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3e80a52995
This reverts commit 350a2b513446462120946241cf7fb1bb67ca828b, reversing changes made to 590a981195289be702bc7bf5382ece25a09ae6bb.
119 lines
4.6 KiB
C++
119 lines
4.6 KiB
C++
/***************************************************************************
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qgsmslayercache.h
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-------------------
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begin : September 21, 2007
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copyright : (C) 2007 by Marco Hugentobler
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email : marco dot hugentobler at karto dot baug dot ethz dot ch
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef QGSMSLAYERCACHE_H
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#define QGSMSLAYERCACHE_H
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#include <time.h>
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#include <QFileSystemWatcher>
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#include <QMultiHash>
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#include <QObject>
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#include <QPair>
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#include <QString>
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class QgsMapLayer;
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struct QgsMSLayerCacheEntry
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{
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time_t creationTime; //time this layer was created
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time_t lastUsedTime; //last time this layer was in use
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QString url; //datasource url
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QgsMapLayer* layerPointer;
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QList<QString> temporaryFiles; //path to the temporary files written for the layer
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QString configFile; //path to the project file associated with the layer
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bool operator==( const QgsMSLayerCacheEntry& other ) const
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{
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return ( creationTime == other.creationTime
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&& lastUsedTime == other.lastUsedTime
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&& url == other.url
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&& layerPointer == other.layerPointer
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&& temporaryFiles == other.temporaryFiles
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&& configFile == other.configFile );
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}
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};
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/** A singleton class that caches layer objects for the
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QGIS mapserver*/
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class QgsMSLayerCache: public QObject
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{
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Q_OBJECT
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public:
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static QgsMSLayerCache* instance();
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~QgsMSLayerCache();
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/** Inserts a new layer into the cash
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@param url the layer datasource
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@param layerName the layer name (to distinguish between different layers in a request using the same datasource
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@param configFile path of the config file (to invalidate entries if file changes). Can be empty (e.g. layers from sld)
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@param tempFiles some layers have temporary files. The cash makes sure they are removed when removing the layer from the cash*/
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void insertLayer( const QString& url, const QString& layerName, QgsMapLayer* layer, const QString& configFile = QString(), const QList<QString>& tempFiles = QList<QString>() );
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/** Searches for the layer with the given url.
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@return a pointer to the layer or 0 if no such layer*/
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QgsMapLayer* searchLayer( const QString& url, const QString& layerName, const QString& configFile = QString() );
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int projectsMaxLayers() const { return mProjectMaxLayers; }
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void setProjectMaxLayers( int n ) { mProjectMaxLayers = n; }
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//for debugging
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void logCacheContents() const;
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//! Expose method for use in server interface
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void removeProjectLayers( const QString& path );
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protected:
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//! Protected singleton constructor
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QgsMSLayerCache();
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/** Goes through the list and removes entries and layers
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depending on their time stamps and the number of other
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layers*/
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void updateEntries();
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//! Removes the cash entry with the lowest 'lastUsedTime'
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void removeLeastUsedEntry();
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//! Frees memory and removes temporary files of an entry
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void freeEntryRessources( QgsMSLayerCacheEntry& entry );
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private:
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/** Cash entries with pair url/layer name as a key. The layer name is necessary for cases where the same
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url is used several time in a request. It ensures that different layer instances are created for different
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layer names*/
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QMultiHash<QPair<QString, QString>, QgsMSLayerCacheEntry> mEntries;
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//! Config files used in the cache (with reference counter)
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QHash< QString, int > mConfigFiles;
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//! Check for configuration file updates (remove layers from cache if configuration file changes)
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QFileSystemWatcher mFileSystemWatcher;
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//! Maximum number of layers in the cache
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int mDefaultMaxLayers;
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//! Maximum number of layers in the cache, overrides DEFAULT_MAX_N_LAYERS if larger
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int mProjectMaxLayers;
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private slots:
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//! Removes entries from a project (e.g. if a project file has changed)
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void removeProjectFileLayers( const QString& project );
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};
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#endif
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