com.fredhopper.lifecycle

Interface StateListener

All Superinterfaces:

BiFunction<State,State,Void>, EventListener

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface StateListener
extends EventListener, BiFunction<State,State,Void>

An event listener for a change of State. This is a FunctionalInterface through BiFunction over State parameter.

Method Summary

Modifier and Type	Method and Description
default Void	apply(State t, State u)
void	stateChanged(State oldState, State newState) Published a change of State to the listener implementation.

Methods inherited from interface java.util.function.BiFunction

andThen

Method Detail

stateChanged

void stateChanged(State oldState,
                  State newState)
           throws Exception

Published a change of State to the listener implementation.

Parameters:

oldState - the previous state

newState - the current state effective now

Throws:

Exception - if the listener cannot accept such a change and decides to fail this state change

apply

default Void apply(State t,
                   State u)

Specified by:

apply in interface BiFunction<State,State,Void>