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100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
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#define BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
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#include <CoreServices/CoreServices.h>
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#include <stddef.h>
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#include <vector>
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#include "base/files/file_path.h"
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#include "base/files/file_path_watcher.h"
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#include "base/mac/scoped_dispatch_object.h"
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#include "base/macros.h"
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#include "base/memory/weak_ptr.h"
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namespace base {
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// Mac-specific file watcher implementation based on FSEvents.
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// There are trade-offs between the FSEvents implementation and a kqueue
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// implementation. The biggest issues are that FSEvents on 10.6 sometimes drops
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// events and kqueue does not trigger for modifications to a file in a watched
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// directory. See file_path_watcher_mac.cc for the code that decides when to
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// use which one.
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class FilePathWatcherFSEvents : public FilePathWatcher::PlatformDelegate {
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public:
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FilePathWatcherFSEvents();
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~FilePathWatcherFSEvents() override;
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// FilePathWatcher::PlatformDelegate overrides.
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bool Watch(const FilePath& path,
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bool recursive,
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const FilePathWatcher::Callback& callback) override;
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void Cancel() override;
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private:
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static void FSEventsCallback(ConstFSEventStreamRef stream,
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void* event_watcher,
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size_t num_events,
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void* event_paths,
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const FSEventStreamEventFlags flags[],
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const FSEventStreamEventId event_ids[]);
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// Called from FSEventsCallback whenever there is a change to the paths.
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void OnFilePathsChanged(const std::vector<FilePath>& paths);
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// Called on the message_loop() thread to dispatch path events. Can't access
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// target_ and resolved_target_ directly as those are modified on the
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// libdispatch thread.
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void DispatchEvents(const std::vector<FilePath>& paths,
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const FilePath& target,
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const FilePath& resolved_target);
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// (Re-)Initialize the event stream to start reporting events from
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// |start_event|.
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void UpdateEventStream(FSEventStreamEventId start_event);
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// Returns true if resolving the target path got a different result than
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// last time it was done.
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bool ResolveTargetPath();
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// Report an error watching the given target.
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void ReportError(const FilePath& target);
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// Destroy the event stream.
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void DestroyEventStream();
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// Start watching the FSEventStream.
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void StartEventStream(FSEventStreamEventId start_event, const FilePath& path);
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// Callback to notify upon changes.
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// (Only accessed from the message_loop() thread.)
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FilePathWatcher::Callback callback_;
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// The dispatch queue on which the the event stream is scheduled.
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ScopedDispatchObject<dispatch_queue_t> queue_;
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// Target path to watch (passed to callback).
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// (Only accessed from the libdispatch queue.)
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FilePath target_;
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// Target path with all symbolic links resolved.
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// (Only accessed from the libdispatch queue.)
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FilePath resolved_target_;
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// Backend stream we receive event callbacks from (strong reference).
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// (Only accessed from the libdispatch queue.)
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FSEventStreamRef fsevent_stream_;
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WeakPtrFactory<FilePathWatcherFSEvents> weak_factory_;
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DISALLOW_COPY_AND_ASSIGN(FilePathWatcherFSEvents);
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};
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} // namespace base
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#endif // BASE_FILES_FILE_PATH_WATCHER_FSEVENTS_H_
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