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akonadi

changerecorder_p.h
00001 /*
00002     Copyright (c) 2007 Volker Krause <vkrause@kde.org>
00003 
00004     This library is free software; you can redistribute it and/or modify it
00005     under the terms of the GNU Library General Public License as published by
00006     the Free Software Foundation; either version 2 of the License, or (at your
00007     option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful, but WITHOUT
00010     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00011     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00012     License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public License
00015     along with this library; see the file COPYING.LIB.  If not, write to the
00016     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00017     02110-1301, USA.
00018 */
00019 
00020 #ifndef AKONADI_CHANGERECORDER_P_H
00021 #define AKONADI_CHANGERECORDER_P_H
00022 
00023 #include "akonadiprivate_export.h"
00024 #include "monitor_p.h"
00025 
00026 class AKONADI_TESTS_EXPORT Akonadi::ChangeRecorderPrivate : public Akonadi::MonitorPrivate
00027 {
00028   public:
00029     ChangeRecorderPrivate( MonitorDependeciesFactory *dependenciesFactory_, ChangeRecorder* parent ) :
00030       MonitorPrivate( dependenciesFactory_, parent ),
00031       settings( 0 ),
00032       enableChangeRecording( true )
00033     {
00034     }
00035 
00036     Q_DECLARE_PUBLIC( ChangeRecorder )
00037     QSettings *settings;
00038     bool enableChangeRecording;
00039 
00040     virtual int pipelineSize() const
00041     {
00042       if ( enableChangeRecording )
00043         return 0; // we fill the pipeline ourselves when using change recording
00044       return MonitorPrivate::pipelineSize();
00045     }
00046 
00047     virtual void slotNotify( const NotificationMessage::List &msgs )
00048     {
00049       Q_Q( ChangeRecorder );
00050       const int oldChanges = pendingNotifications.size();
00051       MonitorPrivate::slotNotify( msgs ); // with change recording disabled this will automatically take care of dispatching notification messages
00052       if ( enableChangeRecording && pendingNotifications.size() != oldChanges ) {
00053         saveNotifications();
00054         emit q->changesAdded();
00055       }
00056     }
00057 
00058     virtual bool emitNotification(const Akonadi::NotificationMessage& msg)
00059     {
00060       const bool someoneWasListening = MonitorPrivate::emitNotification( msg );
00061       if ( !someoneWasListening && enableChangeRecording )
00062         QMetaObject::invokeMethod( q_ptr, "replayNext", Qt::QueuedConnection ); // skip notifications noone was listening to
00063       return someoneWasListening;
00064     }
00065 
00066     void loadNotifications()
00067     {
00068       pendingNotifications.clear();
00069 
00070       const QString changesFileName = settings->fileName() + QLatin1String( "_changes.dat" );
00071 
00078       if ( !QFile::exists( changesFileName ) ) {
00079         QStringList list;
00080         settings->beginGroup( QLatin1String( "ChangeRecorder" ) );
00081         const int size = settings->beginReadArray( QLatin1String( "change" ) );
00082 
00083         for ( int i = 0; i < size; ++i ) {
00084           settings->setArrayIndex( i );
00085           NotificationMessage msg;
00086           msg.setSessionId( settings->value( QLatin1String( "sessionId" ) ).toByteArray() );
00087           msg.setType( (NotificationMessage::Type)settings->value( QLatin1String( "type" ) ).toInt() );
00088           msg.setOperation( (NotificationMessage::Operation)settings->value( QLatin1String( "op" ) ).toInt() );
00089           msg.setUid( settings->value( QLatin1String( "uid" ) ).toLongLong() );
00090           msg.setRemoteId( settings->value( QLatin1String( "rid" ) ).toString() );
00091           msg.setResource( settings->value( QLatin1String( "resource" ) ).toByteArray() );
00092           msg.setParentCollection( settings->value( QLatin1String( "parentCol" ) ).toLongLong() );
00093           msg.setParentDestCollection( settings->value( QLatin1String( "parentDestCol" ) ).toLongLong() );
00094           msg.setMimeType( settings->value( QLatin1String( "mimeType" ) ).toString() );
00095           list = settings->value( QLatin1String( "itemParts" ) ).toStringList();
00096           QSet<QByteArray> itemParts;
00097           Q_FOREACH( const QString &entry, list )
00098             itemParts.insert( entry.toLatin1() );
00099           msg.setItemParts( itemParts );
00100           pendingNotifications << msg;
00101         }
00102 
00103         settings->endArray();
00104 
00105         // save notifications to the new file...
00106         saveNotifications();
00107 
00108         // ...delete the legacy list...
00109         settings->remove( QString() );
00110         settings->endGroup();
00111 
00112         // ...and continue as usually
00113       }
00114 
00115       QFile file( changesFileName );
00116       if ( !file.open( QIODevice::ReadOnly ) )
00117         return;
00118       pendingNotifications = loadFrom( &file );
00119     }
00120 
00121     QQueue<NotificationMessage> loadFrom( QIODevice *device )
00122     {
00123       QDataStream stream( device );
00124       stream.setVersion( QDataStream::Qt_4_6 );
00125 
00126       qulonglong size;
00127       QByteArray sessionId, resource;
00128       int type, operation;
00129       qlonglong uid, parentCollection, parentDestCollection;
00130       QString remoteId, mimeType;
00131       QSet<QByteArray> itemParts;
00132 
00133       QQueue<NotificationMessage> list;
00134 
00135       stream >> size;
00136       for ( qulonglong i = 0; i < size; ++i ) {
00137         NotificationMessage msg;
00138 
00139         stream >> sessionId;
00140         stream >> type;
00141         stream >> operation;
00142         stream >> uid;
00143         stream >> remoteId;
00144         stream >> resource;
00145         stream >> parentCollection;
00146         stream >> parentDestCollection;
00147         stream >> mimeType;
00148         stream >> itemParts;
00149 
00150         msg.setSessionId( sessionId );
00151         msg.setType( static_cast<NotificationMessage::Type>( type ) );
00152         msg.setOperation( static_cast<NotificationMessage::Operation>( operation ) );
00153         msg.setUid( uid );
00154         msg.setRemoteId( remoteId );
00155         msg.setResource( resource );
00156         msg.setParentCollection( parentCollection );
00157         msg.setParentDestCollection( parentDestCollection );
00158         msg.setMimeType( mimeType );
00159         msg.setItemParts( itemParts );
00160         list << msg;
00161       }
00162       return list;
00163     }
00164 
00165     void addToStream( QDataStream &stream, const NotificationMessage &msg )
00166     {
00167         stream << msg.sessionId();
00168         stream << int(msg.type());
00169         stream << int(msg.operation());
00170         stream << qulonglong(msg.uid());
00171         stream << msg.remoteId();
00172         stream << msg.resource();
00173         stream << qulonglong(msg.parentCollection());
00174         stream << qulonglong(msg.parentDestCollection());
00175         stream << msg.mimeType();
00176         stream << msg.itemParts();
00177     }
00178 
00179     void saveNotifications()
00180     {
00181       if ( !settings )
00182         return;
00183 
00184       QFile file( settings->fileName() + QLatin1String( "_changes.dat" ) );
00185       QFileInfo info( file );
00186       if ( !QFile::exists( info.absolutePath() ) ) {
00187         QDir dir;
00188         dir.mkpath( info.absolutePath() );
00189       }
00190       if ( !file.open( QIODevice::WriteOnly ) ) {
00191         qWarning() << "could not save notifications to file " << file.fileName();
00192         return;
00193       }
00194       saveTo(&file);
00195     }
00196 
00197     void saveTo( QIODevice *device )
00198     {
00199 
00200       QDataStream stream( device );
00201       stream.setVersion( QDataStream::Qt_4_6 );
00202 
00203       stream << (qulonglong)(pipeline.count() + pendingNotifications.count());
00204 
00205       for ( int i = 0; i < pipeline.count(); ++i ) {
00206         const NotificationMessage msg = pipeline.at( i );
00207         addToStream( stream, msg );
00208       }
00209 
00210       for ( int i = 0; i < pendingNotifications.count(); ++i ) {
00211         const NotificationMessage msg = pendingNotifications.at( i );
00212         addToStream( stream, msg );
00213       }
00214     }
00215 };
00216 
00217 #endif

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