Class MomentoChatMessageHistory

A class that stores chat message history using Momento Cache. It interacts with a Momento cache client to perform operations like fetching, adding, and deleting messages.

Hierarchy

BaseListChatMessageHistory
- MomentoChatMessageHistory

Index

Methods

addAIChatMessage addMessage addUserMessage clear getMessages toJSON toJSONNotImplemented fromProps

Methods

addAIChatMessage

addAIChatMessage(message): Promise<void>
Parameters
- message: string
Returns Promise<void>
Inherited from BaseListChatMessageHistory.addAIChatMessage
- Defined in langchain/src/schema/index.ts:894

addMessage

addMessage(message): Promise<void>
Adds a message to the cache.
Parameters
- message: BaseMessage
  
  The BaseMessage instance to add to the cache.
Returns Promise<void>
A Promise that resolves when the message has been added.
Overrides BaseListChatMessageHistory.addMessage
- Defined in langchain/src/stores/message/momento.ts:144

addUserMessage

addUserMessage(message): Promise<void>
Parameters
- message: string
Returns Promise<void>
Inherited from BaseListChatMessageHistory.addUserMessage
- Defined in langchain/src/schema/index.ts:890

clear

clear(): Promise<void>
Deletes all messages from the cache.

Returns Promise<void>
A Promise that resolves when all messages have been deleted.
- Defined in langchain/src/stores/message/momento.ts:168

getMessages

getMessages(): Promise<BaseMessage[]>
Fetches messages from the cache.

Returns Promise<BaseMessage[]>
A Promise that resolves to an array of BaseMessage instances.
- Defined in langchain/src/stores/message/momento.ts:118

toJSON

toJSON(): Serialized
Returns Serialized
Inherited from BaseListChatMessageHistory.toJSON
- Defined in langchain/src/load/serializable.ts:147

toJSONNotImplemented

toJSONNotImplemented(): SerializedNotImplemented
Returns SerializedNotImplemented
Inherited from BaseListChatMessageHistory.toJSONNotImplemented
- Defined in langchain/src/load/serializable.ts:221

`Static` fromProps

fromProps(props): Promise<MomentoChatMessageHistory>
Create a new chat message history backed by Momento.
Parameters
- props: MomentoChatMessageHistoryProps
  
  The settings to instantiate the Momento chat message history.
Returns Promise<MomentoChatMessageHistory>
A new chat message history backed by Momento.

Throws
If props.sessionTtl is not strictly positive.
- Defined in langchain/src/stores/message/momento.ts:94

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