void restore( byte key, byte value)
Used exclusively when
StateRestoreCallback is a functional interface in Java.
Functional interface is an interface that has just one abstract method (aside from the methods of
java.lang.Object), and thus represents a single function contract.
In addition to the usual process of creating an interface instance by declaring and instantiating a class, instances of functional interfaces can be created with method reference expressions and lambda expressions.
Because of this simplification of the Java language,
StateRestoreCallback implementations are usually anonymous classes and are defined and used in the following state stores:
The following are the regular named implementations.