ai.eloquent.raft

Interface KeyValueStateMachine.ChangeListener

Enclosing class:

KeyValueStateMachine

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 static interface KeyValueStateMachine.ChangeListener

This holds a locally registered callback that will be called whenever the state machine changes. This lets code wait for changes to the cluster, and respond appropriately.

Method Summary

Modifier and Type	Method and Description
void	onChange(java.lang.String changedKey, java.util.Optional<byte[]> newValue, java.util.Map<java.lang.String,byte[]> state) Run on a value of the state machine changing.

Method Detail

onChange

void onChange(java.lang.String changedKey,
              java.util.Optional<byte[]> newValue,
              java.util.Map<java.lang.String,byte[]> state)

Run on a value of the state machine changing.

Parameters:

changedKey - The key that changed.

newValue - The new value of the changed key, or Optional.empty() if we are removing a key.

state - The new complete state of the state machine.