gecko/netwerk/cache/public/nsIOfflineCacheSession.idl

/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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 nsIOfflineCacheSession.idl.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2007
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Dave Camp <dcamp@mozilla.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

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

[scriptable, uuid(e9581d9f-3c0c-4722-8d2b-3d18f8d41299)]
interface nsIOfflineCacheSession : nsISupports
{
    /**
     * The offline cache is meant to reliably store resources for
     * offline use.  The expected semantics are:
     *
     * a) Once populated, the cache will not evict an application resource
     *    unless explicitly asked.
     *
     * b) Resources no longer in use by the application should be evicted.
     *
     * c) If the cache fills up, new entries should be rejected rather
     *    than throwing out old ones.
     *
     * The offline cache uses domains to concretely represent an
     * application.  It maintains a list of resources to be pinned for
     * each domain.  This list is separate from actual cache
     * population - the caller is still responsible for placing items
     * in the cache, and ownership can be declared without a
     * corresponding entry.
     *
     * A key can optionally be associated with a specific URI within
     * the domain.
     */

    /**
     * Sets the resources owned by a given domain/URI pair.
     *
     * Setting a list will remove any resources previously owned by this
     * domain/URI pair.
     *
     * A key can be added while there is no associated entry.  When
     * an entry is created with this key, it will be owned by the
     * domain/URI pair.
     *
     * @param ownerDomain The domain that owns the resources.
     * @param ownerURI The specific URI that owns the resources.  This can
     *        be empty if no URI specifically owns the resources.
     * @param count The number of keys in keys.
     * @param keys The keys that the domain/URI pair own.  This can be empty
     *        to clear ownership for the domain/URI pair.
     */
    void setOwnedKeys(in ACString ownerDomain,
                      in ACString ownerURI,
                      in unsigned long count,
                      [array, size_is(count)]in string keys);

    /**
     * Gets the list of resources owned by a given domain/URI pair.
     *
     * @param ownerDomain The domain that owns the resources.
     * @param ownerURI The specific URI that owns the resources.  This can
     *        be empty if no URI specifically owns the resources.
     * @param count The number of keys in keys.
     * @param keys The keys that the domain/URI pair own.
     */
    void getOwnedKeys(in ACString ownerDomain,
                      in ACString ownerURI,
                      out unsigned long count,
                      [array, size_is(count)]out string keys);

    /**
     * Adds an owned key to a domain/URI pair.
     *
     * A key can be added while there is no associated entry.  When
     * an entry is created with this key, it will be owned by the
     * domain/URI pair.
     *
     * @param ownerDomain The domain that owns the resources.
     * @param ownerURI The specific URI that owns the resources.  This can
     *        be empty if no URI specifically owns the resources.
     * @param key The key to add.
     */
    void addOwnedKey(in ACString ownerDomain,
                     in ACString ownerURI,
                     in ACString key);

    /**
     * Removes an owned key from a domain/URI pair.
     *
     * If the key does not exist, an NS_ERROR_NOT_AVAILABLE exception
     * will be thrown.
     *
     * @param ownerDomain The domain that owns the resources.
     * @param ownerURI The specific URI that owns the resources.  This can
     *        be empty if no URI specifically owns the resources.
     * @param key The key to remove.
     */
    void removeOwnedKey(in ACString ownerDomain,
                        in ACString ownerURI,
                        in ACString key);

    /**
     * Checks whether a key is owned by a given domain/URI pair.
     *
     * @param ownerDomain The domain that owns the resources.
     * @param ownerURI The specific URI that owns the resources.  This can
     *        be empty if no URI specifically owns the resources.
     * @param key The key to check
     */
    boolean keyIsOwned(in ACString ownerDomain,
                       in ACString ownerURI,
                       in ACString key);

    /**
     * Remove all keys owned by a domain, including keys owned by
     * a specific URI.
     *
     * @param domain The domain for which keys should be removed.
     */
    void clearKeysOwnedByDomain(in ACString ownerDomain);

    /**
     * Evict all entries that are not owned by a domain.
     */
    void evictUnownedEntries();
};