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- /* -*- 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 nsICache.idl, released
- * February 23, 2001.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 2001
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- * Gordon Sheridan <gordon@netscape.com>
- * Patrick Beard <beard@netscape.com>
- * Darin Fisher <darin@netscape.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
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * 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"
-
- typedef long nsCacheStoragePolicy;
- typedef long nsCacheAccessMode;
-
- /**
- * nsICache is a namespace for various cache constants. It does not represent
- * an actual object.
- */
- [scriptable, uuid(ec1c0063-197d-44bb-84ba-7525d50fc937)]
- interface nsICache
- {
- /**
- * Access Modes
- *
- *
- * Mode Requested | Not Cached | Cached
- * ------------------------------------------------------------------------
- * READ | KEY_NOT_FOUND | NS_OK
- * | Mode = NONE | Mode = READ
- * | No Descriptor | Descriptor
- * ------------------------------------------------------------------------
- * WRITE | NS_OK | NS_OK (Cache service
- * | Mode = WRITE | Mode = WRITE dooms existing
- * | Descriptor | Descriptor cache entry)
- * ------------------------------------------------------------------------
- * READ_WRITE | NS_OK | NS_OK
- * (1st req.) | Mode = WRITE | Mode = READ_WRITE
- * | Descriptor | Descriptor
- * ------------------------------------------------------------------------
- * READ_WRITE | N/A | NS_OK
- * (Nth req.) | | Mode = READ
- * | | Descriptor
- * ------------------------------------------------------------------------
- *
- *
- * Access Requested:
- *
- * READ - I only want to READ, if there isn't an entry just fail
- * WRITE - I have something new I want to write into the cache, make
- * me a new entry and doom the old one, if any.
- * READ_WRITE - I want to READ, but I'm willing to update an existing
- * entry if necessary, or create a new one if none exists.
- *
- *
- * Access Granted:
- *
- * NONE - No descriptor is provided. You get zilch. Nada. Nothing.
- * READ - You can READ from this descriptor.
- * WRITE - You must WRITE to this descriptor because the cache entry
- * was just created for you.
- * READ_WRITE - You can READ the descriptor to determine if it's valid,
- * you may WRITE if it needs updating.
- *
- *
- * Comments:
- *
- * If you think that you might need to modify cached data or meta data,
- * then you must open a cache entry requesting WRITE access. Only one
- * cache entry descriptor, per cache entry, will be granted WRITE access.
- *
- * Usually, you will request READ_WRITE access in order to first test the
- * meta data and informational fields to determine if a write (ie. going
- * to the net) may actually be necessary. If you determine that it is
- * not, then you would mark the cache entry as valid (using MarkValid) and
- * then simply read the data from the cache.
- *
- * A descriptor granted WRITE access has exclusive access to the cache
- * entry up to the point at which it marks it as valid. Once the cache
- * entry has been "validated", other descriptors with READ access may be
- * opened to the cache entry.
- *
- * If you make a request for READ_WRITE access to a cache entry, the cache
- * service will downgrade your access to READ if there is already a
- * cache entry descriptor open with WRITE access.
- *
- * If you make a request for only WRITE access to a cache entry and another
- * descriptor with WRITE access is currently open, then the existing cache
- * entry will be 'doomed', and you will be given a descriptor (with WRITE
- * access only) to a new cache entry.
- *
- */
- const nsCacheAccessMode ACCESS_NONE = 0;
- const nsCacheAccessMode ACCESS_READ = 1;
- const nsCacheAccessMode ACCESS_WRITE = 2;
- const nsCacheAccessMode ACCESS_READ_WRITE = 3;
-
- /**
- * Storage Policy
- *
- * The storage policy of a cache entry determines the device(s) to which
- * it belongs. See nsICacheSession and nsICacheEntryDescriptor for more
- * details.
- *
- * STORE_ANYWHERE - Allows the cache entry to be stored in any device.
- * The cache service decides which cache device to use
- * based on "some resource management calculation."
- * STORE_IN_MEMORY - Requires the cache entry to reside in non-persistent
- * storage (ie. typically in system RAM).
- * STORE_ON_DISK - Requires the cache entry to reside in persistent
- * storage (ie. typically on a system's hard disk).
- * STORE_ON_DISK_AS_DISK - Requires the cache entry to reside in persistent
- * storage, and in a specific file.
- */
- const nsCacheStoragePolicy STORE_ANYWHERE = 0;
- const nsCacheStoragePolicy STORE_IN_MEMORY = 1;
- const nsCacheStoragePolicy STORE_ON_DISK = 2;
- const nsCacheStoragePolicy STORE_ON_DISK_AS_FILE = 3;
-
- /**
- * All entries for a cache session are stored as streams of data or
- * as objects. These constant my be used to specify the type of entries
- * when calling nsICacheService::CreateSession().
- */
- const long NOT_STREAM_BASED = 0;
- const long STREAM_BASED = 1;
-
- /**
- * The synchronous OpenCacheEntry() may be blocking or non-blocking. If a cache entry is
- * waiting to be validated by another cache descriptor (so no new cache descriptors for that
- * key can be created, OpenCacheEntry() will return NS_ERROR_CACHE_WAIT_FOR_VALIDATION in
- * non-blocking mode. In blocking mode, it will wait until the cache entry for the key has
- * been validated or doomed. If the cache entry is validated, then a descriptor for that
- * entry will be created and returned. If the cache entry was doomed, then a descriptor
- * will be created for a new cache entry for the key.
- */
- const long NON_BLOCKING = 0;
- const long BLOCKING = 1;
- };
-
- %{C++
- #include "nsNetError.h"
- %}
-