pub struct Handle<L, S> { /* private fields */ }
Expand description

Allows reloading the state of an associated Layer.

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impl<L, S> Handle<L, S>where L: Layer<S> + 'static, S: Subscriber,

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pub fn reload(&self, new_layer: impl Into<L>) -> Result<(), Error>

Replace the current layer with the provided new_layer.

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pub fn modify(&self, f: impl FnOnce(&mut L)) -> Result<(), Error>

Invokes a closure with a mutable reference to the current layer, allowing it to be modified in place.

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pub fn clone_current(&self) -> Option<L>where L: Clone,

Returns a clone of the layer’s current value if it still exists. Otherwise, if the subscriber has been dropped, returns None.

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pub fn with_current<T>(&self, f: impl FnOnce(&L) -> T) -> Result<T, Error>

Invokes a closure with a borrowed reference to the current layer, returning the result (or an error if the subscriber no longer exists).

Trait Implementations§

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impl<L, S> Clone for Handle<L, S>

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<L: Debug, S: Debug> Debug for Handle<L, S>

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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<L, S> !RefUnwindSafe for Handle<L, S>

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impl<L, S> Send for Handle<L, S>where L: Send + Sync,

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impl<L, S> Sync for Handle<L, S>where L: Send + Sync,

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impl<L, S> Unpin for Handle<L, S>

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impl<L, S> !UnwindSafe for Handle<L, S>

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,

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fn borrow(&self) -> &T

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

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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

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere U: From<T>,

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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> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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.
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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.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more