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#ifndef MULTITHREADING_H_INCLUDED
#define MULTITHREADING_H_INCLUDED
#include <wx/string.h>
#include <wx/thread.h>
const int UI_UPDATE_INTERVAL = 100; //perform ui updates not more often than necessary, 100 seems to be a good value with only a minimal performance loss
bool updateUiIsAllowed(); //test if a specific amount of time is over
void updateUiNow(); //do the updating
//interface for status updates (can be implemented by UI or commandline)
//overwrite virtual methods for respective functionality
class StatusUpdater
{
public:
StatusUpdater() :
abortionRequested(false) {}
virtual ~StatusUpdater() {}
//these methods have to be implemented in the derived classes to handle error and status information
virtual void updateStatusText(const wxString& text) = 0;
virtual void initNewProcess(int objectsTotal, double dataTotal, int processID) = 0; //informs about the total amount of data that will be processed from now on
virtual void updateProcessedData(int objectsProcessed, double dataProcessed) = 0; //called periodically after data was processed
virtual int reportError(const wxString& text) = 0;
//this method is triggered repeatedly by requestUiRefresh() and can be used to refresh the ui by dispatching pending events
virtual void forceUiRefresh() = 0;
void requestUiRefresh(bool asyncProcessActive = false)
{
if (updateUiIsAllowed()) //test if specific time span between ui updates is over
forceUiRefresh();
if (abortionRequested && !asyncProcessActive)
abortThisProcess(); //abort can be triggered by requestAbortion()
}
void requestAbortion() //opportunity to abort must be implemented in a frequently executed method like requestUiRefresh()
{ //currently used by the UI status information screen, when button "Abort is pressed"
abortionRequested = true;
}
static const int continueNext = -1;
static const int retry = -2;
protected:
virtual void abortThisProcess() = 0;
bool abortionRequested;
};
class WorkerThread;
//class handling execution of a method while updating the UI
class UpdateWhileExecuting
{
friend class WorkerThread;
public:
UpdateWhileExecuting();
virtual ~UpdateWhileExecuting();
void waitUntilReady();
void execute(StatusUpdater* statusUpdater);
private:
//implement a longrunning method without dependencies (e.g. copy file function); share input/output parameters as instance variables
virtual void longRunner() = 0;
WorkerThread* theWorkerThread;
wxMutex readyToReceiveResult;
wxCondition receivingResult;
bool workDone; //workaround for a bug in wxWidgets v2.8.9 class wxCondition: signals might get lost
};
#endif // MULTITHREADING_H_INCLUDED
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