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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 BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
#define BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
#include <CoreServices/CoreServices.h>
#include <vector>
#include "base/files/file_path.h"
#include "base/files/file_path_watcher.h"
namespace base {
// 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 base
#endif // BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
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