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159 lines
6.8 KiB
Plaintext
159 lines
6.8 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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 mozilla.org code.
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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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* Darin Fisher <darin@netscape.com> (original author)
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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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interface nsIFile;
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/**
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* A channel may optionally implement this interface to allow clients
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* to affect its behavior with respect to how it uses the cache service.
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*
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* This interface provides:
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* 1) Support for "stream as file" semantics (for JAR and plugins).
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* 2) Support for "pinning" cached data in the cache (for printing and save-as).
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* 3) Support for uniquely identifying cached data in cases when the URL
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* is insufficient (e.g., HTTP form submission).
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*/
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[scriptable, uuid(855bcc4d-0987-45b6-b138-3bf0bf407703)]
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interface nsICachingChannel : nsISupports
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{
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/**
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* Set/get the cache token... uniquely identifies the data in the cache.
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* Holding a reference to this token prevents the cached data from being
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* removed.
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*
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* A cache token retrieved from a particular instance of nsICachingChannel
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* could be set on another instance of nsICachingChannel provided the
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* underlying implementations are compatible. The implementation of
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* nsICachingChannel would be expected to only read from the cache entry
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* identified by the cache token and not try to validate it.
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*
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* The cache token can be QI'd to a nsICacheEntryInfo if more detail
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* about the cache entry is needed (e.g., expiration time).
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*/
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attribute nsISupports cacheToken;
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/**
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* Set/get the cache key... uniquely identifies the data in the cache
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* for this channel. Holding a reference to this key does NOT prevent
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* the cached data from being removed.
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*
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* A cache key retrieved from a particular instance of nsICachingChannel
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* could be set on another instance of nsICachingChannel provided the
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* underlying implementations are compatible and provided the new
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* channel instance was created with the same URI. The implementation of
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* nsICachingChannel would be expected to use the cache entry identified
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* by the cache token. Depending on the value of nsIRequest::loadFlags,
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* the cache entry may be validated, overwritten, or simply read.
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*
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* The cache key may be NULL indicating that the URI of the channel is
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* sufficient to locate the same cache entry. Setting a NULL cache key
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* is likewise valid.
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*/
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attribute nsISupports cacheKey;
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/**
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* Specifies whether or not the data should be cached to a file. This
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* may fail if the disk cache is not present. The value of this attribute
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* is usually only settable during the processing of a channel's
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* OnStartRequest. The default value of this attribute depends on the
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* particular implementation of nsICachingChannel.
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*/
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attribute boolean cacheAsFile;
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/**
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* Specifies whether or not the data should be placed in the offline cache,
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* in addition to normal memory/disk caching. This may fail if the offline
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* cache is not present. The value of this attribute should be set before
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* opening the channel.
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*/
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attribute boolean cacheForOfflineUse;
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/**
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* Get the "file" where the cached data can be found. This is valid for
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* as long as a reference to the cache token is held. This may return
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* an error if cacheAsFile is false.
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*/
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readonly attribute nsIFile cacheFile;
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/**
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* TRUE if this channel's data is being loaded from the cache. This value
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* is undefined before the channel fires its OnStartRequest notification
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* and after the channel fires its OnStopRequest notification.
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*/
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boolean isFromCache();
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/**************************************************************************
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* Caching channel specific load flags:
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*/
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/**
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* This load flag causes the local cache to be skipped when fetching a
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* request. Unlike LOAD_BYPASS_CACHE, it does not force an end-to-end load
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* (i.e., it does not affect proxy caches).
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*/
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const unsigned long LOAD_BYPASS_LOCAL_CACHE = 1 << 28;
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/**
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* This load flag causes the local cache to be skipped if the request
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* would otherwise block waiting to access the cache.
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*/
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const unsigned long LOAD_BYPASS_LOCAL_CACHE_IF_BUSY = 1 << 29;
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/**
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* This load flag inhibits fetching from the net if the data in the cache
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* has been evicted. An error of NS_ERROR_DOCUMENT_NOT_CACHED will be sent
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* to the listener's onStopRequest in this case.
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*/
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const unsigned long LOAD_ONLY_FROM_CACHE = 1 << 30;
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/**
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* This load flag controls what happens when a document would be loaded
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* from the cache to satisfy a call to AsyncOpen. If this attribute is
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* set to TRUE, then the document will not be loaded from the cache. A
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* stream listener can check nsICachingChannel::isFromCache to determine
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* if the AsyncOpen will actually result in data being streamed.
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*
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* If this flag has been set, and the request can be satisfied via the
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* cache, then the OnDataAvailable events will be skipped. The listener
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* will only see OnStartRequest followed by OnStopRequest.
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*/
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const unsigned long LOAD_ONLY_IF_MODIFIED = 1 << 31;
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};
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