Bedrock Converse API

// Cache system message content
ChatResponse response = chatModel.call(
    new Prompt(
        List.of(
            new SystemMessage("You are a helpful AI assistant with extensive knowledge..."),
            new UserMessage("What is machine learning?")
        ),
        BedrockChatOptions.builder()
            .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
            .cacheOptions(BedrockCacheOptions.builder()
                .strategy(BedrockCacheStrategy.SYSTEM_ONLY)
                .build())
            .maxTokens(500)
            .build()
    )
);

// Cache tool definitions only
ChatResponse response = chatModel.call(
    new Prompt(
        "What's the weather in San Francisco?",
        BedrockChatOptions.builder()
            .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
            .cacheOptions(BedrockCacheOptions.builder()
                .strategy(BedrockCacheStrategy.TOOLS_ONLY)
                .build())
            .toolCallbacks(weatherToolCallbacks)  // Large tool definitions
            .maxTokens(500)
            .build()
    )
);

// Cache system message and tool definitions
ChatResponse response = chatModel.call(
    new Prompt(
        List.of(
            new SystemMessage("You are a weather analysis assistant..."),
            new UserMessage("What's the weather like in Tokyo?")
        ),
        BedrockChatOptions.builder()
            .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
            .cacheOptions(BedrockCacheOptions.builder()
                .strategy(BedrockCacheStrategy.SYSTEM_AND_TOOLS)
                .build())
            .toolCallbacks(weatherToolCallbacks)
            .maxTokens(500)
            .build()
    )
);

// Cache conversation history with ChatClient and memory
ChatClient chatClient = ChatClient.builder(chatModel)
    .defaultSystem("You are a personalized career counselor...")
    .defaultAdvisors(MessageChatMemoryAdvisor.builder(chatMemory)
        .conversationId(conversationId)
        .build())
    .build();

String response = chatClient.prompt()
    .user("What career advice would you give me?")
    .options(BedrockChatOptions.builder()
        .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
        .cacheOptions(BedrockCacheOptions.builder()
            .strategy(BedrockCacheStrategy.CONVERSATION_HISTORY)
            .build())
        .maxTokens(500)
        .build())
    .call()
    .content();

String response = ChatClient.create(chatModel)
    .prompt()
    .system("You are an expert document analyst...")
    .user("Analyze this large document: " + document)
    .options(BedrockChatOptions.builder()
        .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
        .cacheOptions(BedrockCacheOptions.builder()
            .strategy(BedrockCacheStrategy.SYSTEM_ONLY)
            .build())
        .build())
    .call()
    .content();

import software.amazon.awssdk.services.bedrockruntime.model.TokenUsage;

ChatResponse response = chatModel.call(/* ... */);

// Access cache metrics from native TokenUsage object
TokenUsage tokenUsage = (TokenUsage) response.getMetadata()
    .getUsage()
    .getNativeUsage();

if (tokenUsage != null) {
    Integer cacheWrite = tokenUsage.cacheWriteInputTokens();
    Integer cacheRead = tokenUsage.cacheReadInputTokens();
    System.out.println("Cache write: " + cacheWrite + ", Cache read: " + cacheRead);
}

ChatResponse response = chatModel.call(/* ... */);

// Access cache metrics from metadata Map
Integer cacheWrite = (Integer) response.getMetadata()
    .getMetadata()
    .get("cacheWriteInputTokens");
Integer cacheRead = (Integer) response.getMetadata()
    .getMetadata()
    .get("cacheReadInputTokens");

// Load a legal contract (PDF or text)
String legalContract = loadDocument("merger-agreement.pdf"); // ~3000 tokens

// System prompt with legal expertise
String legalSystemPrompt = "You are an expert legal analyst specializing in corporate law. " +
    "Analyze the following contract and provide precise answers about terms, obligations, and risks: " +
    legalContract;

// First analysis - creates cache
ChatResponse riskAnalysis = chatModel.call(
    new Prompt(
        List.of(
            new SystemMessage(legalSystemPrompt),
            new UserMessage("What are the key termination clauses and associated penalties?")
        ),
        BedrockChatOptions.builder()
            .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
            .cacheOptions(BedrockCacheOptions.builder()
                .strategy(BedrockCacheStrategy.SYSTEM_ONLY)
                .build())
            .maxTokens(1000)
            .build()
    )
);

// Subsequent questions reuse cached document - 90% cost savings
ChatResponse obligationAnalysis = chatModel.call(
    new Prompt(
        List.of(
            new SystemMessage(legalSystemPrompt), // Same content - cache hit
            new UserMessage("List all financial obligations and payment schedules.")
        ),
        BedrockChatOptions.builder()
            .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
            .cacheOptions(BedrockCacheOptions.builder()
                .strategy(BedrockCacheStrategy.SYSTEM_ONLY)
                .build())
            .maxTokens(1000)
            .build()
    )
);

// Define comprehensive code review guidelines
String reviewGuidelines = """
    You are a senior software engineer conducting code reviews. Apply these criteria:
    - Security vulnerabilities and best practices
    - Performance optimizations and memory usage
    - Code maintainability and readability
    - Testing coverage and edge cases
    - Design patterns and architecture compliance
    """;

List<String> codeFiles = Arrays.asList(
    "UserService.java", "PaymentController.java", "SecurityConfig.java"
);

List<String> reviews = new ArrayList<>();

for (String filename : codeFiles) {
    String sourceCode = loadSourceFile(filename);

    ChatResponse review = chatModel.call(
        new Prompt(
            List.of(
                new SystemMessage(reviewGuidelines), // Cached across all reviews
                new UserMessage("Review this " + filename + " code:\n\n" + sourceCode)
            ),
            BedrockChatOptions.builder()
                .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
                .cacheOptions(BedrockCacheOptions.builder()
                    .strategy(BedrockCacheStrategy.SYSTEM_ONLY)
                    .build())
                .maxTokens(800)
                .build()
        )
    );

    reviews.add(review.getResult().getOutput().getText());
}

// Guidelines cached after first request, subsequent reviews are faster and cheaper

// Load comprehensive product knowledge
String knowledgeBase = """
    PRODUCT DOCUMENTATION:
    - API endpoints and authentication methods
    - Common troubleshooting procedures
    - Billing and subscription details
    - Integration guides and examples
    - Known issues and workarounds
    """ + loadProductDocs(); // ~2500 tokens

@Service
public class CustomerSupportService {

    public String handleCustomerQuery(String customerQuery, String customerId) {
        ChatResponse response = chatModel.call(
            new Prompt(
                List.of(
                    new SystemMessage("You are a helpful customer support agent. " +
                        "Use this knowledge base to provide accurate solutions: " + knowledgeBase),
                    new UserMessage("Customer " + customerId + " asks: " + customerQuery)
                ),
                BedrockChatOptions.builder()
                    .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
                    .cacheOptions(BedrockCacheOptions.builder()
                        .strategy(BedrockCacheStrategy.SYSTEM_ONLY)
                        .build())
                    .maxTokens(600)
                    .build()
            )
        );

        return response.getResult().getOutput().getText();
    }
}

// Knowledge base is cached across all customer queries
// Multiple support agents can benefit from the same cached content

// Shared tool definitions (cached once, used across all tenants)
List<FunctionToolCallback> sharedTools = createLargeToolRegistry(); // ~2000 tokens

// Tenant-specific configuration
@Service
public class MultiTenantAIService {

    public String processRequest(String tenantId, String userQuery) {
        // Load tenant-specific system prompt (changes per tenant)
        String tenantPrompt = loadTenantSystemPrompt(tenantId);

        ChatResponse response = chatModel.call(
            new Prompt(
                List.of(
                    new SystemMessage(tenantPrompt), // Tenant-specific, not cached
                    new UserMessage(userQuery)
                ),
                BedrockChatOptions.builder()
                    .model("us.anthropic.claude-haiku-4-5-20251001-v1:0")
                    .cacheOptions(BedrockCacheOptions.builder()
                        .strategy(BedrockCacheStrategy.TOOLS_ONLY)
                        .build())
                    .toolCallbacks(sharedTools) // Shared tools - cached
                    .maxTokens(500)
                    .build()
            )
        );

        return response.getResult().getOutput().getText();
    }
}

// Tools cached once, each tenant gets customized system prompt