Enum Observer 

pub enum Observer<M>
where
    M: Message,
{
    Register(Recipient<M>),
    Unregister(Recipient<M>),
}

Available on crate feature observer only.

A message which is used to register/unregister an observer.

Handler<Observer<M>> is implemented for all actors which implement SubjectActor<M> automatically.

Variants

Register(Recipient<M>)

Register an observer.

Unregister(Recipient<M>)

Unregister an observer.

Trait Implementations

impl<M> Debug for Observer<M>

where M: Message,

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<A, M> Handler<Observer<M>> for A

where A: SubjectActor<M>, M: Message + Clone,

type Result = ()

The return type of the handler, which must implement MessageResponse.

fn handle( &mut self, msg: Observer<M>, ctx: &mut Self::Context, ) -> impl Future<Output = Self::Result> + Send

Handles a message.

impl<M> HasStableTypeId for Observer<M>

where M: Message + HasStableTypeId,

const STABLE_TYPE_ID: StableTypeId

Available on crate feature identifier only.

impl<M> Message for Observer<M>

where M: Message,

type Result = ()

The type of the response produced when this message is handled.

impl<M> MessageId for Observer<M>

where M: Message + HasStableTypeId,

Available on crate feature identifier only.

const ID: u64