* Don't sync empty DbCmd_DeleteFiles & irrelevant DbCmd_LogPlaybacks.

src/libtomahawk/database/databasecommand_deletefiles.h

@@ -55,6 +55,7 @@ public:
 
     virtual void exec( DatabaseImpl* );
     virtual bool doesMutates() const { return true; }
+    virtual bool localOnly() const { return m_files.isEmpty(); }
     virtual void postCommitHook();
 
     QStringList files() const { return m_files; }

src/libtomahawk/database/databasecommand_logplayback.cpp

@@ -28,16 +28,10 @@
 using namespace Tomahawk;
 
 
-// After changing a collection, we need to tell other bits of the system:
 void
 DatabaseCommand_LogPlayback::postCommitHook()
 {
     qDebug() << Q_FUNC_INFO;
-    if ( source().isNull() || source()->collection().isNull() )
-    {
-        qDebug() << "Source has gone offline, not emitting to GUI.";
-        return;
-    }
 
     connect( this, SIGNAL( trackPlaying( Tomahawk::query_ptr ) ),
              source().data(), SLOT( onPlaybackStarted( Tomahawk::query_ptr ) ), Qt::QueuedConnection );
@@ -56,12 +50,8 @@ DatabaseCommand_LogPlayback::postCommitHook()
         emit trackPlaying( q );
     }
 
-    if( source()->isLocal() )
+    if ( source()->isLocal() )
     {
-        // Only tell remote sources about tracks that we listen to long enough
-        if ( m_secsPlayed < 20 )
-            return;
-
         Servent::instance()->triggerDBSync();
     }
 }
@@ -103,3 +93,11 @@ DatabaseCommand_LogPlayback::exec( DatabaseImpl* dbi )
 
     query.exec();
 }
+
+
+bool
+DatabaseCommand_LogPlayback::localOnly() const
+{
+    return m_secsPlayed < 20;
+}
+

src/libtomahawk/database/databasecommand_logplayback.h

@@ -68,6 +68,7 @@ public:
 
     virtual bool doesMutates() const { return true; }
     virtual bool singletonCmd() const { return ( m_action == Started ); }
+    virtual bool localOnly() const;
 
     QString artist() const { return m_artist; }
     void setArtist( const QString& s ) { m_artist = s; }

src/libtomahawk/database/databaseworker.cpp

@@ -111,7 +111,7 @@ DatabaseWorker::doWork()
         {
             cmd->_exec( m_dbimpl ); // runs actual SQL stuff
 
-            if( cmd->loggable() && !cmd->localOnly() )
+            if ( cmd->loggable() && !cmd->localOnly() )
             {
                 // We only save our own ops to the oplog, since incoming ops from peers
                 // are applied immediately.
@@ -119,7 +119,7 @@ DatabaseWorker::doWork()
                 // Crazy idea: if peers had keypairs and could sign ops/msgs, in theory it
                 // would be safe to sync ops for friend A from friend B's cache, if he saved them,
                 // which would mean you could get updates even if a peer was offline.
-                if( cmd->source()->isLocal() )
+                if ( cmd->source()->isLocal() )
                 {
                     // save to op-log
                     DatabaseCommandLoggable* command = (DatabaseCommandLoggable*)cmd.data();
@@ -148,7 +148,7 @@ DatabaseWorker::doWork()
                 }
             }
 
-            if( cmd->doesMutates() )
+            if ( cmd->doesMutates() )
             {
                 qDebug() << "Committing" << cmd->commandname();;
                 if( !m_dbimpl->database().commit() )