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HistoryCache

Struct HistoryCache 

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pub struct HistoryCache { /* private fields */ }
Expand description

Geordnete Sample-Ablage.

Interner Storage: BTreeMap fuer O(log n) Insert/Lookup und effizienten Range-Iterator.

**** die schreibenden Methoden brauchen weiter &mut self (BTreeMap ist nicht concurrent-safe), aber Stats sind in einem Arc<HistoryCacheStats> parallel verfuegbar — siehe stats.

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impl HistoryCache

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pub fn new_with_kind(kind: HistoryKind, max_samples: usize) -> Self

Erzeugt einen neuen Cache. max_samples ist die obere Grenze: bei KeepAll fuehrt Ueberschreitung zu CapacityExceeded, bei KeepLast zu LRU-Eviction des aeltesten Samples.

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pub fn stats(&self) -> Arc<HistoryCacheStats>

Geteilter Stats-Handle fuer lock-freies Monitoring.

Konsumenten halten einen Arc<HistoryCacheStats> und pollen die Atomics mit Acquire-Ordering. Werte spiegeln immer eine abgeschlossene Cache-Mutation; cross-field-Konsistenz zwischen len und max_sn ist nicht garantiert (Tear-Risiko).

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pub fn new(max_samples: usize) -> Self

Legacy-Konstruktor — erzeugt einen KeepAll-Cache mit harter Kapazitaets-Grenze. Fuer neue Nutzer [new_with_kind] bevorzugen.

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pub fn kind(&self) -> HistoryKind

History-Kind dieses Caches.

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pub fn evicted_count(&self) -> u64

Anzahl per KeepLast-Eviction verworfener Samples seit Start.

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pub fn insert(&mut self, change: CacheChange) -> Result<(), CacheError>

Fuegt ein Change ein.

§Errors
  • CapacityExceeded: nur bei KeepAll, Cache voll.
  • DuplicateSequenceNumber: SN bereits vorhanden.
  • ZeroDepth: KeepLast { depth: 0 }.
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pub fn get(&self, sn: SequenceNumber) -> Option<&CacheChange>

Holt ein Change per SN.

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pub fn remove_up_to(&mut self, sn: SequenceNumber) -> usize

Entfernt alle Changes mit SN ≤ sn. Liefert die Anzahl entfernter Eintraege.

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pub fn iter_range( &self, lo: SequenceNumber, hi: SequenceNumber, ) -> impl Iterator<Item = &CacheChange> + '_

Iteriert in SN-Reihenfolge ueber Changes im Bereich [lo, hi] (beide inklusiv).

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pub fn min_sn(&self) -> Option<SequenceNumber>

Kleinste SN im Cache.

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pub fn max_sn(&self) -> Option<SequenceNumber>

Groesste SN im Cache.

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pub fn len(&self) -> usize

Anzahl Changes.

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pub fn is_empty(&self) -> bool

True wenn keine Changes.

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pub fn capacity(&self) -> usize

Maximale Kapazitaet.

Trait Implementations§

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impl Clone for HistoryCache

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for HistoryCache

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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<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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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. 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, 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> 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.