Struct Layered

pub struct Layered<S, I, C = I> { /* private fields */ }

A collector composed of a collector wrapped by one or more subscribers.

Implementations

impl<S, C> Layered<S, C>

where S: Subscribe<C>, C: Collect,

pub fn is<T: Any>(&self) -> bool

Returns true if this Collector is the same type as T.

pub fn downcast_ref<T: Any>(&self) -> Option<&T>

Returns some reference to this Collector value if it is of type T, or None if it isn’t.

Trait Implementations

impl<S: Clone, I: Clone, C: Clone> Clone for Layered<S, I, C>

fn clone(&self) -> Layered<S, I, C>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<S, C> Collect for Layered<S, C>

where S: Subscribe<C>, C: Collect,

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

Registers a new callsite with this collector, returning whether or not the collector is interested in being notified about the callsite.

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

Returns true if a span or event with the specified metadata would be recorded.

fn max_level_hint(&self) -> Option<LevelFilter>

Returns the highest verbosity level that this Collector will enable, or None, if the collector does not implement level-based filtering or chooses not to implement this method.

fn new_span(&self, span: &Attributes<'_>) -> Id

Visit the construction of a new span, returning a new span ID for the span being constructed.

fn record(&self, span: &Id, values: &Record<'_>)

Record a set of values on a span.

fn record_follows_from(&self, span: &Id, follows: &Id)

Adds an indication that span follows from the span with the id follows.

fn event_enabled(&self, event: &Event<'_>) -> bool

Determine if an Event should be recorded.

fn event(&self, event: &Event<'_>)

Records that an Event has occurred.

fn enter(&self, span: &Id)

Records that a span has been entered.

fn exit(&self, span: &Id)

Records that a span has been exited.

fn clone_span(&self, old: &Id) -> Id

Notifies the collector that a span ID has been cloned.

fn drop_span(&self, id: Id)

👎Deprecated since 0.1.2: use Collector::try_close instead

This method is deprecated.

fn try_close(&self, id: Id) -> bool

Notifies the collector that a span ID has been dropped, and returns true if there are now 0 IDs that refer to that span.

fn current_span(&self) -> Current

Returns a type representing this collector’s view of the current span.

fn on_register_dispatch(&self, collector: &Dispatch)

Invoked when this collector becomes a Dispatch.

unsafe fn downcast_raw(&self, id: TypeId) -> Option<NonNull<()>>

If self is the same type as the provided TypeId, returns an untyped NonNull pointer to that type. Otherwise, returns None.

impl<A, B, S> Debug for Layered<A, B, S>

where A: Debug, B: Debug,

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

Formats the value using the given formatter.

impl<'a, S, C> LookupSpan<'a> for Layered<S, C>

where C: Collect + LookupSpan<'a>,

type Data = <C as LookupSpan<'a>>::Data

The type of span data stored in this registry.

fn span_data(&'a self, id: &Id) -> Option<Self::Data>

Returns the SpanData for a given Id, if it exists.

fn register_filter(&mut self) -> FilterId

Available on crate feature registry only.

Registers a Filter for per-subscriber filtering with this collector.

fn span(&'a self, id: &Id) -> Option<SpanRef<'a, Self>>

where Self: Sized,

Returns a SpanRef for the span with the given Id, if it exists.

impl<C, A, B> Subscribe<C> for Layered<A, B, C>

where A: Subscribe<C>, B: Subscribe<C>, C: Collect,

fn on_register_dispatch(&self, collector: &Dispatch)

Performs late initialization when installing this subscriber as a collector.

fn on_subscribe(&mut self, collect: &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.