Struct tracing_subscriber::subscribe::Identity

pub struct Identity { /* private fields */ }

A subscriber that does nothing.

Implementations

impl Identity

pub fn new() -> Self

Returns a new Identity subscriber.

Trait Implementations

impl Clone for Identity

fn clone(&self) -> Identity

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Identity

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

Formats the value using the given formatter.

impl Default for Identity

fn default() -> Identity

Returns the “default value” for a type.

impl<C: Collect> Subscribe<C> for Identity

fn on_register_dispatch(&self, collector: &Dispatch)

Performs late initialization when installing this subscriber as a collector.

fn on_subscribe(&mut self, collector: &mut C)

Performs late initialization when attaching a subscriber to a collector.

fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest

Registers a new callsite with this subscriber, returning whether or not the subscriber is interested in being notified about the callsite, similarly to Collect::register_callsite.

fn enabled(&self, metadata: &Metadata<'_>, ctx: Context<'_, C>) -> bool

Returns true if this subscriber is interested in a span or event with the given metadata in the current Context, similarly to Collect::enabled.

fn on_new_span(&self, attrs: &Attributes<'_>, id: &Id, ctx: Context<'_, C>)

Notifies this subscriber that a new span was constructed with the given Attributes and Id.

fn on_record(&self, _span: &Id, _values: &Record<'_>, _ctx: Context<'_, C>)

Notifies this subscriber that a span with the given Id recorded the given values.

fn on_follows_from(&self, _span: &Id, _follows: &Id, _ctx: Context<'_, C>)

Notifies this subscriber that a span with the ID span recorded that it follows from the span with the ID follows.

fn event_enabled(&self, _event: &Event<'_>, _ctx: Context<'_, C>) -> bool

Called before on_event, to determine if on_event should be called.

fn on_event(&self, _event: &Event<'_>, _ctx: Context<'_, C>)

Notifies this subscriber that an event has occurred.

fn on_enter(&self, _id: &Id, _ctx: Context<'_, C>)

Notifies this subscriber that a span with the given ID was entered.

fn on_exit(&self, _id: &Id, _ctx: Context<'_, C>)

Notifies this subscriber that the span with the given ID was exited.

fn on_close(&self, _id: Id, _ctx: Context<'_, C>)

Notifies this subscriber that the span with the given ID has been closed.

fn on_id_change(&self, _old: &Id, _new: &Id, _ctx: Context<'_, C>)

Notifies this subscriber that a span ID has been cloned, and that the subscriber returned a different ID.

fn and_then<S>(self, subscriber: S) -> Layered<S, Self, C>

where S: Subscribe<C>, Self: Sized,

Composes this subscriber around the given collector, returning a Layered struct implementing Subscribe.

fn with_collector(self, inner: C) -> Layered<Self, C>

where Self: Sized,

Composes this subscriber with the given collector, returning a Layered struct that implements Collect.

fn with_filter<F>(self, filter: F) -> Filtered<Self, F, C>

where Self: Sized, F: Filter<C>,

Available on crate features registry and std only.

Combines self with a Filter, returning a Filtered subscriber.

fn boxed(self) -> Box<dyn Subscribe<C> + Send + Sync + 'static>

where Self: Sized + Subscribe<C> + Send + Sync + 'static, C: Collect,

Available on crate features alloc or std only.

Erases the type of this subscriber, returning a Boxed dyn Subscribe trait object.