Add void setReadAhead(uint) to the templates

OTodoAccessSQL use the read ahead value

6 files changed, 44 insertions, 6 deletions

diff --git a/libopie/pim/opimaccessbackend.h b/libopie/pim/opimaccessbackend.h
index 27d3cb8..0bd2723 100644
--- a/libopie/pim/opimaccessbackend.h
+++ b/libopie/pim/opimaccessbackend.h
@@ -1,127 +1,141 @@
 #ifndef OPIE_PIM_ACCESS_BACKEND
 #define OPIE_PIM_ACCESS_BACKEND
 
 #include <qarray.h>
 
 #include <opie/otemplatebase.h>
 #include <opie/opimrecord.h>
 
 
 /**
  * OPimAccessBackend is the base class
  * for all private backends
  * it operates on OPimRecord as the base class
  * and it's responsible for fast manipulating
  * the resource the implementation takes care
  *  of
  */
 template <class T = OPimRecord>
 class OPimAccessBackend {
 public:
     typedef OTemplateBase<T> Frontend;
     OPimAccessBackend();
     virtual ~OPimAccessBackend();
 
     /**
      * load the resource
      */
     virtual bool load() = 0;
 
     /**
      * reload the resource
      */
     virtual bool reload() = 0;
 
     /**
      * save the resource and
      * all it's changes
      */
     virtual bool save() = 0;
 
     /**
      * return an array of
      * all available uids
      */
     virtual QArray<int> allRecords()const = 0;
 
     /**
      * queryByExample for T with the SortOrder
      * sort
      */
     virtual QArray<int> queryByExample( const T& t, int sort ) = 0;
 
     /**
      * find the OPimRecord with uid @param uid
      * returns T and T.isEmpty() if nothing was found
      */
     virtual T find(int uid )const  = 0;
 
     virtual T find(int uid, const QArray<int>& items,
                    uint current, Frontend::CacheDirection )const ;
     /**
      * clear the back end
      */
     virtual void clear() = 0;
 
     /**
      * add T
      */
     virtual bool add( const T& t ) = 0;
 
     /**
      * remove
      */
     virtual bool remove( int uid ) = 0;
 
     /**
      * replace a record with T.uid()
      */
     virtual bool replace( const T& t ) = 0;
 
     /*
      * setTheFrontEnd!!!
      */
     void setFrontend( Frontend* front );
 
+    /**
+     * set the read ahead count
+     */
+    void setReadAhead( uint count );
 protected:
     void cache( const T& t )const;
 
     /**
      * use a prime number here!
      */
     void setSaneCacheSize( int );
 
+    uint readAhead()const;
+
 private:
     Frontend* m_front;
+    uint m_read;
 
 };
 
 template <class T>
 OPimAccessBackend<T>::OPimAccessBackend() {
     m_front = 0l;
 }
 template <class T>
 OPimAccessBackend<T>::~OPimAccessBackend() {
 
 }
 template <class T>
 void OPimAccessBackend<T>::setFrontend( Frontend* fr ) {
     m_front = fr;
 }
 template <class T>
 void OPimAccessBackend<T>::cache( const T& t )const {
     if (m_front )
         m_front->cache( t );
 }
 template <class T>
 void OPimAccessBackend<T>::setSaneCacheSize( int size) {
     if (m_front )
         m_front->setSaneCacheSize( size );
 }
 template <class T>
 T OPimAccessBackend<T>::find( int uid, const QArray<int>&,
                               uint, Frontend::CacheDirection )const {
     return find( uid );
 }
-
+template <class T>
+void OPimAccessBackend<T>::setReadAhead( uint count ) {
+    m_read = count;
+}
+template <class T>
+uint OPimAccessBackend<T>::readAhead()const {
+    return m_read;
+}
 #endif
diff --git a/libopie/pim/opimaccesstemplate.h b/libopie/pim/opimaccesstemplate.h
index 50cb1e4..c5523a8 100644
--- a/libopie/pim/opimaccesstemplate.h
+++ b/libopie/pim/opimaccesstemplate.h
@@ -1,254 +1,259 @@
 #ifndef OPIE_PIM_ACCESS_TEMPLATE_H
 #define OPIE_PIM_ACCESS_TEMPLATE_H
 
 #include <qarray.h>
 
 #include <opie/opimrecord.h>
 #include <opie/opimaccessbackend.h>
 #include <opie/orecordlist.h>
 
 #include "opimcache.h"
 #include "otemplatebase.h"
 
 /**
  * Thats the frontend to our OPIE PIM
  * Library. Either you want to use it's
  * interface or you want to implement
  * your own Access lib
  * Just create a OPimRecord and inherit from
  * the plugins
  */
 
 template <class T = OPimRecord >
 class OPimAccessTemplate : public OTemplateBase<T> {
 public:
     typedef ORecordList<T> List;
     typedef OPimAccessBackend<T> BackEnd;
     typedef OPimCache<T> Cache;
 
     /**
      * c'tor BackEnd
      */
     OPimAccessTemplate( BackEnd* end);
     virtual ~OPimAccessTemplate();
 
     /**
      * load from the backend
      */
     virtual bool load();
 
     /** Reload database.
      * You should execute this function if the external database
      * was changed.
      * This function will load the external database and afterwards
      * rejoin the local changes. Therefore the local database will be set consistent.
      */
     virtual bool reload();
 
     /** Save contacts database.
      * Save is more a "commit". After calling this function, all changes are public available.
      * @return true if successful
      */
     virtual bool save();
 
     /**
      * if the resource was changed externally
      * You should use the signal handling instead of polling possible changes !
      * zecke: Do you implement a signal for otodoaccess ?
      */
     bool wasChangedExternally()const;
 
     /**
      * return a List of records
      * you can iterate over them
      */
     virtual List allRecords()const;
 
     /**
-     * queryByExample. 
+     * queryByExample.
      * @see otodoaccess, ocontactaccess
      */
     virtual List queryByExample( const T& t, int querySettings );
 
     /**
      * find the OPimRecord uid
      */
     virtual T find( int uid )const;
 
     /**
      * read ahead cache find method ;)
      */
     virtual T find( int uid, const QArray<int>&,
                     uint current, CacheDirection dir = Forward )const;
 
     /* invalidate cache here */
     /**
      * clears the backend and invalidates the backend
      */
     virtual void clear() ;
 
     /**
      * add T to the backend
      * @param t The item to add.
      * @return <i>true</i> if added successfully.
      */
     virtual bool add( const T& t ) ;
 
     /* only the uid matters */
     /**
      * remove T from the backend
      * @param t The item to remove
      * @return <i>true</i> if successful.
      */
     virtual bool remove( const T& t );
 
     /**
      * remove the OPimRecord with uid
      * @param uid The ID of the item to remove
      * @return <i>true</i> if successful.
      */
     virtual bool remove( int uid );
 
     /**
      * replace T from backend
      * @param t The item to replace
      * @return <i>true</i> if successful.
      */
     virtual bool replace( const T& t) ;
 
+    void setReadAhead( uint count );
     /**
      * @internal
      */
     void cache( const T& )const;
     void setSaneCacheSize( int );
 protected:
     /**
      * invalidate the cache
      */
     void invalidateCache();
 
     void setBackEnd( BackEnd* end );
     /**
      * returns the backend
      */
     BackEnd* backEnd();
     BackEnd* m_backEnd;
     Cache m_cache;
 
 };
 
 template <class T>
 OPimAccessTemplate<T>::OPimAccessTemplate( BackEnd* end )
     : OTemplateBase<T>(), m_backEnd( end )
 {
     if (end )
         end->setFrontend( this );
 }
 template <class T>
 OPimAccessTemplate<T>::~OPimAccessTemplate() {
     qWarning("~OPimAccessTemplate<T>");
     delete m_backEnd;
 }
 template <class T>
 bool OPimAccessTemplate<T>::load() {
     invalidateCache();
     return m_backEnd->load();
 }
 template <class T>
 bool OPimAccessTemplate<T>::reload() {
 	invalidateCache();  // zecke: I think this should be added (se)
 	return m_backEnd->reload();
 }
 template <class T>
 bool OPimAccessTemplate<T>::save() {
     return m_backEnd->save();
 }
 template <class T>
 OPimAccessTemplate<T>::List OPimAccessTemplate<T>::allRecords()const {
     QArray<int> ints = m_backEnd->allRecords();
     List lis(ints, this );
     return lis;
 }
 template <class T>
 OPimAccessTemplate<T>::List
 OPimAccessTemplate<T>::queryByExample( const T& t, int sortOrder ) {
     QArray<int> ints = m_backEnd->queryByExample( t, sortOrder );
 
     List lis(ints, this );
     return lis;
 }
 template <class T>
 T OPimAccessTemplate<T>::find( int uid ) const{
     T t = m_backEnd->find( uid );
     cache( t );
     return t;
 }
 template <class T>
 T OPimAccessTemplate<T>::find( int uid, const QArray<int>& ar,
                                uint current, CacheDirection dir )const {
     /*
      * better do T.isEmpty()
      * after a find this way we would
      * avoid two finds in QCache...
      */
     // qWarning("find it now %d", uid );
     if (m_cache.contains( uid ) ) {
         return m_cache.find( uid );
     }
 
     T t = m_backEnd->find( uid, ar, current, dir );
     cache( t );
     return t;
 }
 template <class T>
 void OPimAccessTemplate<T>::clear() {
     invalidateCache();
     m_backEnd->clear();
 }
 template <class T>
 bool OPimAccessTemplate<T>::add( const T& t ) {
     cache( t );
     return m_backEnd->add( t );
 }
 template <class T>
 bool OPimAccessTemplate<T>::remove( const T& t ) {
     return remove( t.uid() );
 }
 template <class T>
 bool OPimAccessTemplate<T>::remove( int uid ) {
     m_cache.remove( uid );
     return m_backEnd->remove( uid );
 }
 template <class T>
 bool OPimAccessTemplate<T>::replace( const T& t ) {
     m_cache.replace( t );
     return m_backEnd->replace( t );
 }
 template <class T>
 void OPimAccessTemplate<T>::invalidateCache() {
     m_cache.invalidate();
 }
 template <class T>
 OPimAccessTemplate<T>::BackEnd* OPimAccessTemplate<T>::backEnd() {
     return m_backEnd;
 }
 template <class T>
 bool OPimAccessTemplate<T>::wasChangedExternally()const {
     return false;
 }
 template <class T>
 void OPimAccessTemplate<T>::setBackEnd( BackEnd* end ) {
     m_backEnd = end;
     if (m_backEnd )
         m_backEnd->setFrontend( this );
 }
 template <class T>
 void OPimAccessTemplate<T>::cache( const T& t ) const{
     /* hacky we need to work around the const*/
     ((OPimAccessTemplate<T>*)this)->m_cache.add( t );
 }
 template <class T>
 void OPimAccessTemplate<T>::setSaneCacheSize( int size ) {
     m_cache.setSize( size );
 }
+template <class T>
+void OPimAccessTemplate<T>::setReadAhead( uint count ) {
+    m_backEnd->setReadAhead( count );
+}
 #endif
diff --git a/libopie/pim/otodoaccesssql.cpp b/libopie/pim/otodoaccesssql.cpp
index 9ef6b7c..8c2ea3a 100644
--- a/libopie/pim/otodoaccesssql.cpp
+++ b/libopie/pim/otodoaccesssql.cpp
@@ -97,387 +97,387 @@ namespace {
     class OverDueQuery : public OSQLQuery {
     public:
         OverDueQuery();
         ~OverDueQuery();
         QString query()const;
     };
     class EffQuery : public OSQLQuery {
     public:
         EffQuery( const QDate&, const QDate&, bool inc );
         ~EffQuery();
         QString query()const;
     private:
         QString with()const;
         QString out()const;
         QDate m_start;
         QDate m_end;
         bool m_inc :1;
     };
 
 
     CreateQuery::CreateQuery() : OSQLQuery() {}
     CreateQuery::~CreateQuery() {}
     QString CreateQuery::query()const {
         QString qu;
         qu += "create table todolist( uid, categories, completed, progress, ";
         qu += "summary, DueDate, priority, description )";
         return qu;
     }
 
     LoadQuery::LoadQuery() : OSQLQuery() {}
     LoadQuery::~LoadQuery() {}
     QString LoadQuery::query()const {
         QString qu;
         qu += "select distinct uid from todolist";
 
         return qu;
     }
 
     InsertQuery::InsertQuery( const OTodo& todo )
         : OSQLQuery(), m_todo( todo ) {
     }
     InsertQuery::~InsertQuery() {
     }
     /*
      * converts from a OTodo to a query
      * we leave out X-Ref + Alarms
      */
     QString InsertQuery::query()const{
 
         int year, month, day;
         year = month = day = 0;
         if (m_todo.hasDueDate() ) {
             QDate date = m_todo.dueDate();
             year = date.year();
             month = date.month();
             day = date.day();
         }
         QString qu;
         qu  = "insert into todolist VALUES(" +  QString::number( m_todo.uid() ) + ",'" + m_todo.idsToString( m_todo.categories() ) + "',";
         qu += QString::number( m_todo.isCompleted() ) + "," + QString::number( m_todo.progress() ) + ",";
         qu += "'"+m_todo.summary()+"','"+QString::number(year)+"-"+QString::number(month)+"-"+QString::number(day)+"',";
         qu += QString::number(m_todo.priority() ) +",'" + m_todo.description() + "')";
 
         qWarning("add %s", qu.latin1() );
         return qu;
     }
 
     RemoveQuery::RemoveQuery(int uid )
         : OSQLQuery(), m_uid( uid ) {}
     RemoveQuery::~RemoveQuery() {}
     QString RemoveQuery::query()const {
         QString qu = "DELETE from todolist where uid = " + QString::number(m_uid);
         return qu;
     }
 
 
     ClearQuery::ClearQuery()
         : OSQLQuery() {}
     ClearQuery::~ClearQuery() {}
     QString ClearQuery::query()const {
         QString qu = "drop table todolist";
         return qu;
     }
     FindQuery::FindQuery(int uid)
         : OSQLQuery(), m_uid(uid ) {
     }
     FindQuery::FindQuery(const QArray<int>& ints)
         : OSQLQuery(), m_uids(ints){
     }
     FindQuery::~FindQuery() {
     }
     QString FindQuery::query()const{
         if (m_uids.count() == 0 )
             return single();
         else
             return multi();
     }
     QString FindQuery::single()const{
         QString qu = "select uid, categories, completed, progress, summary, ";
         qu += "DueDate, priority, description from todolist where uid = " + QString::number(m_uid);
         return qu;
     }
     QString FindQuery::multi()const {
         QString qu = "select uid, categories, completed, progress, summary, ";
         qu += "DueDate, priority, description from todolist where ";
         for (uint i = 0; i < m_uids.count(); i++ ) {
             qu += " UID = " + QString::number( m_uids[i] ) + " OR";
         }
         qu.remove( qu.length()-2, 2 );
         return qu;
     }
 
     OverDueQuery::OverDueQuery(): OSQLQuery() {}
     OverDueQuery::~OverDueQuery() {}
     QString OverDueQuery::query()const {
         QDate date = QDate::currentDate();
         QString str;
         str = QString("select uid from todolist where DueDate ='%1-%2-%3'").arg(date.year() ).arg(date.month() ).arg(date.day() );
 
         return str;
     }
 
 
     EffQuery::EffQuery( const QDate& start, const QDate& end, bool inc )
         : OSQLQuery(), m_start( start ), m_end( end ),m_inc(inc) {}
     EffQuery::~EffQuery() {}
     QString EffQuery::query()const {
         return m_inc ? with() : out();
     }
     QString EffQuery::with()const {
         QString str;
         str = QString("select uid from todolist where ( DueDate >= '%1-%2-%3' AND DueDate <= '%4-%5-%6' ) OR DueDate = '0-0-0' ")
             .arg( m_start.year() ).arg( m_start.month() ).arg( m_start.day() )
             .arg( m_end  .year() ).arg( m_end  .month() ).arg( m_end  .day() );
         return str;
     }
     QString EffQuery::out()const {
         QString str;
         str = QString("select uid from todolist where DueDate >= '%1-%2-%3' AND  DueDate <= '%4-%5-%6'")
             .arg(m_start.year() ).arg(m_start.month() ).arg( m_start.day() )
             .arg(m_end.  year() ).arg(m_end.  month() ).arg(m_end.day() );
 
         return str;
     }
 };
 
 OTodoAccessBackendSQL::OTodoAccessBackendSQL( const QString& file )
     : OTodoAccessBackend(), m_dict(15), m_dirty(true)
 {
     QString fi = file;
     if ( fi.isEmpty() )
         fi = Global::applicationFileName( "todolist", "todolist.db" );
     OSQLManager man;
     m_driver = man.standard();
     m_driver->setUrl(fi);
     fillDict();
 }
 
 OTodoAccessBackendSQL::~OTodoAccessBackendSQL(){
 }
 bool OTodoAccessBackendSQL::load(){
     if (!m_driver->open() )
         return false;
 
     CreateQuery creat;
     OSQLResult res = m_driver->query(&creat );
 
     m_dirty = true;
     return true;
 }
 bool OTodoAccessBackendSQL::reload(){
     return load();
 }
 
 bool OTodoAccessBackendSQL::save(){
     return m_driver->close();
 }
 QArray<int> OTodoAccessBackendSQL::allRecords()const {
     if (m_dirty )
         update();
 
     return m_uids;
 }
 QArray<int> OTodoAccessBackendSQL::queryByExample( const OTodo& , int  ){
     QArray<int> ints(0);
     return ints;
 }
 OTodo OTodoAccessBackendSQL::find(int uid ) const{
     FindQuery query( uid );
     return todo( m_driver->query(&query) );
 
 }
-#define CACHE 32
 OTodo OTodoAccessBackendSQL::find( int uid, const QArray<int>& ints,
                                    uint cur, Frontend::CacheDirection dir ) const{
+    int CACHE = readAhead();
     qWarning("searching for %d", uid );
     QArray<int> search( CACHE );
     uint size =0;
     OTodo to;
 
     // we try to cache CACHE items
     switch( dir ) {
         /* forward */
     case 0:
         for (uint i = cur; i < ints.count() && size < CACHE; i++ ) {
             qWarning("size %d %d", size,  ints[i] );
             search[size] = ints[i];
             size++;
         }
         break;
         /* reverse */
     case 1:
         for (uint i = cur; i != 0 && size <  CACHE; i-- ) {
             search[size] = ints[i];
             size++;
         }
         break;
     }
     search.resize( size );
     FindQuery query( search );
     OSQLResult res = m_driver->query( &query  );
     if ( res.state() != OSQLResult::Success )
         return to;
 
     return todo( res );
 }
 void OTodoAccessBackendSQL::clear() {
     ClearQuery cle;
     OSQLResult res = m_driver->query( &cle );
     CreateQuery qu;
     res = m_driver->query(&qu);
 }
 bool OTodoAccessBackendSQL::add( const OTodo& t) {
     InsertQuery ins( t );
     OSQLResult res = m_driver->query( &ins );
 
     if ( res.state() == OSQLResult::Failure )
         return false;
     int c = m_uids.count();
     m_uids.resize( c+1 );
     m_uids[c] = t.uid();
 
     return true;
 }
 bool OTodoAccessBackendSQL::remove( int uid ) {
     RemoveQuery rem( uid );
     OSQLResult res = m_driver->query(&rem );
 
     if ( res.state() == OSQLResult::Failure )
         return false;
 
     m_dirty = true;
     return true;
 }
 /*
  * FIXME better set query
  * but we need the cache for that
  * now we remove
  */
 bool OTodoAccessBackendSQL::replace( const OTodo& t) {
     remove( t.uid() );
     bool b= add(t);
     m_dirty = false; // we changed some stuff but the UID stayed the same
     return b;
 }
 QArray<int> OTodoAccessBackendSQL::overDue() {
     OverDueQuery qu;
     return uids( m_driver->query(&qu ) );
 }
 QArray<int> OTodoAccessBackendSQL::effectiveToDos( const QDate& s,
                                                    const QDate& t,
                                                    bool u) {
     EffQuery ef(s, t, u );
     return uids (m_driver->query(&ef) );
 }
 /*
  *
  */
 QArray<int> OTodoAccessBackendSQL::sorted( bool asc, int sortOrder,
                                            int sortFilter, int cat ) {
     qWarning("sorted %d, %d", asc, sortOrder );
     QString query;
     query = "select uid from todolist WHERE ";
 
     /*
      * Sort Filter stuff
      * not that straight forward
      *
      */
     /* Category */
     if ( sortFilter & 1 ) {
         QString str;
         if (cat != 0 ) str = QString::number( cat );
         query += " categories like '%" +str+"%' AND";
     }
     /* Show only overdue */
     if ( sortFilter & 2 ) {
         QDate date = QDate::currentDate();
         QString due;
         QString base;
         base = QString("DueDate <= '%1-%2-%3' AND completed = 0").arg( date.year() ).arg( date.month() ).arg( date.day() );
         query += " " + base + " AND";
     }
     /* not show completed */
     if ( sortFilter & 4 ) {
         query += " completed = 0 AND";
     }else{
        query += " ( completed = 1 OR  completed = 0) AND";
     }
     /* srtip the end */
     query = query.remove( query.length()-3, 3 );
 
 
     /*
      * sort order stuff
      * quite straight forward
      */
     query += "ORDER BY ";
     switch( sortOrder ) {
         /* completed */
     case 0:
         query += "completed";
         break;
     case 1:
         query += "priority";
         break;
     case 2:
         query += "description";
         break;
     case 3:
         query += "DueDate";
         break;
     }
 
     if ( !asc ) {
         qWarning("not ascending!");
         query += " DESC";
     }
 
     qWarning( query );
     OSQLRawQuery raw(query );
     return uids( m_driver->query(&raw) );
 }
 bool OTodoAccessBackendSQL::date( QDate& da, const QString& str ) const{
     if ( str == "0-0-0" )
         return false;
     else{
         int day, year, month;
         QStringList list = QStringList::split("-", str );
         year = list[0].toInt();
         month = list[1].toInt();
         day = list[2].toInt();
         da.setYMD( year, month, day );
         return true;
     }
 }
 OTodo OTodoAccessBackendSQL::todo( const OSQLResult& res) const{
     if ( res.state() == OSQLResult::Failure ) {
         OTodo to;
         return to;
     }
 
     OSQLResultItem::ValueList list = res.results();
     OSQLResultItem::ValueList::Iterator it = list.begin();
     qWarning("todo1");
     OTodo to = todo( (*it) );
     cache( to );
     ++it;
 
     for ( ; it != list.end(); ++it ) {
         qWarning("caching");
         cache( todo( (*it) ) );
     }
     return to;
 }
 OTodo OTodoAccessBackendSQL::todo( OSQLResultItem& item )const {
     qWarning("todo");
     bool has = false; QDate da = QDate::currentDate();
     has = date( da, item.data("DueDate") );
     QStringList cats = QStringList::split(";", item.data("categories") );
 
     OTodo to( (bool)item.data("completed").toInt(), item.data("priority").toInt(),
               cats, item.data("summary"), item.data("description"),
               item.data("progress").toUShort(), has, da,
               item.data("uid").toInt() );
     return to;
 }
diff --git a/libopie2/opiepim/backend/opimaccessbackend.h b/libopie2/opiepim/backend/opimaccessbackend.h
index 27d3cb8..0bd2723 100644
--- a/libopie2/opiepim/backend/opimaccessbackend.h
+++ b/libopie2/opiepim/backend/opimaccessbackend.h
@@ -1,127 +1,141 @@
 #ifndef OPIE_PIM_ACCESS_BACKEND
 #define OPIE_PIM_ACCESS_BACKEND
 
 #include <qarray.h>
 
 #include <opie/otemplatebase.h>
 #include <opie/opimrecord.h>
 
 
 /**
  * OPimAccessBackend is the base class
  * for all private backends
  * it operates on OPimRecord as the base class
  * and it's responsible for fast manipulating
  * the resource the implementation takes care
  *  of
  */
 template <class T = OPimRecord>
 class OPimAccessBackend {
 public:
     typedef OTemplateBase<T> Frontend;
     OPimAccessBackend();
     virtual ~OPimAccessBackend();
 
     /**
      * load the resource
      */
     virtual bool load() = 0;
 
     /**
      * reload the resource
      */
     virtual bool reload() = 0;
 
     /**
      * save the resource and
      * all it's changes
      */
     virtual bool save() = 0;
 
     /**
      * return an array of
      * all available uids
      */
     virtual QArray<int> allRecords()const = 0;
 
     /**
      * queryByExample for T with the SortOrder
      * sort
      */
     virtual QArray<int> queryByExample( const T& t, int sort ) = 0;
 
     /**
      * find the OPimRecord with uid @param uid
      * returns T and T.isEmpty() if nothing was found
      */
     virtual T find(int uid )const  = 0;
 
     virtual T find(int uid, const QArray<int>& items,
                    uint current, Frontend::CacheDirection )const ;
     /**
      * clear the back end
      */
     virtual void clear() = 0;
 
     /**
      * add T
      */
     virtual bool add( const T& t ) = 0;
 
     /**
      * remove
      */
     virtual bool remove( int uid ) = 0;
 
     /**
      * replace a record with T.uid()
      */
     virtual bool replace( const T& t ) = 0;
 
     /*
      * setTheFrontEnd!!!
      */
     void setFrontend( Frontend* front );
 
+    /**
+     * set the read ahead count
+     */
+    void setReadAhead( uint count );
 protected:
     void cache( const T& t )const;
 
     /**
      * use a prime number here!
      */
     void setSaneCacheSize( int );
 
+    uint readAhead()const;
+
 private:
     Frontend* m_front;
+    uint m_read;
 
 };
 
 template <class T>
 OPimAccessBackend<T>::OPimAccessBackend() {
     m_front = 0l;
 }
 template <class T>
 OPimAccessBackend<T>::~OPimAccessBackend() {
 
 }
 template <class T>
 void OPimAccessBackend<T>::setFrontend( Frontend* fr ) {
     m_front = fr;
 }
 template <class T>
 void OPimAccessBackend<T>::cache( const T& t )const {
     if (m_front )
         m_front->cache( t );
 }
 template <class T>
 void OPimAccessBackend<T>::setSaneCacheSize( int size) {
     if (m_front )
         m_front->setSaneCacheSize( size );
 }
 template <class T>
 T OPimAccessBackend<T>::find( int uid, const QArray<int>&,
                               uint, Frontend::CacheDirection )const {
     return find( uid );
 }
-
+template <class T>
+void OPimAccessBackend<T>::setReadAhead( uint count ) {
+    m_read = count;
+}
+template <class T>
+uint OPimAccessBackend<T>::readAhead()const {
+    return m_read;
+}
 #endif
diff --git a/libopie2/opiepim/backend/otodoaccesssql.cpp b/libopie2/opiepim/backend/otodoaccesssql.cpp
index 9ef6b7c..8c2ea3a 100644
--- a/libopie2/opiepim/backend/otodoaccesssql.cpp
+++ b/libopie2/opiepim/backend/otodoaccesssql.cpp
@@ -97,387 +97,387 @@ namespace {
     class OverDueQuery : public OSQLQuery {
     public:
         OverDueQuery();
         ~OverDueQuery();
         QString query()const;
     };
     class EffQuery : public OSQLQuery {
     public:
         EffQuery( const QDate&, const QDate&, bool inc );
         ~EffQuery();
         QString query()const;
     private:
         QString with()const;
         QString out()const;
         QDate m_start;
         QDate m_end;
         bool m_inc :1;
     };
 
 
     CreateQuery::CreateQuery() : OSQLQuery() {}
     CreateQuery::~CreateQuery() {}
     QString CreateQuery::query()const {
         QString qu;
         qu += "create table todolist( uid, categories, completed, progress, ";
         qu += "summary, DueDate, priority, description )";
         return qu;
     }
 
     LoadQuery::LoadQuery() : OSQLQuery() {}
     LoadQuery::~LoadQuery() {}
     QString LoadQuery::query()const {
         QString qu;
         qu += "select distinct uid from todolist";
 
         return qu;
     }
 
     InsertQuery::InsertQuery( const OTodo& todo )
         : OSQLQuery(), m_todo( todo ) {
     }
     InsertQuery::~InsertQuery() {
     }
     /*
      * converts from a OTodo to a query
      * we leave out X-Ref + Alarms
      */
     QString InsertQuery::query()const{
 
         int year, month, day;
         year = month = day = 0;
         if (m_todo.hasDueDate() ) {
             QDate date = m_todo.dueDate();
             year = date.year();
             month = date.month();
             day = date.day();
         }
         QString qu;
         qu  = "insert into todolist VALUES(" +  QString::number( m_todo.uid() ) + ",'" + m_todo.idsToString( m_todo.categories() ) + "',";
         qu += QString::number( m_todo.isCompleted() ) + "," + QString::number( m_todo.progress() ) + ",";
         qu += "'"+m_todo.summary()+"','"+QString::number(year)+"-"+QString::number(month)+"-"+QString::number(day)+"',";
         qu += QString::number(m_todo.priority() ) +",'" + m_todo.description() + "')";
 
         qWarning("add %s", qu.latin1() );
         return qu;
     }
 
     RemoveQuery::RemoveQuery(int uid )
         : OSQLQuery(), m_uid( uid ) {}
     RemoveQuery::~RemoveQuery() {}
     QString RemoveQuery::query()const {
         QString qu = "DELETE from todolist where uid = " + QString::number(m_uid);
         return qu;
     }
 
 
     ClearQuery::ClearQuery()
         : OSQLQuery() {}
     ClearQuery::~ClearQuery() {}
     QString ClearQuery::query()const {
         QString qu = "drop table todolist";
         return qu;
     }
     FindQuery::FindQuery(int uid)
         : OSQLQuery(), m_uid(uid ) {
     }
     FindQuery::FindQuery(const QArray<int>& ints)
         : OSQLQuery(), m_uids(ints){
     }
     FindQuery::~FindQuery() {
     }
     QString FindQuery::query()const{
         if (m_uids.count() == 0 )
             return single();
         else
             return multi();
     }
     QString FindQuery::single()const{
         QString qu = "select uid, categories, completed, progress, summary, ";
         qu += "DueDate, priority, description from todolist where uid = " + QString::number(m_uid);
         return qu;
     }
     QString FindQuery::multi()const {
         QString qu = "select uid, categories, completed, progress, summary, ";
         qu += "DueDate, priority, description from todolist where ";
         for (uint i = 0; i < m_uids.count(); i++ ) {
             qu += " UID = " + QString::number( m_uids[i] ) + " OR";
         }
         qu.remove( qu.length()-2, 2 );
         return qu;
     }
 
     OverDueQuery::OverDueQuery(): OSQLQuery() {}
     OverDueQuery::~OverDueQuery() {}
     QString OverDueQuery::query()const {
         QDate date = QDate::currentDate();
         QString str;
         str = QString("select uid from todolist where DueDate ='%1-%2-%3'").arg(date.year() ).arg(date.month() ).arg(date.day() );
 
         return str;
     }
 
 
     EffQuery::EffQuery( const QDate& start, const QDate& end, bool inc )
         : OSQLQuery(), m_start( start ), m_end( end ),m_inc(inc) {}
     EffQuery::~EffQuery() {}
     QString EffQuery::query()const {
         return m_inc ? with() : out();
     }
     QString EffQuery::with()const {
         QString str;
         str = QString("select uid from todolist where ( DueDate >= '%1-%2-%3' AND DueDate <= '%4-%5-%6' ) OR DueDate = '0-0-0' ")
             .arg( m_start.year() ).arg( m_start.month() ).arg( m_start.day() )
             .arg( m_end  .year() ).arg( m_end  .month() ).arg( m_end  .day() );
         return str;
     }
     QString EffQuery::out()const {
         QString str;
         str = QString("select uid from todolist where DueDate >= '%1-%2-%3' AND  DueDate <= '%4-%5-%6'")
             .arg(m_start.year() ).arg(m_start.month() ).arg( m_start.day() )
             .arg(m_end.  year() ).arg(m_end.  month() ).arg(m_end.day() );
 
         return str;
     }
 };
 
 OTodoAccessBackendSQL::OTodoAccessBackendSQL( const QString& file )
     : OTodoAccessBackend(), m_dict(15), m_dirty(true)
 {
     QString fi = file;
     if ( fi.isEmpty() )
         fi = Global::applicationFileName( "todolist", "todolist.db" );
     OSQLManager man;
     m_driver = man.standard();
     m_driver->setUrl(fi);
     fillDict();
 }
 
 OTodoAccessBackendSQL::~OTodoAccessBackendSQL(){
 }
 bool OTodoAccessBackendSQL::load(){
     if (!m_driver->open() )
         return false;
 
     CreateQuery creat;
     OSQLResult res = m_driver->query(&creat );
 
     m_dirty = true;
     return true;
 }
 bool OTodoAccessBackendSQL::reload(){
     return load();
 }
 
 bool OTodoAccessBackendSQL::save(){
     return m_driver->close();
 }
 QArray<int> OTodoAccessBackendSQL::allRecords()const {
     if (m_dirty )
         update();
 
     return m_uids;
 }
 QArray<int> OTodoAccessBackendSQL::queryByExample( const OTodo& , int  ){
     QArray<int> ints(0);
     return ints;
 }
 OTodo OTodoAccessBackendSQL::find(int uid ) const{
     FindQuery query( uid );
     return todo( m_driver->query(&query) );
 
 }
-#define CACHE 32
 OTodo OTodoAccessBackendSQL::find( int uid, const QArray<int>& ints,
                                    uint cur, Frontend::CacheDirection dir ) const{
+    int CACHE = readAhead();
     qWarning("searching for %d", uid );
     QArray<int> search( CACHE );
     uint size =0;
     OTodo to;
 
     // we try to cache CACHE items
     switch( dir ) {
         /* forward */
     case 0:
         for (uint i = cur; i < ints.count() && size < CACHE; i++ ) {
             qWarning("size %d %d", size,  ints[i] );
             search[size] = ints[i];
             size++;
         }
         break;
         /* reverse */
     case 1:
         for (uint i = cur; i != 0 && size <  CACHE; i-- ) {
             search[size] = ints[i];
             size++;
         }
         break;
     }
     search.resize( size );
     FindQuery query( search );
     OSQLResult res = m_driver->query( &query  );
     if ( res.state() != OSQLResult::Success )
         return to;
 
     return todo( res );
 }
 void OTodoAccessBackendSQL::clear() {
     ClearQuery cle;
     OSQLResult res = m_driver->query( &cle );
     CreateQuery qu;
     res = m_driver->query(&qu);
 }
 bool OTodoAccessBackendSQL::add( const OTodo& t) {
     InsertQuery ins( t );
     OSQLResult res = m_driver->query( &ins );
 
     if ( res.state() == OSQLResult::Failure )
         return false;
     int c = m_uids.count();
     m_uids.resize( c+1 );
     m_uids[c] = t.uid();
 
     return true;
 }
 bool OTodoAccessBackendSQL::remove( int uid ) {
     RemoveQuery rem( uid );
     OSQLResult res = m_driver->query(&rem );
 
     if ( res.state() == OSQLResult::Failure )
         return false;
 
     m_dirty = true;
     return true;
 }
 /*
  * FIXME better set query
  * but we need the cache for that
  * now we remove
  */
 bool OTodoAccessBackendSQL::replace( const OTodo& t) {
     remove( t.uid() );
     bool b= add(t);
     m_dirty = false; // we changed some stuff but the UID stayed the same
     return b;
 }
 QArray<int> OTodoAccessBackendSQL::overDue() {
     OverDueQuery qu;
     return uids( m_driver->query(&qu ) );
 }
 QArray<int> OTodoAccessBackendSQL::effectiveToDos( const QDate& s,
                                                    const QDate& t,
                                                    bool u) {
     EffQuery ef(s, t, u );
     return uids (m_driver->query(&ef) );
 }
 /*
  *
  */
 QArray<int> OTodoAccessBackendSQL::sorted( bool asc, int sortOrder,
                                            int sortFilter, int cat ) {
     qWarning("sorted %d, %d", asc, sortOrder );
     QString query;
     query = "select uid from todolist WHERE ";
 
     /*
      * Sort Filter stuff
      * not that straight forward
      *
      */
     /* Category */
     if ( sortFilter & 1 ) {
         QString str;
         if (cat != 0 ) str = QString::number( cat );
         query += " categories like '%" +str+"%' AND";
     }
     /* Show only overdue */
     if ( sortFilter & 2 ) {
         QDate date = QDate::currentDate();
         QString due;
         QString base;
         base = QString("DueDate <= '%1-%2-%3' AND completed = 0").arg( date.year() ).arg( date.month() ).arg( date.day() );
         query += " " + base + " AND";
     }
     /* not show completed */
     if ( sortFilter & 4 ) {
         query += " completed = 0 AND";
     }else{
        query += " ( completed = 1 OR  completed = 0) AND";
     }
     /* srtip the end */
     query = query.remove( query.length()-3, 3 );
 
 
     /*
      * sort order stuff
      * quite straight forward
      */
     query += "ORDER BY ";
     switch( sortOrder ) {
         /* completed */
     case 0:
         query += "completed";
         break;
     case 1:
         query += "priority";
         break;
     case 2:
         query += "description";
         break;
     case 3:
         query += "DueDate";
         break;
     }
 
     if ( !asc ) {
         qWarning("not ascending!");
         query += " DESC";
     }
 
     qWarning( query );
     OSQLRawQuery raw(query );
     return uids( m_driver->query(&raw) );
 }
 bool OTodoAccessBackendSQL::date( QDate& da, const QString& str ) const{
     if ( str == "0-0-0" )
         return false;
     else{
         int day, year, month;
         QStringList list = QStringList::split("-", str );
         year = list[0].toInt();
         month = list[1].toInt();
         day = list[2].toInt();
         da.setYMD( year, month, day );
         return true;
     }
 }
 OTodo OTodoAccessBackendSQL::todo( const OSQLResult& res) const{
     if ( res.state() == OSQLResult::Failure ) {
         OTodo to;
         return to;
     }
 
     OSQLResultItem::ValueList list = res.results();
     OSQLResultItem::ValueList::Iterator it = list.begin();
     qWarning("todo1");
     OTodo to = todo( (*it) );
     cache( to );
     ++it;
 
     for ( ; it != list.end(); ++it ) {
         qWarning("caching");
         cache( todo( (*it) ) );
     }
     return to;
 }
 OTodo OTodoAccessBackendSQL::todo( OSQLResultItem& item )const {
     qWarning("todo");
     bool has = false; QDate da = QDate::currentDate();
     has = date( da, item.data("DueDate") );
     QStringList cats = QStringList::split(";", item.data("categories") );
 
     OTodo to( (bool)item.data("completed").toInt(), item.data("priority").toInt(),
               cats, item.data("summary"), item.data("description"),
               item.data("progress").toUShort(), has, da,
               item.data("uid").toInt() );
     return to;
 }
diff --git a/libopie2/opiepim/core/opimaccesstemplate.h b/libopie2/opiepim/core/opimaccesstemplate.h
index 50cb1e4..c5523a8 100644
--- a/libopie2/opiepim/core/opimaccesstemplate.h
+++ b/libopie2/opiepim/core/opimaccesstemplate.h
@@ -1,254 +1,259 @@
 #ifndef OPIE_PIM_ACCESS_TEMPLATE_H
 #define OPIE_PIM_ACCESS_TEMPLATE_H
 
 #include <qarray.h>
 
 #include <opie/opimrecord.h>
 #include <opie/opimaccessbackend.h>
 #include <opie/orecordlist.h>
 
 #include "opimcache.h"
 #include "otemplatebase.h"
 
 /**
  * Thats the frontend to our OPIE PIM
  * Library. Either you want to use it's
  * interface or you want to implement
  * your own Access lib
  * Just create a OPimRecord and inherit from
  * the plugins
  */
 
 template <class T = OPimRecord >
 class OPimAccessTemplate : public OTemplateBase<T> {
 public:
     typedef ORecordList<T> List;
     typedef OPimAccessBackend<T> BackEnd;
     typedef OPimCache<T> Cache;
 
     /**
      * c'tor BackEnd
      */
     OPimAccessTemplate( BackEnd* end);
     virtual ~OPimAccessTemplate();
 
     /**
      * load from the backend
      */
     virtual bool load();
 
     /** Reload database.
      * You should execute this function if the external database
      * was changed.
      * This function will load the external database and afterwards
      * rejoin the local changes. Therefore the local database will be set consistent.
      */
     virtual bool reload();
 
     /** Save contacts database.
      * Save is more a "commit". After calling this function, all changes are public available.
      * @return true if successful
      */
     virtual bool save();
 
     /**
      * if the resource was changed externally
      * You should use the signal handling instead of polling possible changes !
      * zecke: Do you implement a signal for otodoaccess ?
      */
     bool wasChangedExternally()const;
 
     /**
      * return a List of records
      * you can iterate over them
      */
     virtual List allRecords()const;
 
     /**
-     * queryByExample. 
+     * queryByExample.
      * @see otodoaccess, ocontactaccess
      */
     virtual List queryByExample( const T& t, int querySettings );
 
     /**
      * find the OPimRecord uid
      */
     virtual T find( int uid )const;
 
     /**
      * read ahead cache find method ;)
      */
     virtual T find( int uid, const QArray<int>&,
                     uint current, CacheDirection dir = Forward )const;
 
     /* invalidate cache here */
     /**
      * clears the backend and invalidates the backend
      */
     virtual void clear() ;
 
     /**
      * add T to the backend
      * @param t The item to add.
      * @return <i>true</i> if added successfully.
      */
     virtual bool add( const T& t ) ;
 
     /* only the uid matters */
     /**
      * remove T from the backend
      * @param t The item to remove
      * @return <i>true</i> if successful.
      */
     virtual bool remove( const T& t );
 
     /**
      * remove the OPimRecord with uid
      * @param uid The ID of the item to remove
      * @return <i>true</i> if successful.
      */
     virtual bool remove( int uid );
 
     /**
      * replace T from backend
      * @param t The item to replace
      * @return <i>true</i> if successful.
      */
     virtual bool replace( const T& t) ;
 
+    void setReadAhead( uint count );
     /**
      * @internal
      */
     void cache( const T& )const;
     void setSaneCacheSize( int );
 protected:
     /**
      * invalidate the cache
      */
     void invalidateCache();
 
     void setBackEnd( BackEnd* end );
     /**
      * returns the backend
      */
     BackEnd* backEnd();
     BackEnd* m_backEnd;
     Cache m_cache;
 
 };
 
 template <class T>
 OPimAccessTemplate<T>::OPimAccessTemplate( BackEnd* end )
     : OTemplateBase<T>(), m_backEnd( end )
 {
     if (end )
         end->setFrontend( this );
 }
 template <class T>
 OPimAccessTemplate<T>::~OPimAccessTemplate() {
     qWarning("~OPimAccessTemplate<T>");
     delete m_backEnd;
 }
 template <class T>
 bool OPimAccessTemplate<T>::load() {
     invalidateCache();
     return m_backEnd->load();
 }
 template <class T>
 bool OPimAccessTemplate<T>::reload() {
 	invalidateCache();  // zecke: I think this should be added (se)
 	return m_backEnd->reload();
 }
 template <class T>
 bool OPimAccessTemplate<T>::save() {
     return m_backEnd->save();
 }
 template <class T>
 OPimAccessTemplate<T>::List OPimAccessTemplate<T>::allRecords()const {
     QArray<int> ints = m_backEnd->allRecords();
     List lis(ints, this );
     return lis;
 }
 template <class T>
 OPimAccessTemplate<T>::List
 OPimAccessTemplate<T>::queryByExample( const T& t, int sortOrder ) {
     QArray<int> ints = m_backEnd->queryByExample( t, sortOrder );
 
     List lis(ints, this );
     return lis;
 }
 template <class T>
 T OPimAccessTemplate<T>::find( int uid ) const{
     T t = m_backEnd->find( uid );
     cache( t );
     return t;
 }
 template <class T>
 T OPimAccessTemplate<T>::find( int uid, const QArray<int>& ar,
                                uint current, CacheDirection dir )const {
     /*
      * better do T.isEmpty()
      * after a find this way we would
      * avoid two finds in QCache...
      */
     // qWarning("find it now %d", uid );
     if (m_cache.contains( uid ) ) {
         return m_cache.find( uid );
     }
 
     T t = m_backEnd->find( uid, ar, current, dir );
     cache( t );
     return t;
 }
 template <class T>
 void OPimAccessTemplate<T>::clear() {
     invalidateCache();
     m_backEnd->clear();
 }
 template <class T>
 bool OPimAccessTemplate<T>::add( const T& t ) {
     cache( t );
     return m_backEnd->add( t );
 }
 template <class T>
 bool OPimAccessTemplate<T>::remove( const T& t ) {
     return remove( t.uid() );
 }
 template <class T>
 bool OPimAccessTemplate<T>::remove( int uid ) {
     m_cache.remove( uid );
     return m_backEnd->remove( uid );
 }
 template <class T>
 bool OPimAccessTemplate<T>::replace( const T& t ) {
     m_cache.replace( t );
     return m_backEnd->replace( t );
 }
 template <class T>
 void OPimAccessTemplate<T>::invalidateCache() {
     m_cache.invalidate();
 }
 template <class T>
 OPimAccessTemplate<T>::BackEnd* OPimAccessTemplate<T>::backEnd() {
     return m_backEnd;
 }
 template <class T>
 bool OPimAccessTemplate<T>::wasChangedExternally()const {
     return false;
 }
 template <class T>
 void OPimAccessTemplate<T>::setBackEnd( BackEnd* end ) {
     m_backEnd = end;
     if (m_backEnd )
         m_backEnd->setFrontend( this );
 }
 template <class T>
 void OPimAccessTemplate<T>::cache( const T& t ) const{
     /* hacky we need to work around the const*/
     ((OPimAccessTemplate<T>*)this)->m_cache.add( t );
 }
 template <class T>
 void OPimAccessTemplate<T>::setSaneCacheSize( int size ) {
     m_cache.setSize( size );
 }
+template <class T>
+void OPimAccessTemplate<T>::setReadAhead( uint count ) {
+    m_backEnd->setReadAhead( count );
+}
 #endif