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 *
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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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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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#ifndef __GRPCPP_CHANNEL_INTERFACE_H__
#define __GRPCPP_CHANNEL_INTERFACE_H__

#include <grpc++/status.h>

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

struct grpc_call;

namespace grpc {
class Call;
class CallOpBuffer;
class ClientContext;
class CompletionQueue;
class RpcMethod;
class CallInterface;

class ChannelInterface {
 public:
  virtual ~ChannelInterface() {}

  virtual Call CreateCall(const RpcMethod &method, ClientContext *context,
                          CompletionQueue *cq) = 0;
  virtual void PerformOpsOnCall(CallOpBuffer *ops, void *tag, Call *call) = 0;
};

// Wrapper that begins an asynchronous unary call
void AsyncUnaryCall(ChannelInterface *channel, const RpcMethod &method,
                    ClientContext *context,
                    const google::protobuf::Message &request,
                    google::protobuf::Message *result, Status *status,
                    CompletionQueue *cq, void *tag);

// Wrapper that performs a blocking unary call
Status BlockingUnaryCall(ChannelInterface *channel, const RpcMethod &method,
                         ClientContext *context,
                         const google::protobuf::Message &request,
                         google::protobuf::Message *result);

}  // namespace grpc

#endif  // __GRPCPP_CHANNEL_INTERFACE_H__