How to use

InternMap$ValueConstructor

in

com.netflix.hystrix.util

public V interned(K key) {
  V existingKey = storage.get(key);
  V newKey = null;
  if (existingKey == null) {
    newKey = valueConstructor.create(key);
    existingKey = storage.putIfAbsent(key, newKey);
  }
  return existingKey != null ? existingKey : newKey;
}

public V interned(K key) {
  V existingKey = storage.get(key);
  V newKey = null;
  if (existingKey == null) {
    newKey = valueConstructor.create(key);
    existingKey = storage.putIfAbsent(key, newKey);
  }
  return existingKey != null ? existingKey : newKey;
}