Struct tracing_subscriber::fmt::Subscriber

pub struct Subscriber<N = NewRecorder, E = Format<Full>, W = fn() -> Stdout> { /* fields omitted */ }

A Subscriber that logs formatted representations of tracing events.

Methods

impl Subscriber

pub fn builder() -> Builder

Returns a new Builder for configuring a format subscriber.

pub fn new() -> Self

Returns a new format subscriber with the default configuration.

Trait Implementations

impl Default for Subscriber

fn default() -> Self

Returns the "default value" for a type.

impl<N: Debug, E: Debug, W: Debug> Debug for Subscriber<N, E, W>

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

Formats the value using the given formatter.

impl<N, E, W> Subscriber for Subscriber<N, E, W> where
    N: for<'a> NewVisitor<'a> + 'static,
    E: FormatEvent<N> + 'static,
    W: MakeWriter + 'static, 

fn register_callsite(&self, _: &'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.

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

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

fn new_span(&self, attrs: &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(&self, event: &Event)

Records that an [Event] has occurred.

fn enter(&self, id: &Id)

Records that a span has been entered.

fn exit(&self, id: &Id)

Records that a span has been exited.

fn current_span(&self) -> Current

Returns a type representing this subscriber's view of the current span.

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

Notifies the subscriber that a [span ID] has been cloned.

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.

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.

fn drop_span(&self, _id: Id)

Deprecated since 0.1.2:

use Subscriber::try_close instead

This method is soft-deprecated.