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1 // Copyright (c) 2012 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 #include "chrome/browser/sync/engine/cleanup_disabled_types_command.h" | |
6 | |
7 #include <algorithm> | |
8 | |
9 #include "chrome/browser/sync/sessions/sync_session.h" | |
10 #include "chrome/browser/sync/sessions/sync_session_context.h" | |
11 #include "chrome/browser/sync/syncable/model_type.h" | |
12 #include "chrome/browser/sync/syncable/syncable.h" | |
13 | |
14 namespace browser_sync { | |
15 | |
16 CleanupDisabledTypesCommand::CleanupDisabledTypesCommand() {} | |
17 CleanupDisabledTypesCommand::~CleanupDisabledTypesCommand() {} | |
18 | |
19 SyncerError CleanupDisabledTypesCommand::ExecuteImpl( | |
20 sessions::SyncSession* session) { | |
21 using syncable::ModelTypeSet; | |
22 using syncable::ModelTypeSetToString; | |
23 // Because a full directory purge is slow, we avoid purging | |
24 // undesired types unless we have reason to believe they were | |
25 // previously enabled. Because purging could theoretically fail on | |
26 // the first sync session (when there's no previous routing info) we | |
27 // pay the full directory scan price once and do a "deep clean" of | |
28 // types that may potentially need cleanup so that we converge to | |
29 // the correct state. | |
30 // | |
31 // in_previous | !in_previous | |
32 // | | |
33 // initial_sync_ended should clean | may have attempted cleanup | |
34 // !initial_sync_ended should clean | may have never been enabled, or | |
35 // | could have been disabled before | |
36 // | initial sync ended and cleanup | |
37 // | may not have happened yet | |
38 // | (failure, browser restart | |
39 // | before another sync session,..) | |
40 | |
41 const ModelTypeSet enabled_types = | |
42 GetRoutingInfoTypes(session->routing_info()); | |
43 | |
44 const ModelTypeSet previous_enabled_types = | |
45 GetRoutingInfoTypes( | |
46 session->context()->previous_session_routing_info()); | |
47 | |
48 ModelTypeSet to_cleanup = Difference(ModelTypeSet::All(), enabled_types); | |
49 | |
50 // If |previous_enabled_types| is non-empty (i.e., not the first | |
51 // sync session), set |to_cleanup| to its intersection with | |
52 // |previous_enabled_types|. | |
53 if (!previous_enabled_types.Empty()) { | |
54 to_cleanup.RetainAll(previous_enabled_types); | |
55 } | |
56 | |
57 DVLOG(1) << "enabled_types = " << ModelTypeSetToString(enabled_types) | |
58 << ", previous_enabled_types = " | |
59 << ModelTypeSetToString(previous_enabled_types) | |
60 << ", to_cleanup = " << ModelTypeSetToString(to_cleanup); | |
61 | |
62 if (to_cleanup.Empty()) | |
63 return SYNCER_OK; | |
64 | |
65 session->context()->directory()->PurgeEntriesWithTypeIn(to_cleanup); | |
66 return SYNCER_OK; | |
67 } | |
68 | |
69 } // namespace browser_sync | |
70 | |
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