Trait SpanGroup 

pub trait SpanGroup {
    type Id;

    // Required method
    fn group(&self, span: &Attributes<'_>) -> Self::Id;
}

Translate attributes from a tracing span into a timing span group.

All spans whose attributes produce the same Id-typed value when passed through group share a namespace for the groups produced by EventGroup::group on their contained events.

This trait is implemented for all functions with the appropriate signature. Note that you may run into weird lifetime errors from the compiler when using a closure as a SpanGroup. This is a known compiler issue. You can work around it by adding a slight type hint to the arguments passed to the closure as follows (note the : &_):

use tracing_timing::{Builder, Histogram};
use tracing::span;
let s = Builder::default()
    .spans(|_: &span::Attributes| "all spans as one")
    .build(|| Histogram::new(3).unwrap());

Required Associated Types

type Id

The type of the timing span group.

Required Methods

fn group(&self, span: &Attributes<'_>) -> Self::Id

Extract the group for this span’s attributes.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl SpanGroup for ByField

type Id = String

impl SpanGroup for ByName

type Id = &'static str

impl SpanGroup for ByTarget

type Id = &'static str

impl<F, R> SpanGroup for F

where F: Fn(&Attributes<'_>) -> R,

type Id = R