mirror of
https://github.com/nextcloud/desktop.git
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134 lines
3.6 KiB
C++
134 lines
3.6 KiB
C++
/*
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* Copyright (C) by Klaas Freitag <freitag@owncloud.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#ifndef MIRALL_FOLDERWATCHER_H
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#define MIRALL_FOLDERWATCHER_H
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#include "config.h"
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#include <QList>
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#include <QLoggingCategory>
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#include <QObject>
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#include <QString>
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#include <QStringList>
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#include <QElapsedTimer>
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#include <QHash>
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#include <QScopedPointer>
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#include <QSet>
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#include <QDir>
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class QTimer;
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namespace OCC {
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Q_DECLARE_LOGGING_CATEGORY(lcFolderWatcher)
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class FolderWatcherPrivate;
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class Folder;
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/**
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* @brief Monitors a directory recursively for changes
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*
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* Folder Watcher monitors a directory and its sub directories
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* for changes in the local file system. Changes are signalled
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* through the pathChanged() signal.
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*
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* @ingroup gui
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*/
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class FolderWatcher : public QObject
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{
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Q_OBJECT
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public:
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// Construct, connect signals, call init()
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explicit FolderWatcher(Folder *folder = nullptr);
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~FolderWatcher() override;
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/**
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* @param root Path of the root of the folder
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*/
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void init(const QString &root);
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/* Check if the path is ignored. */
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bool pathIsIgnored(const QString &path);
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/**
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* Returns false if the folder watcher can't be trusted to capture all
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* notifications.
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*
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* For example, this can happen on linux if the inotify user limit from
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* /proc/sys/fs/inotify/max_user_watches is exceeded.
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*/
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bool isReliable() const;
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/**
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* Triggers a change in the path and verifies a notification arrives.
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*
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* If no notification is seen, the folderwatcher marks itself as unreliable.
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* The path must be ignored by the watcher.
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*/
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void startNotificatonTest(const QString &path);
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/// For testing linux behavior only
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int testLinuxWatchCount() const;
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signals:
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/** Emitted when one of the watched directories or one
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* of the contained files is changed. */
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void pathChanged(const QString &path);
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/**
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* Emitted if some notifications were lost.
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*
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* Would happen, for example, if the number of pending notifications
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* exceeded the allocated buffer size on Windows. Note that the folder
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* watcher could still be able to capture all future notifications -
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* i.e. isReliable() is orthogonal to losing changes occasionally.
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*/
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void lostChanges();
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/**
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* Signals when the watcher became unreliable. The string is a translated
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* message that can be shown to users.
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*/
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void becameUnreliable(const QString &message);
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protected slots:
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// called from the implementations to indicate a change in path
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void changeDetected(const QString &path);
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void changeDetected(const QStringList &paths);
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private slots:
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void startNotificationTestWhenReady();
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protected:
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QHash<QString, int> _pendingPathes;
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private:
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QScopedPointer<FolderWatcherPrivate> _d;
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QElapsedTimer _timer;
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QSet<QString> _lastPaths;
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Folder *_folder;
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bool _isReliable = true;
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void appendSubPaths(QDir dir, QStringList& subPaths);
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/** Path of the expected test notification */
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QString _testNotificationPath;
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friend class FolderWatcherPrivate;
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};
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}
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#endif
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