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92 lines
2.6 KiB
C++
92 lines
2.6 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_DISK_CACHE_BLOCKFILE_EVICTION_H_
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#define NET_DISK_CACHE_BLOCKFILE_EVICTION_H_
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#include "base/macros.h"
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#include "base/memory/weak_ptr.h"
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#include "net/disk_cache/blockfile/rankings.h"
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namespace disk_cache {
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class BackendImpl;
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class EntryImpl;
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struct IndexHeader;
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// This class implements the eviction algorithm for the cache and it is tightly
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// integrated with BackendImpl.
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class Eviction {
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public:
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Eviction();
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~Eviction();
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void Init(BackendImpl* backend);
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void Stop();
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// Deletes entries from the cache until the current size is below the limit.
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// If empty is true, the whole cache will be trimmed, regardless of being in
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// use.
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void TrimCache(bool empty);
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// Updates the ranking information for an entry.
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void UpdateRank(EntryImpl* entry, bool modified);
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// Notifications of interesting events for a given entry.
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void OnOpenEntry(EntryImpl* entry);
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void OnCreateEntry(EntryImpl* entry);
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void OnDoomEntry(EntryImpl* entry);
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void OnDestroyEntry(EntryImpl* entry);
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// Testing interface.
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void SetTestMode();
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void TrimDeletedList(bool empty);
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private:
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void PostDelayedTrim();
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void DelayedTrim();
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bool ShouldTrim();
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bool ShouldTrimDeleted();
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void ReportTrimTimes(EntryImpl* entry);
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Rankings::List GetListForEntry(EntryImpl* entry);
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bool EvictEntry(CacheRankingsBlock* node, bool empty, Rankings::List list);
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// We'll just keep for a while a separate set of methods that implement the
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// new eviction algorithm. This code will replace the original methods when
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// finished.
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void TrimCacheV2(bool empty);
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void UpdateRankV2(EntryImpl* entry, bool modified);
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void OnOpenEntryV2(EntryImpl* entry);
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void OnCreateEntryV2(EntryImpl* entry);
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void OnDoomEntryV2(EntryImpl* entry);
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void OnDestroyEntryV2(EntryImpl* entry);
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Rankings::List GetListForEntryV2(EntryImpl* entry);
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void TrimDeleted(bool empty);
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bool RemoveDeletedNode(CacheRankingsBlock* node);
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bool NodeIsOldEnough(CacheRankingsBlock* node, int list);
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int SelectListByLength(Rankings::ScopedRankingsBlock* next);
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void ReportListStats();
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BackendImpl* backend_;
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Rankings* rankings_;
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IndexHeader* header_;
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int max_size_;
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int trim_delays_;
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int index_size_;
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bool new_eviction_;
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bool first_trim_;
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bool trimming_;
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bool delay_trim_;
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bool init_;
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bool test_mode_;
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base::WeakPtrFactory<Eviction> ptr_factory_;
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DISALLOW_COPY_AND_ASSIGN(Eviction);
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};
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} // namespace disk_cache
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#endif // NET_DISK_CACHE_BLOCKFILE_EVICTION_H_
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