Struct NoopTracer 

pub struct NoopTracer { /* private fields */ }

Available on crate feature trace only.

A no-op instance of a Tracer.

Implementations

impl NoopTracer

pub fn new() -> Self

Create a new no-op tracer

Trait Implementations

impl Clone for NoopTracer

fn clone(&self) -> NoopTracer

Returns a duplicate 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

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

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

Starts a new NoopSpan with a given context.

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

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

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

Starts a SpanBuilder.

fn build_with_context( &self, _builder: SpanBuilder, parent_cx: &Context, ) -> Self::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 build(&self, builder: SpanBuilder) -> Self::Span

Create a span from a SpanBuilder

fn in_span<T, F>(&self, name: &'static str, f: F) -> T

where F: FnOnce(Context) -> T, Self::Span: Send + Sync + 'static,

Start a new span and execute the given closure with reference to the span’s context.

fn with_span<T, F>(&self, span: Self::Span, f: F) -> T

where F: FnOnce(Context) -> T, Self::Span: Send + Sync + 'static,

Start a new span and execute the given closure with reference to the span’s context.