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/**
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* Tencent is pleased to support the open source community by making Tars available.
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*
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* Copyright (C) 2016THL A29 Limited, a Tencent company. All rights reserved.
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*
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* Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
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* in compliance with the License. You may obtain a copy of the License at
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*
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* https://opensource.org/licenses/BSD-3-Clause
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*
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* Unless required by applicable law or agreed to in writing, software distributed
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* under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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* CONDITIONS OF ANY KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations under the License.
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*/
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#ifndef __PATCH_CACHE_H_
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#define __PATCH_CACHE_H_
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#include <string>
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#include <map>
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#include <vector>
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#include "util/tc_monitor.h"
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const size_t SIZE_BUMEM_MIN = 1 * 1024 * 1024;
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const size_t SIZE_BUMEM_MAX = 100 * 1024 * 1024;
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class PatchCache
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{
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private:
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enum FileLoad
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{
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EM_NLOAD = 0,
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EM_LOADING = 1,
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EM_RELOAD = 2,
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EM_LOADED = 3
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};
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struct MemState
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{
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string FileName; //文件路径
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size_t FileSize; //文件大小
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size_t FileInode; //Inode索引号
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time_t FileTime; //文件创建时间
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char * MemBuf; //该块内存的起始地址
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size_t MemSize; //该块内存的大小
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size_t MemCount; //指向该块内存的数目
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time_t MemTime; //该块内存最后操纵时间
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FileLoad MemLoad; //该块内存已经加载成功
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};
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public:
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void setMemOption(const size_t MemMax, const size_t MemMin, const size_t MemNum)
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{
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_MemMax = MemMax > SIZE_BUMEM_MAX ? SIZE_BUMEM_MAX : MemMax;
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_MemMin = MemMin < SIZE_BUMEM_MIN ? SIZE_BUMEM_MIN : MemMin;
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_MemNum = MemNum;
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}
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int load(const std::string & sFile, std::pair<char *, size_t> & mem);
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int release(const std::string & sFile);
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private:
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int __loadFile(const std::string & sFile, char * szBuff, size_t sizeLen);
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int __getMem (const std::string & sFile, struct MemState *& cur);
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private:
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tars::TC_ThreadLock _mutex;
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std::vector<MemState *> _vecMems;
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std::map<std::string, MemState *> _mapFiles;
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size_t _MemMax;
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size_t _MemMin;
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size_t _MemNum;
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};
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#endif
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