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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QFILESYSTEMWATCHER_FSEVENTS_P_H
#define QFILESYSTEMWATCHER_FSEVENTS_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qfilesystemwatcher_p.h"
#include <QtCore/qhash.h>
#include <QtCore/qmutex.h>
#include <QtCore/qsocketnotifier.h>
#include <QtCore/qthread.h>
#include <dispatch/dispatch.h>
#include <CoreServices/CoreServices.h>
QT_REQUIRE_CONFIG(filesystemwatcher);
QT_BEGIN_NAMESPACE
class QFseventsFileSystemWatcherEngine : public QFileSystemWatcherEngine
{
Q_OBJECT
public:
~QFseventsFileSystemWatcherEngine();
static QFseventsFileSystemWatcherEngine *create(QObject *parent);
QStringList addPaths(const QStringList &paths, QStringList *files, QStringList *directories);
QStringList removePaths(const QStringList &paths, QStringList *files, QStringList *directories);
void processEvent(ConstFSEventStreamRef streamRef, size_t numEvents, char **eventPaths, const FSEventStreamEventFlags eventFlags[], const FSEventStreamEventId eventIds[]);
Q_SIGNALS:
void emitFileChanged(const QString &path, bool removed);
void emitDirectoryChanged(const QString &path, bool removed);
void scheduleStreamRestart();
private slots:
void doEmitFileChanged(const QString &path, bool removed);
void doEmitDirectoryChanged(const QString &path, bool removed);
bool restartStream();
private:
struct Info {
QString origPath;
timespec ctime;
mode_t mode;
QString watchedPath;
Info(): mode(0)
{
ctime.tv_sec = 0;
ctime.tv_nsec = 0;
}
Info(const QString &origPath, const timespec &ctime, mode_t mode, const QString &watchedPath)
: origPath(origPath)
, ctime(ctime)
, mode(mode)
, watchedPath(watchedPath)
{}
};
typedef QHash<QString, Info> InfoByName;
typedef QHash<QString, InfoByName> FilesByPath;
struct DirInfo {
Info dirInfo;
InfoByName entries;
};
typedef QHash<QString, DirInfo> DirsByName;
typedef QHash<QString, qint64> PathRefCounts;
struct WatchingState {
// These fields go hand-in-hand. FSEvents watches paths, and there is no use in watching
// the same path multiple times. So, the "refcount" on a path is the number of watched
// files that have the same path, plus the number of directories that have the same path.
//
// If the stream fails to start after adding files/directories, the watcher will try to
// keep watching files/directories that it was already watching. It does that by restoring
// the previous WatchingState and restarting the stream.
FilesByPath watchedFiles;
DirsByName watchedDirectories;
PathRefCounts watchedPaths;
};
QFseventsFileSystemWatcherEngine(QObject *parent);
bool startStream();
void stopStream(bool isStopped = false);
InfoByName scanForDirEntries(const QString &path);
bool derefPath(const QString &watchedPath);
bool checkDir(DirsByName::iterator &it);
bool rescanDirs(const QString &path);
bool rescanFiles(InfoByName &filesInPath);
bool rescanFiles(const QString &path);
QMutex lock;
dispatch_queue_t queue;
FSEventStreamRef stream;
FSEventStreamEventId lastReceivedEvent;
WatchingState watchingState;
};
QT_END_NAMESPACE
#endif // QFILESYSTEMWATCHER_FSEVENTS_P_H
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