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package javax.servlet;

import java.util.EventListener;

/**
 * Interface for receiving notification events about ServletContext
 * attribute changes.
 *
 * 

In order to receive these notification events, the implementation * class must be either declared in the deployment descriptor of the web * application, annotated with {@link javax.servlet.annotation.WebListener}, * or registered via one of the addListener methods defined on * {@link ServletContext}. * *

The order in which implementations of this interface are invoked is * unspecified. * * @see ServletContextAttributeEvent * * @since Servlet 2.3 */ public interface ServletContextAttributeListener extends EventListener { /** * Receives notification that an attribute has been added to the * ServletContext. * * @param event the ServletContextAttributeEvent containing the * ServletContext to which the attribute was added, along with the * attribute name and value */ public void attributeAdded(ServletContextAttributeEvent event); /** * Receives notification that an attribute has been removed * from the ServletContext. * * @param event the ServletContextAttributeEvent containing the * ServletContext from which the attribute was removed, along with * the attribute name and value */ public void attributeRemoved(ServletContextAttributeEvent event); /* * Receives notification that an attribute has been replaced * in the ServletContext. * * @param event the ServletContextAttributeEvent containing the * ServletContext in which the attribute was replaced, along with * the attribute name and its old value */ public void attributeReplaced(ServletContextAttributeEvent event); }





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