Struct Observations 

pub struct Observations(/* private fields */);

Available on crate feature inspect only.

An append-only observation scope. Clones share observations; independent scopes keep connection, exchange and upstream data separate.

Implementations

impl Observations

pub fn get_ref<T>(&self) -> Option<&T>

where T: Extension,

pub fn contains<T>(&self) -> bool

where T: Extension,

pub fn insert<T>(&self, value: T) -> &T

where T: Extension,

Retain the first value for this type. Existing observations are never replaced.

pub fn get_or_insert<T>(&self, create: impl FnOnce() -> T) -> &T

where T: Extension,

Initialize an observation once, including when concurrent streams first encounter the same connection. The initializer must not insert recursively.

Trait Implementations

impl Clone for Observations

fn clone(&self) -> Observations

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Observations

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

Formats the value using the given formatter.

impl Default for Observations

fn default() -> Observations

Returns the “default value” for a type.