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EngineId

nodedb_lite

Enum EngineId 

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pub enum EngineId {

Show 15 variants    Vector,
    Graph,
    DocumentSchemaless,
    DocumentStrict,
    Kv,
    Columnar,
    Timeseries,
    Spatial,
    Array,
    Fts,
    Sparse,
    Crdt,
    Query,
    Wal,
    Bridge,

}
Expand description

Identifies a subsystem that owns a memory budget.

Each engine operates within its allocated memory ceiling. The governor tracks allocations per engine and rejects requests that would exceed the budget.

Covers all eight peer engines (Document schemaless, Document strict, KV, Columnar, Timeseries, Spatial, Vector, Array), plus the two cross-engine overlays (Graph, Fts), plus infrastructure subsystems (Sparse metadata, Crdt, Query, Wal, Bridge).

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Vector

HNSW vector index, distance computation buffers, quantized caches.

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Graph

CSR adjacency index, traversal algorithm working sets (cross-engine overlay).

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DocumentSchemaless

Document (schemaless): MessagePack blobs, secondary index buffers.

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DocumentStrict

Document (strict): Binary Tuple encode/decode buffers, schema metadata.

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Kv

Key-Value engine: hash index buckets, TTL expiry wheel.

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Columnar

Columnar engine: compressed segment build buffers, block statistics.

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Timeseries

Gorilla-encoded memtables, Zstd dictionaries, log buffers.

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Spatial

R*-tree node pools, geohash / H3 index structures.

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Array

Array engine (ND sparse): tile decompression buffers, coordinate arrays.

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Fts

FTS LSM memtable, posting lists, compaction merge buffers (cross-engine overlay).

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Sparse

redb B-Tree, splintr inverted index, schema metadata (sparse/metadata engine).

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Crdt

loro CRDT state, merge buffers, operation logs.

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Query

DataFusion query execution: sorts, aggregates, hash tables.

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Wal

WAL write buffers, group commit staging.

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Bridge

SPSC bridge buffers, slab allocator, envelope staging.

Implementations§

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impl EngineId

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pub const ALL: &'static [EngineId]

All known engine identifiers (for iteration in the governor).

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pub const COUNT: usize

Number of known engine identifiers.

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pub const fn index(self) -> usize

Dense array index for this engine, for use with fixed-size per-engine arrays sized EngineId::COUNT.

EngineId is a fieldless enum, so the discriminant cast matches the declaration position, and ALL lists variants in that same order — the inline test below locks the two together.

Trait Implementations§

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impl Clone for EngineId

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fn clone(&self) -> EngineId

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 Copy for EngineId

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impl Debug for EngineId

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

Formats the value using the given formatter. Read more
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impl Display for EngineId

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

Formats the value using the given formatter. Read more
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impl Eq for EngineId

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impl Hash for EngineId

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fn hash<__H>(&self, state: &mut __H)
where __H: Hasher,

Feeds this value into the given Hasher. Read more
1.3.0 · Source§

fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl PartialEq for EngineId

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fn eq(&self, other: &EngineId) -> bool

Equality operator ==. Read more
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=. Read more
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impl StructuralPartialEq for EngineId

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impl<T> Allocation for T
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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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type ArchivedMetadata = ()

The archived version of the pointer metadata for this type.
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Converts some archived metadata to the pointer metadata for itself.
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Immutably borrows from an owned value. Read more
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