private void checkForSpace() {
		if(knownAuctionEvents.size()>1000) {
			for(int i = 0; i < 500; i++) {
				knownAuctionEvents.remove(0);
			}
		}
		if(knownUserEvents.size()>1000) {
			for(int i = 0; i < 500; i++) {
				knownUserEvents.remove(0);
			}
		}
		if(knownBidEvents.size()>1000) {
			for(int i = 0; i < 500; i++) {
				knownBidEvents.remove(0);
			}
		}
		if(knownStatisticsEvents.size()>1000) {
			for(int i = 0; i < 500; i++) {
				knownStatisticsEvents.remove(0);
			}
		}
	}