98 lines
3.5 KiB
C++
98 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef INCLUDED_TILECACHE_HPP
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#define INCLUDED_TILECACHE_HPP
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#include <fstream>
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#include <memory>
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#include <set>
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#include <string>
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#include <Poco/File.h>
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#include <Poco/Timestamp.h>
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#include <Poco/Mutex.h>
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using Poco::FastMutex;
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/** Handles the cache for tiles of one document.
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The cache consists of 2 cache directories:
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* persistent - that always represents the document as is saved
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* editing - that represents the document in the current state (with edits)
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The editing cache is cleared on startup, and copied to the persistent on each save.
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*/
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class TileCache
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{
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public:
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/// When the docURL is a non-file:// url, the timestamp has to be provided by the caller.
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/// For file:// url's, it's ignored.
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/// When it is missing for non-file:// url, it is assumed the document must be read, and no cached value used.
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TileCache(const std::string& docURL, const std::string& timestamp);
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std::unique_ptr<std::fstream> lookupTile(int part, int width, int height, int tilePosX, int tilePosY, int tileWidth, int tileHeight);
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void saveTile(int part, int width, int height, int tilePosX, int tilePosY, int tileWidth, int tileHeight, const char *data, size_t size);
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std::string getTextFile(std::string fileName);
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/// Notify the cache that the document was saved - to copy tiles from the Editing cache to Persistent.
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void documentSaved();
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/// Notify whether we need to use the Editing cache.
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void setEditing(bool editing = true);
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// The parameter is a message
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void saveTextFile(const std::string& text, std::string fileName);
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// The tiles parameter is an invalidatetiles: message as sent by the child process
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void invalidateTiles(const std::string& tiles);
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void invalidateTiles(int part, int x, int y, int width, int height);
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private:
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/// Toplevel cache dirname.
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std::string toplevelCacheDirName();
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/// Path of the (sub-)cache dir, the parameter specifies which (sub-)cache to use.
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std::string cacheDirName(bool useEditingCache);
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std::string cacheFileName(int part, int width, int height, int tilePosX, int tilePosY, int tileWidth, int tileHeight);
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bool parseCacheFileName(std::string& fileName, int& part, int& width, int& height, int& tilePosX, int& tilePosY, int& tileWidth, int& tileHeight);
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/// Extract location from fileName, and check if it intersects with [x, y, width, height].
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bool intersectsTile(std::string& fileName, int part, int x, int y, int width, int height);
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/// Load the timestamp from modtime.txt.
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Poco::Timestamp getLastModified();
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/// Store the timestamp to modtime.txt.
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void saveLastModified(const Poco::Timestamp& timestamp);
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/// Create or cleanup the cache directory.
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/// For non-file:// protocols, the timestamp has to be provided externally.
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void setup(const std::string& timestamp);
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const std::string& _docURL;
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/// The document is being edited.
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bool _isEditing;
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/// We have some unsaved changes => use the Editing cache.
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bool _hasUnsavedChanges;
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/// Set of tiles that we want to remove from the Persistent cache on the next save.
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std::set<std::string> _toBeRemoved;
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Poco::FastMutex _cacheMutex;
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};
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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