Testng annotation transformer to apply @test annotation at runtime . Here we are setting the timeout using it.

TestNGAnnotationTransformer

package com.testng.practise;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

import org.testng.IAnnotationTransformer;
import org.testng.ITest;
import org.testng.annotations.ITestAnnotation;
import org.testng.annotations.Test;
import org.testng.IAnnotationTransformer;

public class TestNGAnnotationTransformer implements IAnnotationTransformer{
	@Override
	public void transform(ITestAnnotation annotation, Class testClass,
		Constructor testConstructor, Method testMethod) {
		annotation.setTimeOut(2000);
		annotation.getInvocationCount();
	}
}