public interface ValueConvertable<V1, V2>
To support caches whose values are convertable, e.g. SoftReference, WeakReference
V1 -  source value type, e.g. SoftReference, WeakReferenceV2 -  target value type, e.g. value that SoftReference or WeakReference referenced| Type Params | Return Type | Name and description | 
|---|---|---|
|  | public V2 | convertValue(V1 value)convert the original value to the target value |