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 *
 * Copyright 2014, Google Inc.
 * All rights reserved.
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 * 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.
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 * 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
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#ifndef __GRPCPP_CLIENT_CONTEXT_H__
#define __GRPCPP_CLIENT_CONTEXT_H__

#include <chrono>
#include <map>
#include <string>

#include <grpc/support/log.h>
#include <grpc/support/time.h>
#include <grpc++/config.h>

using std::chrono::system_clock;

struct grpc_call;
struct grpc_completion_queue;

namespace grpc {

class CallOpBuffer;
template <class R> class ClientReader;
template <class W> class ClientWriter;
template <class R, class W> class ClientReaderWriter;
template <class R> class ClientAsyncReader;
template <class W> class ClientAsyncWriter;
template <class R, class W> class ClientAsyncReaderWriter;

class ClientContext {
 public:
  ClientContext();
  ~ClientContext();

  void AddMetadata(const grpc::string &meta_key,
                   const grpc::string &meta_value);

  void set_absolute_deadline(const system_clock::time_point &deadline);
  system_clock::time_point absolute_deadline();

  void StartCancel();

 private:
  // Disallow copy and assign.
  ClientContext(const ClientContext &);
  ClientContext &operator=(const ClientContext &);

  friend class CallOpBuffer;
  friend class Channel;
  template <class R> friend class ::grpc::ClientReader;
  template <class W> friend class ::grpc::ClientWriter;
  template <class R, class W> friend class ::grpc::ClientReaderWriter;
  template <class R> friend class ::grpc::ClientAsyncReader;
  template <class W> friend class ::grpc::ClientAsyncWriter;
  template <class R, class W> friend class ::grpc::ClientAsyncReaderWriter;

  grpc_call *call() { return call_; }
  void set_call(grpc_call *call) {
    GPR_ASSERT(call_ == nullptr);
    call_ = call;
  }

  grpc_completion_queue *cq() { return cq_; }
  void set_cq(grpc_completion_queue *cq) { cq_ = cq; }

  gpr_timespec RawDeadline() { return absolute_deadline_; }

  bool initial_metadata_received_ = false;
  grpc_call *call_;
  grpc_completion_queue *cq_;
  gpr_timespec absolute_deadline_;
  std::multimap<grpc::string, grpc::string> send_initial_metadata_;
  std::multimap<grpc::string, grpc::string> recv_initial_metadata_;
  std::multimap<grpc::string, grpc::string> trailing_metadata_;
};

}  // namespace grpc

#endif  // __GRPCPP_CLIENT_CONTEXT_H__