Struct freqfs::Cache

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pub struct Cache<FE> { /* private fields */ }
Expand description

An in-memory cache layer over tokio::fs with least-frequently-used (LFU) eviction.

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impl<FE: for<'a> FileSave<'a>> Cache<FE>

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pub fn new(capacity: usize, max_file_handles: Option<usize>) -> Arc<Self>

Initialize the cache.

cleanup_interval specifies how often cache cleanup should run in the background. max_file_handles specifies how many files are allowed to be evicted at once. If not specified, max_file_handles will default to 512.

This function should only be called once.

Panics: if max_file_handles is Some(0)

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pub fn load(self: Arc<Self>, path: PathBuf) -> Result<DirLock<FE>, Error>

Load a filesystem directory into the cache.

After loading, all interactions with files under this directory should go through a DirLock or FileLock.

Auto Trait Implementations§

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impl<FE> !RefUnwindSafe for Cache<FE>

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impl<FE> Send for Cache<FE>
where FE: Send + Sync,

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impl<FE> Sync for Cache<FE>
where FE: Send + Sync,

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impl<FE> Unpin for Cache<FE>

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impl<FE> !UnwindSafe for Cache<FE>

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<F, T> CastFrom<F> for T
where T: From<F>,

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fn cast_from(f: F) -> T

Cast an instance of T into an instance of Self.
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impl<T, F> CastInto<F> for T
where F: CastFrom<T>,

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fn cast_into(self) -> F

Cast an instance of Self into an instance of T.
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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, 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<F> Match for F

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fn matches<T>(&self) -> bool
where T: TryCastFrom<Self>,

Returns true if self can be cast into the target type T.
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impl<F, T> TryCastFrom<F> for T
where T: CastFrom<F>,

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fn can_cast_from(_: &F) -> bool

Test if value can be cast into Self.
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fn opt_cast_from(f: F) -> Option<T>

Returns Some(Self) if the source value can be cast into Self, otherwise None.
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fn try_cast_from<Err, OnErr>(value: T, on_err: OnErr) -> Result<Self, Err>
where OnErr: FnOnce(&T) -> Err,

Returns Ok(Self) if the source value can be cast into Self, otherwise calls on_err.
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impl<F, T> TryCastInto<T> for F
where T: TryCastFrom<F>,

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fn can_cast_into(&self) -> bool

Test if self can be cast into T.
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fn opt_cast_into(self) -> Option<T>

Returns Some(T) if self can be cast into T, otherwise None.
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fn try_cast_into<Err, OnErr>(self, on_err: OnErr) -> Result<T, Err>
where OnErr: FnOnce(&Self) -> Err,

Returns Ok(T) if self can be cast into T, otherwise calls on_err.
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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.