[Java Spring] Aspect

Create you own decreator!

Add dependency:

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.5</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.30</version>
        </dependency>

aspect/Loggable.java:

package com.frankmoley.lil.fid.aspect;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface Loggable {
}

aspect/LoggingAspect.java:

package com.frankmoley.lil.fid.aspect;

import java.util.Arrays;
import java.util.Collection;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class LoggingAspect {

    private static final Logger LOGGER = LoggerFactory.getLogger(LoggingAspect.class);

    @Pointcut("@annotation(Loggable)")
    public void executeLogging(){}

    @AfterReturning(value = "executeLogging()", returning = "returnValue")
    public void logMethodCall(JoinPoint joinPoint, Object returnValue){
        StringBuilder message = new StringBuilder("Method: ");
        message.append(joinPoint.getSignature().getName());
        Object[] args = joinPoint.getArgs();
        if (null!=args && args.length>0){
            message.append(" args=[ | ");
            Arrays.asList(args).forEach(arg->{
                message.append(arg).append(" | ");
            });
            message.append("]");
        }
        if(returnValue instanceof Collection){
            message.append(", returning: ").append(((Collection)returnValue).size()).append(" instance(s)");
        }else{
            message.append(", returning: ").append(returnValue.toString());
        }

        LOGGER.info(message.toString());
    }


}

Using;

@Service
public class GreetingService {

    @Value("${app.greeting}")
    private String greeting;

    public GreetingService(){
        super();
    }

    @Loggable
    public String getGreeting(String name){
        return greeting + " " + name;
    }
}

Around:

    @Around(value = "executeLogging()")
    public Object logMethodCall(ProceedingJoinPoint joinPoint) throws Throwable {
        long startTime = System.currentTimeMillis();
        Object returnValue = joinPoint.proceed();
        long totalTime = System.currentTimeMillis()-startTime;
        StringBuilder message = new StringBuilder("Method: ");
        message.append(joinPoint.getSignature().getName());
        message.append(" totalTime: ").append(totalTime).append("ms");
        Object[] args = joinPoint.getArgs();
        if (null!=args && args.length>0){
            message.append(" args=[ | ");
            Arrays.asList(args).forEach(arg->{
                message.append(arg).append(" | ");
            });
            message.append("]");
        }
        if(returnValue instanceof Collection){
            message.append(", returning: ").append(((Collection)returnValue).size()).append(" instance(s)");
        }else{
            message.append(", returning: ").append(returnValue.toString());
        }

        LOGGER.info(message.toString());
        return returnValue;
    }