net/disk_cache/memory/mem_rankings.h

   1 // Copyright (c) 2010 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 // See net/disk_cache/disk_cache.h for the public interface.
   6
   7 #ifndef NET_DISK_CACHE_MEMORY_MEM_RANKINGS_H_
   8 #define NET_DISK_CACHE_MEMORY_MEM_RANKINGS_H_
   9
  10 #include "base/basictypes.h"
  11
  12 namespace disk_cache {
  13
  14 class MemEntryImpl;
  15
  16 // This class handles the ranking information for the memory-only cache.
  17 class MemRankings {
  18  public:
  19   MemRankings() : head_(NULL), tail_(NULL) {}
  20   ~MemRankings();
  21
  22   // Inserts a given entry at the head of the queue.
  23   void Insert(MemEntryImpl* node);
  24
  25   // Removes a given entry from the LRU list.
  26   void Remove(MemEntryImpl* node);
  27
  28   // Moves a given entry to the head.
  29   void UpdateRank(MemEntryImpl* node);
  30
  31   // Iterates through the list.
  32   MemEntryImpl* GetNext(MemEntryImpl* node);
  33   MemEntryImpl* GetPrev(MemEntryImpl* node);
  34
  35  private:
  36   MemEntryImpl* head_;
  37   MemEntryImpl* tail_;
  38
  39   DISALLOW_COPY_AND_ASSIGN(MemRankings);
  40 };
  41
  42 }  // namespace disk_cache
  43
  44 #endif  // NET_DISK_CACHE_MEMORY_MEM_RANKINGS_H_