grpc/include/grpc++/impl/call.h

/*
 *
 * Copyright 2014, Google Inc.
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#ifndef __GRPCPP_CALL_H__
#define __GRPCPP_CALL_H__

#include <grpc++/status.h>
#include <grpc++/completion_queue.h>

#include <memory>
#include <vector>

namespace google {
namespace protobuf {
class Message;
}  // namespace protobuf
}  // namespace google

struct grpc_call;
struct grpc_op;

namespace grpc {

class ChannelInterface;

class CallOpBuffer final : public CompletionQueueTag {
 public:
  CallOpBuffer() : return_tag_(this) {}

  void Reset(void *next_return_tag);

  void AddSendInitialMetadata(std::vector<std::pair<grpc::string, grpc::string> > *metadata);
  void AddSendMessage(const google::protobuf::Message &message);
  void AddRecvMessage(google::protobuf::Message *message);
  void AddClientSendClose();
  void AddClientRecvStatus(Status *status);

  // INTERNAL API:

  // Convert to an array of grpc_op elements
  void FillOps(grpc_op *ops, size_t *nops);

  // Called by completion queue just prior to returning from Next() or Pluck()
  void FinalizeResult(void *tag, bool *status) override;

 private:
  void *return_tag_;
};

class CCallDeleter {
 public:
  void operator()(grpc_call *c);
};

// Straightforward wrapping of the C call object
class Call final {
 public:
  Call(grpc_call *call, ChannelInterface *channel, CompletionQueue *cq);

  void PerformOps(CallOpBuffer *buffer);

  grpc_call *call() { return call_.get(); }
  CompletionQueue *cq() { return cq_; }

 private:
  ChannelInterface *channel_;
  CompletionQueue *cq_;
  std::unique_ptr<grpc_call, CCallDeleter> call_;
};

}  // namespace grpc

#endif  // __GRPCPP_CALL_INTERFACE_H__