stateMachine.addTransition(Snapshot.State.Copying, Event.OperationSucceeded, Snapshot.State.BackedUp);
stateMachine.addTransition(Snapshot.State.Copying, Event.OperationFailed, Snapshot.State.BackedUp);
stateMachine.addTransition(Snapshot.State.Destroying, Event.OperationSucceeded, Snapshot.State.Destroyed);
stateMachine.addTransition(Snapshot.State.Destroying, Event.OperationFailed, State.BackedUp);
stateMachine.registerListener(new SnapshotStateListener());
}