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194 lines
6.9 KiB
Plaintext
194 lines
6.9 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 nsICacheEntryDescriptor.idl, released
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* February 10, 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 "nsICacheVisitor.idl"
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#include "nsICache.idl"
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interface nsISimpleEnumerator;
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interface nsICacheListener;
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interface nsIInputStream;
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interface nsIOutputStream;
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interface nsIFile;
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interface nsICacheMetaDataVisitor;
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[scriptable, uuid(49c1a11d-f5d2-4f09-8262-551e64908ada)]
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interface nsICacheEntryDescriptor : nsICacheEntryInfo
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{
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/**
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* Set the time at which the cache entry should be considered invalid (in
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* seconds since the Epoch).
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*/
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void setExpirationTime(in PRUint32 expirationTime);
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/**
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* Set the cache entry data size. This will fail if the cache entry
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* IS stream based.
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*/
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void setDataSize(in unsigned long size);
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/**
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* Open blocking input stream to cache data. This will fail if the cache
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* entry IS NOT stream based. Use the stream transport service to
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* asynchronously read this stream on a background thread. The returned
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* stream MAY implement nsISeekableStream.
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*
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* @param offset
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* read starting from this offset into the cached data. an offset
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* beyond the end of the stream has undefined consequences.
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*
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* @return blocking, unbuffered input stream.
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*/
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nsIInputStream openInputStream(in unsigned long offset);
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/**
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* Open blocking output stream to cache data. This will fail if the cache
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* entry IS NOT stream based. Use the stream transport service to
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* asynchronously write to this stream on a background thread. The returned
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* stream MAY implement nsISeekableStream.
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*
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* If opening an output stream to existing cached data, the data will be
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* truncated to the specified offset.
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*
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* @param offset
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* write starting from this offset into the cached data. an offset
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* beyond the end of the stream has undefined consequences.
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*
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* @return blocking, unbuffered output stream.
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*/
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nsIOutputStream openOutputStream(in unsigned long offset);
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/**
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* Get/set the cache data element. This will fail if the cache entry
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* IS stream based. The cache entry holds a strong reference to this
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* object. The object will be released when the cache entry is destroyed.
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*/
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attribute nsISupports cacheElement;
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/**
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* Stores the Content-Length specified in the HTTP header for this
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* entry. Checked before we write to the cache entry, to prevent ever
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* taking up space in the cache for an entry that we know up front
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* is going to have to be evicted anyway. See bug 588507.
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*/
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attribute PRInt64 predictedDataSize;
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/**
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* Get the access granted to this descriptor. See nsICache.idl for the
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* definitions of the access modes and a thorough description of their
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* corresponding meanings.
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*/
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readonly attribute nsCacheAccessMode accessGranted;
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/**
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* Get/set the storage policy of the cache entry. See nsICache.idl for
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* the definitions of the storage policies.
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*/
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attribute nsCacheStoragePolicy storagePolicy;
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/**
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* Get the disk file associated with the cache entry.
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*/
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readonly attribute nsIFile file;
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/**
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* Get/set security info on the cache entry for this descriptor. This fails
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* if the storage policy is not STORE_IN_MEMORY.
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*/
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attribute nsISupports securityInfo;
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/**
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* Get the size of the cache entry data, as stored. This may differ
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* from the entry's dataSize, if the entry is compressed.
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*/
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readonly attribute unsigned long storageDataSize;
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/**
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* Doom the cache entry this descriptor references in order to slate it for
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* removal. Once doomed a cache entry cannot be undoomed.
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*
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* A descriptor with WRITE access can doom the cache entry and choose to
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* fail pending requests. This means that pending requests will not get
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* a cache descriptor. This is meant as a tool for clients that wish to
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* instruct pending requests to skip the cache.
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*/
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void doom();
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void doomAndFailPendingRequests(in nsresult status);
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/**
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* A writer must validate this cache object before any readers are given
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* a descriptor to the object.
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*/
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void markValid();
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/**
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* Explicitly close the descriptor (optional).
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*/
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void close();
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/**
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* Methods for accessing meta data. Meta data is a table of key/value
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* string pairs. The strings do not have to conform to any particular
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* charset, but they must be null terminated.
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*/
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string getMetaDataElement(in string key);
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void setMetaDataElement(in string key, in string value);
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/**
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* Visitor will be called with key/value pair for each meta data element.
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*/
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void visitMetaData(in nsICacheMetaDataVisitor visitor);
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};
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[scriptable, uuid(22f9a49c-3cf8-4c23-8006-54efb11ac562)]
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interface nsICacheMetaDataVisitor : nsISupports
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{
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/**
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* Called for each key/value pair in the meta data for a cache entry
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*/
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boolean visitMetaDataElement(in string key,
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in string value);
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};
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