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

Struct tracing::collect::NoCollector

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pub struct NoCollector(/* private fields */);
Expand description

A no-op collector.

NoCollector implements the Collect trait by never being enabled, never being interested in any callsite, and drops all spans and events.

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impl NoCollector

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pub const fn new() -> NoCollector

Returns a new NoCollector instance.

This function is equivalent to calling NoCollector::default(), but this is usable in const fn contexts.

Trait Implementations§

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impl Clone for NoCollector

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fn clone(&self) -> NoCollector

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 Collect for NoCollector

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

Records that an Event has occurred. 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 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 current_span(&self) -> Current

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

Invoked when this collector becomes a Dispatch. 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 event_enabled(&self, event: &Event<'_>) -> bool

Determine if an Event should be recorded. Read more
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fn clone_span(&self, id: &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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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 Debug for NoCollector

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

Formats the value using the given formatter. Read more
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impl Default for NoCollector

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fn default() -> NoCollector

Returns the “default value” for a type. Read more
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impl Copy for NoCollector

Auto Trait Implementations§

Blanket Implementations§

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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> 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> 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>,

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

Available on crate feature std only.
Attaches the current default collector to this type, returning a WithDispatch wrapper. Read more