Struct Id

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

An identifier for flows and async spans.

Implementations

impl Id

pub fn new() -> Id

Creates a new Id. Ids created by separate calls to new in the same process are guaranteed to be distinct.

WARNING: Id::new is likely to hit the UI bug where UIs group async durations with the same trace id but different process ids. Use Id::random instead. (Until https://fxbug.dev/42054669 is fixed.)

pub fn random() -> Id

Creates a new Id based on the current montonic time and a random u16 to, with high probability, avoid the bug where UIs group async durations with the same trace id but different process ids. Id::new is likely to hit the UI bug because it (per process) generates trace ids consecutively starting from 1. https://cs.opensource.google/fuchsia/fuchsia/+/main:zircon/system/ulib/trace-engine/nonce.cc;l=15-17;drc=b1c2f508a59e6c87c617852ed3e424693a392646 TODO(https://fxbug.dev/42054669) Delete this and migrate clients to Id::new once UIs stop grouping async durations with the same trace id but different process ids.

Trait Implementations

impl Clone for Id

fn clone(&self) -> Id

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Id

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

Formats the value using the given formatter.

impl From<u64> for Id

fn from(u: u64) -> Id

Converts to this type from the input type.

impl Hash for Id

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Id

fn cmp(&self, other: &Id) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Id

fn eq(&self, other: &Id) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Id

fn partial_cmp(&self, other: &Id) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Id

impl Eq for Id

impl StructuralPartialEq for Id