Struct Channels 

pub struct Channels { /* private fields */ }

The channels one notification goes out on.

Selected by type, not by name, for the same reason middleware is: a misspelled "mial" is a notification that silently goes nowhere, and deleting a channel should break every notification that used it in the compiler.

let channels = Channels::new().with::<LogChannel>().with::<MemoryChannel>();

assert_eq!(channels.len(), 2);

Implementations

impl Channels

pub fn new() -> Channels

No channels. A notification returning this is not sent anywhere, which is a legitimate answer — “this user has opted out of everything”.

pub fn with<C>(self) -> Channels

where C: Channel,

Add a channel.

By type only — no instance and no Default bound. Selecting a channel and configuring one are different things: a MailChannel needs a mailer, and the notification has no business holding one.

pub fn len(&self) -> usize

How many channels are selected.

pub fn is_empty(&self) -> bool

Whether none are.

pub fn iter(&self) -> impl Iterator<Item = (TypeId, &'static str)>

The selected channels, in order.

pub fn names(&self) -> Vec<&'static str>

Their type names, for diagnostics.

A channel’s own name — the one route_for is asked about — comes from the configured instance, which only the notifier has.

Trait Implementations

impl Clone for Channels

fn clone(&self) -> Channels

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Channels

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

Formats the value using the given formatter.

impl Default for Channels

fn default() -> Channels

Returns the “default value” for a type.

impl Eq for Channels

impl PartialEq for Channels

fn eq(&self, other: &Channels) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Channels