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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
There is a newer version: 2.4.0
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package javax.faces.component;

import javax.faces.context.FacesContext;

/**
 *
 * A simple callback interace that enables taking action on a
 * specific UIComponent (either facet or child) in the view while
 * preserving any contextual state for that component instance in the
 * view.
 *
 */
public interface ContextCallback {
    
    /**
     * This method will be called by an implementation of {@link
     * UIComponent#invokeOnComponent} and must be passed the component
     * with the clientId given as an argument to
     * invokeOnComponent.  At the point in time when this
     * method is called, the argument target is guaranteed
     * to be in the proper state with respect to its ancestors in the
     * View.
     *
     * @param context the FacesContext for this request.
     *
     * @param target the {@link UIComponent} that was located by
     * clientId by a call to {@link
     * UIComponent#invokeOnComponent}.
     */
    
    public void invokeContextCallback(FacesContext context, 
				      UIComponent target);
    
}