Coordinated is a message wrapper that adds a
CommitBarrier for explicitly
coordinating transactions across actors or threads.
Akka-specific exception for coordinated transactions.
Used for specifying actor refs and messages to send to during coordination.
An actor with built-in support for coordinated transactions.
(Since version 2.3) akka.transactor will be removed
An UntypedActor version of transactor for using from Java.