Getter putGetter(Class clazz, String attributeName, Getter getter) {
SampleableConcurrentHashMap<String, Getter> cache =
getOrPutIfAbsent(getterCache, clazz, getterCacheConstructor);
Getter foundGetter = cache.putIfAbsent(attributeName, getter);
evictOnPut(cache);
return foundGetter == null ? getter : foundGetter;
}
/**
* It works on best effort basis. If multi-threaded calls involved it may evict all elements, but
* it's unlikely.
*/
private void evictMap(
SampleableConcurrentHashMap<?, ?> map, int triggeringEvictionSize, int afterEvictionSize) {
int mapSize = map.size();
if (mapSize - triggeringEvictionSize >= 0) {
for (Map.Entry entry : map.getRandomSamples(mapSize - afterEvictionSize)) {
map.remove(entry.getKey());
}
}
}
int getGetterPerClassCacheSize(Class clazz) {
SampleableConcurrentHashMap cacheForClass = getterCache.get(clazz);
return cacheForClass != null ? cacheForClass.size() : -1;
}