GatewayEventChannel.h

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 * Copyright (c) 2008-2010 Michael Schulze <mschulze@ivs.cs.uni-magdeburg.de>
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#ifndef __GatewayEventChannel_h__
#define __GatewayEventChannel_h__

#include "mw/api/SubscriberEventChannel.h"
#include "mw/nl/DistinctNL.h"

namespace famouso {
    namespace mw {
        namespace gwl {

            template < class ECH >
            class GatewayEventChannel : public famouso::mw::api::SubscriberEventChannel<ECH> {

                    typedef famouso::mw::api::SubscriberEventChannel< ECH > BASE;

                    const famouso::mw::nl::DistinctNL * const _bnl;
                public:

                    void *operator new(size_t size, void* buffer) {
                        return buffer;
                    }

                    GatewayEventChannel(const Subject &s, const famouso::mw::nl::DistinctNL * const bnl) : BASE(s), _bnl(bnl) {
                        TRACE_FUNCTION;

                        this->ech().subscribe(*this);
                        // initialize the forwarding callback
                        this->callback.template bind<GatewayEventChannel, &GatewayEventChannel::forward>(this);
                    }

                private:

                    void forward(famouso::mw::api::SECCallBackData& cbd) {
                        TRACE_FUNCTION;

                        // If the event is from the another network as the subscription it will
                        // be published, otherwise it would an reflection in the same network
                        // the event would arise twice at the subscribers.
                        if (! this->ech().event_from_network_with_id(_bnl))
                            this->ech().publish_to_network_with_id(this->snn(), cbd, _bnl);
                    }

            };

        } // namespace gwl
    } // namespace mw
} // namespace famouso


#endif /* __GatewayEventChannel_h__ */