public static void mediate(final Event event) {
        final Scope scope = event.getScope();
        final DecomposedRoiEntry[] values = registry.get(scope.getAreaLevelHash());
        if (values != null) {
            final HashSet<EventConsumer> consumers = new HashSet<EventConsumer>(values.length);
            for (int i = 0; i < values.length; i++) {
                final DecomposedRoiEntry value = values[i];
                if (value.hasInterest(scope)) {
                    final EventConsumer eventConsumer = value.getEventConsumer();
                    if (!consumers.contains(eventConsumer)) {
                        consumers.add(eventConsumer);
                        eventConsumer.consume(event);
                    }
                }
            }
        }
    }

public static void mediate(final Event event) {
        final Scope scope = event.getScope();
        final DecomposedRoiEntry[] values = registry.get(scope.getAreaLevelHash());
        if (values == null) 
            return ;
          final HashSet<EventConsumer> consumers = new HashSet<EventConsumer>(values.length);
            for (int i = 0; i < values.length; i++) {
                final DecomposedRoiEntry value = values[i];
                if (!value.hasInterest(scope) || consumers.contains(getEventConsumer(event)))
                      continue;
                consumers.add(eventConsumer);
                getEventConsumer(event).consume(event);
                      
             }
    }

  private static getEventConsumer(DecomposedRoiEntry value){
     return value.getEventConsumer();
}