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- // 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 BUTIL_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
- #define BUTIL_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
- #include <CoreServices/CoreServices.h>
- #include <vector>
- #include "butil/files/file_path.h"
- #include "butil/files/file_path_watcher.h"
- namespace butil {
- // Mac-specific file watcher implementation based on FSEvents.
- // There are trade-offs between the FSEvents implementation and a kqueue
- // implementation. The biggest issues are that FSEvents on 10.6 sometimes drops
- // events and kqueue does not trigger for modifications to a file in a watched
- // directory. See file_path_watcher_mac.cc for the code that decides when to
- // use which one.
- class FilePathWatcherFSEvents : public FilePathWatcher::PlatformDelegate {
- public:
- FilePathWatcherFSEvents();
- // Called from the FSEvents callback whenever there is a change to the paths.
- void OnFilePathsChanged(const std::vector<FilePath>& paths);
- // (Re-)Initialize the event stream to start reporting events from
- // |start_event|.
- void UpdateEventStream(FSEventStreamEventId start_event);
- // Returns true if resolving the target path got a different result than
- // last time it was done.
- bool ResolveTargetPath();
- // FilePathWatcher::PlatformDelegate overrides.
- virtual bool Watch(const FilePath& path,
- bool recursive,
- const FilePathWatcher::Callback& callback) OVERRIDE;
- virtual void Cancel() OVERRIDE;
- private:
- virtual ~FilePathWatcherFSEvents();
- // Destroy the event stream.
- void DestroyEventStream();
- // Start watching the FSEventStream.
- void StartEventStream(FSEventStreamEventId start_event);
- // Cleans up and stops the event stream.
- virtual void CancelOnMessageLoopThread() OVERRIDE;
- // Callback to notify upon changes.
- FilePathWatcher::Callback callback_;
- // Target path to watch (passed to callback).
- FilePath target_;
- // Target path with all symbolic links resolved.
- FilePath resolved_target_;
- // Backend stream we receive event callbacks from (strong reference).
- FSEventStreamRef fsevent_stream_;
- DISALLOW_COPY_AND_ASSIGN(FilePathWatcherFSEvents);
- };
- } // namespace butil
- #endif // BUTIL_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
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