public void unsubscribe(USK origUSK, USKCallback cb) {
USKFetcher toCancel = null;
synchronized (this) {
USK clear = origUSK.clearCopy();
USKCallback[] callbacks = subscribersByClearUSK.get(clear);
if (callbacks
== null) { // maybe we should throw something ? shall we allow multiple unsubscriptions ?
if (logMINOR) Logger.minor(this, "No longer subscribed");
return;
}
int j = 0;
for (USKCallback c : callbacks) {
if ((c != null) && (c != cb)) {
callbacks[j++] = c;
}
}
USKCallback[] newCallbacks = Arrays.copyOf(callbacks, j);
if (newCallbacks.length > 0) subscribersByClearUSK.put(clear, newCallbacks);
else {
subscribersByClearUSK.remove(clear);
}
USKFetcher f = backgroundFetchersByClearUSK.get(clear);
if (f != null) {
f.removeSubscriber(cb, context);
if (!f.hasSubscribers()) {
toCancel = f;
backgroundFetchersByClearUSK.remove(clear);
}
}
// Temporary background fetchers run once and then die.
// They do not care about callbacks.
}
if (toCancel != null) {
toCancel.cancel(null, context);
} else {
if (logMINOR) Logger.minor(this, "Not found unsubscribing: " + cb + " for " + origUSK);
}
}
