include/grpc++/impl/service_type.h

/*
 *
 * Copyright 2015, Google Inc.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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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 GRPCXX_IMPL_SERVICE_TYPE_H
#define GRPCXX_IMPL_SERVICE_TYPE_H

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

namespace grpc {

class Call;
class CompletionQueue;
class RpcService;
class Server;
class ServerCompletionQueue;
class ServerContext;

class SynchronousService {
 public:
  virtual ~SynchronousService() {}
  virtual RpcService* service() = 0;
};

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

  virtual void SendInitialMetadata(void* tag) = 0;

 private:
  friend class Server;
  virtual void BindCall(Call* call) = 0;
};

class AsynchronousService {
 public:
  // this is Server, but in disguise to avoid a link dependency
  class DispatchImpl {
   public:
    virtual void RequestAsyncCall(void* registered_method,
                                  ServerContext* context,
                                  ::grpc::protobuf::Message* request,
                                  ServerAsyncStreamingInterface* stream,
                                  CompletionQueue* call_cq,
                                  ServerCompletionQueue* notification_cq,
                                  void* tag) = 0;
  };

  AsynchronousService(const char** method_names, size_t method_count)
      : dispatch_impl_(nullptr),
        method_names_(method_names),
        method_count_(method_count),
        request_args_(nullptr) {}

  ~AsynchronousService() { delete[] request_args_; }

 protected:
  void RequestAsyncUnary(int index, ServerContext* context,
                         grpc::protobuf::Message* request,
                         ServerAsyncStreamingInterface* stream,
                         CompletionQueue* call_cq,
                         ServerCompletionQueue* notification_cq, void* tag) {
    dispatch_impl_->RequestAsyncCall(request_args_[index], context, request,
                                     stream, call_cq, notification_cq, tag);
  }
  void RequestClientStreaming(int index, ServerContext* context,
                              ServerAsyncStreamingInterface* stream,
                              CompletionQueue* call_cq,
                              ServerCompletionQueue* notification_cq,
                              void* tag) {
    dispatch_impl_->RequestAsyncCall(request_args_[index], context, nullptr,
                                     stream, call_cq, notification_cq, tag);
  }
  void RequestServerStreaming(int index, ServerContext* context,
                              grpc::protobuf::Message* request,
                              ServerAsyncStreamingInterface* stream,
                              CompletionQueue* call_cq,
                              ServerCompletionQueue* notification_cq,
                              void* tag) {
    dispatch_impl_->RequestAsyncCall(request_args_[index], context, request,
                                     stream, call_cq, notification_cq, tag);
  }
  void RequestBidiStreaming(int index, ServerContext* context,
                            ServerAsyncStreamingInterface* stream,
                            CompletionQueue* call_cq,
                            ServerCompletionQueue* notification_cq, void* tag) {
    dispatch_impl_->RequestAsyncCall(request_args_[index], context, nullptr,
                                     stream, call_cq, notification_cq, tag);
  }

 private:
  friend class Server;
  DispatchImpl* dispatch_impl_;
  const char** const method_names_;
  size_t method_count_;
  void** request_args_;
};

}  // namespace grpc

#endif  // GRPCXX_IMPL_SERVICE_TYPE_H