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/* Copyright 2004, 2005, 2006 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.acl.basic;

/**
 * Provides a cache of {@link BasicAclEntry} objects.
 * 
 * 
 * Implementations should provide appropriate methods to set their cache
 * parameters (eg time-to-live) and/or force removal of entities before their
 * normal expiration. These are not part of the
 * BasicAclEntryCache interface contract because they vary
 * depending on the type of caching system used (eg in-memory vs disk vs
 * cluster vs hybrid).
 * 
 *
 * @author Ben Alex
 * @version $Id: BasicAclEntryCache.java,v 1.3 2006/01/27 04:42:39 benalex Exp $
 */
public interface BasicAclEntryCache {
    //~ Methods ================================================================

    /**
     * Obtains an array of {@link BasicAclEntry}s from the cache.
     *
     * @param aclObjectIdentity which should be obtained from the cache
     *
     * @return any applicable BasicAclEntrys (no
     *         nulls are permitted in the returned array) or
     *         null if the object identity could not be found or
     *         if the cache entry has expired
     */
    public BasicAclEntry[] getEntriesFromCache(
        AclObjectIdentity aclObjectIdentity);

    /**
     * Places an array of {@link BasicAclEntry}s in the cache.
     * 
     * 
     * No nulls are allowed in the passed array. If any
     * null is passed, the implementation may throw an exception.
     * 
     *
     * @param basicAclEntry the ACL entries to cache (the key will be extracted
     *        from the {@link BasicAclEntry#getAclObjectIdentity()} method
     */
    public void putEntriesInCache(BasicAclEntry[] basicAclEntry);

    /**
     * Removes all ACL entries related to an {@link AclObjectIdentity} from the
     * cache.
     *
     * @param aclObjectIdentity which should be removed from the cache
     */
    public void removeEntriesFromCache(AclObjectIdentity aclObjectIdentity);
}