Convert MessageLoopProxy to TaskRunner in FileUtilProxy

base/file_util_proxy.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.
 
 #ifndef BASE_FILE_UTIL_PROXY_H_
 #define BASE_FILE_UTIL_PROXY_H_
 
 #include <vector>
 
 #include "base/base_export.h"
 #include "base/callback.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/platform_file.h"
 #include "base/tracked_objects.h"
 
 namespace base {
 
-class MessageLoopProxy;
+class TaskRunner;
 class Time;
 
 // This class provides asynchronous access to common file routines.
 class BASE_EXPORT FileUtilProxy {
  public:
   // Holds metadata for file or directory entry.
   struct Entry {
     FilePath::StringType name;
     bool is_directory;
     int64 size;
@@ skipping 21 matching lines @@
                         int /* bytes written */)> WriteCallback;
 
   typedef Callback<PlatformFileError(PlatformFile*, bool*)> CreateOrOpenTask;
   typedef Callback<PlatformFileError(PlatformFile)> CloseTask;
   typedef Callback<PlatformFileError(void)> FileTask;
 
   // Creates or opens a file with the given flags. It is invalid to pass a null
   // callback. If PLATFORM_FILE_CREATE is set in |file_flags| it always tries to
   // create a new file at the given |file_path| and calls back with
   // PLATFORM_FILE_ERROR_FILE_EXISTS if the |file_path| already exists.
-  static bool CreateOrOpen(scoped_refptr<MessageLoopProxy> message_loop_proxy,
+  static bool CreateOrOpen(TaskRunner* task_runner,
                            const FilePath& file_path,
                            int file_flags,
                            const CreateOrOpenCallback& callback);
 
   // Creates a temporary file for writing. The path and an open file handle are
   // returned. It is invalid to pass a null callback. The additional file flags
   // will be added on top of the default file flags which are:
   //   base::PLATFORM_FILE_CREATE_ALWAYS
   //   base::PLATFORM_FILE_WRITE
   //   base::PLATFORM_FILE_TEMPORARY.
   // Set |additional_file_flags| to 0 for synchronous writes and set to
   // base::PLATFORM_FILE_ASYNC to support asynchronous file operations.
   static bool CreateTemporary(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       int additional_file_flags,
       const CreateTemporaryCallback& callback);
 
   // Close the given file handle.
-  static bool Close(scoped_refptr<MessageLoopProxy> message_loop_proxy,
+  static bool Close(TaskRunner* task_runner,
                     PlatformFile,
                     const StatusCallback& callback);
 
   // Retrieves the information about a file. It is invalid to pass a null
   // callback.
   static bool GetFileInfo(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       const FilePath& file_path,
       const GetFileInfoCallback& callback);
 
   static bool GetFileInfoFromPlatformFile(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       PlatformFile file,
       const GetFileInfoCallback& callback);
 
   // Deletes a file or a directory.
   // It is an error to delete a non-empty directory with recursive=false.
-  static bool Delete(scoped_refptr<MessageLoopProxy> message_loop_proxy,
+  static bool Delete(TaskRunner* task_runner,
                      const FilePath& file_path,
                      bool recursive,
                      const StatusCallback& callback);
 
   // Deletes a directory and all of its contents.
   static bool RecursiveDelete(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       const FilePath& file_path,
       const StatusCallback& callback);
 
   // Reads from a file. On success, the file pointer is moved to position
   // |offset + bytes_to_read| in the file. The callback can be null.
   static bool Read(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       PlatformFile file,
       int64 offset,
       int bytes_to_read,
       const ReadCallback& callback);
 
   // Writes to a file. If |offset| is greater than the length of the file,
   // |false| is returned. On success, the file pointer is moved to position
   // |offset + bytes_to_write| in the file. The callback can be null.
   // |bytes_to_write| must be greater than zero.
   static bool Write(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       PlatformFile file,
       int64 offset,
       const char* buffer,
       int bytes_to_write,
       const WriteCallback& callback);
 
   // Touches a file. The callback can be null.
   static bool Touch(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       PlatformFile file,
       const Time& last_access_time,
       const Time& last_modified_time,
       const StatusCallback& callback);
 
   // Touches a file. The callback can be null.
   static bool Touch(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       const FilePath& file_path,
       const Time& last_access_time,
       const Time& last_modified_time,
       const StatusCallback& callback);
 
   // Truncates a file to the given length. If |length| is greater than the
   // current length of the file, the file will be extended with zeroes.
   // The callback can be null.
   static bool Truncate(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       PlatformFile file,
       int64 length,
       const StatusCallback& callback);
 
   // Truncates a file to the given length. If |length| is greater than the
   // current length of the file, the file will be extended with zeroes.
   // The callback can be null.
   static bool Truncate(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       const FilePath& path,
       int64 length,
       const StatusCallback& callback);
 
   // Flushes a file. The callback can be null.
   static bool Flush(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       PlatformFile file,
       const StatusCallback& callback);
 
   // Relay helpers.
   static bool RelayFileTask(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       const tracked_objects::Location& from_here,
       const FileTask& task,
       const StatusCallback& callback);
 
   static bool RelayCreateOrOpen(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       const CreateOrOpenTask& open_task,
       const CloseTask& close_task,
       const CreateOrOpenCallback& callback);
 
   static bool RelayClose(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
+      TaskRunner* task_runner,
       const CloseTask& close_task,
       PlatformFile,
       const StatusCallback& callback);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileUtilProxy);
 };
 
 }  // namespace base
 
 #endif  // BASE_FILE_UTIL_PROXY_H_