question: public synchronized void addChannelToHistory ( String channel ) { if ( ! settings . getBoolean ( "saveChannelHistory" ) ) { return ; } channel = prepareChannel ( channel ) ; if ( channel == null ) { return ; } settings . mapPut ( HISTORY_SETTING , channel , System . currentTimeMillis ( ) ) ; settings . setSettingChanged ( "channelHistory" ) ; }
target:  Adds a single channel to history, with the current time.