Chapter 1

17.3.1 Maintaining an Outstanding Request
The active example shows the outstanding-request active object pattern, in which RunL()
handles the completion of a previous request and then issues a new request.
Here's the declaration of CFlashingHello:
class CFlashingHello : public CActive
{
public: private:
// Construct/destruct
static CFlashingHello* NewL(CActiveHelloAppView* aAppView);
~CFlashingHello();
// Request
void Start(TTimeIntervalMicroSeconds32 aHalfPeriod);
private:
// Construct/destruct
CFlashingHello();
void ConstructL(CActiveHelloAppView* aAppView);
// from CActive
void RunL();
void DoCancel();
// Utility
void ShowText(TBool eShowText);
private:
// Member variables
RTimer iTimer;
TTimeIntervalMicroSeconds32 iHalfPeriod;
// Pointers elsewhere
CActiveHelloAppView* iAppView;
};
Figure 17.10 shows how it fits into the application program: