/* (non-Javadoc)
* @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
*/
public int compare(Object a, Object b) throws ClassCastException {
if (a == null) {
return -1;
} else if (b == null) {
return 1;
} else if (a == null && b == null) {
return 0;
} else {
MessageBid bida = (MessageBid) a;
MessageBid bidb = (MessageBid) b;
Double d_c1 = new Double(bida.getPrice());
Double d_c2 = new Double(bidb.getPrice());
return d_c2.compareTo(d_c1);
}
}
/**
* Called when a ask is sent by a provider.
*
* @param ask the ask sent by the provider
*/
public void onReceiveAsk(MessageAsk ask) {
synchronized (syncObj) {
Collections.sort(bids, compBids);
if (bids.size() > 0) {
MessageBid bid = (MessageBid) bids.getFirst();
double priceAsk = ask.getPrice();
double priceBid = bid.getPrice();
if (priceBid >= priceAsk) {
double finalPrice = (priceAsk + priceBid) / 2;
super.match(ask, bid, finalPrice);
bids.remove(bid);
} else {
asks.add(ask);
}
} else {
asks.add(ask);
}
}
}