How to use Interface IConfigureCallBack class of org.testng package

1package listeners;
2
3import org.testng.IConfigurable;
4import org.testng.IConfigureCallBack;
5import org.testng.ITestResult;
6import org.testng.internal.IConfiguration;
7
8//IConfigurable interface can be implemented to configure all “Configurable annotations” eg. @BeforeSuite, @BeforeTest etc.
9public class ConfigurableListener implements IConfigurable {
10    @Override
11    public void run(IConfigureCallBack callBack, ITestResult testResult) {
12        System.out.println("Execute this before any configuration steps gets executed");
13        callBack.runConfigurationMethod(testResult);
14    }
15}
16

Source: ConfigurableListener.java

package listeners;

import org.testng.IConfigurable;
import org.testng.IConfigureCallBack;
import org.testng.ITestResult;
import org.testng.internal.IConfiguration;

//IConfigurable interface can be implemented to configure all “Configurable annotations” eg. @BeforeSuite, @BeforeTest etc.
public class ConfigurableListener implements IConfigurable {
    @Override
    public void run(IConfigureCallBack callBack, ITestResult testResult) {
        System.out.println("Execute this before any configuration steps gets executed");
        callBack.runConfigurationMethod(testResult);
    }
}

1package org.testng;
2
3/**
4 * If a test class implements this interface, its run() method
5 * will be invoked instead of each configuration method found.  The invocation of
6 * the configuration method will then be performed upon invocation of the callBack()
7 * method of the IConfigureCallBack parameter.
8 *
9 * @author cbeust
10 * Sep 07, 2010
11 */
12public interface IConfigurable extends ITestNGListener {
13  public void run(IConfigureCallBack callBack, ITestResult testResult);
14}
15

Source: IConfigurable.java

package org.testng;

/**
 * If a test class implements this interface, its run() method
 * will be invoked instead of each configuration method found.  The invocation of
 * the configuration method will then be performed upon invocation of the callBack()
 * method of the IConfigureCallBack parameter.
 *
 * @author cbeust
 * Sep 07, 2010
 */
public interface IConfigurable extends ITestNGListener {
  public void run(IConfigureCallBack callBack, ITestResult testResult);
}