[fsp] Add support for aborting running operations.

chrome/browser/chromeos/file_system_provider/provided_file_system.h

 // Copyright 2014 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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_interface.h"
@@ skipping 21 matching lines @@
 
 // Provided file system implementation. Forwards requests between providers and
 // clients.
 class ProvidedFileSystem : public ProvidedFileSystemInterface {
  public:
   ProvidedFileSystem(Profile* profile,
                      const ProvidedFileSystemInfo& file_system_info);
   virtual ~ProvidedFileSystem();
 
   // ProvidedFileSystemInterface overrides.
-  virtual void RequestUnmount(
+  virtual AbortCallback RequestUnmount(
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
-  virtual void GetMetadata(const base::FilePath& entry_path,
-                           const GetMetadataCallback& callback) OVERRIDE;
-  virtual void ReadDirectory(
+  virtual AbortCallback GetMetadata(
+      const base::FilePath& entry_path,
+      const GetMetadataCallback& callback) OVERRIDE;
+  virtual AbortCallback ReadDirectory(
       const base::FilePath& directory_path,
       const fileapi::AsyncFileUtil::ReadDirectoryCallback& callback) OVERRIDE;
-  virtual void OpenFile(const base::FilePath& file_path,
-                        OpenFileMode mode,
-                        const OpenFileCallback& callback) OVERRIDE;
-  virtual void CloseFile(
+  virtual AbortCallback OpenFile(const base::FilePath& file_path,
+                                 OpenFileMode mode,
+                                 const OpenFileCallback& callback) OVERRIDE;
+  virtual AbortCallback CloseFile(
       int file_handle,
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
-  virtual void ReadFile(int file_handle,
-                        net::IOBuffer* buffer,
-                        int64 offset,
-                        int length,
-                        const ReadChunkReceivedCallback& callback) OVERRIDE;
-  virtual void CreateDirectory(
+  virtual AbortCallback ReadFile(
+      int file_handle,
+      net::IOBuffer* buffer,
+      int64 offset,
+      int length,
+      const ReadChunkReceivedCallback& callback) OVERRIDE;
+  virtual AbortCallback CreateDirectory(
       const base::FilePath& directory_path,
       bool exclusive,
       bool recursive,
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
-  virtual void DeleteEntry(
+  virtual AbortCallback DeleteEntry(
       const base::FilePath& entry_path,
       bool recursive,
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
-  virtual void CreateFile(
+  virtual AbortCallback CreateFile(
       const base::FilePath& file_path,
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
-  virtual void CopyEntry(
+  virtual AbortCallback CopyEntry(
       const base::FilePath& source_path,
       const base::FilePath& target_path,
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
-  virtual void MoveEntry(
+  virtual AbortCallback MoveEntry(
       const base::FilePath& source_path,
       const base::FilePath& target_path,
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
-  virtual void Truncate(
+  virtual AbortCallback Truncate(
       const base::FilePath& file_path,
       int64 length,
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
-  virtual void WriteFile(
+  virtual AbortCallback WriteFile(
       int file_handle,
       net::IOBuffer* buffer,
       int64 offset,
       int length,
       const fileapi::AsyncFileUtil::StatusCallback& callback) OVERRIDE;
   virtual const ProvidedFileSystemInfo& GetFileSystemInfo() const OVERRIDE;
   virtual RequestManager* GetRequestManager() OVERRIDE;
   virtual base::WeakPtr<ProvidedFileSystemInterface> GetWeakPtr() OVERRIDE;
 
  private:
+  // Aborts an operation executed with a request id equal to
+  // |operation_request_id|. The request is removed immediately on the C++ side
+  // despite being handled by the providing extension or not.
+  void Abort(int operation_request_id,
+             const fileapi::AsyncFileUtil::StatusCallback& callback);
+
   Profile* profile_;                       // Not owned.
   extensions::EventRouter* event_router_;  // Not owned. May be NULL.
   ProvidedFileSystemInfo file_system_info_;
   scoped_ptr<NotificationManagerInterface> notification_manager_;
   RequestManager request_manager_;
 
-  base::WeakPtrFactory<ProvidedFileSystemInterface> weak_ptr_factory_;
+  base::WeakPtrFactory<ProvidedFileSystem> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(ProvidedFileSystem);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_PROVIDED_FILE_SYSTEM_H_