Cache representing an element of multi-index data structure.
Putting a value into it will populate all the linked caches in following manner:
key1 -> Value (belongs to this OdalLinkedCache)
key2 -> Value (belongs to different OdalLinkedCache)
....
keyN -> Value (belongs to different OdalLinkedCache)
Removing the Value by key1 from the cache will remove it from all other linked caches as well
author: Gennady Krizhevsky
Inner Class :public static class NullOdalLinkedCache implements OdalLinkedCache