Enum DeliveryEvent 

pub enum DeliveryEvent<E> {
    Entry(E),
    Failure(Error),
}

What the deliverer hands its handler: an entry, or why it could not pop one.

A failure is the instance’s own pop failing – a submission its doorbell could not issue, or a ring it could not read (DI-D-58). It is reported once per wake, and the delivery goes on: the next wake delivers what can be, and a cause that stays is reported again. The handler’s remedy for one that stays is to stop and drop the delivery, which hands the instance back (into_inner) or closes it (close).

Variants

Entry(E)

The next entry, in queue order.

Failure(Error)

The instance’s pop failed. The error says why, and downcasts to the cause the instance reported, as an instance’s own pop error does.

Trait Implementations

impl<E: Debug> Debug for DeliveryEvent<E>

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

Formats the value using the given formatter.