| // Copyright 2016 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| // Author: cheesy@google.com (Steve Hill) |
| |
| #ifndef PAGESPEED_CONTROLLER_EXPENSIVE_OPERATION_RPC_HANDLER_H_ |
| #define PAGESPEED_CONTROLLER_EXPENSIVE_OPERATION_RPC_HANDLER_H_ |
| |
| #include "pagespeed/controller/controller.pb.h" |
| #include "pagespeed/controller/controller.grpc.pb.h" |
| #include "pagespeed/controller/rpc_handler.h" |
| #include "pagespeed/kernel/base/basictypes.h" |
| #include "pagespeed/kernel/base/function.h" |
| #include "pagespeed/kernel/util/grpc.h" |
| #include "pagespeed/controller/expensive_operation_controller.h" |
| #include "pagespeed/controller/request_result_rpc_handler.h" |
| |
| namespace net_instaweb { |
| |
| // RpcHandler for ExpensiveOperationController. |
| // |
| // The request message on the RPC contains no payload, it's just the client |
| // saying "I have something expensive to do now, let me know when". This |
| // will trigger a call to HandleClientRequest() which we use to call |
| // ScheduleExpensiveOperation(). When the controller decides if it will allow |
| // the rewrite to proceed, RequestResultRpcHandler returns that decision to |
| // the client. Once the client completes, it sends another Request message, |
| // which will trigger a call to HandleClientResult() and we in-turn call |
| // NotifyExpensiveOperationComplete(). |
| // |
| // If the client disconnects after requesting an operation but before sending a |
| // second "completed" message, we receive a call to HandleOperationFailed() and |
| // will call NotifyExpensiveOperationComplete() on the controller, so it can |
| // release "locks". |
| |
| class ExpensiveOperationRpcHandler |
| : public RequestResultRpcHandler< |
| ExpensiveOperationRpcHandler, ExpensiveOperationController, |
| grpc::CentralControllerRpcService::AsyncService, |
| ScheduleExpensiveOperationRequest, |
| ScheduleExpensiveOperationResponse> { |
| protected: |
| ExpensiveOperationRpcHandler( |
| grpc::CentralControllerRpcService::AsyncService* service, |
| ::grpc::ServerCompletionQueue* cq, |
| ExpensiveOperationController* controller); |
| |
| // RequestResultRpcHandler implementation. |
| void HandleClientRequest( |
| const ScheduleExpensiveOperationRequest& req, Function* cb) override; |
| void HandleClientResult( |
| const ScheduleExpensiveOperationRequest& req) override; |
| void HandleOperationFailed() override; |
| |
| void InitResponder(grpc::CentralControllerRpcService::AsyncService* service, |
| ::grpc::ServerContext* ctx, ReaderWriterT* responder, |
| ::grpc::ServerCompletionQueue* cq, |
| void* callback) override; |
| |
| private: |
| // Allow access to protected constructor. |
| friend class RequestResultRpcHandler; |
| friend class ExpensiveOperationRpcHandlerTest; |
| |
| DISALLOW_COPY_AND_ASSIGN(ExpensiveOperationRpcHandler); |
| }; |
| |
| } // namespace net_instaweb |
| |
| #endif // PAGESPEED_CONTROLLER_EXPENSIVE_OPERATION_RPC_HANDLER_H_ |