/*
 * Copyright 2005-2008 Les Hazlewood
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jsecurity.authc;

import org.jsecurity.subject.PrincipalCollection;

/**
 * An SPI interface allowing cleanup logic to be executed during logout of a previously authenticated Subject/user.
 *
 * <p>As it is an SPI interface, it is really intended for SPI implementors such as those implementing Realms.
 *
 * <p>All of JSecurity's concrete Realm implementations implement this interface as a convenience for those wishing
 * to subclass them.
 *
 * @author Les Hazlewood
 * @since 0.9
 */
public interface LogoutAware {

    /**
     * Callback allowing logout logic if so desired for a previously
     * authenticated Subject/user.
     *
     * @param principals the application-specific Subject/user identifiers that is logging out.
     */
    public void onLogout( PrincipalCollection principals );
}