159 lines
4.3 KiB
C++
159 lines
4.3 KiB
C++
/*
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* This file is a part of Winix
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* and is distributed under the 2-Clause BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2008-2021, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef headerfile_winix_templates_patterncacher
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#define headerfile_winix_templates_patterncacher
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#include <vector>
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#include <map>
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#include "misc.h"
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#include "ezc.h"
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#include "core/winixbase.h"
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#include "models/item.h"
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namespace Winix
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{
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class PatternCacher : public WinixBase
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{
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public:
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PatternCacher();
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// setting when we should delete patterns
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// we are deleting when we have more (or equal) patterns than 'when_delete'
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// and then we are deleting 'how_many_del' patterns
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void SetWhenDelete(size_t when_delete, size_t how_many_del);
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// remembering a pointer to ezc objects
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// this ezc objects (functions) will be cached in patterns
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void SetEzcObjects(Ezc::Objects<HtmlTextStream> * obj);
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// remembering a pointer to ezc functions
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// this functions (pointers to them) will be cached in patterns
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void SetEzcFunctions(TemplatesFunctions::EzcFun * fun);
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// remembering a pointer to ezc blocks
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// this blocks (pointers to them) will be cached in patterns
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void SetEzcBlocks(Ezc::Blocks * blocks);
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// returning a pattern corresponding to the 'item'
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Ezc::Pattern * GetPattern(const Item & item);
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// updating the pattern for the item
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// if there is no such a pattern the method does nothing
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void UpdatePattern(const Item & item);
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// deleting the pattern for the item
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// if there is no such a pattern the method does nothing
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void DeletePattern(const Item & item);
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// deleting some rarely used patters
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// call it at the end of a request (or at the beginning)
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void DeleteOldPatterns();
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// size of the current cache in use
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size_t Size();
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// rebuild cache in all patterns
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void RebuildCache();
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// clearing all pointers to functions and blocks
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void ClearCache();
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private:
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struct PatternUsed
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{
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Ezc::Pattern pattern;
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int used; // how many times used (incremented by GetPattern and UpdatePattern)
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int item_id;
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};
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typedef std::map<long, PatternUsed> PatternTab;
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PatternTab pattern_tab;
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// temporarily struct used during deleting some items from pattern_tab
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struct PatternErase
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{
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PatternTab::iterator iter;
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int used;
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bool operator<(const PatternErase & p) const { return used < p.used; }
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};
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// temporarily buffer used during deleting some items from pattern_tab
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std::vector<PatternErase> erase_tab;
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void CreatePattern(const Item & item, Ezc::Pattern & pattern);
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void AddIndexes(const Item & item, size_t pattern_index);
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Ezc::Pattern * AddPattern(const Item & item);
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// the size of pattern_tab when we are deleting some items
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size_t when_delete_patterns;
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// how many items to delete
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size_t how_many_delete;
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// can be null
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TemplatesFunctions::EzcFun * ezc_fun;
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// can be null
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Ezc::Blocks * ezc_blocks;
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// can be null
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Ezc::Objects<HtmlTextStream> * ezc_obj;
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// parser for patterns
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Ezc::PatternParser pattern_parser;
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void RebuildCache(Ezc::Pattern & pattern);
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};
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} // namespace Winix
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#endif
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