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package javax.servlet;

import java.util.EventListener;

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

Notifications will be generated while the request * is within the scope of the web application. A ServletRequest * is defined as coming into scope of a web application when it * is about to enter the first servlet or filter of the web * application, and as going out of scope when it exits the last * servlet or the first filter in the chain. * *

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. * * @since Servlet 2.4 */ public interface ServletRequestAttributeListener extends EventListener { /** * Receives notification that an attribute has been added to the * ServletRequest. * * @param srae the ServletRequestAttributeEvent containing the * ServletRequest and the name and value of the attribute that was * added */ public void attributeAdded(ServletRequestAttributeEvent srae); /** * Receives notification that an attribute has been removed from the * ServletRequest. * * @param srae the ServletRequestAttributeEvent containing the * ServletRequest and the name and value of the attribute that was * removed */ public void attributeRemoved(ServletRequestAttributeEvent srae); /** * Receives notification that an attribute has been replaced on the * ServletRequest. * * @param srae the ServletRequestAttributeEvent containing the * ServletRequest and the name and (old) value of the attribute * that was replaced */ public void attributeReplaced(ServletRequestAttributeEvent srae); }





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