Score LangChain Models

This handler (com.rierino.handler.langchain4j.LangChainModelEventHandler) provides ability to use LangChain models from various providers

Handler Parameters

Parameter	Definition	Example	Default
model.state	Name of the state manager with model configurations	genai_model	-
model.domain	Name of the model domain to include	chat	-

This handler requires the following dependency (as well as LLM provider specific LangChain4J dependencies) added to deployment contents:

implementation (group:'com.rierino.custom', name: 'langchain4j', version:"${rierinoVersion}")

Models

Models used by this event handler are stored in a regular state manager with the following model parameters:

• Class: Java class name for the LLM provider model (e.g. dev.langchain4j.model.openai.OpenAiChatModel)

• Methods: List of methods and their parameters to call for initializing LLM provider model (e.g. { "apiKey": ["TBD"] } )

• Memory: State manager that should serve as the memory for assistants.

• Memory Size: Maximum number of messages to retain in assistant's memory.

Actions

LLMChat

Performs a chat interaction with a target LLM model provider. Event metadata fields applicable for this action are as follows:

Field	Definition	Example	Default
inputElement	Json path for the input in request event payload	message	-
outputElement	Json path for the output in response event payload	output	-

With event metadata parameters as:

Parameter	Definition	Example	Default
model	ID of the model to use	chatgpt_chat	-

Input element can be a text value, or an object in {chat, message} format, where "chat" field includes ID of an ongoing chat for an assistant type use case with memory.

LLMGenerateImage

Performs an image generation with a target LLM model provider. Event metadata fields applicable for this action are as follows:

Field	Definition	Example	Default
inputElement	Json path for the input in request event payload	{prompt: "", imageCount: ""}	-
outputElement	Json path for the output in response event payload	imageBase64	-

With event metadata parameters as:

Parameter	Definition	Example	Default
model	ID of the model to use	dalle_gen	-

LLMEditImage

Performs an image edit with a target LLM model provider. Event metadata fields applicable for this action are as follows:

Field	Definition	Example	Default
inputElement	Json path for the input in request event payload	{prompt: "", image: { revisedPrompt: "", base64Data:"", mimeType: "", url: ""}, mask: ""}	-
outputElement	Json path for the output in response event payload	output	-

With event metadata parameters as:

Parameter	Definition	Example	Default
model	ID of the model to use	dalle_edit	-