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ArrayMemtable

nodedb_lite::engine::array::memtable

Struct ArrayMemtable 

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

In-memory write buffer for a single array.

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impl ArrayMemtable

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pub fn new() -> Self

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pub fn put_cell( &mut self, schema: &ArraySchema, args: PutCellArgs, ) -> Result<TileId, LiteError>

Insert a cell. Creates a new tile-version for the given system_from_ms.

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pub fn delete_cell( &mut self, schema: &ArraySchema, coord: Vec<CoordValue>, system_from_ms: i64, ) -> Result<TileId, LiteError>

Append a tombstone version for (coord, system_from_ms).

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pub fn erase_cell( &mut self, schema: &ArraySchema, coord: Vec<CoordValue>, system_from_ms: i64, ) -> Result<TileId, LiteError>

Append a GDPR erasure sentinel for (coord, system_from_ms).

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pub fn stats(&self) -> MemtableStats

Total cell count (live cells only, sentinels excluded).

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pub fn is_empty(&self) -> bool

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pub fn tiles_iter(&self) -> impl Iterator<Item = TileId> + '_

Iterate all tile IDs currently stored (used for prefix enumeration).

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pub fn drain_and_materialise( &mut self, schema: &ArraySchema, ) -> Result<Vec<(TileId, SparseTile)>, LiteError>

Drain tiles sorted by TileId and materialise each into a SparseTile.

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pub fn iter_cell_versions( &self, hilbert_prefix: u64, system_as_of: i64, coord: &[CoordValue], ) -> Vec<(TileId, Vec<u8>)>

Iterate memtable tile versions for hilbert_prefix at or before system_as_of, newest-first. Returns (TileId, raw_cell_bytes) for the requested coord.

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pub fn iter_tiles_for_prefix( &self, hilbert_prefix: u64, system_as_of: i64, schema: &ArraySchema, ) -> Result<Vec<(TileId, SparseTile)>, LiteError>

Iterate all tile versions for hilbert_prefix at or before system_as_of returning (TileId, SparseTile) — used by slice queries.

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impl ArrayMemtable

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pub fn drain_all_tiles_read_only( &self, system_as_of: i64, schema: &ArraySchema, ) -> Result<Vec<(TileId, SparseTile)>, LiteError>

Read-only snapshot of all tile-version entries at or before system_as_of, materialised as SparseTiles.

Trait Implementations§

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impl Debug for ArrayMemtable

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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 Default for ArrayMemtable

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fn default() -> Self

Returns the “default value” for a type. Read more

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