RetryState.h

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#pragma once
 
#include "QGCState.h"
 
#include <QtCore/QTimer>
 
#include <functional>
 
class RetryState : public QGCState
{
    Q_OBJECT
    Q_DISABLE_COPY(RetryState)
 
public:
    using Action = std::function<bool()>;
 
    enum ExhaustedBehavior {
        EmitError,      
        EmitAdvance     
    };
    Q_ENUM(ExhaustedBehavior)
 
    RetryState(const QString& stateName, QState* parent,
               Action action,
               int maxRetries = 0,
               int retryDelayMsecs = 1000,
               ExhaustedBehavior exhaustedBehavior = EmitError);
 
    int currentAttempt() const { return _currentAttempt; }
    int maxRetries() const { return _maxRetries; }
    int totalAttempts() const { return _maxRetries + 1; }
    ExhaustedBehavior exhaustedBehavior() const { return _exhaustedBehavior; }
    bool wasSkipped() const { return _wasSkipped; }
 
signals:
    void retrying(int attempt, int maxAttempts);
 
    void succeeded();
 
    void exhausted();
 
    void skipped();
 
protected:
    void onEnter() override;
 
private slots:
    void _executeAction();
 
private:
    Action _action;
    int _maxRetries = 0;
    int _retryDelayMsecs = 1000;
    ExhaustedBehavior _exhaustedBehavior = EmitError;
 
    int _currentAttempt = 0;
    bool _wasSkipped = false;
    QTimer _retryTimer;
};