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Jakarta Faces defines an MVC framework for building user interfaces for web applications, including UI components, state management, event handing, input validation, page navigation, and support for internationalization and accessibility.

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/*
 * Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package jakarta.faces.component;

import jakarta.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}.
     */
    void invokeContextCallback(FacesContext context, UIComponent target);

}