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121 lines
2.9 KiB
C++
121 lines
2.9 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkCGNSCache.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkCGNSCache
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*
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* store an object in a container with its CGNS path key
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*
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*
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* @par Thanks:
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* Thanks to Mickael Philit
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*/
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#ifndef vtkCGNSCache_h
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#define vtkCGNSCache_h
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#include "vtkSmartPointer.h"
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#include <iterator>
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#include <sstream>
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#include <string>
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#include <unordered_map>
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namespace CGNSRead
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{
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// No priority and no size limit right now
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template <typename CacheDataType>
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class vtkCGNSCache
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{
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public:
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vtkCGNSCache();
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vtkSmartPointer<CacheDataType> Find(const std::string& query);
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void Insert(const std::string& key, const vtkSmartPointer<CacheDataType>& data);
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void ClearCache();
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void SetCacheSizeLimit(int size);
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int GetCacheSizeLimit();
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private:
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vtkCGNSCache(const vtkCGNSCache&) = delete;
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void operator=(const vtkCGNSCache&) = delete;
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typedef std::unordered_map<std::string, vtkSmartPointer<CacheDataType>> CacheMapper;
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CacheMapper CacheData;
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typename CacheMapper::iterator LastCacheAccess;
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int cacheSizeLimit;
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};
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template <typename CacheDataType>
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vtkCGNSCache<CacheDataType>::vtkCGNSCache()
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: CacheData()
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{
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this->cacheSizeLimit = -1;
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this->LastCacheAccess = CacheData.end();
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}
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template <typename CacheDataType>
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void vtkCGNSCache<CacheDataType>::SetCacheSizeLimit(int size)
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{
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this->cacheSizeLimit = size;
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}
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template <typename CacheDataType>
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int vtkCGNSCache<CacheDataType>::GetCacheSizeLimit()
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{
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return this->cacheSizeLimit;
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}
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template <typename CacheDataType>
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vtkSmartPointer<CacheDataType> vtkCGNSCache<CacheDataType>::Find(const std::string& query)
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{
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typename CacheMapper::iterator iter;
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iter = this->CacheData.find(query);
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if (iter == this->CacheData.end())
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return vtkSmartPointer<CacheDataType>(nullptr);
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this->LastCacheAccess = iter;
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return iter->second;
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}
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template <typename CacheDataType>
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void vtkCGNSCache<CacheDataType>::Insert(
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const std::string& key, const vtkSmartPointer<CacheDataType>& data)
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{
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if (this->cacheSizeLimit > 0 &&
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this->CacheData.size() >= static_cast<size_t>(this->cacheSizeLimit))
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{
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// Make some room by removing last accessed/inserted item
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this->CacheData.erase(this->LastCacheAccess);
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}
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this->CacheData[key] = data;
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this->LastCacheAccess = this->CacheData.find(key);
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}
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template <typename CacheDataType>
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void vtkCGNSCache<CacheDataType>::ClearCache()
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{
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this->CacheData.clear();
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}
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}
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#endif // vtkCGNSCache_h
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// VTK-HeaderTest-Exclude: vtkCGNSCache.h
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