pub struct Attributes<'a> { /* private fields */ }
Expand description

Attributes provided to a Subscriber describing a new span when it is created.

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impl<'a> Attributes<'a>

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pub fn new( metadata: &'static Metadata<'static>, values: &'a ValueSet<'a> ) -> Self

Returns Attributes describing a new child span of the current span, with the provided metadata and values.

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pub fn new_root( metadata: &'static Metadata<'static>, values: &'a ValueSet<'a> ) -> Self

Returns Attributes describing a new span at the root of its own trace tree, with the provided metadata and values.

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pub fn child_of( parent: Id, metadata: &'static Metadata<'static>, values: &'a ValueSet<'a> ) -> Self

Returns Attributes describing a new child span of the specified parent span, with the provided metadata and values.

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pub fn metadata(&self) -> &'static Metadata<'static>

Returns a reference to the new span’s metadata.

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pub fn values(&self) -> &ValueSet<'a>

Returns a reference to a ValueSet containing any values the new span was created with.

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pub fn is_root(&self) -> bool

Returns true if the new span should be a root.

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pub fn is_contextual(&self) -> bool

Returns true if the new span’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 span’s parent. Otherwise, if the current thread is not inside a span, then the new span will be the root of its own trace tree.

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pub fn parent(&self) -> Option<&Id>

Returns the new span’s explicitly-specified parent, if there is one.

Otherwise (if the new span is a root or is a child of the current span), returns None.

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pub fn record(&self, visitor: &mut dyn Visit)

Records all the fields in this set of Attributes with the provided Visitor.

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pub fn contains(&self, field: &Field) -> bool

Returns true if this set of Attributes contains a value for the given Field.

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pub fn is_empty(&self) -> bool

Returns true if this set of Attributes contains no values.

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pub fn fields(&self) -> &FieldSet

Returns the set of all fields defined by this span’s Metadata.

Note that the FieldSet returned by this method includes all the fields declared by this span, not just those with values that are recorded as part of this set of Attributes. Other fields with values not present in this Attributes’ value set may record values later.

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impl<'a> Debug for Attributes<'a>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'a> !RefUnwindSafe for Attributes<'a>

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impl<'a> !Send for Attributes<'a>

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impl<'a> !Sync for Attributes<'a>

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impl<'a> Unpin for Attributes<'a>

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impl<'a> !UnwindSafe for Attributes<'a>

Blanket Implementations§

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

const: unstable · source§

fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

const: unstable · source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.