Move webkit/fileapi/syncable/* code to webkit/browser/fileapi (final!)

webkit/fileapi/syncable/local_file_change_tracker.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_CHANGE_TRACKER_H_
-#define WEBKIT_FILEAPI_SYNCABLE_LOCAL_FILE_CHANGE_TRACKER_H_
-
-#include <deque>
-#include <map>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/synchronization/lock.h"
-#include "webkit/browser/fileapi/file_observers.h"
-#include "webkit/browser/fileapi/file_system_url.h"
-#include "webkit/fileapi/syncable/file_change.h"
-#include "webkit/fileapi/syncable/sync_status_code.h"
-#include "webkit/storage/webkit_storage_export.h"
-
-namespace base {
-class SequencedTaskRunner;
-}
-
-namespace fileapi {
-class FileSystemContext;
-class FileSystemURL;
-}
-
-namespace sync_file_system {
-
-// Tracks local file changes for cloud-backed file systems.
-// All methods must be called on the file_task_runner given to the constructor.
-// Owned by FileSystemContext.
-class WEBKIT_STORAGE_EXPORT LocalFileChangeTracker
-    : public fileapi::FileUpdateObserver,
-      public fileapi::FileChangeObserver {
- public:
-  // |file_task_runner| must be the one where the observee file operations run.
-  // (So that we can make sure DB operations are done before actual update
-  // happens)
-  LocalFileChangeTracker(const base::FilePath& base_path,
-                         base::SequencedTaskRunner* file_task_runner);
-  virtual ~LocalFileChangeTracker();
-
-  // FileUpdateObserver overrides.
-  virtual void OnStartUpdate(const fileapi::FileSystemURL& url) OVERRIDE;
-  virtual void OnUpdate(
-      const fileapi::FileSystemURL& url, int64 delta) OVERRIDE {}
-  virtual void OnEndUpdate(const fileapi::FileSystemURL& url) OVERRIDE;
-
-  // FileChangeObserver overrides.
-  virtual void OnCreateFile(const fileapi::FileSystemURL& url) OVERRIDE;
-  virtual void OnCreateFileFrom(const fileapi::FileSystemURL& url,
-                                const fileapi::FileSystemURL& src) OVERRIDE;
-  virtual void OnRemoveFile(const fileapi::FileSystemURL& url) OVERRIDE;
-  virtual void OnModifyFile(const fileapi::FileSystemURL& url) OVERRIDE;
-  virtual void OnCreateDirectory(const fileapi::FileSystemURL& url) OVERRIDE;
-  virtual void OnRemoveDirectory(const fileapi::FileSystemURL& url) OVERRIDE;
-
-  // Retrieves an array of |url| which have more than one pending changes.
-  // If |max_urls| is non-zero (recommended in production code) this
-  // returns URLs up to the number from the ones that have smallest
-  // change_seq numbers (i.e. older changes).
-  void GetNextChangedURLs(std::deque<fileapi::FileSystemURL>* urls,
-                          int max_urls);
-
-  // Returns all changes recorded for the given |url|.
-  // This should be called after writing is disabled.
-  void GetChangesForURL(const fileapi::FileSystemURL& url,
-                        FileChangeList* changes);
-
-  // Clears the pending changes recorded in this tracker for |url|.
-  void ClearChangesForURL(const fileapi::FileSystemURL& url);
-
-  // Called by FileSyncService at the startup time to restore last dirty changes
-  // left after the last shutdown (if any).
-  SyncStatusCode Initialize(fileapi::FileSystemContext* file_system_context);
-
-  // This method is (exceptionally) thread-safe.
-  int64 num_changes() const {
-    base::AutoLock lock(num_changes_lock_);
-    return num_changes_;
-  }
-
-  void UpdateNumChanges();
-
- private:
-  class TrackerDB;
-  friend class CannedSyncableFileSystem;
-  friend class LocalFileChangeTrackerTest;
-  friend class LocalFileSyncContext;
-  friend class SyncableFileSystemTest;
-
-  struct ChangeInfo {
-    ChangeInfo();
-    ~ChangeInfo();
-    FileChangeList change_list;
-    int64 change_seq;
-  };
-
-  typedef std::map<fileapi::FileSystemURL, ChangeInfo,
-      fileapi::FileSystemURL::Comparator>
-          FileChangeMap;
-  typedef std::map<int64, fileapi::FileSystemURL> ChangeSeqMap;
-
-  // This does mostly same as calling GetNextChangedURLs with max_url=0
-  // except that it returns urls in set rather than in deque.
-  // Used only in testings.
-  void GetAllChangedURLs(fileapi::FileSystemURLSet* urls);
-
-  // Used only in testings.
-  void DropAllChanges();
-
-  // Database related methods.
-  SyncStatusCode MarkDirtyOnDatabase(const fileapi::FileSystemURL& url);
-  SyncStatusCode ClearDirtyOnDatabase(const fileapi::FileSystemURL& url);
-
-  SyncStatusCode CollectLastDirtyChanges(
-      fileapi::FileSystemContext* file_system_context);
-  void RecordChange(const fileapi::FileSystemURL& url,
-                    const FileChange& change);
-
-  bool initialized_;
-
-  scoped_refptr<base::SequencedTaskRunner> file_task_runner_;
-
-  FileChangeMap changes_;
-  ChangeSeqMap change_seqs_;
-
-  scoped_ptr<TrackerDB> tracker_db_;
-
-  // Change sequence number. Briefly gives a hint about the order of changes,
-  // but they are updated when a new change comes on the same file (as
-  // well as Drive's changestamps).
-  int64 current_change_seq_;
-
-  // This can be accessed on any threads (with num_changes_lock_).
-  int64 num_changes_;
-  mutable base::Lock num_changes_lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(LocalFileChangeTracker);
-};
-
-}  // namespace sync_file_system
-
-#endif  // WEBKIT_FILEAPI_SYNCABLE_LOCAL_FILE_CHANGE_TRACKER_H_