Struct EventListener

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pub struct EventListener { /* private fields */ }

Expand description

A guard waiting for a notification from an Event.

There are two ways for a listener to wait for a notification:

In an asynchronous manner using .await.
In a blocking manner by calling EventListener::wait() on it.

If a notified listener is dropped without receiving a notification, dropping will notify another active listener. Whether one additional listener will be notified depends on what kind of notification was delivered.

Implementations§

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impl EventListener

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pub fn wait(self)

Blocks until a notification is received.

§Examples

use event_listener::Event;

let event = Event::new();
let listener = event.listen();

// Notify `listener`.
event.notify(1);

// Receive the notification.
listener.wait();

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pub fn wait_timeout(self, timeout: Duration) -> bool

Blocks until a notification is received or a timeout is reached.

Returns true if a notification was received.

§Examples

use std::time::Duration;
use event_listener::Event;

let event = Event::new();
let listener = event.listen();

// There are no notification so this times out.
assert!(!listener.wait_timeout(Duration::from_secs(1)));

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pub fn wait_deadline(self, deadline: Instant) -> bool

Blocks until a notification is received or a deadline is reached.

Returns true if a notification was received.

§Examples

use std::time::{Duration, Instant};
use event_listener::Event;

let event = Event::new();
let listener = event.listen();

// There are no notification so this times out.
assert!(!listener.wait_deadline(Instant::now() + Duration::from_secs(1)));

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pub fn discard(self) -> bool

Drops this listener and discards its notification (if any) without notifying another active listener.

Returns true if a notification was discarded.

§Examples

use event_listener::Event;

let event = Event::new();
let listener1 = event.listen();
let listener2 = event.listen();

event.notify(1);

assert!(listener1.discard());
assert!(!listener2.discard());

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pub fn listens_to(&self, event: &Event) -> bool

Returns true if this listener listens to the given Event.

§Examples

use event_listener::Event;

let event = Event::new();
let listener = event.listen();

assert!(listener.listens_to(&event));

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pub fn same_event(&self, other: &EventListener) -> bool

Returns true if both listeners listen to the same Event.

§Examples

use event_listener::Event;

let event = Event::new();
let listener1 = event.listen();
let listener2 = event.listen();

assert!(listener1.same_event(&listener2));