InMemoryVectorStore class final

Holds vectors in memory and scans them exhaustively.

final store = InMemoryVectorStore(dimensions: 3);
await store.upsertOne(VectorRecord(
  id: 'doc-1',
  vector: [0.1, 0.9, 0.0],
  text: 'Dart supports pattern matching.',
  metadata: {'lang': 'dart'},
));

final hits = await store.searchVector(
  [0.1, 0.8, 0.1],
  filter: MetadataFilter.equals('lang', 'dart'),
);
Implemented types
Available extensions

Constructors

InMemoryVectorStore({required int dimensions, SimilarityMetric metric = SimilarityMetric.cosine, int? maxRecords, String name = 'in-memory'})
Creates an empty index of fixed width.
InMemoryVectorStore.fromJson(JsonMap json)
Restores a store from snapshot.
factory

Properties

hashCode → int
The hash code for this object.
no setterinherited
info → VectorStoreInfo
What this store is.
final
length → int
How many records are held across every namespace.
no setter
maxRecords → int?
Upper bound on records held across all namespaces, or null for none.
final
namespaces → Iterable<String>
The namespaces that currently hold anything.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

checkDimensions(List<VectorRecord> records) → void

Available on VectorStore, provided by the VectorStoreOperations extension

Validates records against this store's dimensions.
checkNamespace(String? namespace) → void

Available on VectorStore, provided by the VectorStoreOperations extension

Validates namespace against this store's capabilities.
clear({String? namespace}) → Future<void>
Removes everything in namespace, or everywhere when it is null.
override
count({String? namespace, MetadataFilter? filter}) → Future<int>
How many records are stored, optionally restricted by filter.
override
delete(Iterable<String> ids, {String? namespace}) → Future<int>
Removes the records with ids, returning how many existed.
override
deleteOne(String id, {String? namespace}) → Future<bool>

Available on VectorStore, provided by the VectorStoreOperations extension

Removes one record, returning whether it existed.
deleteWhere(MetadataFilter filter, {String? namespace}) → Future<int>
Removes every record matching filter, returning how many were removed.
override
dispose() → Future<void>
Releases every resource held by this object.
exists(String id, {String? namespace}) → Future<bool>

Available on VectorStore, provided by the VectorStoreOperations extension

Whether a record with id exists.
get(String id, {String? namespace}) → Future<VectorRecord?>
Returns the record with id, or null.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
Returns the records nearest to query.
override
searchVector(List<double> vector, {int topK = 8, MetadataFilter? filter, double minScore = 0, bool includeVectors = false, String? namespace, AgenticContext? context}) → Future<List<VectorMatch>>

Available on VectorStore, provided by the VectorStoreOperations extension

Searches with a raw vector.
snapshot() → JsonMap
Serialises the whole index, vectors included.
toString() → String
A string representation of this object.
override
upsert(List<VectorRecord> records, {String? namespace, AgenticContext? context}) → Future<void>
Inserts or replaces records.
override
upsertAll(Iterable<VectorRecord> records, {String? namespace, AgenticContext? context}) → Future<int>

Available on VectorStore, provided by the VectorStoreOperations extension

Upserts records in batches of VectorStoreInfo.maxUpsertBatch.
upsertOne(VectorRecord record, {String? namespace, AgenticContext? context}) → Future<void>

Available on VectorStore, provided by the VectorStoreOperations extension

Upserts a single record.

Operators

operator ==(Object other) → bool
The equality operator.
inherited