Struct Interest

pub struct Interest(/* private fields */);

Indicates a Subscriber’s interest in a particular callsite.

Subscribers return an Interest from their register_callsite methods in order to determine whether that span should be enabled or disabled.

Implementations

impl Interest

pub fn never() -> Interest

Returns an Interest indicating that the subscriber is never interested in being notified about a callsite.

If all active subscribers are never() interested in a callsite, it will be completely disabled unless a new subscriber becomes active.

pub fn sometimes() -> Interest

Returns an Interest indicating the subscriber is sometimes interested in being notified about a callsite.

If all active subscribers are sometimes or never interested in a callsite, the currently active subscriber will be asked to filter that callsite every time it creates a span. This will be the case until a new subscriber expresses that it is always interested in the callsite.

pub fn always() -> Interest

Returns an Interest indicating the subscriber is always interested in being notified about a callsite.

If any subscriber expresses that it is always() interested in a given callsite, then the callsite will always be enabled.

pub fn is_never(&self) -> bool

Returns true if the subscriber is never interested in being notified about this callsite.

pub fn is_sometimes(&self) -> bool

Returns true if the subscriber is sometimes interested in being notified about this callsite.

pub fn is_always(&self) -> bool

Returns true if the subscriber is always interested in being notified about this callsite.

Trait Implementations

impl Clone for Interest

fn clone(&self) -> Interest

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Interest

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

Formats the value using the given formatter.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte