AFPSubscriberEventChannel.h

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 * Copyright (c) 2009-2010 Philipp Werner <philipp.werner@st.ovgu.de>
 *                         Michael Schulze <mschulze@ivs.cs.uni-magdeburg.de>
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#ifndef __AFPSUBSCRIBEREVENTCHANNEL_H_A97131CF417B97__
#define __AFPSUBSCRIBEREVENTCHANNEL_H_A97131CF417B97__


#include "mw/afp/Defragmentation.h"

#include "mw/common/Event.h"
#include "mw/common/Subject.h"
#include "mw/api/CallBack.h"


namespace famouso {
    namespace mw {
        namespace afp {


            using famouso::mw::Event;
            using famouso::mw::Subject;


            template < class SEC, class AFPDC, class EventType = Event >
            class AFPSubscriberEventChannel {

                    /* The order of member declarations is important! The sec has to
                     * be destructed first to ensure that no callback will happen while
                     * dp is destructed. That's why dp has to be declared first.
                     */

                    DefragmentationProcessor<AFPDC> dp;

                    SEC sec;

                    void incoming_event(famouso::mw::api::SECCallBackData& cbd) {
                        DefragmentationStep<AFPDC> ds(cbd.data, cbd.length);

                        dp.process_fragment(ds);

                        if (ds.event_complete()) {
                            EventType e(cbd.subject);
                            e.data = ds.get_event_data();
                            e.length = ds.get_event_length();

                            if (callback)
                                callback(e);

                            dp.event_processed(ds);
                        }
                    }


                public:
                    famouso::util::Delegate<const EventType &> callback;

                    AFPSubscriberEventChannel(const Subject &s, uint16_t mtu) :
                            dp(mtu), sec(s) {
                    }

                    ~AFPSubscriberEventChannel() {
                    }

                    void subscribe() {
                        sec.callback.template bind < typeof(*this), & AFPSubscriberEventChannel<SEC, AFPDC, EventType>::incoming_event > (this);
                        sec.subscribe();
                    }

                    const Subject &subject() const {
                        return sec.subject();
                    }
            };


        } // namespace afp
    } // namespace mw
} // namespace famouso


#endif // __AFPSUBSCRIBEREVENTCHANNEL_H_A97131CF417B97__