Package org.codehaus.groovy.runtime.memoize

## Interface MemoizeCache<K,​V>

- Type Parameters:
    `K` - type of the keys
    `V` - type of the values
  All Known Subinterfaces:
    `EvictableCache<K,​V>`
  All Known Implementing Classes:
    `CommonCache`, `ConcurrentCommonCache`, `ConcurrentSoftCache`, `LRUCache`, `UnlimitedConcurrentCache`

      public interface MemoizeCache<K,​V>

  Represents a memoize cache with its essential methods

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Interface | Description
    --- | --- | ---
    `static interface` | `MemoizeCache.ValueProvider<K,​V>` | Represents a provider used to create value

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `cleanUpNullReferences()` | Invoked when some of the held SoftReferences have been evicted by the garbage collector and so should be removed from the cache.
    `V` | `get​(K key)` | Gets a value from the cache
    `V` | `getAndPut​(K key, MemoizeCache.ValueProvider<? super K,​? extends V> valueProvider)` | Try to get the value from cache.
    `V` | `put​(K key, V value)` | Associates the specified value with the specified key in the cache.

- - ### Method Detail

    - #### put

          V put​(K key,
                V value)

      Associates the specified value with the specified key in the cache.
      Parameters:
        `key` - key with which the specified value is to be associated
        `value` - value to be associated with the specified key
      Returns:
        null, or the old value if the key associated with the specified key.

    - #### get

          V get​(K key)

      Gets a value from the cache
      Parameters:
        `key` - the key whose associated value is to be returned
      Returns:
        the value, or null, if it does not exist.

    - #### getAndPut

          V getAndPut​(K key,
                      MemoizeCache.ValueProvider<? super K,​? extends V> valueProvider)

      Try to get the value from cache. If not found, create the value by `MemoizeCache.ValueProvider` and put it into the cache, at last return the value
      Parameters:
        `key` -
      Returns:
        the cached value

    - #### cleanUpNullReferences

          void cleanUpNullReferences()

      Invoked when some of the held SoftReferences have been evicted by the garbage collector and so should be removed from the cache. The implementation must ensure that concurrent invocations of all methods on the cache may occur from other threads and thus should protect any shared resources.