Add LocalFileSyncContext class which wires up profile-owned service and FileSystemContext(s)

webkit/fileapi/syncable/local_file_sync_context.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 WEBKIT_FILEAPI_SYNCABLE_LOCAL_FILE_SYNC_CONTEXT_H_
+#define WEBKIT_FILEAPI_SYNCABLE_LOCAL_FILE_SYNC_CONTEXT_H_
+
+#include <deque>
+#include <map>
+#include <set>
+
+#include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "base/file_path.h"
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "googleurl/src/gurl.h"
+#include "webkit/fileapi/fileapi_export.h"
+#include "webkit/fileapi/syncable/file_change.h"
+#include "webkit/fileapi/syncable/sync_status_code.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace fileapi {
+
+class FileSystemContext;
+class LocalFileChangeTracker;
+
+// This class works as a bridge between LocalFileSyncService (which is a
+// per-profile object) and FileSystemContext's (which is a per-storage-partition
+// object and may exist multiple in a profile).
+// An instance of this class is shared by FileSystemContexts and outlives
+// LocalFileSyncService.
+class FILEAPI_EXPORT LocalFileSyncContext
+    : public base::RefCountedThreadSafe<LocalFileSyncContext> {
+ public:
+  typedef base::Callback<void(SyncStatusCode status)> StatusCallback;
+
+  LocalFileSyncContext(base::SingleThreadTaskRunner* ui_task_runner,
+                       base::SingleThreadTaskRunner* io_task_runner);
+
+  // Initializes |file_system_context| for syncable file operations and
+  // registers the it into the internal map.
+  // Calling this multiple times for the same file_system_context is valid.
+  // This method must be called on UI thread.
+  void MaybeInitializeFileSystemContext(const GURL& source_url,
+                                        FileSystemContext* file_system_context,
+                                        const StatusCallback& callback);
+
+  // Called when the corresponding LocalFileSyncService exits.
+  // This method must be called on UI thread.
+  void ShutdownOnUIThread();
+
+ private:
+  typedef std::deque<StatusCallback> StatusCallbackQueue;
+  friend class base::RefCountedThreadSafe<LocalFileSyncContext>;
+
+  ~LocalFileSyncContext();
+
+  void ShutdownOnIOThread();
+
+  // Helper routines for MaybeInitializeFileSystemContext.
+  void InitializeFileSystemContextOnIOThread(
+      const GURL& source_url,
+      FileSystemContext* file_system_context);
+  SyncStatusCode InitializeChangeTrackerOnFileThread(
+      scoped_ptr<LocalFileChangeTracker>* tracker_ptr,
+      FileSystemContext* file_system_context);
+  void DidInitializeChangeTracker(
+      scoped_ptr<LocalFileChangeTracker>* tracker_ptr,
+      const GURL& source_url,
+      FileSystemContext* file_system_context,
+      SyncStatusCode status);
+  void DidInitialize(
+      const GURL& source_url,
+      FileSystemContext* file_system_context,
+      SyncStatusCode status);
+
+  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
+
+  // This must be accessed only on UI thread.
+  bool shutdown_;
+
+  // Pointers to file system contexts that have been initialized for
+  // synchronization (i.e. that own this instance).
+  // This must be accessed only on UI thread.
+  std::set<FileSystemContext*> file_system_contexts_;
+
+  std::map<FileSystemContext*, StatusCallbackQueue>
+      pending_initialize_callbacks_;
+
+  // Origin to context map. (Assuming that as far as we're in the same
+  // profile single origin wouldn't belong to multiple FileSystemContexts.)
+  std::map<GURL, FileSystemContext*> origin_to_contexts_;
+
+  DISALLOW_COPY_AND_ASSIGN(LocalFileSyncContext);
+};
+
+}  // namespace fileapi
+
+#endif  // WEBKIT_FILEAPI_SYNCABLE_LOCAL_FILE_SYNC_CONTEXT_H_