1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_BACKEND_VERSION_H_ 6 #define NET_DISK_CACHE_SIMPLE_SIMPLE_BACKEND_VERSION_H_ 7 8 namespace disk_cache { 9 10 // Short rules helping to think about data upgrades within Simple Cache: 11 // * ALL changes of on-disk data format, backward-compatible or not, 12 // forward-compatible or not, require updating the |kSimpleVersion|. 13 // * All cache Upgrades are performed on backend start, must be finished 14 // before the new backend starts processing any incoming operations. 15 // * If the Upgrade is not implemented for transition from 16 // |kSimpleVersion - 1| then the whole cache directory will be cleared. 17 // * Dropping cache data on disk or some of its parts can be a valid way to 18 // Upgrade. 19 const uint32 kSimpleVersion = 6; 20 21 // The version of the entry file(s) as written to disk. Must be updated iff the 22 // entry format changes with the overall backend version update. 23 const uint32 kSimpleEntryVersionOnDisk = 5; 24 25 } // namespace disk_cache 26 27 #endif // NET_DISK_CACHE_SIMPLE_SIMPLE_BACKEND_VERSION_H_ 28