🛈 Note: This is pre-release documentation for the upcoming tracing 0.2.0 ecosystem.

For the release documentation, please see docs.rs, instead.

tracing_subscriber::subscribe

Struct Layered

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

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

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

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

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

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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.

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

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

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<S, C> Collect for Layered<S, C>
where S: Subscribe<C>, C: Collect,

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

Returns true if a span or event with the specified metadata would be recorded. Read more
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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. Read more
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fn new_span(&self, span: &Attributes<'_>) -> Id

Visit the construction of a new span, returning a new span ID for the span being constructed. Read more
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fn record(&self, span: &Id, values: &Record<'_>)

Record a set of values on a span. Read more
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fn record_follows_from(&self, span: &Id, follows: &Id)

Adds an indication that span follows from the span with the id follows. Read more
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fn event_enabled(&self, event: &Event<'_>) -> bool

Determine if an Event should be recorded. Read more
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fn event(&self, event: &Event<'_>)

Records that an Event has occurred. Read more
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fn enter(&self, span: &Id)

Records that a span has been entered. Read more
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fn exit(&self, span: &Id)

Records that a span has been exited. Read more
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fn clone_span(&self, old: &Id) -> Id

Notifies the collector that a span ID has been cloned. Read more
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fn drop_span(&self, id: Id)

👎Deprecated since 0.1.2: use Collector::try_close instead
This method is deprecated. Read more
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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. Read more
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fn current_span(&self) -> Current

Returns a type representing this collector’s view of the current span. Read more
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fn on_register_dispatch(&self, collector: &Dispatch)

Invoked when this collector becomes a Dispatch. Read more
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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. Read more
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impl<A, B, S> Debug for Layered<A, B, S>
where A: Debug, B: Debug,

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

Formats the value using the given formatter. Read more
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impl<'a, S, C> LookupSpan<'a> for Layered<S, C>
where C: Collect + LookupSpan<'a>,

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

The type of span data stored in this registry.
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fn span_data(&'a self, id: &Id) -> Option<Self::Data>

Returns the SpanData for a given Id, if it exists. Read more
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fn register_filter(&mut self) -> FilterId

Available on crate feature registry only.
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fn span(&'a self, id: &Id) -> Option<SpanRef<'_, Self>>
where Self: Sized,

Returns a SpanRef for the span with the given Id, if it exists. Read more
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impl<C, A, B> Subscribe<C> for Layered<A, B, C>
where A: Subscribe<C>, B: Subscribe<C>, C: Collect,

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fn on_register_dispatch(&self, collector: &Dispatch)

Performs late initialization when installing this subscriber as a collector. Read more
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fn on_subscribe(&mut self, collect: &mut C)

Performs late initialization when attaching a subscriber to a collector. Read more
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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. Read more
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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. Read more
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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.
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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.
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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.
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fn event_enabled(&self, event: &Event<'_>, ctx: Context<'_, C>) -> bool

Called before on_event, to determine if on_event should be called. Read more
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fn on_event(&self, event: &Event<'_>, ctx: Context<'_, C>)

Notifies this subscriber that an event has occurred.
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fn on_enter(&self, id: &Id, ctx: Context<'_, C>)

Notifies this subscriber that a span with the given ID was entered.
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fn on_exit(&self, id: &Id, ctx: Context<'_, C>)

Notifies this subscriber that the span with the given ID was exited.
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fn on_close(&self, id: Id, ctx: Context<'_, C>)

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

Auto Trait Implementations§

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impl<S, I, C> Freeze for Layered<S, I, C>
where S: Freeze, I: Freeze,

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impl<S, I, C> RefUnwindSafe for Layered<S, I, C>

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impl<S, I, C> Send for Layered<S, I, C>
where S: Send, I: Send,

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impl<S, I, C> Sync for Layered<S, I, C>
where S: Sync, I: Sync,

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impl<S, I, C> Unpin for Layered<S, I, C>
where S: Unpin, I: Unpin,

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impl<S, I, C> UnwindSafe for Layered<S, I, C>
where S: UnwindSafe, I: UnwindSafe,

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit #126799)
Performs copy-assignment from self to dst. Read more
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impl<C> CollectExt for C
where C: Collect,

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fn with<S>(self, subscriber: S) -> Layered<S, Self>
where S: Subscribe<Self>, Self: Sized,

Wraps self with the provided subscriber.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> SubscriberInitExt for T
where T: Into<Dispatch>,

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fn set_default(self) -> DefaultGuard

Available on crate feature std only.
Sets self as the default subscriber in the current scope, returning a guard that will unset it when dropped. Read more
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fn try_init(self) -> Result<(), TryInitError>

Attempts to set self as the global default subscriber in the current scope, returning an error if one is already set. Read more
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fn init(self)

Attempts to set self as the global default subscriber in the current scope, panicking if this fails. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithCollector for T

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fn with_collector<C>(self, collector: C) -> WithDispatch<Self>
where C: Into<Dispatch>,

Attaches the provided collector to this type, returning a WithDispatch wrapper. Read more
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fn with_current_collector(self) -> WithDispatch<Self>

Attaches the current default collector to this type, returning a WithDispatch wrapper. Read more