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package javax.security.auth.message.config;

import javax.security.auth.message.*;

/**
 * An implementation of this interface may be associated with an 
 * AuthConfigProvider registration at an AuthConfigFactory at the 
 * time the AuthConfigProvider is obtained for use from the factory. 
 * The AuthConfigFactory will invoke the notify
 * method of the RegistrationListener if the corresponding provider 
 * registration is unregistered or replaced at the factory. 
 */

public interface RegistrationListener {

    /**
     * Notify the listener that a registration with which it was
     * associated was replaced or unregistered.
     *
     * <p> When a RegistrationListener is associated with a provider
     * registration within the factory, the factory must call its
     * <code>notify</code> method when the corresponding registration 
     * is unregistered or replaced.
     
     * @param layer A String identifying the one or more message layers 
     * corresponding to the registration for which the listerner is being 
     * notified.
     *
     * @param appContext A String value identifying the application 
     * contexts corresponding to the registration for which the listener is 
     * being notified.
     *
     * The factory detaches the listener from the corresponding 
     * registration once the listener has been notified for the 
     * registration.
     * 
     * The <code>detachListerner</code> method
     * must be called to detach listeners that are no longer in use.
     */
    public void notify(String layer, String appContext);
    
}