RunGuard.h

Go to the documentation of this file.

#pragma once
 
#include <QtCore/QString>
#include <QtCore/QLockFile>
 
class RunGuard
{
public:
    explicit RunGuard(const QString &key);
    ~RunGuard();
 
    // Returns true if another instance holds the lock.
    bool isAnotherRunning();
 
    // Attempts to acquire the single-instance lock.
    bool tryToRun();
 
    // Releases the lock if held.
    void release();
 
    // Optional: returns true if this instance currently holds the lock.
    bool isLocked() const { return _lockFile.isLocked(); }
 
private:
    static QString generateKeyHash(const QString &key, const QString &salt);
    static QString lockDir();
 
    const QString _key;
    const QString _lockFilePath;
    QLockFile _lockFile;
 
    Q_DISABLE_COPY(RunGuard)
};