Segment

Struct Segment 

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

セグメントファイル

固定長のメモリマップドファイルでイベントを格納。 高速なシーケンシャル書き込みとランダムアクセス読み取りを提供。

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impl Segment

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pub fn create<P: AsRef<Path>>(file_path: P, size: u64) -> StorageResult<Self>

新しいセグメントを作成

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pub fn open<P: AsRef<Path>>( file_path: P, read_only: bool, ) -> StorageResult<Self>

既存のセグメントファイルを開く

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pub fn append_event(&mut self, event: &Event) -> StorageResult<Offset>

イベントをセグメントに書き込み

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pub fn read_event(&self, offset: Offset) -> StorageResult<Option<Event>>

指定したオフセットのイベントを読み取り

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pub fn read_events_range( &self, start_offset: Offset, max_events: usize, ) -> StorageResult<Vec<Event>>

指定した範囲のイベントを読み取り

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pub fn flush(&mut self) -> StorageResult<()>

セグメントをフラッシュ

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pub fn stats(&self) -> SegmentStats

セグメントの統計情報を取得

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pub fn append_batch_data( &mut self, batch_data: &[u8], event_sizes: &[usize], ) -> StorageResult<Offset>

バッチデータを一括書き込み(高性能版)

§Arguments
  • batch_data - シリアライズされたバッチデータ
  • event_sizes - 各イベントのサイズリスト
§Returns
  • StorageResult<Offset> - 開始オフセット
§Performance

複数イベントを一回のI/Oで書き込み、1M+ events/secを実現

Trait Implementations§

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impl Debug for Segment

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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> Any for T
where T: 'static + ?Sized,

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where T: ?Sized,

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fn borrow(&self) -> &T

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

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impl<T> From<T> for T

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fn from(t: T) -> T

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impl<T> Instrument for T

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

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type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

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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>,

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