public NodeDescriptor getSingleSubscribedBroker(Filter filter) {
NodeDescriptor foundBroker = null;
// iterates over the subscribed neighbors
Set keys = data.keySet();
synchronized (data) {
Iterator it = keys.iterator();
while (it.hasNext()) {
NodeDescriptor currentNeighbor = (NodeDescriptor) it.next();
if (((Collection) data.get(currentNeighbor)).contains(filter)) {
if (foundBroker != null || !currentNeighbor.isBroker()) { // more
// than
// one
// broker
// found
// or
// a
// client
// found
return null;
}
foundBroker = currentNeighbor;
}
}
}
return foundBroker;
}
public Collection getAllFiltersExcept(boolean duplicate, NodeDescriptor n) {
Collection result = new ArrayList();
Set keys = data.keySet();
synchronized (data) {
Iterator it = keys.iterator();
NodeDescriptor currentNeighbor;
while (it.hasNext()) {
currentNeighbor = (NodeDescriptor) it.next();
if (currentNeighbor.equals(n)) continue; // skip neighbor n
Collection filters = (Collection) data.get(currentNeighbor);
if (duplicate) result.addAll(filters);
else {
Iterator it1 = filters.iterator();
while (it1.hasNext()) {
Filter f = (Filter) it1.next();
if (!result.contains(f)) result.add(f);
}
}
}
}
return result;
}
public Collection matches(Message message, NodeDescriptor senderID) {
List matchingNeighbors = new ArrayList();
// iterates over the subscribed neighbors
Set keys = data.keySet();
synchronized (data) {
Iterator it = keys.iterator();
NodeDescriptor currentNeighbor;
while (it.hasNext()) {
currentNeighbor = (NodeDescriptor) it.next();
// Check if currentNeighbor is subscribed to the message
// iterates over the set of filters for currentNeighbor
if (senderID.equals(currentNeighbor)) continue;
Iterator it1 = ((Collection) data.get(currentNeighbor)).iterator();
while (it1.hasNext()) {
Filter f = (Filter) it1.next();
if (f.matches(message)) {
matchingNeighbors.add(currentNeighbor);
break;
}
}
}
}
return matchingNeighbors;
}