Spring Boot API response time

Question

I am developing the Spring Boot API's.

Now comes the monitoring part. I want to add monitoring to it. So I used actuator, fetch data(like gc, memory etc) from it & plot it on Grafana.

Now comes the response time of API's. Actuator guage just return the last API Hit. So basically how do I calculate the response time of every API for evry hit. I mean where I should place

long startTime = System.currentTimeMillis();

and

long endTime = System.currentTimeMillis(); long diff = endTime - startTime;

I have tried placing it on controller, 1st line of controller & last line of controller but the result is different when I am comparing it with Guage.

How should I correctly measure it?

what you are looking for is a histogram, Spring boot acuator doesn't have support for histogram, But Spring Boot Actuator can work with Dropwizard's metrics library(metrics.dropwizard.io/3.2.2), which has histogram support, check it out. — pvpkiran
– pvpkiran, Commented May 16, 2017 at 9:58
What I am more curious abt that is there any way I can get that data manuyally? Response time with every API Hit? — Ankit Bansal
– Ankit Bansal, Commented May 16, 2017 at 10:02

Strelok · Accepted Answer · 2017-05-16 10:12:04Z

You can try and have an AOP "around" advice around the DispatcherServlet#service method maybe?

Untested:

@Aspect @Component public class AroundExample { @Around("org.springframework.web.servlet.DispatcherServlet.service()") public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable { // start stopwatch Object retVal = pjp.proceed(); // stop stopwatch return retVal; } }

Don't forget to add the aop starter in your POM:

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

That would give you a pretty close timing of the whole request invocation, including all the stuff like Spring interceptors, handlers, controllers, etc.

public class XYZ { @Around("execution(* org.springframework.web.servlet.DispatcherServlet.service(..))") public Object doBasicProfiling(ProceedingJoinPoint pjp) throws Throwable { // start stopwatch System.out.println("Before"); Object retVal = pjp.proceed(); // stop stopwatch System.out.println("Me here"); return retVal; } } This code is executing but not printing anything? What Am i Missing?
What do you mean by "executing, but not printing anything"? Did you set a breakpoint in the debugger?
I mean no compile errors are there but still even i after i place prints, nothing is printed. I mean code is compiling but not printing anything

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