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tracing-core: add documentation on DefaultCallsite #2149

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Jun 6, 2022
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tracing-core: add documentation on DefaultCallsite #2149

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18 changes: 18 additions & 0 deletions tracing-core/src/callsite.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,22 @@
//! configuration changes infrequently, it may be more efficient than calling
//! [`Subscriber::enabled`] frequently.
//!
//! # Implementing Callsites
//!
//! In most cases, instrumenting code using `tracing` should *not* require
//! implementing the [`Callsite`] trait directly. When using the [`tracing`
//! crate's macros][macros] or the [`#[instrument]` attribute][instrument], a
//! `Callsite` is automatically generated.
//!
//! However, code which provides alternative forms of `tracing` instrumentation
//! may need to interact with the callsite system directly. If
//! instrumentation-side code needs to produce a `Callsite` to emit spans or
//! events, the [`DefaultCallsite`] struct provided in this module is a
//! ready-made `Callsite` implementation that is suitable for most uses. When
//! possible, the use of `DefaultCallsite` should be preferred over implementing
//! [`Callsite`] for user types, as `DefaultCallsite` may benefit from
//! additional performance optimizations.
//!
//! [^1]: Returned by the [`Subscriber::register_callsite`][`register_callsite`]
//! method.
//!
Expand All @@ -80,6 +96,8 @@
//! [sometimes]: crate::subscriber::Interest::sometimes
//! [never]: crate::subscriber::Interest::never
//! [`Dispatch`]: crate::dispatch::Dispatch
//! [macros]: https://docs.rs/tracing/latest/tracing/#macros
//! [instrument]: https://docs.rs/tracing/latest/tracing/attr.instrument.html
use crate::stdlib::{
any::TypeId,
fmt,
Expand Down