Settings: Add a column to store the number of cached media

src/MediaLibrary.cpp

@@ -2099,6 +2099,9 @@ void MediaLibrary::migrateModel36to37()
     for ( const auto& req : reqs )
         sqlite::Tools::executeRequest( dbConn, req );
 
+    Settings::createTable( dbConn );
+    m_settings.load();
+
     m_settings.setDbModelVersion( 37 );
     t->commit();
 }

src/Settings.cpp

@@ -35,6 +35,7 @@ namespace medialibrary
 const uint32_t Settings::DbModelVersion = 37u;
 const uint32_t Settings::MaxTaskAttempts = 2u;
 const uint32_t Settings::MaxLinkTaskAttempts = 6u;
+const uint32_t Settings::DefaultNbCachedMediaPerCollection = 2u;
 
 Settings::Settings( MediaLibrary* ml )
     : m_ml( ml )
@@ -50,8 +51,9 @@ bool Settings::load()
     if ( row == nullptr )
     {
         if ( sqlite::Tools::executeInsert( m_ml->getConn(),
-                "INSERT INTO Settings VALUES(?, ?, ?)",
-                DbModelVersion, MaxTaskAttempts, MaxLinkTaskAttempts ) == false )
+                "INSERT INTO Settings VALUES(?, ?, ?, ?)",
+                DbModelVersion, MaxTaskAttempts, MaxLinkTaskAttempts,
+                DefaultNbCachedMediaPerCollection ) == false )
         {
             return false;
         }
@@ -60,6 +62,8 @@ bool Settings::load()
     else
     {
         row >> m_dbModelVersion;
+        if ( m_dbModelVersion >= 37 )
+            row >> m_nbCachedMediaPerCollection;
         // safety check: there sould only be one row
         assert( s.row() == nullptr );
     }
@@ -81,12 +85,24 @@ bool Settings::setDbModelVersion( uint32_t dbModelVersion )
     return true;
 }
 
+bool Settings::setNbCachedMediaPerCollection( uint32_t nbCachedMedia )
+{
+    if ( m_nbCachedMediaPerCollection == nbCachedMedia )
+        return true;
+    const std::string req = "UPDATE Settings SET nb_cached_media_per_collection = ?";
+    if ( sqlite::Tools::executeUpdate( m_ml->getConn(), req, nbCachedMedia ) == false )
+        return false;
+    m_nbCachedMediaPerCollection = nbCachedMedia;
+    return true;
+}
+
 void Settings::createTable( sqlite::Connection* dbConn )
 {
     const std::string req = "CREATE TABLE IF NOT EXISTS Settings("
                 "db_model_version UNSIGNED INTEGER NOT NULL,"
                 "max_task_attempts UNSIGNED INTEGER NOT NULL,"
-                "max_link_task_attempts UNSIGNED INTEGER NOT NULL"
+                "max_link_task_attempts UNSIGNED INTEGER NOT NULL,"
+                "nb_cached_media_per_collection UNSIGNED INTEGER NOT NULL"
             ")";
     sqlite::Tools::executeRequest( dbConn, req );
 }

src/Settings.h

@@ -47,17 +47,20 @@ public:
      */
     uint32_t dbModelVersion() const;
     bool setDbModelVersion( uint32_t dbModelVersion );
+    bool setNbCachedMediaPerCollection( uint32_t nbCachedMedia );
 
     static void createTable( sqlite::Connection* dbConn );
 
     static const uint32_t DbModelVersion;
     static const uint32_t MaxTaskAttempts;
     static const uint32_t MaxLinkTaskAttempts;
+    static const uint32_t DefaultNbCachedMediaPerCollection;
 
 private:
     MediaLibrary* m_ml;
 
     uint32_t m_dbModelVersion;
+    uint32_t m_nbCachedMediaPerCollection;
 };
 
 }

src/database/migrations/migration36-37.sql

@@ -192,3 +192,6 @@ Collection::trigger( Collection::Triggers::PropagateTaskDeletion, 37 ),
 Collection::trigger( Collection::Triggers::IncrementCachedSize, 37 ),
 Collection::trigger( Collection::Triggers::DecrementCachedSize, 37 ),
 Collection::trigger( Collection::Triggers::DecrementCachedSizeOnRemoval, 37 ),
+
+"DROP TABLE Settings",
+