/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (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.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is nsICacheService.idl, released February 10, 2001.
 * 
 * The Initial Developer of the Original Code is Netscape Communications
 * Corporation.  Portions created by Netscape are
 * Copyright (C) 2001 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s): 
 *    Gordon Sheridan <gordon@netscape.com>
 *    Patrick Beard   <beard@netscape.com>
 *    Darin Fisher    <darin@netscape.com>
 */

#include "nsISupports.idl"
#include "nsICache.idl"

interface nsISimpleEnumerator;
interface nsICacheListener;
interface nsICacheSession;
interface nsICacheVisitor;

[scriptable, uuid(0ebec4c7-742f-4f27-8e7b-7c8a0cc76348)]
interface nsICacheService : nsISupports
{
    /**
     * Initialize the cache service.
     */
    void init();

    /**
     * Shutdown the cache service.
     */
    void shutdown();

    /**
     * Create a cache session
     *
     * A cache session represents a client's access into the cache.  The cache
     * session is not "owned" by the cache service.  Hence, it is possible to
     * create duplicate cache sessions.  Entries created by a cache session
     * are invisible to other cache sessions, unless the cache sessions are
     * equivalent.
     *
     * @param clientID - Specifies the name of the client using the cache.
     * @param storagePolicy - Limits the storage policy for all entries
     *   accessed via the returned session.  As a result, devices excluded
     *   by the storage policy will not be searched when opening entries
     *   from the returned session.
     * @param streamBased - Indicates whether or not the data being cached
     *   can be represented as a stream.  The storagePolicy must be 
     *   consistent with the value of this field.  For example, a non-stream-
     *   based cache entry can only have a storage policy of STORE_IN_MEMORY.
     * @return new cache session.
     */
    nsICacheSession createSession(in string                 clientID,
                                  in nsCacheStoragePolicy   storagePolicy,
                                  in boolean                streamBased);

    /**
     * Visit entries stored in the cache.  Used to implement about:cache.
     */
    void visitEntries(in nsICacheVisitor visitor);

    /**
     * Evicts all entries in all devices implied by the storage policy.
     */
    void evictEntries(in nsCacheStoragePolicy  storagePolicy);
};