Identify where an event must be raised

Let's take as an example a simple class which has a simple method:

Figure 1. A simple class which performs an action

package curam.mypackage;

public class MyEventSource {

  public void doSomething() {

    // do whatever it is that needs to be done
    System.out.println("Do something!");

  }

}

You decide that events should be raised:

before doSomething performs its logic (preDoSomething); and
after doSomething performs its logic (postDoSomething).