Type Alias Formatter

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pub type Formatter<N = DefaultFields, E = Format<Full>, W = fn() -> Stdout> = Layered<Layer<Registry, N, E, W>, Registry>;
Expand description

A Subscriber that logs formatted representations of tracing events. This type only logs formatted events; it does not perform any filtering.

Aliased Type§

struct Formatter<N = DefaultFields, E = Format<Full>, W = fn() -> Stdout> { /* private fields */ }

Implementations

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impl<L, S> Layered<L, S>
where L: Layer<S>, S: Subscriber,

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

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

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

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

Trait Implementations

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

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

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<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<S, A, B> Layer<S> for Layered<A, B, S>
where A: Layer<S>, B: Layer<S>, S: Subscriber,

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fn on_register_dispatch(&self, subscriber: &Dispatch)

Performs late initialization when installing this layer as a Subscriber. Read more
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fn on_layer(&mut self, subscriber: &mut S)

Performs late initialization when attaching a Layer to a Subscriber. Read more
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fn register_callsite(&self, metadata: &'static Metadata<'static>) -> Interest

Registers a new callsite with this layer, returning whether or not the layer is interested in being notified about the callsite, similarly to Subscriber::register_callsite. Read more
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fn enabled(&self, metadata: &Metadata<'_>, ctx: Context<'_, S>) -> bool

Returns true if this layer is interested in a span or event with the given metadata in the current Context, similarly to Subscriber::enabled. Read more
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fn on_new_span(&self, attrs: &Attributes<'_>, id: &Id, ctx: Context<'_, S>)

Notifies this layer 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<'_, S>)

Notifies this layer 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<'_, S>)

Notifies this layer 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<'_, S>) -> 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<'_, S>)

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

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

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

Notifies this layer 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<'_, S>)

Notifies this layer that a span ID has been cloned, and that the subscriber returned a different ID.
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fn and_then<L>(self, layer: L) -> Layered<L, Self, S>
where L: Layer<S>, Self: Sized,

Composes this layer around the given Layer, returning a Layered struct implementing Layer. Read more
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fn with_subscriber(self, inner: S) -> Layered<Self, S>
where Self: Sized,

Composes this Layer with the given Subscriber, returning a Layered struct that implements Subscriber. Read more
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fn with_filter<F>(self, filter: F) -> Filtered<Self, F, S>
where Self: Sized, F: Filter<S>,

Combines self with a Filter, returning a Filtered layer. Read more
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fn boxed(self) -> Box<dyn Layer<S> + Send + Sync + 'static>
where Self: Sized + Layer<S> + Send + Sync + 'static, S: Subscriber,

Erases the type of this Layer, returning a Boxed dyn Layer trait object. Read more
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impl<'a, L, S> LookupSpan<'a> for Layered<L, S>
where S: Subscriber + LookupSpan<'a>,

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type Data = <S 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

Registers a Filter for per-layer filtering with this Subscriber. Read more
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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. Read more
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impl<L, S> Subscriber for Layered<L, S>
where L: Layer<S>, S: Subscriber,

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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. 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 Subscriber will enable, or None, if the subscriber 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 subscriber 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 Subscriber::try_close instead
This method is deprecated. Read more
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fn try_close(&self, id: Id) -> bool

Notifies the subscriber 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 subscriber’s view of the current span. Read more
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fn on_register_dispatch(&self, subscriber: &Dispatch)

Invoked when this subscriber becomes a Dispatch. Read more
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unsafe fn downcast_raw(&self, id: TypeId) -> Option<*const ()>

If self is the same type as the provided TypeId, returns an untyped *const pointer to that type. Otherwise, returns None. Read more