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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_ | |
| 6 #define BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_ | |
| 7 | |
| 8 #include <CoreServices/CoreServices.h> | |
| 9 | |
| 10 #include <vector> | |
| 11 | |
| 12 #include "base/files/file_path.h" | |
| 13 #include "base/files/file_path_watcher.h" | |
| 14 | |
| 15 namespace base { | |
| 16 | |
| 17 // Mac-specific file watcher implementation based on FSEvents. | |
| 18 // There are trade-offs between the FSEvents implementation and a kqueue | |
| 19 // implementation. The biggest issues are that FSEvents on 10.6 sometimes drops | |
| 20 // events and kqueue does not trigger for modifications to a file in a watched | |
| 21 // directory. See file_path_watcher_mac.cc for the code that decides when to | |
| 22 // use which one. | |
| 23 class FilePathWatcherFSEvents : public FilePathWatcher::PlatformDelegate { | |
| 24 public: | |
| 25 FilePathWatcherFSEvents(); | |
| 26 | |
| 27 // FilePathWatcher::PlatformDelegate overrides. | |
| 28 bool Watch(const FilePath& path, | |
| 29 bool recursive, | |
| 30 const FilePathWatcher::Callback& callback) override; | |
| 31 void Cancel() override; | |
| 32 | |
| 33 private: | |
| 34 static void FSEventsCallback(ConstFSEventStreamRef stream, | |
| 35 void* event_watcher, | |
| 36 size_t num_events, | |
| 37 void* event_paths, | |
| 38 const FSEventStreamEventFlags flags[], | |
| 39 const FSEventStreamEventId event_ids[]); | |
| 40 | |
| 41 ~FilePathWatcherFSEvents() override; | |
| 42 | |
| 43 // Called from FSEventsCallback whenever there is a change to the paths. | |
| 44 void OnFilePathsChanged(const std::vector<FilePath>& paths); | |
| 45 | |
| 46 // Called on the message_loop() thread to dispatch path events. Can't access | |
| 47 // target_ and resolved_target_ directly as those are modified on the | |
| 48 // libdispatch thread. | |
| 49 void DispatchEvents(const std::vector<FilePath>& paths, | |
| 50 const FilePath& target, | |
| 51 const FilePath& resolved_target); | |
| 52 | |
| 53 // Cleans up and stops the event stream. | |
| 54 void CancelOnMessageLoopThread() override; | |
| 55 | |
| 56 // (Re-)Initialize the event stream to start reporting events from | |
| 57 // |start_event|. | |
| 58 void UpdateEventStream(FSEventStreamEventId start_event); | |
| 59 | |
| 60 // Returns true if resolving the target path got a different result than | |
| 61 // last time it was done. | |
| 62 bool ResolveTargetPath(); | |
| 63 | |
| 64 // Report an error watching the given target. | |
| 65 void ReportError(const FilePath& target); | |
| 66 | |
| 67 // Destroy the event stream. | |
| 68 void DestroyEventStream(); | |
| 69 | |
| 70 // Start watching the FSEventStream. | |
| 71 void StartEventStream(FSEventStreamEventId start_event, const FilePath& path); | |
| 72 | |
| 73 // Callback to notify upon changes. | |
| 74 // (Only accessed from the message_loop() thread.) | |
| 75 FilePathWatcher::Callback callback_; | |
| 76 | |
| 77 // Target path to watch (passed to callback). | |
| 78 // (Only accessed from the libdispatch thread.) | |
| 79 FilePath target_; | |
| 80 | |
| 81 // Target path with all symbolic links resolved. | |
| 82 // (Only accessed from the libdispatch thread.) | |
| 83 FilePath resolved_target_; | |
| 84 | |
| 85 // Backend stream we receive event callbacks from (strong reference). | |
| 86 // (Only accessed from the libdispatch thread.) | |
| 87 FSEventStreamRef fsevent_stream_; | |
| 88 | |
| 89 DISALLOW_COPY_AND_ASSIGN(FilePathWatcherFSEvents); | |
| 90 }; | |
| 91 | |
| 92 } // namespace base | |
| 93 | |
| 94 #endif // BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_ | |
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