public boolean isCollectionUsageThresholdExceeded() {

            if (!isCollectionUsageThresholdSupported()) {
                throw new UnsupportedOperationException(
                    "CollectionUsage threshold is not supported");
            }

            // return false if usage threshold crossing checking is disabled
            if (collectionThreshold == 0) {
                return false;
            }

            MemoryUsage u = getCollectionUsage0();
            return (gcSensor.isOn() ||
                    (u != null && u.getUsed() >= collectionThreshold));
        }