This Spring Boot application demonstrates the implementation of function callbacks using OpenAI's API and Spring AI. The app simulates weather information retrieval for different cities using a mock weather service.

Overview

The application showcases how to:

Integrate OpenAI's function calling capabilities with Spring Boot
Handle weather-related queries using a mock weather service
Process and respond to natural language requests for weather information

Components

Main Application (SpringAiJavaFunctionCallbackApplication)

The main application class contains:

Spring Boot configuration
Command line runner for demo execution
Mock weather service implementation
Temperature unit enumeration (Celsius/Fahrenheit)

Weather Request (WeatherRequest)

Data model for weather requests with the following fields:

location: City and state (e.g., "San Francisco, CA")
lat: Latitude coordinate
lon: Longitude coordinate
unit: Temperature unit (C/F)

Weather Response (WeatherResponse)

Data model for weather information containing:

temp: Current temperature
feels_like: "Feels like" temperature
temp_min: Minimum temperature
temp_max: Maximum temperature
pressure: Atmospheric pressure
humidity: Humidity percentage
unit: Temperature unit (C/F)

Mock Weather Service

The mock service provides simulated weather data for three cities:

San Francisco (30.0°C)
Tokyo (10.0°C)
Paris (15.0°C)

Usage Example

The application demonstrates usage through a command line runner:

ChatResponse response = chatClient
.prompt("What are the weather conditions in San Francisco, Tokyo, and Paris?")
.functions("WeatherInfo")
.call()
.chatResponse();

Dependencies

The project uses Maven for dependency management. All required dependencies are included in the pom.xml file:

Spring Boot Starter (spring-boot-starter)
Spring AI OpenAI Starter (spring-ai-openai-spring-boot-starter)
Spring Boot Starter Test (spring-boot-starter-test)
Jackson libraries for JSON processing
Other Spring framework dependencies For the exact versions and complete list of dependencies, please refer to the pom.xml file in the project root.

Setup

Clone the repository Set your OpenAI API key in the application configuration:

openai.api.key=your_api_key_here

Run the application using:

./mvnw spring-boot:run

Notes

This is a demonstration application using mock data
Real implementation would require integration with actual weather APIs
Temperature values are hardcoded for demonstration purposes