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qgsmslayercache.cpp
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qgsmslayercache.cpp
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/***************************************************************************
qgsmslayercache.cpp
-------------------
begin : September 22, 2007
copyright : (C) 2007 by Marco Hugentobler
email : marco dot hugentobler at karto dot baug dot ethz dot ch
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgsmslayercache.h"
#include "qgsmessagelog.h"
#include "qgsproject.h"
#include "qgsmaplayer.h"
#include "qgsvectorlayer.h"
#include "qgslogger.h"
#include "qgsserversettings.h"
#include <QFile>
QgsMSLayerCache* QgsMSLayerCache::instance()
{
static QgsMSLayerCache *sInstance = nullptr;
if ( !sInstance )
sInstance = new QgsMSLayerCache();
return sInstance;
}
QgsMSLayerCache::QgsMSLayerCache()
{
QObject::connect( &mFileSystemWatcher, SIGNAL( fileChanged( const QString& ) ), this, SLOT( removeProjectFileLayers( const QString& ) ) );
}
QgsMSLayerCache::~QgsMSLayerCache()
{
QgsDebugMsg( "removing all entries" );
Q_FOREACH ( QgsMSLayerCacheEntry entry, mEntries )
{
delete entry.layerPointer;
}
mEntries.clear();
}
void QgsMSLayerCache::setMaxCacheLayers( int maxCacheLayers )
{
mDefaultMaxLayers = maxCacheLayers;
}
void QgsMSLayerCache::insertLayer( const QString& url, const QString& layerName, QgsMapLayer* layer, const QString& configFile, const QList<QString>& tempFiles )
{
QgsMessageLog::logMessage( "Layer cache: insert Layer '" + layerName + "' configFile: " + configFile, QStringLiteral( "Server" ), QgsMessageLog::INFO );
if ( mEntries.size() > qMax( mDefaultMaxLayers, mProjectMaxLayers ) ) //force cache layer examination after 10 inserted layers
{
updateEntries();
}
QPair<QString, QString> urlLayerPair = qMakePair( url, layerName );
QgsMSLayerCacheEntry newEntry;
newEntry.layerPointer = layer;
newEntry.url = url;
newEntry.creationTime = time( nullptr );
newEntry.lastUsedTime = time( nullptr );
newEntry.temporaryFiles = tempFiles;
newEntry.configFile = configFile;
mEntries.insert( urlLayerPair, newEntry );
//update config file map
if ( !configFile.isEmpty() )
{
QHash< QString, int >::const_iterator configIt = mConfigFiles.constFind( configFile );
if ( configIt == mConfigFiles.constEnd() )
{
mConfigFiles.insert( configFile, 1 );
mFileSystemWatcher.addPath( configFile );
}
else
{
mConfigFiles[configFile] = configIt.value() + 1; //increment reference counter
}
}
}
QgsMapLayer* QgsMSLayerCache::searchLayer( const QString& url, const QString& layerName, const QString& configFile )
{
QPair<QString, QString> urlNamePair = qMakePair( url, layerName );
if ( !mEntries.contains( urlNamePair ) )
{
QgsMessageLog::logMessage( "Layer '" + layerName + "' configFile: " + configFile + " not found in layer cache'", QStringLiteral( "Server" ), QgsMessageLog::INFO );
return nullptr;
}
else
{
QList< QgsMSLayerCacheEntry > layers = mEntries.values( urlNamePair );
QList< QgsMSLayerCacheEntry >::iterator layerIt = layers.begin();
for ( ; layerIt != layers.end(); ++layerIt )
{
if ( configFile.isEmpty() || layerIt->configFile == configFile )
{
layerIt->lastUsedTime = time( nullptr );
QgsMessageLog::logMessage( "Layer '" + layerName + "' configFile: " + configFile + " found in layer cache", QStringLiteral( "Server" ), QgsMessageLog::INFO );
return layerIt->layerPointer;
}
}
QgsMessageLog::logMessage( "Layer '" + layerName + "' configFile: " + configFile + " not found in layer cache'", QStringLiteral( "Server" ), QgsMessageLog::INFO );
return nullptr;
}
}
void QgsMSLayerCache::removeProjectFileLayers( const QString& project )
{
QgsMessageLog::logMessage( "Removing cache entries for project file: " + project, QStringLiteral( "Server" ), QgsMessageLog::INFO );
QVector< QPair< QString, QString > > removeEntries;
QVector< QgsMSLayerCacheEntry > removeEntriesValues;
QHash<QPair<QString, QString>, QgsMSLayerCacheEntry>::iterator entryIt = mEntries.begin();
for ( ; entryIt != mEntries.end(); ++entryIt )
{
if ( entryIt.value().configFile == project )
{
removeEntries.push_back( entryIt.key() );
removeEntriesValues.push_back( entryIt.value() );
freeEntryResources( entryIt.value() );
}
}
for ( int i = 0; i < removeEntries.size(); ++i )
{
const QgsMSLayerCacheEntry& removeEntry = removeEntriesValues.at( i );
const QPair< QString, QString > removeKey = removeEntries.at( i );
QgsMessageLog::logMessage( "Removing cache entry for url:" + removeKey.first + " layerName:" + removeKey.second + " project file:" + project, QStringLiteral( "Server" ), QgsMessageLog::INFO );
mEntries.remove( removeKey, removeEntry );
}
}
void QgsMSLayerCache::updateEntries()
{
QgsDebugMsg( "updateEntries" );
int entriesToDelete = mEntries.size() - qMax( mDefaultMaxLayers, mProjectMaxLayers );
if ( entriesToDelete < 1 )
{
return;
}
for ( int i = 0; i < entriesToDelete; ++i )
{
removeLeastUsedEntry();
}
}
void QgsMSLayerCache::removeLeastUsedEntry()
{
if ( mEntries.size() < 1 )
{
return;
}
QHash<QPair<QString, QString>, QgsMSLayerCacheEntry>::iterator it = mEntries.begin();
QHash<QPair<QString, QString>, QgsMSLayerCacheEntry>::iterator lowest_it = it;
time_t lowest_time = it->lastUsedTime;
for ( ; it != mEntries.end(); ++it )
{
if ( it->lastUsedTime < lowest_time )
{
lowest_it = it;
lowest_time = it->lastUsedTime;
}
}
QgsMessageLog::logMessage( "Removing last accessed layer '" + lowest_it.value().layerPointer->name() + "' project file " + lowest_it.value().configFile + " from cache" , QStringLiteral( "Server" ), QgsMessageLog::INFO );
freeEntryResources( *lowest_it );
mEntries.erase( lowest_it );
}
void QgsMSLayerCache::freeEntryResources( QgsMSLayerCacheEntry& entry )
{
// remove layer from QgsProject before delete it
if ( QgsProject::instance()->mapLayer( entry.layerPointer->id() ) )
QgsProject::instance()->removeMapLayer( entry.layerPointer->id() );
delete entry.layerPointer;
//remove the temporary files of a layer
Q_FOREACH ( const QString& file, entry.temporaryFiles )
{
//remove the temporary file
QFile removeFile( file );
if ( !removeFile.remove() )
{
QgsDebugMsg( "could not remove file: " + file );
QgsDebugMsg( removeFile.errorString() );
}
}
//counter
if ( !entry.configFile.isEmpty() )
{
int configFileCount = mConfigFiles[entry.configFile];
if ( configFileCount < 2 )
{
mConfigFiles.remove( entry.configFile );
mFileSystemWatcher.removePath( entry.configFile );
}
else
{
mConfigFiles[entry.configFile] = configFileCount - 1;
}
}
}
void QgsMSLayerCache::logCacheContents() const
{
QgsMessageLog::logMessage( QStringLiteral( "Layer cache contents:" ) , QStringLiteral( "Server" ), QgsMessageLog::INFO );
QHash<QPair<QString, QString>, QgsMSLayerCacheEntry>::const_iterator it = mEntries.constBegin();
for ( ; it != mEntries.constEnd(); ++it )
{
QgsMessageLog::logMessage( "Url: " + it.value().url + " Layer name: " + it.value().layerPointer->name() + " Project: " + it.value().configFile, QStringLiteral( "Server" ), QgsMessageLog::INFO );
}
}
void QgsMSLayerCache::removeProjectLayers( const QString& path )
{
removeProjectFileLayers( path );
}