Home | History | Annotate | Download | only in disk_cache
      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_MEM_RANKINGS_H__
      8 #define NET_DISK_CACHE_MEM_RANKINGS_H__
      9 #pragma once
     10 
     11 #include "base/basictypes.h"
     12 
     13 namespace disk_cache {
     14 
     15 class MemEntryImpl;
     16 
     17 // This class handles the ranking information for the memory-only cache.
     18 class MemRankings {
     19  public:
     20   MemRankings() : head_(NULL), tail_(NULL) {}
     21   ~MemRankings();
     22 
     23   // Inserts a given entry at the head of the queue.
     24   void Insert(MemEntryImpl* node);
     25 
     26   // Removes a given entry from the LRU list.
     27   void Remove(MemEntryImpl* node);
     28 
     29   // Moves a given entry to the head.
     30   void UpdateRank(MemEntryImpl* node);
     31 
     32   // Iterates through the list.
     33   MemEntryImpl* GetNext(MemEntryImpl* node);
     34   MemEntryImpl* GetPrev(MemEntryImpl* node);
     35 
     36  private:
     37   MemEntryImpl* head_;
     38   MemEntryImpl* tail_;
     39 
     40   DISALLOW_COPY_AND_ASSIGN(MemRankings);
     41 };
     42 
     43 }  // namespace disk_cache
     44 
     45 #endif  // NET_DISK_CACHE_MEM_RANKINGS_H__
     46