Class WeaviateEmbeddingStore

java.lang.Object

dev.langchain4j.store.embedding.weaviate.WeaviateEmbeddingStore

All Implemented Interfaces:

EmbeddingStore<TextSegment>

public class WeaviateEmbeddingStore
extends Object
implements EmbeddingStore<TextSegment>

Represents the Weaviate vector database. Current implementation assumes the cosine distance metric is used.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	WeaviateEmbeddingStore.WeaviateEmbeddingStoreBuilder

Constructor Summary

Constructors

Constructor	Description
WeaviateEmbeddingStore(String apiKey, String scheme, String host, Integer port, Boolean useGrpcForInserts, Boolean securedGrpc, Integer grpcPort, String objectClass, Boolean avoidDups, String consistencyLevel, Collection<String> metadataKeys, String textFieldName, String metadataFieldName)	Creates a new WeaviateEmbeddingStore instance.

Method Summary

Modifier and Type	Method	Description
String	add(Embedding embedding)
String	add(Embedding embedding, TextSegment textSegment)
void	add(String id, Embedding embedding)	Adds a new embedding with provided ID to the store.
List<String>	addAll(List<Embedding> embeddings)
void	addAll(List<String> ids, List<Embedding> embeddings, List<TextSegment> embedded)
static WeaviateEmbeddingStore.WeaviateEmbeddingStoreBuilder	builder()
void	removeAll()
void	removeAll(Collection<String> ids)
EmbeddingSearchResult<TextSegment>	search(EmbeddingSearchRequest request)	The score inside EmbeddingMatch is Weaviate's certainty.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface EmbeddingStore

addAll, generateIds, remove, removeAll

Constructor Details

WeaviateEmbeddingStore

public WeaviateEmbeddingStore(String apiKey,
 String scheme,
 String host,
 Integer port,
 Boolean useGrpcForInserts,
 Boolean securedGrpc,
 Integer grpcPort,
 String objectClass,
 Boolean avoidDups,
 String consistencyLevel,
 Collection<String> metadataKeys,
 String textFieldName,
 String metadataFieldName)

Creates a new WeaviateEmbeddingStore instance.

Parameters:

apiKey - Your Weaviate API key. Not required for local deployment.

scheme - The scheme, e.g. "https" of cluster URL. Find in under Details of your Weaviate cluster.

host - The host, e.g. "langchain4j-4jw7ufd9.weaviate.network" of cluster URL. Find in under Details of your Weaviate cluster.

port - The port, e.g. 8080. This parameter is optional.

useGrpcForInserts - Use GRPC instead of HTTP for batch inserts only. You still need HTTP configured for search

securedGrpc - The GRPC connection is secured

grpcPort - The port, e.g. 50051. This parameter is optional.

objectClass - The object class you want to store, e.g. "MyGreatClass". Must start from an uppercase letter.

avoidDups - If true (default), then WeaviateEmbeddingStore will generate a hashed ID based on provided text segment, which avoids duplicated entries in DB. If false, then random ID will be generated.

consistencyLevel - Consistency level: ONE, QUORUM (default) or ALL. Find more details here.

metadataKeys - Metadata keys that should be persisted (optional)

textFieldName - The name of the field that contains the text of a TextSegment. Default is "text".

metadataFieldName - metadataFieldName The name of the field where Metadata entries are stored. Default is "_metadata". If set to empty string, Metadata entries will be stored in the root of the Weaviate object.

Method Details

builder

public static WeaviateEmbeddingStore.WeaviateEmbeddingStoreBuilder builder()

add

public String add(Embedding embedding)

Specified by:

add in interface EmbeddingStore<TextSegment>

add

public void add(String id,
 Embedding embedding)

Adds a new embedding with provided ID to the store.

Specified by:

add in interface EmbeddingStore<TextSegment>

Parameters:

id - the ID of the embedding to add in UUID format, since it's Weaviate requirement. See Weaviate docs and UUID on Wikipedia

embedding - the embedding to add

add

public String add(Embedding embedding,
 TextSegment textSegment)

Specified by:

add in interface EmbeddingStore<TextSegment>

addAll

public List<String> addAll(List<Embedding> embeddings)

Specified by:

addAll in interface EmbeddingStore<TextSegment>

removeAll

public void removeAll(Collection<String> ids)

Specified by:

removeAll in interface EmbeddingStore<TextSegment>

removeAll

public void removeAll()

Specified by:

removeAll in interface EmbeddingStore<TextSegment>

search

public EmbeddingSearchResult<TextSegment> search(EmbeddingSearchRequest request)

The score inside EmbeddingMatch is Weaviate's certainty.

Specified by:

search in interface EmbeddingStore<TextSegment>

addAll

public void addAll(List<String> ids,
 List<Embedding> embeddings,
 List<TextSegment> embedded)

Specified by:

addAll in interface EmbeddingStore<TextSegment>