filter_levelmachine.h

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#pragma once
#include "filter_intf.h"
 
namespace adtf
{
namespace streaming
{
namespace ant
{

class cFilterLevelmachine : public adtf::ucom::level_machine < cFilterLevelmachine,
                                                                        IFilter::tFilterState,
                                                                        IFilter::tFilterState::State_Shutdown >
{
    //friend class cFilterBase;
 
protected:
    cFilterLevelmachine() = default;
    cFilterLevelmachine(const cFilterLevelmachine&) = delete;
    cFilterLevelmachine(cFilterLevelmachine&&) = delete;
    cFilterLevelmachine& operator=(const cFilterLevelmachine&) = delete;
    cFilterLevelmachine& operator=(cFilterLevelmachine&&) = delete;
    virtual ~cFilterLevelmachine() = default;
 
public:
    enum tInitStage : uint8_t
    {
        StageFirst = 0,
        StageNormal = 1,
        StagePreConnect = StageNormal,
        StageGraphReady = 2,
        StagePostConnect = StageGraphReady,
    };
 
protected:
    tResult InitStageFirst();
    tResult InitStageNormal();
    tResult InitStageReady();
    tResult ShutdownStageReady();
    tResult ShutdownStageNormal();
    tResult ShutdownStageFirst();
 
protected:
    tResult SetLevel(IFilter::tFilterState eLevel);

    virtual tResult Init(cFilterLevelmachine::tInitStage eStage);

    virtual tResult Start();

    virtual tResult Stop();

    virtual tResult Shutdown(cFilterLevelmachine::tInitStage eStage);
};
 
} //namespace ant
} //namespace streaming
} //namespace adtf