SyncFS: Introduce SyncFileSystemBackend

webkit/browser/fileapi/syncable/sync_file_system_backend.h

+// Copyright 2013 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 WEBKIT_BROWSER_FILEAPI_SYNCABLE_SYNC_FILE_SYSTEM_BACKEND_H_
+#define WEBKIT_BROWSER_FILEAPI_SYNCABLE_SYNC_FILE_SYSTEM_BACKEND_H_
+
+#include "webkit/browser/fileapi/sandbox_file_system_backend.h"
+#include "webkit/browser/fileapi/syncable/local_file_change_tracker.h"
+#include "webkit/browser/fileapi/syncable/local_file_sync_context.h"
+
+namespace sync_file_system {
+
+class WEBKIT_STORAGE_BROWSER_EXPORT SyncFileSystemBackend
+    : public fileapi::SandboxFileSystemBackend {
+ public:
+  SyncFileSystemBackend(
+      base::SequencedTaskRunner* file_task_runner,
+      const fileapi::FileSystemOptions& file_system_options);
+  virtual ~SyncFileSystemBackend();
+
+  // FileSystemBackend overrides.
+  virtual bool CanHandleType(fileapi::FileSystemType type) const OVERRIDE;
+  virtual void InitializeFileSystem(
+      const GURL& origin_url,
+      fileapi::FileSystemType type,
+      fileapi::OpenFileSystemMode mode,
+      fileapi::FileSystemContext* context,
+      const InitializeFileSystemCallback& callback) OVERRIDE;
+  virtual fileapi::FileSystemFileUtil* GetFileUtil(
+      fileapi::FileSystemType type,
+      const fileapi::FileSystemContext* context) OVERRIDE;
+  virtual fileapi::AsyncFileUtil* GetAsyncFileUtil(
+      fileapi::FileSystemType type,
+      const fileapi::FileSystemContext* context) OVERRIDE;
+  virtual fileapi::FileSystemOperation* CreateFileSystemOperation(
+      const fileapi::FileSystemURL& url,
+      fileapi::FileSystemContext* context,
+      base::PlatformFileError* error_code) const OVERRIDE;
+
+  // FileSystemQuotaUtil overrides.
+  virtual void GetOriginsForTypeOnFileThread(
+      fileapi::FileSystemType type,
+      std::set<GURL>* origins) OVERRIDE;
+  virtual void AddFileUpdateObserver(
+      fileapi::FileSystemType type,
+      fileapi::FileUpdateObserver* observer,
+      base::SequencedTaskRunner* task_runner) OVERRIDE;
+  virtual void AddFileChangeObserver(
+      fileapi::FileSystemType type,
+      fileapi::FileChangeObserver* observer,
+      base::SequencedTaskRunner* task_runner) OVERRIDE;
+  virtual const fileapi::UpdateObserverList* GetUpdateObservers(
+      fileapi::FileSystemType type) const OVERRIDE;
+  virtual const fileapi::ChangeObserverList* GetChangeObservers(
+      fileapi::FileSystemType type) const OVERRIDE;
+
+  static SyncFileSystemBackend* GetBackend(
+      const fileapi::FileSystemContext* file_system_context);
+
+  LocalFileChangeTracker* change_tracker() { return change_tracker_.get(); }
+  void set_change_tracker(scoped_ptr<LocalFileChangeTracker> tracker);
+
+  LocalFileSyncContext* sync_context() { return sync_context_.get(); }
+  void set_sync_context(sync_file_system::LocalFileSyncContext* sync_context);
+
+ private:
+  friend class CannedSyncableFileSystem;
+
+  // This initialization method is lazily called the first time
+  // FileSystemContext is given.
+  void LazyInitialize(fileapi::SandboxContext* sandbox_context_);
+
+  fileapi::UpdateObserverList syncable_update_observers_;
+  fileapi::ChangeObserverList syncable_change_observers_;
+
+  scoped_ptr<LocalFileChangeTracker> change_tracker_;
+  scoped_refptr<sync_file_system::LocalFileSyncContext> sync_context_;
+
+  DISALLOW_COPY_AND_ASSIGN(SyncFileSystemBackend);
+};
+
+}  // namespace sync_file_system
+
+#endif  // WEBKIT_BROWSER_FILEAPI_SYNCABLE_SYNC_FILE_SYSTEM_BACKEND_H_