OpenAI Function Call Java Example

From the project: https://github.com/HamaWhiteGG/langchain-java

Please refer to the ChatFunctionTest for the complete test code.

1. Core main process

  • Generates a ChatParameter instance that represents the given class.
  • Invoke the OpenAI API and return the function name and parameters.
  • Execute functions through the FunctionExecutor.

2. Step-by-step introduction

2.1 Declare function parameters and response

java 复制代码
public record Weather(
        @JsonProperty(required = true)
        @JsonPropertyDescription("The city and state, e.g. San Francisco, CA")
        String location,

        @JsonPropertyDescription("The temperature unit")
        WeatherUnit unit
) {}


public enum WeatherUnit {

    CELSIUS,
    FAHRENHEIT
}


@Data
@Builder
public class WeatherResponse {

    public String location;

    public WeatherUnit unit;

    public int temperature;

    public String description;
}


WeatherResponse getCurrentWeather(Weather weather) {
    // mock function
    return WeatherResponse.builder()
            .location(weather.location())
            .unit(weather.unit())
            .temperature(new Random().nextInt(50))
            .description("sunny")
            .build();
}

2.2 Generates a ChatParameter instance that represents the given class

Automatically convert Weather.class to ChatParameter using the ChatParameterUtils.generate method.

java 复制代码
ChatFunction.ChatParameter chatParameter = ChatParameterUtils.generate(Weather.class);

The output of converting chatParameter to JSON String is as follows:

json 复制代码
{
    "type" : "object",
    "properties" : {
        "location" : {
            "type" : "string",
            "description" : "The city and state, e.g. San Francisco, CA"
        },
        "unit" : {
            "type" : "string",
            "description" : "The temperature unit",
            "enum" : [
                "celsius",
                "fahrenheit"
            ]
        }
    },
    "required" : [
        "location"
    ]
}

2.3 Invoke the OpenAI API and return the function name and parameters.

java 复制代码
ChatFunction chatFunction = ChatFunction.builder()
        .name(functionName)
        .description("Get the current weather in a given location")
        .parameters(ChatParameterUtils.generate(Weather.class))
        .build();

Message message = Message.of("What is the weather like in Boston?");

ChatCompletion chatCompletion = ChatCompletion.builder()
        .model("gpt-4")
        .temperature(0)
        .messages(List.of(message))
        .tools(List.of(new Tool(chatFunction)))
        .toolChoice("auto")
        .build();

ChatCompletionResp response = client.createChatCompletion(chatCompletion);
ChatChoice chatChoice = response.getChoices().get(0);

The output of converting chatChoice to JSON String is as follows:

json 复制代码
{
    "index":0,
    "message":{
        "role":"assistant",
        "content":null,
        "tool_calls":[
            {
                "id":"call_aS4LspVVBkE8uIiBSLZWXe6O",
                "type":"function",
                "function":{
                    "name":"get_current_weather",
                    "arguments":"{\n  \"location\": \"Boston, MA\"\n}"
                }
            }
        ]
    },
    "finish_reason":"tool_calls"
}

2.4 Execute functions through the FunctionExecutor.

The code for FunctionExecutor is as follows, allowing the caller to avoid explicit type casting through generics, making the code more concise and elegant.

java 复制代码
public class FunctionExecutor {

    private static final Map<String, Function<?, ?>> FUNCTION_MAP = new HashMap<>(16);

    public static <T> void register(String functionName, Function<T, ?> function) {
        FUNCTION_MAP.put(functionName, function);
    }

    @SuppressWarnings("unchecked")
    public static <T, R> R execute(String functionName, Class<T> clazz, String arguments) throws ClassCastException {
        Function<T, R> function = (Function<T, R>) FUNCTION_MAP.get(functionName);
        if (function == null) {
            throw new IllegalArgumentException("No function registered with name: " + functionName);
        }
        T input = convertFromJsonStr(arguments, clazz);
        return function.apply(input);
    }
}

The caller's code is as follows:

java 复制代码
Function function = chatChoice.getMessage().getToolCalls().get(0).getFunction();

// execute function
WeatherResponse weatherResponse = FunctionExecutor.execute(function.getName(), Weather.class, function.getArguments());
System.out.println(weatherResponse)

The final result is:

shell 复制代码
WeatherResponse(location=Boston, MA, unit=null, temperature=2, description=sunny)
相关推荐
老马啸西风几秒前
maven 发布到中央仓库常用脚本-02
java·maven
代码的余温1 分钟前
MyBatis集成Logback日志全攻略
java·tomcat·mybatis·logback
一只叫煤球的猫1 小时前
【🤣离谱整活】我写了一篇程序员掉进 Java 异世界的短篇小说
java·后端·程序员
斐波娜娜1 小时前
Maven详解
java·开发语言·maven
Bug退退退1232 小时前
RabbitMQ 高级特性之事务
java·分布式·spring·rabbitmq
程序员秘密基地2 小时前
基于html,css,vue,vscode,idea,,java,springboot,mysql数据库,在线旅游,景点管理系统
java·spring boot·mysql·spring·web3
皮皮林5512 小时前
自从用了CheckStyle插件,代码写的越来越规范了....
java
小码氓2 小时前
Java填充Word模板
java·开发语言·spring·word
会飞的天明2 小时前
Java 导出word 实现饼状图导出--可编辑数据
java·word
Muxiyale2 小时前
使用spring发送邮件,部署ECS服务器
java·服务器·spring