Spring's method injection

I'm reading the Spring current version's documentation and have problems with understanding of the chapter 5.4.6 Method Injection. As far as I got that we can provide the ability of recreation a bean every time we call the method using the bean. Documentation provides the following code example:

public class CommandManager implements ApplicationContextAware {

    //Imports and comments were omitted
    private ApplicationContext applicationContext;

    public Object process(Map commandState) {
        Command command = createCommand();
        command.setState(commandState);
        return command.execute();
    }

    protected Command createCommand() {
        return this.applicationContext.getBean("command", Command.class);
    }

    public void setApplicationContext(
            ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }
}

where ApplicationContextAware interface looks like:

public interface ApplicationContextAware {

    //JavaDocs ommited
    void setApplicationContext(ApplicationContext applicationContext) throws BeansException;

}

So, what is the method public Object process(Map commandState)? Is it a callback? If so, where is it going to be called and who performs that call? After all, it's not clear why the bean is goign to be recreated every time it needed.