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1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. | 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 | 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 // See net/disk_cache/disk_cache.h for the public interface of the cache. | 5 // See net/disk_cache/disk_cache.h for the public interface of the cache. |
6 | 6 |
7 #ifndef NET_DISK_CACHE_MEM_BACKEND_IMPL_H__ | 7 #ifndef NET_DISK_CACHE_MEM_BACKEND_IMPL_H__ |
8 #define NET_DISK_CACHE_MEM_BACKEND_IMPL_H__ | 8 #define NET_DISK_CACHE_MEM_BACKEND_IMPL_H__ |
9 | 9 |
10 #include "base/hash_tables.h" | 10 #include "base/hash_tables.h" |
11 | 11 |
12 #include "net/disk_cache/disk_cache.h" | 12 #include "net/disk_cache/disk_cache.h" |
13 #include "net/disk_cache/mem_rankings.h" | 13 #include "net/disk_cache/mem_rankings.h" |
14 | 14 |
15 namespace disk_cache { | 15 namespace disk_cache { |
16 | 16 |
17 class MemEntryImpl; | 17 class MemEntryImpl; |
18 | 18 |
19 // This class implements the Backend interface. An object of this class handles | 19 // This class implements the Backend interface. An object of this class handles |
20 // the operations of the cache without writing to disk. | 20 // the operations of the cache without writing to disk. |
21 class MemBackendImpl : public Backend { | 21 class MemBackendImpl : public Backend { |
22 public: | 22 public: |
23 MemBackendImpl() : max_size_(0), current_size_(0) {} | 23 MemBackendImpl() : max_size_(0), current_size_(0) {} |
24 ~MemBackendImpl(); | 24 ~MemBackendImpl(); |
25 | 25 |
| 26 // Returns an instance of a Backend implemented only in memory. The returned |
| 27 // object should be deleted when not needed anymore. max_bytes is the maximum |
| 28 // size the cache can grow to. If zero is passed in as max_bytes, the cache |
| 29 // will determine the value to use based on the available memory. The returned |
| 30 // pointer can be NULL if a fatal error is found. |
| 31 static Backend* CreateBackend(int max_bytes); |
| 32 |
26 // Performs general initialization for this current instance of the cache. | 33 // Performs general initialization for this current instance of the cache. |
27 bool Init(); | 34 bool Init(); |
28 | 35 |
29 // Backend interface. | 36 // Backend interface. |
30 virtual int32 GetEntryCount() const; | 37 virtual int32 GetEntryCount() const; |
31 virtual bool OpenEntry(const std::string& key, Entry** entry); | 38 virtual bool OpenEntry(const std::string& key, Entry** entry); |
32 virtual int OpenEntry(const std::string& key, Entry** entry, | 39 virtual int OpenEntry(const std::string& key, Entry** entry, |
33 CompletionCallback* callback); | 40 CompletionCallback* callback); |
34 virtual bool CreateEntry(const std::string& key, Entry** entry); | 41 virtual bool CreateEntry(const std::string& key, Entry** entry); |
35 virtual int CreateEntry(const std::string& key, Entry** entry, | 42 virtual int CreateEntry(const std::string& key, Entry** entry, |
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93 MemRankings rankings_; // Rankings to be able to trim the cache. | 100 MemRankings rankings_; // Rankings to be able to trim the cache. |
94 int32 max_size_; // Maximum data size for this instance. | 101 int32 max_size_; // Maximum data size for this instance. |
95 int32 current_size_; | 102 int32 current_size_; |
96 | 103 |
97 DISALLOW_COPY_AND_ASSIGN(MemBackendImpl); | 104 DISALLOW_COPY_AND_ASSIGN(MemBackendImpl); |
98 }; | 105 }; |
99 | 106 |
100 } // namespace disk_cache | 107 } // namespace disk_cache |
101 | 108 |
102 #endif // NET_DISK_CACHE_MEM_BACKEND_IMPL_H__ | 109 #endif // NET_DISK_CACHE_MEM_BACKEND_IMPL_H__ |
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