EntryKeySelector

wb_cache::entry_selector

Struct EntryKeySelector 

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pub struct EntryKeySelector<DC>
where
    DC: DataController,
{ /* private fields */ }

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impl<DC> EntryKeySelector<DC>
where DC: DataController,

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pub fn primary_key(&self) -> &Option<DC::Key>

Contains the primary key for existing entries.

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pub fn key(&self) -> &DC::Key

The key for which this selector is created.

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pub fn primary(&self) -> bool

True if this is a primary key selector, false if it is a secondary key selector.

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impl<DC> EntryKeySelector<DC>
where DC: DataController,

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pub async fn and_try_compute_with<F, Fut>( self, callback: F, ) -> Result<CompResult<DC>, Arc<DC::Error>>
where F: FnOnce(Option<Entry<DC>>) -> Fut, Fut: Future<Output = Result<Op<DC::Value>, DC::Error>>,

Performs a compute operation on the entry identified by the key. If the entry is not cached yet the controller will try to pull it from the backend via its data controller. If the entry is not found, the callback will be called with None.

The callback should return a Result<Op<DC::Value>, DC::Error>, where Op will instruct the controller how to use the returned value.

Returns a result of the operation if it succeeds or an error.

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pub async fn or_try_insert_with<F>( self, init: F, ) -> Result<Entry<DC>, Arc<DC::Error>>
where F: Future<Output = Result<DC::Value, DC::Error>>,

Returns an Entry for the requested key if it’s either cached or can be fetched from the backend. Otherwise uses the give init future to create a new entry.

Trait Implementations§

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impl<DC> Child for EntryKeySelector<DC>
where DC: DataController,

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type WeakParent = Weak<Cache<DC>>

Type of weak reference to the parent.
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type FXPParent = Arc<Cache<DC>>

For use of the child_build! and child_builder! macros.
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type RcParent = Arc<Cache<DC>>

Type of strong reference to the parent.
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fn parent(&self) -> Self::RcParent

Return a strong reference to the parent.
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fn parent_downgrade(&self) -> Self::WeakParent

Return a weak reference to the parent.
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fn __fxplus_parent(parent: Self::WeakParent) -> Self::FXPParent

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impl<DC> Debug for EntryKeySelector<DC>
where DC: DataController,

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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<DC> FXStruct for EntryKeySelector<DC>
where DC: DataController,

Auto Trait Implementations§

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impl<DC> Freeze for EntryKeySelector<DC>
where <DC as DataController>::Key: Freeze,

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impl<DC> !RefUnwindSafe for EntryKeySelector<DC>

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impl<DC> Send for EntryKeySelector<DC>

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impl<DC> Sync for EntryKeySelector<DC>

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impl<DC> Unpin for EntryKeySelector<DC>
where <DC as DataController>::Key: Unpin,

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impl<DC> !UnwindSafe for EntryKeySelector<DC>

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