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104 lines
3.3 KiB
C++
104 lines
3.3 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_FILE_H_
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#define NET_DISK_CACHE_BLOCKFILE_FILE_H_
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#include <stddef.h>
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#include "base/files/file.h"
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#include "base/macros.h"
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#include "base/memory/ref_counted.h"
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#include "net/base/net_export.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 interface is used to support asynchronous ReadData and WriteData calls.
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class FileIOCallback {
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public:
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// Notified of the actual number of bytes read or written. This value is
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// negative if an error occurred.
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virtual void OnFileIOComplete(int bytes_copied) = 0;
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protected:
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virtual ~FileIOCallback() {}
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};
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// Simple wrapper around a file that allows asynchronous operations.
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class NET_EXPORT_PRIVATE File : public base::RefCounted<File> {
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friend class base::RefCounted<File>;
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public:
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File();
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// mixed_mode set to true enables regular synchronous operations for the file.
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explicit File(bool mixed_mode);
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// Initializes the object to use the passed in file instead of opening it with
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// the Init() call. No asynchronous operations can be performed with this
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// object.
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explicit File(base::File file);
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// Initializes the object to point to a given file. The file must aready exist
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// on disk, and allow shared read and write.
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bool Init(const base::FilePath& name);
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// Returns true if the file was opened properly.
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bool IsValid() const;
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// Performs synchronous IO.
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bool Read(void* buffer, size_t buffer_len, size_t offset);
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bool Write(const void* buffer, size_t buffer_len, size_t offset);
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// Performs asynchronous IO. callback will be called when the IO completes,
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// as an APC on the thread that queued the operation.
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bool Read(void* buffer, size_t buffer_len, size_t offset,
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FileIOCallback* callback, bool* completed);
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bool Write(const void* buffer, size_t buffer_len, size_t offset,
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FileIOCallback* callback, bool* completed);
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// Sets the file's length. The file is truncated or extended with zeros to
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// the new length.
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bool SetLength(size_t length);
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size_t GetLength();
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// Blocks until |num_pending_io| IO operations complete.
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static void WaitForPendingIO(int* num_pending_io);
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// Drops current pending operations without waiting for them to complete.
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static void DropPendingIO();
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protected:
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virtual ~File();
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// Returns the handle or file descriptor.
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base::PlatformFile platform_file() const;
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private:
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// Performs the actual asynchronous write. If notify is set and there is no
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// callback, the call will be re-synchronized.
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bool AsyncWrite(const void* buffer, size_t buffer_len, size_t offset,
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FileIOCallback* callback, bool* completed);
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// Infrastructure for async IO.
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int DoRead(void* buffer, size_t buffer_len, size_t offset);
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int DoWrite(const void* buffer, size_t buffer_len, size_t offset);
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void OnOperationComplete(FileIOCallback* callback, int result);
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bool init_;
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bool mixed_;
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base::File base_file_; // Regular, asynchronous IO handle.
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base::File sync_base_file_; // Synchronous IO handle.
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DISALLOW_COPY_AND_ASSIGN(File);
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};
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} // namespace disk_cache
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#endif // NET_DISK_CACHE_BLOCKFILE_FILE_H_
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