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Spring Boot AOP

Spring Boot AOP (Aspect-Oriented Programming) provides support for implementing cross-cutting concerns like logging, transaction management, security, and performance monitoring. It allows you to separate these concerns from business logic, resulting in cleaner and more maintainable code.

Key Features

Use Cases

• Logging: Adding logging to methods without modifying business code
• Transaction Management: Declarative transaction management with @Transactional
• Security: Method-level security checks and authorization
• Performance Monitoring: Measuring method execution time and performance metrics
• Error Handling: Centralized exception handling and error logging

Example Usage

Create a logging aspect:

@Aspect
@Component
public class LoggingAspect {
    
    private static final Logger logger = LoggerFactory.getLogger(LoggingAspect.class);
    
    @Before("execution(* com.example.service.*.*(..))")
    public void logBefore(JoinPoint joinPoint) {
        logger.info("Executing method: {}", joinPoint.getSignature().getName());
    }
    
    @Around("@annotation(com.example.annotation.Monitor)")
    public Object monitorExecution(ProceedingJoinPoint joinPoint) throws Throwable {
        long start = System.currentTimeMillis();
        try {
            Object result = joinPoint.proceed();
            long duration = System.currentTimeMillis() - start;
            logger.info("Method {} executed in {} ms", 
                joinPoint.getSignature().getName(), duration);
            return result;
        } catch (Exception e) {
            logger.error("Error in method {}", joinPoint.getSignature().getName(), e);
            throw e;
        }
    }
}

Dependencies

Add the following dependency:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
</dependency>

Configuration

Enable AOP in your configuration:

@Configuration
@EnableAspectJAutoProxy
public class AopConfig {
    // AOP configuration
}

Common Patterns

Common AOP patterns include:

• Transaction management with @Transactional
• Method-level security with @PreAuthorize
• Performance monitoring and metrics collection
• Audit logging for important operations
• Retry logic for failed operations