Struct actix_web::web::ThinData

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pub struct ThinData<T>(pub T);
Expand description

Application data wrapper and extractor for cheaply-cloned types.

Similar to the Data wrapper but for Clone/Copy types that are already an Arc internally, share state using some other means when cloned, or is otherwise static data that is very cheap to clone.

Unlike Data, this wrapper clones T during extraction. Therefore, it is the user’s responsibility to ensure that clones of T do actually share the same state, otherwise state may be unexpectedly different across multiple requests.

Note that if your type is literally an Arc<T> then it’s recommended to use the Data::from(arc) conversion instead.

§Examples

use actix_web::{
    web::{self, ThinData},
    App, HttpResponse, Responder,
};

// Use the `ThinData<T>` extractor to access a database connection pool.
async fn index(ThinData(db_pool): ThinData<DbPool>) -> impl Responder {
    // database action ...

    HttpResponse::Ok()
}

let db_pool = DbPool::default();

App::new()
    .app_data(ThinData(db_pool.clone()))
    .service(web::resource("/").get(index))

Tuple Fields§

§0: T

Trait Implementations§

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impl<T> AsMut<T> for ThinData<T>

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

Converts this type into a mutable reference of the (usually inferred) input type.
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impl<T> AsRef<T> for ThinData<T>

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fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.
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impl<T: Clone> Clone for ThinData<T>

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fn clone(&self) -> ThinData<T>

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<T: Debug> Debug for ThinData<T>

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

Formats the value using the given formatter. Read more
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impl<T> Deref for ThinData<T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl<T> DerefMut for ThinData<T>

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fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.
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impl<T: Clone + 'static> FromRequest for ThinData<T>

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type Error = Error

The associated error which can be returned.
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type Future = Ready<Result<ThinData<T>, <ThinData<T> as FromRequest>::Error>>

Future that resolves to a Self. Read more
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fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future

Create a Self from request parts asynchronously.
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fn extract(req: &HttpRequest) -> Self::Future

Create a Self from request head asynchronously. Read more

Auto Trait Implementations§

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impl<T> Freeze for ThinData<T>
where T: Freeze,

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impl<T> RefUnwindSafe for ThinData<T>
where T: RefUnwindSafe,

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impl<T> Send for ThinData<T>
where T: Send,

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impl<T> Sync for ThinData<T>
where T: Sync,

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impl<T> Unpin for ThinData<T>
where T: Unpin,

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impl<T> UnwindSafe for ThinData<T>
where T: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where 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 T
where 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 T
where 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> CloneToUninit for T
where T: Clone,

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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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 T
where 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, P> Resource for T
where T: DerefMut<Target = Path<P>>, P: ResourcePath,

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type Path = P

Type of resource’s path returned in resource_path.
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fn resource_path(&mut self) -> &mut Path<<T as Resource>::Path>

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where 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 T
where 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 T
where 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<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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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
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impl<T> Formattable for T
where T: Deref, <T as Deref>::Target: Formattable,

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impl<T> Parsable for T
where T: Deref, <T as Deref>::Target: Parsable,