net: Implement canceling of all async operations in FileStream.

net/base/file_stream_win.h

-// 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.
-
-// This file implements FileStream for Windows.
-
-#ifndef NET_BASE_FILE_STREAM_WIN_H_
-#define NET_BASE_FILE_STREAM_WIN_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "base/platform_file.h"
-#include "base/synchronization/waitable_event.h"
-#include "net/base/completion_callback.h"
-#include "net/base/file_stream_whence.h"
-#include "net/base/net_export.h"
-#include "net/base/net_log.h"
-
-class FilePath;
-
-namespace base {
-class WaitableEvent;
-}
-
-namespace net {
-
-class IOBuffer;
-
-class NET_EXPORT FileStreamWin {
- public:
-  explicit FileStreamWin(net::NetLog* net_log);
-  FileStreamWin(base::PlatformFile file, int flags, net::NetLog* net_log);
-  ~FileStreamWin();
-
-  // FileStream implementations.
-  void Close(const CompletionCallback& callback);
-  void CloseSync();
-  int Open(const FilePath& path, int open_flags,
-           const CompletionCallback& callback);
-  int OpenSync(const FilePath& path, int open_flags);
-  bool IsOpen() const;
-  int Seek(Whence whence, int64 offset,
-           const Int64CompletionCallback& callback);
-  int64 SeekSync(Whence whence, int64 offset);
-  int64 Available();
-  int Read(IOBuffer* buf, int buf_len, const CompletionCallback& callback);
-  int ReadSync(char* buf, int buf_len);
-  int ReadUntilComplete(char *buf, int buf_len);
-  int Write(IOBuffer* buf, int buf_len, const CompletionCallback& callback);
-  int WriteSync(const char* buf, int buf_len);
-  int64 Truncate(int64 bytes);
-  int Flush();
-  void EnableErrorStatistics();
-  void SetBoundNetLogSource(const net::BoundNetLog& owner_bound_net_log);
-  base::PlatformFile GetPlatformFileForTesting();
-
- private:
-  class AsyncContext;
-
-  // A helper method for Seek.
-  void SeekFile(Whence whence, int64 offset, int64* result);
-
-  // Called when the file_ is opened asynchronously. |result| contains the
-  // result as a network error code.
-  void OnOpened(const CompletionCallback& callback, int* result);
-
-  // Called when the file_ is closed asynchronously.
-  void OnClosed(const CompletionCallback& callback);
-
-  // Called when the file_ is seeked asynchronously.
-  void OnSeeked(const Int64CompletionCallback& callback, int64* result);
-
-  // Resets on_io_complete_ and WeakPtr's.
-  // Called in OnOpened, OnClosed and OnSeeked.
-  void ResetOnIOComplete();
-
-  // Waits until the in-flight async open/close operation is complete.
-  void WaitForIOCompletion();
-
-  // This member is used to support asynchronous reads.  It is non-null when
-  // the FileStreamWin was opened with PLATFORM_FILE_ASYNC.
-  scoped_ptr<AsyncContext> async_context_;
-
-  base::PlatformFile file_;
-  int open_flags_;
-  bool auto_closed_;
-  bool record_uma_;
-  net::BoundNetLog bound_net_log_;
-  base::WeakPtrFactory<FileStreamWin> weak_ptr_factory_;
-  scoped_ptr<base::WaitableEvent> on_io_complete_;
-
-  DISALLOW_COPY_AND_ASSIGN(FileStreamWin);
-};
-
-}  // namespace net
-
-#endif  // NET_BASE_FILE_STREAM_WIN_H_