| Class | Description | 
                            | CommonCache | Represents a simple key-value cache, which is NOT thread safe and backed by a Map instance | 
                            | ConcurrentCommonCache | Represents a simple key-value cache, which is thread safe and backed by a Map instance | 
                            | ConcurrentSoftCache | Represents concurrent cache holding SoftReference instance as value | 
                            | LRUCache | A cache backed by a ConcurrentLinkedHashMap | 
                            | Memoize | Implements memoize for Closures. | 
                            | NullProtectionStorage | A NullObject pattern implementation for ProtectionStorage
 Doesn't protect any resources. | 
                            | StampedCommonCache | Represents a simple key-value cache, which is thread safe and backed by a Map instance. | 
                            | UnlimitedConcurrentCache | A cache backed by a ConcurrentHashMap |