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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_DISK_CACHE_EVICTION_H_
#define NET_DISK_CACHE_EVICTION_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/task.h"
#include "net/disk_cache/disk_format.h"
#include "net/disk_cache/rankings.h"
namespace disk_cache {
class BackendImpl;
class EntryImpl;
// This class implements the eviction algorithm for the cache and it is tightly
// integrated with BackendImpl.
class Eviction {
public:
Eviction() : backend_(NULL), ALLOW_THIS_IN_INITIALIZER_LIST(factory_(this)) {}
~Eviction() {}
void Init(BackendImpl* backend);
// Deletes entries from the cache until the current size is below the limit.
// If empty is true, the whole cache will be trimmed, regardless of being in
// use.
void TrimCache(bool empty);
// Updates the ranking information for an entry.
void UpdateRank(EntryImpl* entry, bool modified);
// Notifications of interesting events for a given entry.
void OnOpenEntry(EntryImpl* entry);
void OnCreateEntry(EntryImpl* entry);
void OnDoomEntry(EntryImpl* entry);
void OnDestroyEntry(EntryImpl* entry);
private:
void ReportTrimTimes(EntryImpl* entry);
Rankings::List GetListForEntry(EntryImpl* entry);
BackendImpl* backend_;
Rankings* rankings_;
IndexHeader* header_;
int max_size_;
ScopedRunnableMethodFactory<Eviction> factory_;
DISALLOW_COPY_AND_ASSIGN(Eviction);
};
} // namespace disk_cache
#endif // NET_DISK_CACHE_EVICTION_H_
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