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184 lines
8.2 KiB
Plaintext
184 lines
8.2 KiB
Plaintext
/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is nsICache.idl, released
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* February 23, 2001.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2001
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Gordon Sheridan <gordon@netscape.com>
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* Patrick Beard <beard@netscape.com>
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* Darin Fisher <darin@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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typedef long nsCacheStoragePolicy;
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typedef long nsCacheAccessMode;
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/**
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* nsICache is a namespace for various cache constants. It does not represent
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* an actual object.
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*/
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[scriptable, uuid(ec1c0063-197d-44bb-84ba-7525d50fc937)]
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interface nsICache
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{
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/**
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* Access Modes
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*
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*
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* Mode Requested | Not Cached | Cached
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* ------------------------------------------------------------------------
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* READ | KEY_NOT_FOUND | NS_OK
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* | Mode = NONE | Mode = READ
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* | No Descriptor | Descriptor
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* ------------------------------------------------------------------------
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* WRITE | NS_OK | NS_OK (Cache service
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* | Mode = WRITE | Mode = WRITE dooms existing
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* | Descriptor | Descriptor cache entry)
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* ------------------------------------------------------------------------
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* READ_WRITE | NS_OK | NS_OK
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* (1st req.) | Mode = WRITE | Mode = READ_WRITE
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* | Descriptor | Descriptor
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* ------------------------------------------------------------------------
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* READ_WRITE | N/A | NS_OK
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* (Nth req.) | | Mode = READ
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* | | Descriptor
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* ------------------------------------------------------------------------
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*
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*
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* Access Requested:
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*
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* READ - I only want to READ, if there isn't an entry just fail
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* WRITE - I have something new I want to write into the cache, make
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* me a new entry and doom the old one, if any.
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* READ_WRITE - I want to READ, but I'm willing to update an existing
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* entry if necessary, or create a new one if none exists.
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*
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*
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* Access Granted:
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*
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* NONE - No descriptor is provided. You get zilch. Nada. Nothing.
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* READ - You can READ from this descriptor.
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* WRITE - You must WRITE to this descriptor because the cache entry
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* was just created for you.
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* READ_WRITE - You can READ the descriptor to determine if it's valid,
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* you may WRITE if it needs updating.
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*
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*
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* Comments:
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*
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* If you think that you might need to modify cached data or meta data,
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* then you must open a cache entry requesting WRITE access. Only one
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* cache entry descriptor, per cache entry, will be granted WRITE access.
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*
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* Usually, you will request READ_WRITE access in order to first test the
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* meta data and informational fields to determine if a write (ie. going
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* to the net) may actually be necessary. If you determine that it is
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* not, then you would mark the cache entry as valid (using MarkValid) and
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* then simply read the data from the cache.
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*
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* A descriptor granted WRITE access has exclusive access to the cache
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* entry up to the point at which it marks it as valid. Once the cache
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* entry has been "validated", other descriptors with READ access may be
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* opened to the cache entry.
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*
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* If you make a request for READ_WRITE access to a cache entry, the cache
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* service will downgrade your access to READ if there is already a
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* cache entry descriptor open with WRITE access.
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*
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* If you make a request for only WRITE access to a cache entry and another
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* descriptor with WRITE access is currently open, then the existing cache
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* entry will be 'doomed', and you will be given a descriptor (with WRITE
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* access only) to a new cache entry.
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*
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*/
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const nsCacheAccessMode ACCESS_NONE = 0;
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const nsCacheAccessMode ACCESS_READ = 1;
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const nsCacheAccessMode ACCESS_WRITE = 2;
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const nsCacheAccessMode ACCESS_READ_WRITE = 3;
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/**
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* Storage Policy
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*
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* The storage policy of a cache entry determines the device(s) to which
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* it belongs. See nsICacheSession and nsICacheEntryDescriptor for more
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* details.
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*
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* STORE_ANYWHERE - Allows the cache entry to be stored in any device.
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* The cache service decides which cache device to use
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* based on "some resource management calculation."
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* STORE_IN_MEMORY - Requires the cache entry to reside in non-persistent
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* storage (ie. typically in system RAM).
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* STORE_ON_DISK - Requires the cache entry to reside in persistent
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* storage (ie. typically on a system's hard disk).
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* STORE_ON_DISK_AS_FILE - Requires the cache entry to reside in persistent
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* storage, and in a separate file.
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* STORE_OFFLINE - Requires the cache entry to reside in persistent,
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* reliable storage for offline use.
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*/
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const nsCacheStoragePolicy STORE_ANYWHERE = 0;
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const nsCacheStoragePolicy STORE_IN_MEMORY = 1;
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const nsCacheStoragePolicy STORE_ON_DISK = 2;
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const nsCacheStoragePolicy STORE_ON_DISK_AS_FILE = 3;
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const nsCacheStoragePolicy STORE_OFFLINE = 4;
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/**
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* All entries for a cache session are stored as streams of data or
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* as objects. These constant my be used to specify the type of entries
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* when calling nsICacheService::CreateSession().
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*/
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const long NOT_STREAM_BASED = 0;
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const long STREAM_BASED = 1;
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/**
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* The synchronous OpenCacheEntry() may be blocking or non-blocking. If a cache entry is
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* waiting to be validated by another cache descriptor (so no new cache descriptors for that
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* key can be created, OpenCacheEntry() will return NS_ERROR_CACHE_WAIT_FOR_VALIDATION in
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* non-blocking mode. In blocking mode, it will wait until the cache entry for the key has
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* been validated or doomed. If the cache entry is validated, then a descriptor for that
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* entry will be created and returned. If the cache entry was doomed, then a descriptor
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* will be created for a new cache entry for the key.
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*/
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const long NON_BLOCKING = 0;
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const long BLOCKING = 1;
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/**
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* Constant meaning no expiration time.
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*/
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const unsigned long NO_EXPIRATION_TIME = 0xFFFFFFFF;
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};
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%{C++
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#include "nsNetError.h"
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%}
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