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1 // Copyright (c) 2009 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 CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_CHANGES_VERSION_H_ | |
6 #define CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_CHANGES_VERSION_H_ | |
7 #pragma once | |
8 | |
9 namespace syncable { | |
10 | |
11 // For the most part, the sync engine treats version numbers as opaque values. | |
12 // However, there are parts of our code base that break this abstraction, and | |
13 // depend on the following two invariants: | |
14 // | |
15 // 1. CHANGES_VERSION is less than 0. | |
16 // 2. The server only issues positive version numbers. | |
17 // | |
18 // Breaking these abstractions makes some operations 10 times | |
19 // faster. If either of these invariants change, then those queries | |
20 // must be revisited. | |
21 | |
22 enum { | |
23 CHANGES_VERSION = -1 | |
24 }; | |
25 | |
26 #define CHANGES_VERSION_STRING "-1" | |
27 | |
28 } // namespace syncable | |
29 | |
30 #endif // CHROME_BROWSER_SYNC_SYNCABLE_SYNCABLE_CHANGES_VERSION_H_ | |
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