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/* Copyright 2004, 2005 Acegi Technology Pty Limited
 *
 * 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.acegisecurity.concurrent;

import org.acegisecurity.Authentication;
import org.acegisecurity.AuthenticationException;


/**
 * Provides two methods that can be called by an {@link
 * org.acegisecurity.AuthenticationManager} to integrate with the
 * concurrent session handling infrastructure.
 *
 * @author Ben Alex
 * @version $Id: ConcurrentSessionController.java,v 1.2 2005/11/17 00:55:56 benalex Exp $
 */
public interface ConcurrentSessionController {
    //~ Methods ================================================================

    /**
     * Called by any class that wishes to know whether the current
     * authentication request should be permitted. Generally callers will be
     * AuthenticationManagers before they authenticate, but could
     * equally include Filters or other interceptors that wish to
     * confirm the ongoing validity of a previously authenticated
     * Authentication.
     * 
     * 
     * The implementation should throw a suitable exception if the user has
     * exceeded their maximum allowed concurrent sessions.
     * 
     *
     * @param request the authentication request (never null)
     *
     * @throws AuthenticationException if the user has exceeded their maximum
     *         allowed current sessions
     */
    public void checkAuthenticationAllowed(Authentication request)
        throws AuthenticationException;

    /**
     * Called by an AuthenticationManager when the authentication
     * was successful. An implementation is expected to register the
     * authenticated user in some sort of registry, for future concurrent
     * tracking via the {@link #checkConcurrentAuthentication(Authentication)}
     * method.
     *
     * @param authentication the successfully authenticated user (never
     *        null)
     */
    public void registerSuccessfulAuthentication(Authentication authentication);
}