6a7a014d14
Otherwise we have a problem when cached information is different than the actual one maintained by LOKitDocument, keeping the whole server setup in an inconsistent state. For example, when client reloads the browser session quickly after setting the current part (to say 3) of an opened part document. If the reload occurs soon enough before the 'setclientpart' message originated from the client is acknowledged by the server, then the next reload would get the cached 'status' entry asking the client to set 'currentpart' to something else leading to the generation of another 'setclientpart' message. This thing would go on, and we would run into a loop, as I have for the last few hours. Change-Id: Ia6260dfb772f2e3f023572aa060fd7da92b196c8 Reviewed-on: https://gerrit.libreoffice.org/22272 Reviewed-by: Ashod Nakashian <ashnakash@gmail.com> Tested-by: Ashod Nakashian <ashnakash@gmail.com>
107 lines
4 KiB
C++
107 lines
4 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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// Saves a font / style / etc rendering
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// The dir parameter should be the type of rendering, like "font", "style", etc
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void saveRendering(const std::string& name, const std::string& dir, const char *data, size_t size);
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std::unique_ptr<std::fstream> lookupRendering(const std::string& name, const std::string& dir);
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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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// Removes the given file from both editing and persistent cache
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void removeFile(const std::string fileName);
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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(const 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(const 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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