readthresholdeventsource.h

来自「C++封装的视频采集代码」· C头文件 代码 · 共 50 行

#ifndef READTHRESHOLDEVENTSOURCE_H
#define READTHRESHOLDEVENTSOURCE_H

#include "ReadThresholdEventListener.h"
#include "Misc/NotifierWithParameter.h"

namespace oxsemi
{
    namespace circular_buffer
    {
        template<typename T>
        class ReadThresholdEventSource : public NotifierWithParameter<ReadThresholdEventListener, unsigned>
        {
        public:
            ReadThresholdEventSource(int maxListeners);

            /**
             * @return A T giving the current value of the read threshold for
             *  the specified reader
             */
            virtual T GetReadThreshold(unsigned readerNumber) const = 0;

            /**
             * @param threshold A T specifying the read fill level which when
             *  exceeded should cause any registered listeners to be notified.
             *  If the value given is zero, the registered listeners will be
             *  notified on every occasion where the test against fill level
             *  would have been made
             */
            virtual void SetReadThreshold(
                unsigned readerNumber,
                T threshold) = 0;

            /**
             * @return A bool specifying whether the threshold is currently
             *  exceeded
             */
            virtual bool IsAboveReadThreshold(unsigned readerNumber) const = 0;
        };

        template<typename T> ReadThresholdEventSource<T>::ReadThresholdEventSource(int maxListeners) :
            NotifierWithParameter<ReadThresholdEventListener, unsigned>(maxListeners)
        {
        }
    }
}

#endif        //  #if !defined(__READTHRESHOLDEVENTSOURCE_H__)