1 // Copyright (c) 2012 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 of the cache. 6 7 #ifndef NET_DISK_CACHE_BACKEND_IMPL_H_ 8 #define NET_DISK_CACHE_BACKEND_IMPL_H_ 9 10 #include "base/containers/hash_tables.h" 11 #include "base/files/file_path.h" 12 #include "base/timer/timer.h" 13 #include "net/disk_cache/block_files.h" 14 #include "net/disk_cache/disk_cache.h" 15 #include "net/disk_cache/eviction.h" 16 #include "net/disk_cache/in_flight_backend_io.h" 17 #include "net/disk_cache/rankings.h" 18 #include "net/disk_cache/stats.h" 19 #include "net/disk_cache/stress_support.h" 20 #include "net/disk_cache/trace.h" 21 22 namespace disk_cache { 23 24 // This class implements the Backend interface. An object of this 25 // class handles the operations of the cache for a particular profile. 26 class NET_EXPORT_PRIVATE BackendImpl : public Backend { 27 friend class Eviction; 28 public: 29 BackendImpl(const base::FilePath& path, base::MessageLoopProxy* cache_thread, 30 net::NetLog* net_log); 31 32 // Performs general initialization for this current instance of the cache. 33 int Init(const CompletionCallback& callback); 34 35 private: 36 void CleanupCache(); 37 38 // Returns the full name for an external storage file. 39 base::FilePath GetFileName(Addr address) const; 40 41 // Creates a new backing file for the cache index. 42 bool CreateBackingStore(disk_cache::File* file); 43 bool InitBackingStore(bool* file_created); 44 45 // Reports an uncommon, recoverable error. 46 void ReportError(int error); 47 48 // Performs basic checks on the index file. Returns false on failure. 49 bool CheckIndex(); 50 51 base::FilePath path_; // Path to the folder used as backing storage. 52 BlockFiles block_files_; // Set of files used to store all data. 53 bool init_; // controls the initialization of the system. 54 55 DISALLOW_COPY_AND_ASSIGN(BackendImpl); 56 }; 57 58 } // namespace disk_cache 59 60 #endif // NET_DISK_CACHE_BACKEND_IMPL_H_ 61