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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_V3_H_ | |
| 6 #define NET_DISK_CACHE_BLOCKFILE_EVICTION_V3_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/memory/weak_ptr.h" | |
| 10 #include "net/disk_cache/blockfile/disk_format_v3.h" | |
| 11 #include "net/disk_cache/blockfile/index_table_v3.h" | |
| 12 | |
| 13 namespace disk_cache { | |
| 14 | |
| 15 class BackendImplV3; | |
| 16 class CacheRankingsBlock; | |
| 17 class EntryImplV3; | |
| 18 | |
| 19 namespace Rankings { | |
| 20 typedef int List; | |
| 21 } | |
| 22 | |
| 23 // This class implements the eviction algorithm for the cache and it is tightly | |
| 24 // integrated with BackendImpl. | |
| 25 class EvictionV3 { | |
| 26 public: | |
| 27 EvictionV3(); | |
| 28 ~EvictionV3(); | |
| 29 | |
| 30 void Init(BackendImplV3* backend); | |
| 31 void Stop(); | |
| 32 | |
| 33 // Deletes entries from the cache until the current size is below the limit. | |
| 34 // If empty is true, the whole cache will be trimmed, regardless of being in | |
| 35 // use. | |
| 36 void TrimCache(bool empty); | |
| 37 | |
| 38 // Notifications of interesting events for a given entry. | |
| 39 void OnOpenEntry(EntryImplV3* entry); | |
| 40 void OnCreateEntry(EntryImplV3* 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 bool EvictEntry(CacheRankingsBlock* node, bool empty, Rankings::List list); | |
| 52 | |
| 53 void TrimCacheV2(bool empty); | |
| 54 void TrimDeleted(bool empty); | |
| 55 | |
| 56 bool NodeIsOldEnough(CacheRankingsBlock* node, int list); | |
| 57 int SelectListByLength(); | |
| 58 void ReportListStats(); | |
| 59 | |
| 60 BackendImplV3* backend_; | |
| 61 IndexTable* index_; | |
| 62 IndexHeaderV3* header_; | |
| 63 int max_size_; | |
| 64 int trim_delays_; | |
| 65 bool lru_; | |
| 66 bool first_trim_; | |
| 67 bool trimming_; | |
| 68 bool delay_trim_; | |
| 69 bool init_; | |
| 70 bool test_mode_; | |
| 71 base::WeakPtrFactory<EvictionV3> ptr_factory_; | |
| 72 | |
| 73 DISALLOW_COPY_AND_ASSIGN(EvictionV3); | |
| 74 }; | |
| 75 | |
| 76 } // namespace disk_cache | |
| 77 | |
| 78 #endif // NET_DISK_CACHE_BLOCKFILE_EVICTION_V3_H_ | |
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