/** Cancels requests whose deadline has past. */
public void cancelExpiredRequests() {
long now = System.currentTimeMillis();
for (R request : requests.values()) {
if (request.getDeadline() <= now) {
request.cancel();
}
}
}
/** Cancels the request identified by {@code key}. */
public void cancel(K key) {
R request = requests.get(key);
if (request != null) {
request.cancel();
}
}