Returns the value JUST BEFORE the merge.
Returns the value JUST BEFORE the merge. If it is empty, it is like a zero. the key should hold: val (k,v) = kv result = get(k) key is set to: result.map(Semigroup.plus(_, Some(v)).getOrElse(v) after this.
merge a set of keys.
merge a set of keys.
The semigroup equivalent to the merge operation of this store
The semigroup equivalent to the merge operation of this store
A MergeableStore that does the same buffering as BufferingMergeable, but flushes on put/get.