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package javax.servlet.http;
import java.util.EventListener;
/**
* Causes an object to be notified when it is bound to
* or unbound from a session. The object is notified
* by an {@link HttpSessionBindingEvent} object. This may be as a result
* of a servlet programmer explicitly unbinding an attribute from a session,
* due to a session being invalidated, or due to a session timing out.
*
*
* @author Various
*
* @see HttpSession
* @see HttpSessionBindingEvent
*
*/
public interface HttpSessionBindingListener extends EventListener {
/**
*
* Notifies the object that it is being bound to
* a session and identifies the session.
*
* @param event the event that identifies the
* session
*
* @see #valueUnbound
*
*/
public void valueBound(HttpSessionBindingEvent event);
/**
*
* Notifies the object that it is being unbound
* from a session and identifies the session.
*
* @param event the event that identifies
* the session
*
* @see #valueBound
*
*/
public void valueUnbound(HttpSessionBindingEvent event);
}