/**
* Retrieves the response from the queue matching the given key, blocking until it is received.
*
* @param k Response
* @return Response
* @throws InterruptedException if interrupted while waiting
*/
public synchronized V take(K k) throws InterruptedException {
final V v = taken.remove(k);
if (v != null) {
return v;
}
// Take the laundry out of the machine. If it's ours, leave with it.
// If it's someone else's, fold it neatly and put it on the pile.
for (; ; ) {
final Pair<K, V> pair = queue.take();
if (pair.left.equals(k)) {
return pair.right;
} else {
taken.put(pair.left, pair.right);
}
}
}
