Here is an example of a class extending ContextAwareBase in Logback:

import ch.qos.logback.core.Context;
import ch.qos.logback.core.ContextAwareBase;

public class MyContextAwareBase extends ContextAwareBase {

    private Context context;

    public MyContextAwareBase(Context context) {
        this.context = context;
        setContext(context);
    }

    @Override
    public void start() {
        // additional initialization code
        super.start();
    }

    public void doSomething() {
        // logic for doing something
    }
}

This class is an example of a custom context-aware class in Logback. It extends ContextAwareBase, which is a base class for creating classes that are aware of a Context object. The Context object is passed in the constructor and is set using the setContext method.

The start method is overridden to perform additional initialization. Additionally, a custom method doSomething is added to the class to demonstrate how a context-aware class can use the context object to perform its operations.

It is important to note that this class is extending ContextAwareBase which provides a base class for creating classes that are aware of a Context object. The Context object is used to configure and obtain resources such as appenders, converters, etc. The ContextAwareBase class provides a mechanism for subclasses to access the Context object and to be notified when the Context object is reset.