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Diffstat (limited to 'src/cpp/server/rpc_service_method.h')
-rw-r--r-- | src/cpp/server/rpc_service_method.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/cpp/server/rpc_service_method.h b/src/cpp/server/rpc_service_method.h new file mode 100644 index 0000000000..ac2badda71 --- /dev/null +++ b/src/cpp/server/rpc_service_method.h @@ -0,0 +1,131 @@ +/* + * + * Copyright 2014, 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 __GRPCPP_INTERNAL_SERVER_RPC_SERVICE_METHOD_H__ +#define __GRPCPP_INTERNAL_SERVER_RPC_SERVICE_METHOD_H__ + +#include <functional> +#include <map> +#include <memory> +#include <vector> + +#include "src/cpp/rpc_method.h" +#include <google/protobuf/message.h> +#include <grpc++/status.h> + +namespace grpc { + +// TODO(rocking): we might need to split this file into multiple ones. + +// Base class for running an RPC handler. +class MethodHandler { + public: + virtual ~MethodHandler() {} + struct HandlerParameter { + HandlerParameter(const google::protobuf::Message* req, google::protobuf::Message* resp) + : request(req), response(resp) {} + const google::protobuf::Message* request; + google::protobuf::Message* response; + }; + virtual ::grpc::Status RunHandler(const HandlerParameter& param) = 0; +}; + +// A wrapper class of an application provided rpc method handler. +template <class ServiceType, class RequestType, class ResponseType> +class RpcMethodHandler : public MethodHandler { + public: + RpcMethodHandler(std::function<::grpc::Status( + ServiceType*, const RequestType*, ResponseType*)> func, + ServiceType* service) + : func_(func), service_(service) {} + + ::grpc::Status RunHandler(const HandlerParameter& param) final { + // Invoke application function, cast proto messages to their actual types. + return func_(service_, dynamic_cast<const RequestType*>(param.request), + dynamic_cast<ResponseType*>(param.response)); + } + + private: + // Application provided rpc handler function. + std::function<::grpc::Status(ServiceType*, const RequestType*, ResponseType*)> + func_; + // The class the above handler function lives in. + ServiceType* service_; +}; + +// Server side rpc method class +class RpcServiceMethod : public RpcMethod { + public: + // Takes ownership of the handler and two prototype objects. + RpcServiceMethod(const char* name, MethodHandler* handler, + google::protobuf::Message* request_prototype, + google::protobuf::Message* response_prototype) + : RpcMethod(name), + handler_(handler), + request_prototype_(request_prototype), + response_prototype_(response_prototype) {} + + MethodHandler* handler() { return handler_.get(); } + + google::protobuf::Message* AllocateRequestProto() { return request_prototype_->New(); } + google::protobuf::Message* AllocateResponseProto() { + return response_prototype_->New(); + } + + private: + std::unique_ptr<MethodHandler> handler_; + std::unique_ptr<google::protobuf::Message> request_prototype_; + std::unique_ptr<google::protobuf::Message> response_prototype_; +}; + +// This class contains all the method information for an rpc service. It is +// used for registering a service on a grpc server. +class RpcService { + public: + // Takes ownership. + void AddMethod(RpcServiceMethod* method) { + methods_.push_back(std::unique_ptr<RpcServiceMethod>(method)); + } + + RpcServiceMethod* GetMethod(int i) { + return methods_[i].get(); + } + int GetMethodCount() const { return methods_.size(); } + + private: + std::vector<std::unique_ptr<RpcServiceMethod>> methods_; +}; + +} // namespace grpc + +#endif // __GRPCPP_INTERNAL_SERVER_RPC_SERVICE_METHOD_H__ |