question: public void add ( SchedulableEvent event ) { synchronized ( lock ) { FastEventQueue list = mEventBuffer . get ( event . getTimestamp ( ) ) ; if ( list == null ) { long lowestTime = mEventBuffer . isEmpty ( ) ? Long . MAX_VALUE : mEventBuffer . firstKey ( ) ; list = new FastEventQueue ( event ) ; mEventBuffer . put ( event . getTimestamp ( ) , list ) ; if ( event . getTimestamp ( ) < lowestTime ) { lock . notify ( ) ; } } else { list . add ( event ) ; } } }
target:  Add an event to the scheduler. Events with the same time will be processed in order.