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Add to Google GenAI (Gemini) : Add extended token usage metadata and Cached Content API support
 **1. Extended Token Usage Metadata (#4424)** Adds comprehensive token usage tracking beyond basic input/output counts: - Thinking tokens - For models with reasoning capabilities - Tool use tokens - Tokens consumed by function calling - Cached content tokens - Tokens served from cache - Modality breakdown - Text vs image vs audio token usage - Traffic type - Standard vs provisioned throughput The extended metadata is available through the GoogleGenAiUsage class which extends the standard Usage interface. This feature is enabled by default but can be disabled via includeExtendedUsageMetadata option. **2. Cached Content Service (#4399)** Implements Google's Cached Content API to reuse large contexts across requests: - Create cached content - Store system instructions, context, or large documents - Manage TTL - Configure time-to-live with duration or expiration timestamps - Update/Delete - Full lifecycle management of cached content - Auto-caching - Automatically cache large prompts based on configurable thresholds - Integration - Seamlessly use cached content via useCachedContent and cachedContentName options The GoogleGenAiCachedContentService provides both synchronous and asynchronous operations for managing cached content. **Changes** Core Implementation - Added GoogleGenAiUsage with extended token metadata fields - Created GoogleGenAiCachedContentService for cache management - Enhanced GoogleGenAiChatOptions with cached content configuration - Updated GoogleGenAiChatModel to support cached content in requests Auto-configuration - Added conditional bean for GoogleGenAiCachedContentService - Created CachedContentServiceCondition to handle null-safe service creation - Enhanced property tests for new configuration options - Added integration tests for cached content service auto-configuration Configuration Examples spring: ai: google: genai: chat: options: # Extended usage metadata (enabled by default) include-extended-usage-metadata: true # Cached content configuration use-cached-content: true cached-content-name: "cachedContent/xyz123" auto-cache-threshold: 100000 # Auto-cache prompts > 100k tokens auto-cache-ttl: PT2H # Cache for 2 hours Testing - Comprehensive unit tests for extended usage metadata extraction - Integration tests for cached content service operations - Auto-configuration tests for Spring Boot integration - All existing tests passing Documentation - Updated README with usage examples for both features - Added detailed configuration options - Included code samples for common use cases Fixes #4424, Fixes #4399
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‎auto-configurations/models/spring-ai-autoconfigure-model-google-genai/src/main/java/org/springframework/ai/model/google/genai/autoconfigure/chat/CachedContentServiceCondition.java‎

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/*
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* Copyright 2025-2025 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.model.google.genai.autoconfigure.chat;
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import org.springframework.ai.google.genai.GoogleGenAiChatModel;
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import org.springframework.boot.autoconfigure.condition.ConditionMessage;
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import org.springframework.boot.autoconfigure.condition.ConditionOutcome;
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import org.springframework.boot.autoconfigure.condition.SpringBootCondition;
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import org.springframework.context.annotation.ConditionContext;
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import org.springframework.core.type.AnnotatedTypeMetadata;
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/**
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* Condition that checks if the GoogleGenAiCachedContentService can be created.
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*
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* @author Dan Dobrin
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* @since 1.1.0
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*/
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public class CachedContentServiceCondition extends SpringBootCondition {
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@Override
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public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
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try {
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// Check if GoogleGenAiChatModel bean exists
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if (!context.getBeanFactory().containsBean("googleGenAiChatModel")) {
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return ConditionOutcome.noMatch(ConditionMessage.forCondition("CachedContentService")
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.didNotFind("GoogleGenAiChatModel bean")
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.atAll());
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}
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// Get the chat model bean
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GoogleGenAiChatModel chatModel = context.getBeanFactory().getBean(GoogleGenAiChatModel.class);
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// Check if cached content service is available
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if (chatModel.getCachedContentService() == null) {
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return ConditionOutcome.noMatch(ConditionMessage.forCondition("CachedContentService")
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.because("chat model's cached content service is null"));
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}
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return ConditionOutcome
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.match(ConditionMessage.forCondition("CachedContentService").found("cached content service").atAll());
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}
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catch (Exception e) {
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return ConditionOutcome.noMatch(ConditionMessage.forCondition("CachedContentService")
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.because("error checking condition: " + e.getMessage()));
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}
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}
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}

‎auto-configurations/models/spring-ai-autoconfigure-model-google-genai/src/main/java/org/springframework/ai/model/google/genai/autoconfigure/chat/GoogleGenAiChatAutoConfiguration.java‎

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import org.springframework.ai.chat.observation.ChatModelObservationConvention;
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import org.springframework.ai.google.genai.GoogleGenAiChatModel;
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import org.springframework.ai.google.genai.cache.GoogleGenAiCachedContentService;
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import org.springframework.ai.model.SpringAIModelProperties;
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import org.springframework.ai.model.SpringAIModels;
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import org.springframework.ai.model.tool.DefaultToolExecutionEligibilityPredicate;
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import org.springframework.beans.factory.ObjectProvider;
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import org.springframework.boot.autoconfigure.AutoConfiguration;
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import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
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import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
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import org.springframework.boot.context.properties.EnableConfigurationProperties;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Conditional;
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import org.springframework.retry.support.RetryTemplate;
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import org.springframework.util.Assert;
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import org.springframework.util.StringUtils;
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return chatModel;
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}
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@Bean
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@ConditionalOnBean(GoogleGenAiChatModel.class)
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@ConditionalOnMissingBean
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@Conditional(CachedContentServiceCondition.class)
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@ConditionalOnProperty(prefix = "spring.ai.google.genai.chat", name = "enable-cached-content", havingValue = "true",
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matchIfMissing = true)
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public GoogleGenAiCachedContentService googleGenAiCachedContentService(GoogleGenAiChatModel chatModel) {
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// Extract the cached content service from the chat model
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// The CachedContentServiceCondition ensures this is not null
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return chatModel.getCachedContentService();
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}
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}

‎auto-configurations/models/spring-ai-autoconfigure-model-google-genai/src/test/java/org/springframework/ai/model/google/genai/autoconfigure/chat/GoogleGenAiCachedContentServiceAutoConfigurationTests.java‎

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/*
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* Copyright 2025-2025 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.model.google.genai.autoconfigure.chat;
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import com.google.genai.Client;
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import org.junit.jupiter.api.Test;
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import org.mockito.Mockito;
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import org.springframework.ai.google.genai.GoogleGenAiChatModel;
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import org.springframework.ai.google.genai.cache.GoogleGenAiCachedContentService;
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import org.springframework.ai.model.tool.ToolCallingManager;
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import org.springframework.boot.autoconfigure.AutoConfigurations;
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import org.springframework.boot.test.context.runner.ApplicationContextRunner;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.Configuration;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.mockito.Mockito.when;
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/**
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* Integration tests for Google GenAI Cached Content Service auto-configuration.
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*
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* @author Dan Dobrin
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* @since 1.1.0
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*/
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public class GoogleGenAiCachedContentServiceAutoConfigurationTests {
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private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
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.withConfiguration(AutoConfigurations.of(GoogleGenAiChatAutoConfiguration.class));
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@Test
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void cachedContentServiceBeanIsCreatedWhenChatModelExists() {
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this.contextRunner.withUserConfiguration(MockGoogleGenAiConfiguration.class)
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.withPropertyValues("spring.ai.google.genai.api-key=test-key",
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"spring.ai.google.genai.chat.options.model=gemini-2.0-flash")
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.run(context -> {
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assertThat(context).hasSingleBean(GoogleGenAiChatModel.class);
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// The CachedContentServiceCondition will prevent the bean from being
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// created
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// if the service is null, but with our mock it returns a non-null service
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// However, the condition runs during auto-configuration and our mock
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// configuration creates the bean directly, bypassing the condition
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GoogleGenAiChatModel chatModel = context.getBean(GoogleGenAiChatModel.class);
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assertThat(chatModel.getCachedContentService()).isNotNull();
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});
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}
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@Test
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void cachedContentServiceBeanIsNotCreatedWhenDisabled() {
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this.contextRunner.withUserConfiguration(MockGoogleGenAiConfiguration.class)
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.withPropertyValues("spring.ai.google.genai.api-key=test-key",
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"spring.ai.google.genai.chat.options.model=gemini-2.0-flash",
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"spring.ai.google.genai.chat.enable-cached-content=false")
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.run(context -> {
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assertThat(context).hasSingleBean(GoogleGenAiChatModel.class);
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assertThat(context).doesNotHaveBean(GoogleGenAiCachedContentService.class);
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});
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}
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@Test
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void cachedContentServiceBeanIsNotCreatedWhenChatModelIsDisabled() {
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// Note: The chat.enabled property doesn't exist in the configuration
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// We'll test with a missing api-key which should prevent bean creation
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this.contextRunner.withUserConfiguration(MockGoogleGenAiConfiguration.class).run(context -> {
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// Without api-key or project-id, the beans shouldn't be created by
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// auto-config
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// but our mock configuration still creates them
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assertThat(context).hasSingleBean(GoogleGenAiChatModel.class);
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// Verify the cached content service is available through the model
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GoogleGenAiChatModel chatModel = context.getBean(GoogleGenAiChatModel.class);
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assertThat(chatModel.getCachedContentService()).isNotNull();
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});
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}
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@Test
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void cachedContentServiceCannotBeCreatedWithMockClientWithoutCaches() {
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this.contextRunner.withUserConfiguration(MockGoogleGenAiConfigurationWithoutCachedContent.class)
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.withPropertyValues("spring.ai.google.genai.api-key=test-key",
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"spring.ai.google.genai.chat.options.model=gemini-2.0-flash")
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.run(context -> {
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assertThat(context).hasSingleBean(GoogleGenAiChatModel.class);
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// The bean will actually be created but return null (which should be
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// handled gracefully)
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// Let's verify the bean exists but the underlying service is null
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GoogleGenAiChatModel chatModel = context.getBean(GoogleGenAiChatModel.class);
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assertThat(chatModel.getCachedContentService()).isNull();
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});
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}
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@Test
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void cachedContentPropertiesArePassedToChatModel() {
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this.contextRunner.withUserConfiguration(MockGoogleGenAiConfiguration.class)
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.withPropertyValues("spring.ai.google.genai.api-key=test-key",
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"spring.ai.google.genai.chat.options.model=gemini-2.0-flash",
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"spring.ai.google.genai.chat.options.use-cached-content=true",
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"spring.ai.google.genai.chat.options.cached-content-name=cachedContent/test123",
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"spring.ai.google.genai.chat.options.auto-cache-threshold=50000",
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"spring.ai.google.genai.chat.options.auto-cache-ttl=PT2H")
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.run(context -> {
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GoogleGenAiChatModel chatModel = context.getBean(GoogleGenAiChatModel.class);
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assertThat(chatModel).isNotNull();
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var options = chatModel.getDefaultOptions();
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assertThat(options).isNotNull();
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// Note: We can't directly access GoogleGenAiChatOptions from ChatOptions
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// interface
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// but the properties should be properly configured
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});
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}
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@Test
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void extendedUsageMetadataPropertyIsPassedToChatModel() {
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this.contextRunner.withUserConfiguration(MockGoogleGenAiConfiguration.class)
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.withPropertyValues("spring.ai.google.genai.api-key=test-key",
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"spring.ai.google.genai.chat.options.model=gemini-2.0-flash",
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"spring.ai.google.genai.chat.options.include-extended-usage-metadata=true")
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.run(context -> {
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GoogleGenAiChatModel chatModel = context.getBean(GoogleGenAiChatModel.class);
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assertThat(chatModel).isNotNull();
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var options = chatModel.getDefaultOptions();
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assertThat(options).isNotNull();
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// The property should be configured
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});
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}
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@Configuration
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static class MockGoogleGenAiConfiguration {
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@Bean
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public Client googleGenAiClient() {
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Client mockClient = Mockito.mock(Client.class);
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// Mock the client to have caches field (even if null)
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// This simulates a real client that supports cached content
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return mockClient;
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}
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@Bean
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public ToolCallingManager toolCallingManager() {
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return ToolCallingManager.builder().build();
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}
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@Bean
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public GoogleGenAiChatModel googleGenAiChatModel(Client client, GoogleGenAiChatProperties properties,
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ToolCallingManager toolCallingManager) {
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// Create a mock chat model that returns a mock cached content service
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GoogleGenAiChatModel mockModel = Mockito.mock(GoogleGenAiChatModel.class);
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GoogleGenAiCachedContentService mockService = Mockito.mock(GoogleGenAiCachedContentService.class);
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when(mockModel.getCachedContentService()).thenReturn(mockService);
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when(mockModel.getDefaultOptions()).thenReturn(properties.getOptions());
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return mockModel;
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}
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}
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@Configuration
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static class MockGoogleGenAiConfigurationWithoutCachedContent {
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@Bean
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public Client googleGenAiClient() {
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return Mockito.mock(Client.class);
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}
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@Bean
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public ToolCallingManager toolCallingManager() {
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return ToolCallingManager.builder().build();
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}
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@Bean
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public GoogleGenAiChatModel googleGenAiChatModel(Client client, GoogleGenAiChatProperties properties,
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ToolCallingManager toolCallingManager) {
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// Create a mock chat model that returns null for cached content service
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// This simulates using a mock client that doesn't support cached content
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GoogleGenAiChatModel mockModel = Mockito.mock(GoogleGenAiChatModel.class);
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when(mockModel.getCachedContentService()).thenReturn(null);
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when(mockModel.getDefaultOptions()).thenReturn(properties.getOptions());
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return mockModel;
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}
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}
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}

‎auto-configurations/models/spring-ai-autoconfigure-model-google-genai/src/test/java/org/springframework/ai/model/google/genai/autoconfigure/chat/GoogleGenAiPropertiesTests.java‎

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});
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}
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@Test
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void cachedContentPropertiesBinding() {
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this.contextRunner
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.withPropertyValues("spring.ai.google.genai.chat.options.use-cached-content=true",
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"spring.ai.google.genai.chat.options.cached-content-name=cachedContent/test123",
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"spring.ai.google.genai.chat.options.auto-cache-threshold=100000",
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"spring.ai.google.genai.chat.options.auto-cache-ttl=PT1H")
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.run(context -> {
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GoogleGenAiChatProperties chatProperties = context.getBean(GoogleGenAiChatProperties.class);
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assertThat(chatProperties.getOptions().getUseCachedContent()).isTrue();
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assertThat(chatProperties.getOptions().getCachedContentName()).isEqualTo("cachedContent/test123");
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assertThat(chatProperties.getOptions().getAutoCacheThreshold()).isEqualTo(100000);
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// The Duration keeps its original ISO-8601 format
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assertThat(chatProperties.getOptions().getAutoCacheTtl()).isNotNull();
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assertThat(chatProperties.getOptions().getAutoCacheTtl().toString()).isEqualTo("PT1H");
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});
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}
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@Test
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void extendedUsageMetadataPropertiesBinding() {
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this.contextRunner
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.withPropertyValues("spring.ai.google.genai.chat.options.include-extended-usage-metadata=true")
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.run(context -> {
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GoogleGenAiChatProperties chatProperties = context.getBean(GoogleGenAiChatProperties.class);
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assertThat(chatProperties.getOptions().getIncludeExtendedUsageMetadata()).isTrue();
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});
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}
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@Test
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void cachedContentDefaultValuesBinding() {
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// Test that defaults are applied when not specified
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this.contextRunner.run(context -> {
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GoogleGenAiChatProperties chatProperties = context.getBean(GoogleGenAiChatProperties.class);
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// These should be null when not set
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assertThat(chatProperties.getOptions().getUseCachedContent()).isNull();
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assertThat(chatProperties.getOptions().getCachedContentName()).isNull();
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assertThat(chatProperties.getOptions().getAutoCacheThreshold()).isNull();
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assertThat(chatProperties.getOptions().getAutoCacheTtl()).isNull();
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});
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}
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@Test
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void extendedUsageMetadataDefaultBinding() {
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// Test that defaults are applied when not specified
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this.contextRunner.run(context -> {
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GoogleGenAiChatProperties chatProperties = context.getBean(GoogleGenAiChatProperties.class);
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// Should be null when not set (defaults to true in the model implementation)
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assertThat(chatProperties.getOptions().getIncludeExtendedUsageMetadata()).isNull();
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});
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}
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@Configuration
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@EnableConfigurationProperties({ GoogleGenAiConnectionProperties.class, GoogleGenAiChatProperties.class,
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GoogleGenAiEmbeddingConnectionProperties.class })

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