AFPPublisherEventChannel.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 __AFPPUBLISHEREVENTCHANNEL_H_472698B5E7680A__
#define __AFPPUBLISHEREVENTCHANNEL_H_472698B5E7680A__


#include "mw/afp/Fragmenter.h"
#include "mw/afp/CommonPolicySelector.h"

#include "debug.h"
#include "mw/common/Event.h"

#include "assert/staticerror.h"


namespace famouso {
    namespace mw {
        namespace afp {


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


            template < class PEC, class AFPFC, uint32_t mtu, class EventType = Event >
            class AFPPublisherEventChannel : public PEC  {

                    typedef CommonPolicySelector<AFPFC> FCP;

                    FAMOUSO_STATIC_ASSERT_ERROR(mtu == (typename FCP::SizeProp::flen_t)mtu,
                                                MTU_too_large_for_used_SizeProperties, ());

                    enum { _mtu = mtu };

                    uint8_t _buffer[_mtu];

                public:

                    AFPPublisherEventChannel(const Subject & s) :
                            PEC(s) {
                    }

                    bool publish(const EventType & e) {
                        Event fragment_e(e.subject);
                        fragment_e.data = _buffer;

                        if (e.length != (typename FCP::SizeProp::elen_t) e.length) {
                            ::logging::log::emit< ::logging::Error>()
                                << PROGMEMSTRING("AFP: Cannot publish event... too large.")
                                << ::logging::log::endl;
                            return false;
                        }

                        afp::Fragmenter<AFPFC, _mtu> f(e.data, e.length);

                        if (f.error())
                            return false;

                        while ( (fragment_e.length = f.get_fragment(fragment_e.data)) ) {
                            PEC::publish(fragment_e);
                        }

                        return !f.error();
                    }
            };


            template <class PEC, class AFPFC, class EventType>
            class AFPPublisherEventChannel<PEC, AFPFC, 0, EventType> : public PEC  {

                    typedef CommonPolicySelector<AFPFC> FCP;

                    typedef typename FCP::Allocator Allocator;

                    uint32_t _mtu;

                    uint8_t * _buffer;

                public:

                    AFPPublisherEventChannel(const Subject &s, uint16_t mtu)
                            : PEC(s), _mtu(mtu) {
                        _buffer = Allocator::alloc(mtu);
                        if (!_buffer) {
                            ::logging::log::emit< ::logging::Error>()
                                << PROGMEMSTRING("AFP: Out of memory")
                                << ::logging::log::endl;
                        }
                    }

                    ~AFPPublisherEventChannel() {
                        if (_buffer)
                            Allocator::free(_buffer);
                    }

                    bool publish(const EventType & e) {
                        if (!_buffer)
                            return false;

                        Event fragment_e(e.subject);
                        fragment_e.data = _buffer;

                        if (e.length != (typename FCP::SizeProp::elen_t) e.length) {
                            ::logging::log::emit< ::logging::Error>()
                                << PROGMEMSTRING("AFP: Cannot publish event... too large.")
                                << ::logging::log::endl;
                            return false;
                        }

                        afp::Fragmenter<AFPFC> f(e.data, e.length, _mtu);

                        if (f.error())
                            return false;

                        while ( (fragment_e.length = f.get_fragment(fragment_e.data)) ) {
                            PEC::publish(fragment_e);
                        }

                        return !f.error();
                    }
            };

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


#endif // __AFPPUBLISHEREVENTCHANNEL_H_472698B5E7680A__