private void prune() {
// Remove all values that are too old
TimeInterval periodAllowed = cachedPeriod.before(buffer.getLast().getTimestamp());
while (!buffer.isEmpty() && !periodAllowed.contains(buffer.getFirst().getTimestamp())) {
// Discard value
buffer.removeFirst();
}
}
/**
* Returns all values since last check and removes values from the queue.
*
* @return a new array with the value; never null
*/
@Override
public List<T> getValue() {
synchronized (buffer) {
if (buffer.isEmpty()) return Collections.emptyList();
// period allowed time = latest - msCache / 1000
TimeInterval periodAllowed =
cachedPeriod.before(TimeStamp.asTimestamp(TimeSupport.timestampOf(buffer.getLast())));
while (!buffer.isEmpty()
&& !periodAllowed.contains(
TimeStamp.asTimestamp(TimeSupport.timestampOf(buffer.getFirst())))) {
// Discard value
buffer.removeFirst();
}
return new ArrayList<T>(buffer);
}
}