single_instance_manager.h

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#ifndef COCKATRICE_SINGLE_INSTANCE_MANAGER_H
#define COCKATRICE_SINGLE_INSTANCE_MANAGER_H
 
#include <QObject>
#include <QString>
#include <QStringList>
#include <qtmetamacros.h>
 
class QLocalServer;
 
class SingleInstanceManager : public QObject
{
    Q_OBJECT
public:
    explicit SingleInstanceManager(QObject *parent = nullptr);
 
    // Returns true if this process became the primary instance, false if
    // another instance is already running (and received our files).
    bool tryRun(const QStringList &initialFiles);
 
signals:
    void filesReceived(const QStringList &files);
 
private slots:
    void handleNewConnection();
 
private:
    enum class ForwardResult
    {
        Delivered,  // a live primary acknowledged the payload
        NoPrimary,  // no connectable primary socket exists
        PrimaryBusy // a primary exists but did not acknowledge in time
    };
 
    ForwardResult forwardToPrimary(const QStringList &filesToSend);
 
    QString serverName;
    QLocalServer *server = nullptr;
};
 
#endif // COCKATRICE_SINGLE_INSTANCE_MANAGER_H