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Side by Side Diff: net/disk_cache/blockfile/eviction.h

Issue 992733002: Remove //net (except for Android test stuff) and sdch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 9 months ago
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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 #ifndef NET_DISK_CACHE_BLOCKFILE_EVICTION_H_
6 #define NET_DISK_CACHE_BLOCKFILE_EVICTION_H_
7
8 #include "base/basictypes.h"
9 #include "base/memory/weak_ptr.h"
10 #include "net/disk_cache/blockfile/rankings.h"
11
12 namespace disk_cache {
13
14 class BackendImpl;
15 class EntryImpl;
16 struct IndexHeader;
17
18 // This class implements the eviction algorithm for the cache and it is tightly
19 // integrated with BackendImpl.
20 class Eviction {
21 public:
22 Eviction();
23 ~Eviction();
24
25 void Init(BackendImpl* backend);
26 void Stop();
27
28 // Deletes entries from the cache until the current size is below the limit.
29 // If empty is true, the whole cache will be trimmed, regardless of being in
30 // use.
31 void TrimCache(bool empty);
32
33 // Updates the ranking information for an entry.
34 void UpdateRank(EntryImpl* entry, bool modified);
35
36 // Notifications of interesting events for a given entry.
37 void OnOpenEntry(EntryImpl* entry);
38 void OnCreateEntry(EntryImpl* entry);
39 void OnDoomEntry(EntryImpl* entry);
40 void OnDestroyEntry(EntryImpl* entry);
41
42 // Testing interface.
43 void SetTestMode();
44 void TrimDeletedList(bool empty);
45
46 private:
47 void PostDelayedTrim();
48 void DelayedTrim();
49 bool ShouldTrim();
50 bool ShouldTrimDeleted();
51 void ReportTrimTimes(EntryImpl* entry);
52 Rankings::List GetListForEntry(EntryImpl* entry);
53 bool EvictEntry(CacheRankingsBlock* node, bool empty, Rankings::List list);
54
55 // We'll just keep for a while a separate set of methods that implement the
56 // new eviction algorithm. This code will replace the original methods when
57 // finished.
58 void TrimCacheV2(bool empty);
59 void UpdateRankV2(EntryImpl* entry, bool modified);
60 void OnOpenEntryV2(EntryImpl* entry);
61 void OnCreateEntryV2(EntryImpl* entry);
62 void OnDoomEntryV2(EntryImpl* entry);
63 void OnDestroyEntryV2(EntryImpl* entry);
64 Rankings::List GetListForEntryV2(EntryImpl* entry);
65 void TrimDeleted(bool empty);
66 bool RemoveDeletedNode(CacheRankingsBlock* node);
67
68 bool NodeIsOldEnough(CacheRankingsBlock* node, int list);
69 int SelectListByLength(Rankings::ScopedRankingsBlock* next);
70 void ReportListStats();
71
72 BackendImpl* backend_;
73 Rankings* rankings_;
74 IndexHeader* header_;
75 int max_size_;
76 int trim_delays_;
77 int index_size_;
78 bool new_eviction_;
79 bool first_trim_;
80 bool trimming_;
81 bool delay_trim_;
82 bool init_;
83 bool test_mode_;
84 base::WeakPtrFactory<Eviction> ptr_factory_;
85
86 DISALLOW_COPY_AND_ASSIGN(Eviction);
87 };
88
89 } // namespace disk_cache
90
91 #endif // NET_DISK_CACHE_BLOCKFILE_EVICTION_H_
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