public static GreeterFutureStub newFutureStub(
      io.grpc.Channel channel) {
    return new GreeterFutureStub(channel);
  }
Creates a new ListenableFuture-style stub that supports unary calls on the service
agent-module/plugins-it/google-grpc-it/google-grpc-1-8-it/src/test/java/io/grpc/examples/helloworld/GreeterGrpc.java