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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 // This file contains a template for a Most Recently Used cache that allows | 5 // This file contains a template for a Most Recently Used cache that allows |
| 6 // constant-time access to items using a key, but easy identification of the | 6 // constant-time access to items using a key, but easy identification of the |
| 7 // least-recently-used items for removal. Each key can only be associated with | 7 // least-recently-used items for removal. Each key can only be associated with |
| 8 // one payload item at a time. | 8 // one payload item at a time. |
| 9 // | 9 // |
| 10 // The key object will be stored twice, so it should support efficient copying. | 10 // The key object will be stored twice, so it should support efficient copying. |
| 11 // | 11 // |
| 12 // NOTE: While all operations are O(1), this code is written for | 12 // NOTE: While all operations are O(1), this code is written for |
| 13 // legibility rather than optimality. If future profiling identifies this as | 13 // legibility rather than optimality. If future profiling identifies this as |
| 14 // a bottleneck, there is room for smaller values of 1 in the O(1). :] | 14 // a bottleneck, there is room for smaller values of 1 in the O(1). :] |
| 15 | 15 |
| 16 #ifndef CHROME_COMMON_MRU_CACHE_H__ | 16 #ifndef CHROME_COMMON_MRU_CACHE_H__ |
| 17 #define CHROME_COMMON_MRU_CACHE_H__ | 17 #define CHROME_COMMON_MRU_CACHE_H__ |
| 18 | 18 |
| 19 #include <list> | 19 #include <list> |
| 20 #include <map> | 20 #include <map> |
| 21 #include <utility> | 21 #include <utility> |
| 22 | 22 |
| 23 #include "base/basictypes.h" | 23 #include "base/basictypes.h" |
| 24 #include "chrome/common/logging_chrome.h" | 24 #include "base/logging.h" |
| 25 | 25 |
| 26 // MRUCacheBase ---------------------------------------------------------------- | 26 // MRUCacheBase ---------------------------------------------------------------- |
| 27 | 27 |
| 28 // Base class for the MRU cache specializations defined below. | 28 // Base class for the MRU cache specializations defined below. |
| 29 // The deletor will get called on all payloads that are being removed or | 29 // The deletor will get called on all payloads that are being removed or |
| 30 // replaced. | 30 // replaced. |
| 31 template <class KeyType, class PayloadType, class DeletorType> | 31 template <class KeyType, class PayloadType, class DeletorType> |
| 32 class MRUCacheBase { | 32 class MRUCacheBase { |
| 33 public: | 33 public: |
| 34 // The payload of the list. This maintains a copy of the key so we can | 34 // The payload of the list. This maintains a copy of the key so we can |
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| 234 : ParentType(max_size) { | 234 : ParentType(max_size) { |
| 235 } | 235 } |
| 236 virtual ~OwningMRUCache() { | 236 virtual ~OwningMRUCache() { |
| 237 } | 237 } |
| 238 | 238 |
| 239 private: | 239 private: |
| 240 DISALLOW_COPY_AND_ASSIGN(OwningMRUCache); | 240 DISALLOW_COPY_AND_ASSIGN(OwningMRUCache); |
| 241 }; | 241 }; |
| 242 | 242 |
| 243 #endif // CHROME_COMMON_MRU_CACHE_H__ | 243 #endif // CHROME_COMMON_MRU_CACHE_H__ |
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