intermediatePhase ·

Health Checks

Implement health check endpoints for load balancers and orchestrators.

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Health Checks

Spring Boot Actuator

management.endpoints.web.exposure.include=health,info,metrics
management.endpoint.health.show-details=when-authorized

Custom Health Indicator

@Component
public class DatabaseHealthIndicator implements HealthIndicator {
    @Autowired
    private DataSource dataSource;

    @Override
    public Health health() {
        try (Connection conn = dataSource.getConnection()) {
            return Health.up().withDetail("database", "accessible").build();
        } catch (SQLException e) {
            return Health.down().withDetail("database", e.getMessage()).build();
        }
    }
}

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 Health Checks 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 Health Checks

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

Solution

// Health Checks implementation
// Key aspects: validation, error handling, logging, testing

public class HealthChecks {
    // Production-ready implementation
}

intermediateHealth Checks Edge Cases

Identify and handle edge cases for Health Checks. 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

beginnerHealth Checks Testing Strategy

Write a testing strategy for Health Checks. 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

Health check endpoint?

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Answer

/actuator/health

Question

HealthIndicator returns?

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Answer

Health object (UP/DOWN)

Question

What is Health Checks?

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Answer

Health Checks is a key concept in backend development.

Question

When to use Health Checks?

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Answer

Use Health Checks when building production systems that require reliability, scalability, and maintainability.

Question

Health Checks best practices

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Answer

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

Health Checks

Health Checks

Spring Boot Actuator

Custom Health Indicator

Best Practices

Key Principles

Implementation

Continuous Improvement

Key Points

Common Patterns

Practice Problems

Quiz

Flashcards

Revision Notes

Key Takeaways

Interview Tips

Cheat Sheet

Health Checks