server_heartbeats_impl.hpp

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/******************************************************************************
** Copyright © 2015 by J.M.McGuiness, isimud@hussar.me.uk
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
 
namespace isimud { namespace ISIMUD_VER_NAMESPACE { namespace exchanges { namespace common {
 
template<class MsgT, unsigned MissedHbs, unsigned HbInterval>
template<class ClientCxn, class MakeHB>
inline
server_hb_t<MsgT, MissedHbs, HbInterval>::server_hb_t(ClientCxn &cxn, MakeHB &&make_hb)
: exit_(false),
   hb_proc_ex(),
   make_hb_msg(std::move(make_hb)),
   heartbeat_sender_thr(std::bind(&server_hb_t::template process<ClientCxn>, this, std::ref(cxn)), std::chrono::duration_cast<std::chrono::microseconds>(heartbeat_interval).count()*2) {
   heartbeat_sender_thr.kernel_priority(thread_traits::heartbeat_thread.priority);
   heartbeat_sender_thr.kernel_affinity(
      typename thread_t::thread_traits::api_params_type::processor_mask_type(thread_traits::heartbeat_thread.core)
   );
   heartbeat_sender_thr.set_name("heartbeats");
}
 
template<class MsgT, unsigned MissedHbs, unsigned HbInterval>
inline void
server_hb_t<MsgT, MissedHbs, HbInterval>::stop() noexcept(true) {
   exit_=true;
}
 
template<class MsgT, unsigned MissedHbs, unsigned HbInterval>
inline
server_hb_t<MsgT, MissedHbs, HbInterval>::~server_hb_t() noexcept(true) {
   stop();
}
 
template<class MsgT, unsigned MissedHbs, unsigned HbInterval>
inline std::string
server_hb_t<MsgT, MissedHbs, HbInterval>::to_string() const noexcept(false) {
   std::ostringstream os;
   os
      <<"max missed heartbeats="<<max_missed_heartbeats
      <<", heartbeat interval="<<heartbeat_interval.count()<<" sec"
      <<", heartbeat core="<<thread_traits::heartbeat_thread
      <<", heartbeat processing-error: '"<<hb_proc_ex<<"'";
   return os.str();
}
 
template<class MsgT, unsigned MissedHbs, unsigned HbInterval>
template<class ClientCxn>
inline void
server_hb_t<MsgT, MissedHbs, HbInterval>::process(ClientCxn &cxn) noexcept {
   try {
      const hb_t hb{make_hb_msg()};
      while (LIKELY(!static_cast<bool>(exit_))) {
         std::this_thread::sleep_for(heartbeat_interval);
         if (LIKELY(!static_cast<bool>(exit_))) {
            cxn.write(hb);
         }
      }
   } catch (...) {
      if (!static_cast<bool>(exit_)) {
         hb_proc_ex=boost::current_exception();
      }
   }
}
 
} } } }