Struct Span 

pub struct Span { /* private fields */ }

A stretch of the session in progress that a record describes: stamped when it opens, timed on the session’s clock, and recorded when it closes, so everything stamped meanwhile lies inside it.

Implementations

impl Span

pub fn new() -> Option<Self>

Opens a span now, starting the session if there is none. None when recording is off.

pub fn elapsed(&self) -> Option<Duration>

The time since the span opened, on the session’s clock. None when the environment switched sessions since: the span went with its own.

pub fn close<R: Record + Serialize>( self, effect: RecordEffect, record: &R, ) -> bool

Records record, stamped when the span opened: written if the session is kept, as write() is. false when the session the span opened in is gone, or the write failed.

Trait Implementations

impl Debug for Span

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

Formats the value using the given formatter.