# Package org.apache.groovy.util.concurrent

- Interface Summary
  Interface | Description
  --- | ---
  LazyInitializable | A `LazyInitializable` is an object that can be initialized lazily.

- Class Summary
  Class | Description
  --- | ---
  ConcurrentReferenceHashMap | An advanced hash table supporting configurable garbage collection semantics of keys and values, optional referential-equality, full concurrency of retrievals, and adjustable expected concurrency for updates.
  ConcurrentReferenceHashMap.HashIterator |
  ConcurrentReferenceHashMap.InitializableEntry |
  ConcurrentReferenceHashMap.SimpleEntry |
  ConcurrentReferenceHashMap.WriteThroughEntry | Custom Entry class used by EntryIterator.next(), that relays setValue changes to the underlying map.
  ManagedIdentityConcurrentMap | This is a basic implementation of a map able to forget its keys could be weak/soft/strong references.

- Enum Summary
  Enum | Description
  --- | ---
  ConcurrentReferenceHashMap.Option | Behavior-changing configuration options for the map
  ConcurrentReferenceHashMap.ReferenceType | An option specifying which Java reference type should be used to refer to a key and/or value.