/usr/share/idl/thunderbird/nsICache.idl is in thunderbird-dev 1:52.8.0-1~deb8u1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | /* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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(d6c67f38-b39a-4582-8a48-4c4f8a56dfd0)]
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_OFFLINE - Requires the cache entry to reside in persistent,
* reliable storage for offline use.
*/
const nsCacheStoragePolicy STORE_ANYWHERE = 0;
const nsCacheStoragePolicy STORE_IN_MEMORY = 1;
const nsCacheStoragePolicy STORE_ON_DISK = 2;
// value 3 was used by STORE_ON_DISK_AS_FILE which was removed
const nsCacheStoragePolicy STORE_OFFLINE = 4;
/**
* 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;
/**
* Constant meaning no expiration time.
*/
const unsigned long NO_EXPIRATION_TIME = 0xFFFFFFFF;
};
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