Struct kernel::trace::collect::NoCollector

pub struct NoCollector(());

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.

Tuple Fields

0: ()

Implementations

impl NoCollector

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

impl Clone for NoCollector

fn clone(&self) -> NoCollector

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Collect for NoCollector

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.

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

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

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

Records that an Event has occurred.

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

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

fn current_span(&self) -> Current

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

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 on_register_dispatch(&self, collector: &Dispatch)

Invoked when this collector becomes a Dispatch.

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

Determine if an Event should be recorded.

fn clone_span(&self, id: &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.

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 Debug for NoCollector

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

Formats the value using the given formatter.

impl Default for NoCollector

fn default() -> NoCollector

Returns the “default value” for a type.

impl Copy for NoCollector