@Override
public void attributes(final Map<String, ?> newAttributes) {
super.attributes(newAttributes);
synchronized (ConcurrentServiceWatcher.this) {
if (null != currentExport && thisImport.equals(currentImport)) {
currentExport.attributes(newAttributes);
}
// has ranking changed?
updateBestService();
}
}
@Override
@SuppressWarnings("unchecked")
public void put(final T newInstance) {
super.put(newInstance);
synchronized (ConcurrentServiceWatcher.this) {
if (null != currentExport && thisImport.equals(currentImport)) {
currentExport.put((S) newInstance);
// is this being removed?
if (null == newInstance) {
updateBestService();
}
}
}
}
void updateBestService() {
// check the last-known best service is still the best
final Iterator<Import<S>> i = services.iterator();
final Import<S> bestImport = i.hasNext() ? i.next() : null;
if (null != currentImport && currentImport.equals(bestImport)) {
return; // still the same...
}
// best service has changed
if (null != currentExport) {
currentExport.unput();
}
// report service (if any)
currentImport = bestImport;
currentExport = null == bestImport ? null : watcher.add(bestImport);
}