public synchronized void clear() {
		for (Entry<K, CachedValue> entry : map.entrySet()) {
			CachedValue value = entry.getValue();
			valueRemoved(value.getKey(), value.getValue());
		}
		map.clear();
	}
Clears all the values in the cache. The expired callback will be called for each entry
that was in the cache.
Ghidra/Framework/Generic/src/main/java/ghidra/util/timer/GTimerCache.java