pub struct Event<'a> { /* private fields */ }Expand description
Events represent single points in time where something occurred during the
execution of a program.
An Event can be compared to a log record in unstructured logging, but with
two key differences:
Events exist within the context of a span. Unlike log lines, they may be located within the trace tree, allowing visibility into the temporal context in which the event occurred, as well as the source code location.- Like spans,
Events have structured key-value data known as fields, which may include textual message. In general, a majority of the data associated with an event should be in the event’s fields rather than in the textual message, as the fields are more structured.
Implementations
sourceimpl<'a> Event<'a>
impl<'a> Event<'a>
sourcepub fn dispatch(metadata: &'static Metadata<'static>, fields: &'a ValueSet<'_>)
pub fn dispatch(metadata: &'static Metadata<'static>, fields: &'a ValueSet<'_>)
Constructs a new Event with the specified metadata and set of values,
and observes it with the current subscriber.
sourcepub fn new(
metadata: &'static Metadata<'static>,
fields: &'a ValueSet<'a>
) -> Event<'a>
pub fn new(
metadata: &'static Metadata<'static>,
fields: &'a ValueSet<'a>
) -> Event<'a>
Returns a new Event in the current span, with the specified metadata
and set of values.
sourcepub fn new_child_of(
parent: impl Into<Option<Id>>,
metadata: &'static Metadata<'static>,
fields: &'a ValueSet<'a>
) -> Event<'a>
pub fn new_child_of(
parent: impl Into<Option<Id>>,
metadata: &'static Metadata<'static>,
fields: &'a ValueSet<'a>
) -> Event<'a>
Returns a new Event as a child of the specified span, with the
provided metadata and set of values.
sourcepub fn child_of(
parent: impl Into<Option<Id>>,
metadata: &'static Metadata<'static>,
fields: &'a ValueSet<'_>
)
pub fn child_of(
parent: impl Into<Option<Id>>,
metadata: &'static Metadata<'static>,
fields: &'a ValueSet<'_>
)
Constructs a new Event with the specified metadata and set of values,
and observes it with the current subscriber and an explicit parent.
sourcepub fn record(&self, visitor: &mut dyn Visit)
pub fn record(&self, visitor: &mut dyn Visit)
Visits all the fields on this Event with the specified visitor.
sourcepub fn fields(&self) -> IterⓘNotable traits for Iterimpl Iterator for Iter type Item = Field;
pub fn fields(&self) -> IterⓘNotable traits for Iterimpl Iterator for Iter type Item = Field;
Returns an iterator over the set of values on this Event.
sourcepub fn is_contextual(&self) -> bool
pub fn is_contextual(&self) -> bool
Returns true if the new event’s parent should be determined based on the current context.
If this is true and the current thread is currently inside a span, then that span should be the new event’s parent. Otherwise, if the current thread is not inside a span, then the new event will be the root of its own trace tree.
Trait Implementations
Auto Trait Implementations
impl<'a> !RefUnwindSafe for Event<'a>
impl<'a> !Send for Event<'a>
impl<'a> !Sync for Event<'a>
impl<'a> Unpin for Event<'a>
impl<'a> !UnwindSafe for Event<'a>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcepub fn borrow_mut(&mut self) -> &mut T
pub fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> Instrument for T
impl<T> Instrument for T
sourcefn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T: Future> Future for Instrumented<T> type Output = T::Output;
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>impl<T: Future> Future for Instrumented<T> type Output = T::Output;
Instruments this type with the provided Span, returning an
Instrumented wrapper. Read more