Struct async_broadcast::InactiveReceiver

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pub struct InactiveReceiver<T> { /* private fields */ }

Expand description

An inactive receiver.

An inactive receiver is a receiver that is unable to receive messages. It’s only useful for keeping a channel open even when no associated active receivers exist.

Implementations§

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impl<T> InactiveReceiver<T>

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pub fn activate(self) -> Receiver<T>

Convert to an activate Receiver.

Consumes self. Use InactiveReceiver::activate_cloned if you want to keep self.

§Examples

use async_broadcast::{broadcast, TrySendError};

let (s, r) = broadcast(1);
let inactive = r.deactivate();
assert_eq!(s.try_broadcast(10), Err(TrySendError::Inactive(10)));

let mut r = inactive.activate();
assert_eq!(s.try_broadcast(10), Ok(None));
assert_eq!(r.try_recv(), Ok(10));

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pub fn activate_cloned(&self) -> Receiver<T>

Create an activate Receiver for the associated channel.

§Examples

use async_broadcast::{broadcast, TrySendError};

let (s, r) = broadcast(1);
let inactive = r.deactivate();
assert_eq!(s.try_broadcast(10), Err(TrySendError::Inactive(10)));

let mut r = inactive.activate_cloned();
assert_eq!(s.try_broadcast(10), Ok(None));
assert_eq!(r.try_recv(), Ok(10));

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pub fn capacity(&self) -> usize

Returns the channel capacity.

See Receiver::capacity documentation for examples.

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pub fn set_capacity(&mut self, new_cap: usize)

Set the channel capacity.

There are times when you need to change the channel’s capacity after creating it. If the new_cap is less than the number of messages in the channel, the oldest messages will be dropped to shrink the channel.

See Receiver::set_capacity documentation for examples.

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pub fn overflow(&self) -> bool

If overflow mode is enabled on this channel.

See Receiver::overflow documentation for examples.

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pub fn set_overflow(&mut self, overflow: bool)

Set overflow mode on the channel.

When overflow mode is set, broadcasting to the channel will succeed even if the channel is full. It achieves that by removing the oldest message from the channel.

See Receiver::set_overflow documentation for examples.

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pub fn await_active(&self) -> bool

If sender will wait for active receivers.

If set to false, Send will resolve immediately with a SendError. Defaults to true.

§Examples

use async_broadcast::broadcast;

let (_, r) = broadcast::<i32>(5);
let r = r.deactivate();
assert!(r.await_active());

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pub fn set_await_active(&mut self, await_active: bool)

Specify if sender will wait for active receivers.

If set to false, Send will resolve immediately with a SendError. Defaults to true.

§Examples

use async_broadcast::broadcast;

let (s, r) = broadcast::<i32>(2);
s.broadcast(1).await.unwrap();

let mut r = r.deactivate();
r.set_await_active(false);
assert!(s.broadcast(2).await.is_err());

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pub fn close(&self) -> bool

Closes the channel.

Returns true if this call has closed the channel and it was not closed already.

The remaining messages can still be received.

See Receiver::close documentation for examples.

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pub fn is_closed(&self) -> bool

Returns true if the channel is closed.

See Receiver::is_closed documentation for examples.

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pub fn is_empty(&self) -> bool

Returns true if the channel is empty.

See Receiver::is_empty documentation for examples.

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pub fn is_full(&self) -> bool

Returns true if the channel is full.

See Receiver::is_full documentation for examples.

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pub fn len(&self) -> usize

Returns the number of messages in the channel.

See Receiver::len documentation for examples.

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pub fn receiver_count(&self) -> usize

Returns the number of receivers for the channel.

This does not include inactive receivers. Use InactiveReceiver::inactive_receiver_count if you’re interested in that.

§Examples

use async_broadcast::broadcast;

let (s, r) = broadcast::<()>(1);
assert_eq!(s.receiver_count(), 1);
let r = r.deactivate();
assert_eq!(s.receiver_count(), 0);

let r2 = r.activate_cloned();
assert_eq!(r.receiver_count(), 1);
assert_eq!(r.inactive_receiver_count(), 1);

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pub fn inactive_receiver_count(&self) -> usize

Returns the number of inactive receivers for the channel.

§Examples

use async_broadcast::broadcast;

let (s, r) = broadcast::<()>(1);
assert_eq!(s.receiver_count(), 1);
let r = r.deactivate();
assert_eq!(s.receiver_count(), 0);

let r2 = r.activate_cloned();
assert_eq!(r.receiver_count(), 1);
assert_eq!(r.inactive_receiver_count(), 1);