| /********************************************************************** |
| // @@@ START COPYRIGHT @@@ |
| // |
| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| // |
| // @@@ END COPYRIGHT @@@ |
| // |
| **********************************************************************/ |
| #ifndef _RU_EMP_CHECK_TASK_EXECUTOR_H_ |
| #define _RU_EMP_CHECK_TASK_EXECUTOR_H_ |
| |
| /* -*-C++-*- |
| ****************************************************************************** |
| * |
| * File: RuEmpCheckTaskExecutor.h |
| * Description: Definition of class CRUEmpCheckTaskExecutor. |
| * |
| * Created: 04/06/2000 |
| * Language: C++ |
| * |
| * |
| ****************************************************************************** |
| */ |
| |
| #include "refresh.h" |
| |
| #include "RuTaskExecutor.h" |
| |
| class CRUEmpCheckTask; |
| class CRUEmpCheck; |
| class CRUEmpCheckVector; |
| class CUOFsIpcMessageTranslator; |
| |
| //--------------------------------------------------------------------------// |
| // CRUEmpCheckTaskExecutor |
| // |
| // Performs the EmpCheck protocol. |
| // |
| // Also, computes and exports the current database timestamp |
| // and the emptiness check vector, which will be further |
| // forwarded to the client Refresh tasks. |
| // |
| // The whole execution is performed in a single step. |
| //--------------------------------------------------------------------------// |
| |
| class REFRESH_LIB_CLASS CRUEmpCheckTaskExecutor : public CRUTaskExecutor |
| { |
| private: |
| typedef CRUTaskExecutor inherited; |
| |
| public: |
| CRUEmpCheckTaskExecutor(CRUTask *pParentTask = NULL); |
| virtual ~CRUEmpCheckTaskExecutor(); |
| |
| //----------------------------------// |
| // Accessors |
| //----------------------------------// |
| public: |
| const CRUEmpCheckVector &GetEmpCheckVector() const; |
| |
| public: |
| // These functions serialize/de-serialize the executor's context |
| // for the message communication with the remote server process |
| |
| // Used in the main process side |
| virtual void StoreRequest(CUOFsIpcMessageTranslator &translator); |
| virtual void LoadReply(CUOFsIpcMessageTranslator &translator); |
| |
| // Used in the remote process side |
| virtual void LoadRequest(CUOFsIpcMessageTranslator &translator); |
| virtual void StoreReply(CUOFsIpcMessageTranslator &translator); |
| |
| //----------------------------------// |
| // Mutators |
| //----------------------------------// |
| public: |
| //-- Single execution step. |
| //-- Implementation of pure virtual functions |
| virtual void Work(); |
| virtual void Init(); |
| |
| protected: |
| enum { SIZE_OF_PACK_BUFFER = 1000 }; |
| |
| //-- Implementation of pure virtual |
| // LCOV_EXCL_START :cnu |
| virtual Lng32 GetIpcBufferSize() const |
| { |
| return SIZE_OF_PACK_BUFFER; // Initial size |
| } |
| // LCOV_EXCL_STOP |
| |
| private: |
| enum STATES { EX_CHECK = REMOTE_STATES_START }; |
| |
| private: |
| //-- Prevent copying |
| CRUEmpCheckTaskExecutor(const CRUEmpCheckTaskExecutor &other); |
| CRUEmpCheckTaskExecutor &operator = (const CRUEmpCheckTaskExecutor &other); |
| |
| private: |
| //-- Work() callees |
| void PerformEmptinessCheck(); |
| |
| private: |
| CRUEmpCheck *pEmpCheck_; |
| }; |
| |
| #endif |