CODEWITHSUNDEEP
java
Greesh Kumar
Greesh Kumar

Reputation: 1888

Annotating a method to turn on performance tracing

I have a Test class with a method called public void httpcall(), I need to get the execution time of this method. In order to do this, I have used System.nanoTime() before and after calling it. I get the execution time from that duration.

code snippet:

public class Test{

    public void httpcall(){
        try {

            HttpResponse rs = HttpClientUtil.get("http://192.169.1.2:9090/plugins/restapi/v1/users/9223370580466120397/roster",RestOpenfire.ACCEPT, "8V9BUNA0f1gNQI3S");


        } catch (Exception e) {

            System.out.println("Error : "+e);

        }
    }

    public static void main(String[] args) {

        Test test=new Test();
        long startTime = System.nanoTime();

            test.httpcall();

        long endTime = System.nanoTime();

        long duration = (endTime-startTime);

        System.out.println("Execution Time : "+duration);

    }

}

I want to make an annotation like @Time that gives an execution time of the method, something like ..

@Time
public void httpcall(){
    try {
        HttpResponse rs = HttpClientUtil.get("http://192.169.1.2:9090/plugins/restapi/v1/users/9223370580466120397/roster", 
                RestOpenfire.ACCEPT, "8V9BUNA0f1gNQI3S");
    } catch (Exception e) {
        System.out.println("Error : " + e);
    }
}

How could I do this?

Upvotes: 1

Views: 551

Answers (1)

user967710
user967710

Reputation: 2007

You can try to use aspectj which can either change your source code as part of your build, change your .class files in a process called weaving or change it on runtime.

https://mathewjhall.wordpress.com/2011/03/31/tracing-java-method-execution-with-aspectj/

Thought, it can be an overkill. Unless you have a huge system that will be hard to refactor, I recommend using template methods. That is,

abstract class Measurable
{
   protected void abstract doWork();

   public void execute(){
     stopWatch = StopWatch.start();
     doWork();
     stopWatch.stop();
     System.out.println(stopWatch.getTime());
   }
}

class MyHttpClient extends Measurable
{
    doWork(){
        HttpResponse rs = HttpClientUtil.get("http://192.169.1.2:9090/plugins/restapi/v1/users/9223370580466120397/roster",RestOpenfire.ACCEPT, "8V9BUNA0f1gNQI3S");
    }
}

public static void main(String[] args) {

    MyHttpClient test=new MyHttpClient();
    test.execute();
}

And all uses of MyHttpClient will call the execute() method.

Also note that I used StopWatch class, since it is more elegant and standard than using System.currentTimeMillis. https://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/time/StopWatch.html

Upvotes: 2

Related Questions