text: /*
   *
   * Copyright 2015, Google Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   */
  
  #ifndef GRPCXX_IMPL_CLIENT_UNARY_CALL_H
  #define GRPCXX_IMPL_CLIENT_UNARY_CALL_H
  
  #include <grpc++/config.h>
  #include <grpc++/status.h>
  
  #include <grpc++/impl/call.h>
  
  namespace grpc {
  
  class ChannelInterface;
  class ClientContext;
  class CompletionQueue;
  class RpcMethod;
  
  // Wrapper that performs a blocking unary call
  template <class InputMessage, class OutputMessage>
  Status BlockingUnaryCall(ChannelInterface* channel, const RpcMethod& method,
                           ClientContext* context, const InputMessage& request,
                           OutputMessage* result) {
    CompletionQueue cq;
    Call call(channel->CreateCall(method, context, &cq));
    CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage,
              CallOpRecvInitialMetadata, CallOpRecvMessage<OutputMessage>,
              CallOpClientSendClose, CallOpClientRecvStatus> ops;
    Status status = ops.SendMessage(request);
    if (!status.ok()) {
      return status;
    }
    ops.SendInitialMetadata(context->send_initial_metadata_);
    ops.RecvInitialMetadata(context);
    ops.RecvMessage(result);
    ops.ClientSendClose();
    ops.ClientRecvStatus(context, &status);
    call.PerformOps(&ops);
    GPR_ASSERT((cq.Pluck(&ops) && ops.got_message) || !status.ok());
    return status;
  }
  
  }  // namespace grpc
  
  #endif  // GRPCXX_IMPL_CLIENT_UNARY_CALL_H
  