Struct NoopTracer

pub struct NoopTracer { /* private fields */ }

A no-op instance of a Tracer.

Implementations

impl NoopTracer

pub fn new() -> NoopTracer

Create a new no-op tracer

Trait Implementations

impl Clone for NoopTracer

fn clone(&self) -> NoopTracer

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for NoopTracer

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

Formats the value using the given formatter.

impl Default for NoopTracer

fn default() -> NoopTracer

Returns the “default value” for a type.

impl Tracer for NoopTracer

fn build_with_context( &self, _builder: SpanBuilder, parent_cx: &Context, ) -> <NoopTracer as Tracer>::Span

Builds a NoopSpan from a SpanBuilder.

If the span builder or the context’s current span contains a valid span context, it is propagated.

type Span = NoopSpan

The Span type used by this tracer.

fn start<T>(&self, name: T) -> Self::Span

where T: Into<Cow<'static, str>>,

Starts a new Span.

fn start_with_context<T>(&self, name: T, parent_cx: &Context) -> Self::Span

where T: Into<Cow<'static, str>>,

Starts a new Span with a given context.

fn span_builder<T>(&self, name: T) -> SpanBuilder

where T: Into<Cow<'static, str>>,

Creates a span builder.

fn build(&self, builder: SpanBuilder) -> Self::Span

Start a Span from a SpanBuilder.

fn in_span<T, F, N>(&self, name: N, f: F) -> T

where F: FnOnce(Context) -> T, N: Into<Cow<'static, str>>, Self::Span: Send + Sync + 'static,

Start a new span and execute the given closure with reference to the context in which the span is active.