diff options
Diffstat (limited to 'chromium/net/disk_cache/block_files.h')
-rw-r--r-- | chromium/net/disk_cache/block_files.h | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/chromium/net/disk_cache/block_files.h b/chromium/net/disk_cache/block_files.h deleted file mode 100644 index f8d5483a0b3..00000000000 --- a/chromium/net/disk_cache/block_files.h +++ /dev/null @@ -1,169 +0,0 @@ -// Copyright (c) 2012 The Chromium Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. - -// See net/disk_cache/disk_cache.h for the public interface. - -#ifndef NET_DISK_CACHE_BLOCK_FILES_H_ -#define NET_DISK_CACHE_BLOCK_FILES_H_ - -#include <vector> - -#include "base/files/file_path.h" -#include "base/gtest_prod_util.h" -#include "base/memory/scoped_ptr.h" -#include "net/base/net_export.h" -#include "net/disk_cache/addr.h" -#include "net/disk_cache/disk_format_base.h" -#include "net/disk_cache/mapped_file.h" - -namespace base { -class ThreadChecker; -} - -namespace disk_cache { - -// An instance of this class represents the header of a block file in memory. -// Note that this class doesn't perform any file operation (as in it only deals -// with entities in memory). -// The header of a block file (and hence, this object) is all that is needed to -// perform common operations like allocating or releasing space for storage; -// actual access to that storage, however, is not performed through this class. -class NET_EXPORT_PRIVATE BlockHeader { - public: - BlockHeader(); - explicit BlockHeader(BlockFileHeader* header); - explicit BlockHeader(MappedFile* file); - BlockHeader(const BlockHeader& other); - ~BlockHeader(); - - // Creates a new entry of |size| blocks on the allocation map, updating the - // apropriate counters. - bool CreateMapBlock(int size, int* index); - - // Deletes the block pointed by |index|. - void DeleteMapBlock(int index, int block_size); - - // Returns true if the specified block is used. - bool UsedMapBlock(int index, int size); - - // Restores the "empty counters" and allocation hints. - void FixAllocationCounters(); - - // Returns true if the current block file should not be used as-is to store - // more records. |block_count| is the number of blocks to allocate. - bool NeedToGrowBlockFile(int block_count) const; - - // Returns true if this block file can be used to store an extra record of - // size |block_count|. - bool CanAllocate(int block_count) const; - - // Returns the number of empty blocks for this file. - int EmptyBlocks() const; - - // Returns the minumum number of allocations that can be satisfied. - int MinimumAllocations() const; - - // Returns the number of blocks that this file can store. - int Capacity() const; - - // Returns true if the counters look OK. - bool ValidateCounters() const; - - // Returns the identifiers of this and the next file (0 if there is none). - int FileId() const; - int NextFileId() const; - - // Returns the size of the wrapped structure (BlockFileHeader). - int Size() const; - - // Returns a pointer to the underlying BlockFileHeader. - // TODO(rvargas): This may be removed with the support for V2. - BlockFileHeader* Header(); - - private: - BlockFileHeader* header_; -}; - -typedef std::vector<BlockHeader> BlockFilesBitmaps; - -// This class handles the set of block-files open by the disk cache. -class NET_EXPORT_PRIVATE BlockFiles { - public: - explicit BlockFiles(const base::FilePath& path); - ~BlockFiles(); - - // Performs the object initialization. create_files indicates if the backing - // files should be created or just open. - bool Init(bool create_files); - - // Returns the file that stores a given address. - MappedFile* GetFile(Addr address); - - // Creates a new entry on a block file. block_type indicates the size of block - // to be used (as defined on cache_addr.h), block_count is the number of - // blocks to allocate, and block_address is the address of the new entry. - bool CreateBlock(FileType block_type, int block_count, Addr* block_address); - - // Removes an entry from the block files. If deep is true, the storage is zero - // filled; otherwise the entry is removed but the data is not altered (must be - // already zeroed). - void DeleteBlock(Addr address, bool deep); - - // Close all the files and set the internal state to be initializad again. The - // cache is being purged. - void CloseFiles(); - - // Sends UMA stats. - void ReportStats(); - - // Returns true if the blocks pointed by a given address are currently used. - // This method is only intended for debugging. - bool IsValid(Addr address); - - private: - // Set force to true to overwrite the file if it exists. - bool CreateBlockFile(int index, FileType file_type, bool force); - bool OpenBlockFile(int index); - - // Attemp to grow this file. Fails if the file cannot be extended anymore. - bool GrowBlockFile(MappedFile* file, BlockFileHeader* header); - - // Returns the appropriate file to use for a new block. - MappedFile* FileForNewBlock(FileType block_type, int block_count); - - // Returns the next block file on this chain, creating new files if needed. - MappedFile* NextFile(MappedFile* file); - - // Creates an empty block file and returns its index. - int CreateNextBlockFile(FileType block_type); - - // Removes a chained block file that is now empty. - bool RemoveEmptyFile(FileType block_type); - - // Restores the header of a potentially inconsistent file. - bool FixBlockFileHeader(MappedFile* file); - - // Retrieves stats for the given file index. - void GetFileStats(int index, int* used_count, int* load); - - // Returns the filename for a given file index. - base::FilePath Name(int index); - - bool init_; - char* zero_buffer_; // Buffer to speed-up cleaning deleted entries. - base::FilePath path_; // Path to the backing folder. - std::vector<MappedFile*> block_files_; // The actual files. - scoped_ptr<base::ThreadChecker> thread_checker_; - - FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_ZeroSizeFile); - FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_TruncatedFile); - FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_InvalidFile); - FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_Stats); - - DISALLOW_COPY_AND_ASSIGN(BlockFiles); -}; - -} // namespace disk_cache - -#endif // NET_DISK_CACHE_BLOCK_FILES_H_ |