singleapplication.h

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// SPDX-FileCopyrightText: 2014 Anne Jan Brouwer
// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef SRC_SINGLEAPPLICATION_H_
#define SRC_SINGLEAPPLICATION_H_
 
#include <QApplication>
#include <QLocalServer>
#include <QSharedMemory>

class SingleApplication : public QApplication {
  Q_OBJECT
 
public:
  SingleApplication(int &argc, char *argv[], // NOLINT(modernize-avoid-c-arrays)
                    QString uniqueKey);
  auto isRunning() -> bool;
  auto sendMessage(const QString &message) -> bool;
 
public slots:
  void receiveMessage();
 
signals:
  void messageAvailable(const QString &message);
 
private:
  auto peerIsListening() -> bool;
  void becomePrimary();
  auto forwardMessage(const QString &message) -> bool;

  bool _isRunning;
  QString _uniqueKey;
  QSharedMemory sharedMemory;
  QScopedPointer<QLocalServer> localServer;

  static const int timeout = 1000;
  static const int maxMessageBytes = 64 * 1024;
  static const int takeoverProbes = 5;
  static const int takeoverProbeIntervalMs = 100;
};
 
#endif // SRC_SINGLEAPPLICATION_H_