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82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// See net/disk_cache/disk_cache.h for the public interface of the cache.
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#ifndef NET_DISK_CACHE_BLOCKFILE_MAPPED_FILE_H_
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#define NET_DISK_CACHE_BLOCKFILE_MAPPED_FILE_H_
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#include <stddef.h>
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#include "base/macros.h"
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#include "net/base/net_export.h"
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#include "net/disk_cache/blockfile/file.h"
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#include "net/disk_cache/blockfile/file_block.h"
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#include "net/net_features.h"
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namespace base {
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class FilePath;
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}
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namespace disk_cache {
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// This class implements a memory mapped file used to access block-files. The
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// idea is that the header and bitmap will be memory mapped all the time, and
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// the actual data for the blocks will be access asynchronously (most of the
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// time).
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class NET_EXPORT_PRIVATE MappedFile : public File {
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public:
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MappedFile() : File(true), init_(false) {}
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// Performs object initialization. name is the file to use, and size is the
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// amount of data to memory map from the file. If size is 0, the whole file
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// will be mapped in memory.
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void* Init(const base::FilePath& name, size_t size);
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void* buffer() const {
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return buffer_;
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}
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// Loads or stores a given block from the backing file (synchronously).
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bool Load(const FileBlock* block);
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bool Store(const FileBlock* block);
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// Flush the memory-mapped section to disk (synchronously).
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void Flush();
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// Heats up the file system cache and make sure the file is fully
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// readable (synchronously).
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bool Preload();
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private:
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~MappedFile() override;
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bool init_;
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#if defined(OS_WIN)
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HANDLE section_;
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#endif
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void* buffer_; // Address of the memory mapped buffer.
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size_t view_size_; // Size of the memory pointed by buffer_.
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#if BUILDFLAG(POSIX_AVOID_MMAP)
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void* snapshot_; // Copy of the buffer taken when it was last flushed.
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#endif
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DISALLOW_COPY_AND_ASSIGN(MappedFile);
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};
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// Helper class for calling Flush() on exit from the current scope.
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class ScopedFlush {
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public:
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explicit ScopedFlush(MappedFile* file) : file_(file) {}
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~ScopedFlush() {
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file_->Flush();
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}
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private:
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MappedFile* file_;
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};
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} // namespace disk_cache
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#endif // NET_DISK_CACHE_BLOCKFILE_MAPPED_FILE_H_
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