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BufferPool

Struct BufferPool 

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

SSTable データブロック用の LRU バッファプール。

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impl BufferPool

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pub fn new(config: BufferPoolConfig) -> Self

新しい BufferPool を作成する。

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pub fn current_size_bytes(&self) -> usize

現在の使用量(バイト、概算ではなく実測)。

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pub fn capacity_bytes(&self) -> usize

容量(バイト)。

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pub fn stats(&self) -> BufferPoolStatsSnapshot

統計を取得する。

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pub fn get(&self, id: &BlockId) -> Option<Arc<DataBlock>>

ブロックを取得する(ヒット時は LRU を更新)。

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pub fn put(&self, id: BlockId, block: Arc<DataBlock>) -> bool

ブロックを追加する(容量超過時は LRU でエビクション)。

戻り値:

  • true: キャッシュに格納した
  • false: ブロックが容量より大きく、キャッシュしなかった
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pub fn evict_one(&self) -> Option<(BlockId, Arc<DataBlock>)>

明示的に LRU で 1 件エビクトする(エビクトできなければ None)。

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impl Debug for BufferPool

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

Formats the value using the given formatter. Read more

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