javax.servlet.ServletContextAttributeListener Maven / Gradle / Ivy
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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);
}