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Async Processing

Use CompletableFuture and async frameworks for non-blocking operations.

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Async Processing

CompletableFuture

CompletableFuture.supplyAsync(() -> fetchProduct(id))
    .thenApply(product -> enrichProduct(product))
    .thenAccept(product -> sendResponse(product))
    .exceptionally(ex -> handleError(ex));

Spring @Async

@Service
public class NotificationService {
    @Async
    public void sendEmail(EmailRequest request) {
        // Runs in separate thread
    }
}

Key Points

Understanding Async Processing is essential for production systems
Always consider scalability and maintainability
Test thoroughly before deploying to production
Monitor performance and set up alerting

Common Patterns

Validation: Always validate input at the boundary
Error Handling: Use structured error responses
Logging: Log key events for debugging
Testing: Unit, integration, and load tests
Documentation: Keep docs updated with code changes

Best Practices

Key Principles

Follow SOLID principles
Write clean, readable code
Test thoroughly
Document decisions
Monitor in production

Implementation

Start simple, refactor as needed
Use established patterns
Consider trade-offs
Review with peers

Continuous Improvement

Learn from incidents
Update documentation
Share knowledge
Mentor others

Key Points

Understanding Async Processing is essential for production systems
Always consider scalability and maintainability
Test thoroughly before deploying to production
Monitor performance and set up alerting

Common Patterns

Validation: Always validate input at the boundary
Error Handling: Use structured error responses
Logging: Log key events for debugging
Testing: Unit, integration, and load tests
Documentation: Keep docs updated with code changes

Practice Problems

0/3solved

intermediateImplement Async Processing

Design and implement a solution for Async Processing in a backend system. Consider scalability, error handling, and production readiness.

Solution

// Async Processing implementation
// Key aspects: validation, error handling, logging, testing

public class AsyncProcessing {
    // Production-ready implementation
}

intermediateAsync Processing Edge Cases

Identify and handle edge cases for Async Processing. What happens under high load, with invalid input, or during failures?

Solution

// Edge case handling:
// 1. Null/empty input -> validation
// 2. High load -> rate limiting, queuing
// 3. Failures -> retries, circuit breaker
// 4. Concurrent access -> locks, idempotency

beginnerAsync Processing Testing Strategy

Write a testing strategy for Async Processing. Include unit tests, integration tests, and performance tests.

Solution

// Test plan:
// - Unit: 80% coverage target
// - Integration: API contracts
// - Performance: latency, throughput
// - Chaos: failure injection

Flashcards

Question

CompletableFuture chaining?

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Answer

thenApply, thenAccept, exceptionally

Question

@Async?

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Answer

Runs in separate thread pool

Question

What is Async Processing?

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Answer

Async Processing is a key concept in backend development.

Question

When to use Async Processing?

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Answer

Use Async Processing when building production systems that require reliability, scalability, and maintainability.

Question

Async Processing best practices

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Answer

Follow SOLID principles, write clean code, test thoroughly, document decisions, and monitor in production.

Async Processing

Async Processing

CompletableFuture

Spring @Async

Key Points

Common Patterns

Best Practices

Key Principles

Implementation

Continuous Improvement

Key Points

Common Patterns

Practice Problems

Quiz

Flashcards

Revision Notes

Key Takeaways

Interview Tips

Cheat Sheet

Async Processing