnings("unchecked")
    public void invoke(Req request, io.grpc.stub.StreamObserver responseObserver) {
      switch (methodId) {
        case METHODID_SAY_HELLO:
          serviceImpl.sayHello((io.grpc.examples.helloworld.HelloRequest) request,
              (io.grpc.stub.StreamObserver) responseObserver);
          break;
        default:
          throw new AssertionError();
      }
    }

    @java.lang.SuppressWarnings("unchecked")
    public io.grpc.stub.StreamObserver invoke(
        io.grpc.stub.StreamObserver responseObserver) {
      switch (methodId) {
        default:
          throw new AssertionError();
      }
    }
  }

  public static io.grpc.ServerServiceDefinition bindService(
      final Greeter serviceImpl) {
    return io.grpc.ServerServiceDefinition.builder(SERVICE_NAME)
        .addMethod(
          METHOD_SAY_HELLO,
          asyncUnaryCall(
            new MethodHandlers<
              io.grpc.examples.helloworld.HelloRequest,
              io.grpc.examples.helloworld.HelloReply>(
                serviceImpl, METHODID_SAY_HELLO)))
        .build();
  }
}