Nexus API Reference

BehaviorWithState

in package

• Application

Result type returned from a stateful actor handler.

$behavior = Behavior::withState(
    0,
    static function (ActorContext $ctx, object $msg, int $count): BehaviorWithState {
        return match (true) {
            $msg instanceof Increment => BehaviorWithState::next($count + 1),
            $msg instanceof Reset     => BehaviorWithState::next(0),
            $msg instanceof GetCount  => (static function () use ($ctx, $count): BehaviorWithState {
                $ctx->sender()?->tell(new CountValue($count));
                return BehaviorWithState::same();
            })(),
            default => BehaviorWithState::same(),
        };
    },
);

Tags

see

Behavior::withState()

for the factory that creates stateful behaviors

StatefulActorHandler

for the class-based alternative

psalm-api

psalm-immutable

template-covariant

of object

Table of Contents

Methods

behavior()  : Behavior<string|int, T>|null

The new behavior to switch to, or null to keep the current behavior.

hasNewState()  : bool

Whether the handler returned a new state (even if that state is null).

isStopped()  : bool

next()  : BehaviorWithState<never, NS>

Same behavior, new state.

same()  : BehaviorWithState<never, never>

Keep both behavior and state.

state()  : S

The new state value. Only meaningful when hasNewState() returns true.

stopped()  : BehaviorWithState<never, never>

Stop the actor.

withBehavior()  : BehaviorWithState<U, NS>

Switch both behavior and state.