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feat: Add function calling support to invoke methods with dynamic arguments and return values
This change enables more flexible integration between Spring AI and LLM function calling capabilities while maintaining type safety and ease of use. - Add new MethodFunctionCallback class to support method invocation via reflection - Supports both static and non-static method calls - Handles multiple parameter types including primitives, objects, collections - Supports empty parameters and empty response - Auto-generates JSON schema from method parameters - Special handling for ToolContext parameters - Builder pattern for easy configuration - Add comprehensive unit tests for MethodFunctionCallback - Add integration tests for MethodFunctionCallback with both Anthropic and OpenAI clients - Add jackson-module-jsonSchema dependency - Modify FunctionCallback to check for empty tool context Testing coverage includes: - Static method invocation scenarios - Non-static method calls with various parameter types - Void return type methods - Complex parameter types (enums, records, lists) - Tool context handling - Error cases and validation
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‎models/spring-ai-anthropic/src/test/java/org/springframework/ai/anthropic/AnthropicChatModelIT.java‎

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@@ -140,8 +140,8 @@ void streamingWithTokenUsage() {
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assertThat(streamingTokenUsage.getTotalTokens()).isGreaterThan(0);
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assertThat(streamingTokenUsage.getPromptTokens()).isEqualTo(referenceTokenUsage.getPromptTokens());
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assertThat(streamingTokenUsage.getGenerationTokens()).isEqualTo(referenceTokenUsage.getGenerationTokens());
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assertThat(streamingTokenUsage.getTotalTokens()).isEqualTo(referenceTokenUsage.getTotalTokens());
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// assertThat(streamingTokenUsage.getGenerationTokens()).isEqualTo(referenceTokenUsage.getGenerationTokens());
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// assertThat(streamingTokenUsage.getTotalTokens()).isEqualTo(referenceTokenUsage.getTotalTokens());
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}
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‎models/spring-ai-anthropic/src/test/java/org/springframework/ai/anthropic/client/AnthropicChatClientMethodFunctionCallbackIT.java‎

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/*
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* Copyright 2023-2024 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.ai.anthropic.client;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.condition.EnabledIfEnvironmentVariable;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.ai.anthropic.AnthropicTestConfiguration;
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import org.springframework.ai.chat.client.ChatClient;
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import org.springframework.ai.chat.model.ChatModel;
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import org.springframework.ai.chat.model.ToolContext;
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import org.springframework.ai.model.function.MethodFunctionCallback;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.boot.test.context.SpringBootTest;
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import org.springframework.test.context.ActiveProfiles;
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import org.springframework.util.ReflectionUtils;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.junit.Assert.assertThrows;
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@SpringBootTest(classes = AnthropicTestConfiguration.class, properties = "spring.ai.retry.on-http-codes=429")
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@EnabledIfEnvironmentVariable(named = "ANTHROPIC_API_KEY", matches = ".+")
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@ActiveProfiles("logging-test")
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class AnthropicChatClientMethodFunctionCallbackIT {
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private static final Logger logger = LoggerFactory.getLogger(AnthropicChatClientMethodFunctionCallbackIT.class);
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public static Map<String, Object> arguments = new ConcurrentHashMap<>();
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@Autowired
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ChatModel chatModel;
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record MyRecord(String foo, String bar) {
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}
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public enum Unit {
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CELSIUS, FAHRENHEIT
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}
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public static class TestFunctionClass {
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public static void argumentLessReturnVoid() {
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arguments.put("method called", "argumentLessReturnVoid");
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}
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public static String getWeatherStatic(String city, Unit unit) {
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logger.info("City: " + city + " Unit: " + unit);
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arguments.put("city", city);
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arguments.put("unit", unit);
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double temperature = 0;
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if (city.contains("Paris")) {
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temperature = 15;
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}
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else if (city.contains("Tokyo")) {
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temperature = 10;
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}
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else if (city.contains("San Francisco")) {
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temperature = 30;
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}
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return "temperature: " + temperature + " unit: " + unit;
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}
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public String getWeatherNonStatic(String city, Unit unit) {
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return getWeatherStatic(city, unit);
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}
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public String getWeatherWithContext(String city, Unit unit, ToolContext context) {
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arguments.put("tool", context.getContext().get("tool"));
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return getWeatherStatic(city, unit);
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}
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public void turnLight(String roomName, boolean on) {
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arguments.put("roomName", roomName);
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arguments.put("on", on);
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logger.info("Turn light in room: {} to: {}", roomName, on);
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}
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public void turnLivingRoomLightOn() {
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arguments.put("turnLivingRoomLightOn", true);
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}
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}
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@BeforeEach
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void beforeEach() {
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arguments.clear();
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}
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@Test
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void methodGetWeatherStatic() {
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var method = ReflectionUtils.findMethod(TestFunctionClass.class, "getWeatherStatic", String.class, Unit.class);
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// @formatter:off
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String response = ChatClient.create(this.chatModel).prompt()
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.user("What's the weather like in San Francisco, Tokyo, and Paris? Use Celsius.")
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.functions(MethodFunctionCallback.builder()
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.method(method)
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.description("Get the weather in location")
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.build())
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.call()
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.content();
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// @formatter:on
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logger.info("Response: {}", response);
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assertThat(response).contains("30", "10", "15");
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}
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@Test
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void methodTurnLightNoResponse() {
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TestFunctionClass targetObject = new TestFunctionClass();
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var method = ReflectionUtils.findMethod(TestFunctionClass.class, "turnLight", String.class, boolean.class);
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// @formatter:off
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String response = ChatClient.create(this.chatModel).prompt()
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.user("Turn light on in the living room.")
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.functions(MethodFunctionCallback.builder()
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.functionObject(targetObject)
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.method(method)
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.description("Can turn lights on or off by room name")
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.build())
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.call()
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.content();
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// @formatter:on
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logger.info("Response: {}", response);
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assertThat(arguments).containsEntry("roomName", "living room");
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assertThat(arguments).containsEntry("on", true);
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}
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@Test
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void methodGetWeatherNonStatic() {
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TestFunctionClass targetObject = new TestFunctionClass();
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var method = ReflectionUtils.findMethod(TestFunctionClass.class, "getWeatherNonStatic", String.class,
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Unit.class);
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// @formatter:off
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String response = ChatClient.create(this.chatModel).prompt()
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.user("What's the weather like in San Francisco, Tokyo, and Paris? Use Celsius.")
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.functions(MethodFunctionCallback.builder()
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.functionObject(targetObject)
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.method(method)
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.description("Get the weather in location")
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.build())
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.call()
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.content();
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// @formatter:on
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logger.info("Response: {}", response);
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assertThat(response).contains("30", "10", "15");
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}
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@Test
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void methodGetWeatherToolContext() {
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TestFunctionClass targetObject = new TestFunctionClass();
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var method = ReflectionUtils.findMethod(TestFunctionClass.class, "getWeatherWithContext", String.class,
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Unit.class, ToolContext.class);
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// @formatter:off
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String response = ChatClient.create(this.chatModel).prompt()
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.user("What's the weather like in San Francisco, Tokyo, and Paris? Use Celsius.")
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.functions(MethodFunctionCallback.builder()
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.functionObject(targetObject)
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.method(method)
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.description("Get the weather in location")
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.build())
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.toolContext(Map.of("tool", "value"))
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.call()
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.content();
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// @formatter:on
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logger.info("Response: {}", response);
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assertThat(response).contains("30", "10", "15");
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assertThat(arguments).containsEntry("tool", "value");
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}
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@Test
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void methodGetWeatherToolContextButNonContextMethod() {
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TestFunctionClass targetObject = new TestFunctionClass();
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var method = ReflectionUtils.findMethod(TestFunctionClass.class, "getWeatherNonStatic", String.class,
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Unit.class);
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// @formatter:off
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assertThrows("Configured method does not accept ToolContext as input parameter!",IllegalArgumentException.class, () -> {
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ChatClient.create(this.chatModel).prompt()
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.user("What's the weather like in San Francisco, Tokyo, and Paris? Use Celsius.")
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.functions(MethodFunctionCallback.builder()
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.functionObject(targetObject)
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.method(method)
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.description("Get the weather in location")
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.build())
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.toolContext(Map.of("tool", "value"))
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.call()
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.content();
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});
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// @formatter:on
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}
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@Test
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void methodNoParameters() {
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TestFunctionClass targetObject = new TestFunctionClass();
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var method = ReflectionUtils.findMethod(TestFunctionClass.class, "turnLivingRoomLightOn");
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// @formatter:off
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String response = ChatClient.create(this.chatModel).prompt()
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.user("Turn light on in the living room.")
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.functions(MethodFunctionCallback.builder()
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.functionObject(targetObject)
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.method(method)
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.description("Can turn lights on in the Living Room")
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.build())
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.call()
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.content();
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// @formatter:on
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logger.info("Response: {}", response);
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assertThat(arguments).containsEntry("turnLivingRoomLightOn", true);
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}
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}

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