.. _program_listing_file_processors_eventsync_eventsync.cpp:

Program Listing for File eventsync.cpp
======================================

|exhale_lsh| :ref:`Return to documentation for file <file_processors_eventsync_eventsync.cpp>` (``processors/eventsync/eventsync.cpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   // ---------------------------------------------------------------------
   // This file is part of falcon-core.
   //
   // Copyright (C) 2015, 2016, 2017 Neuro-Electronics Research Flanders
   //
   // Falcon-server is free software: you can redistribute it and/or modify
   // it under the terms of the GNU General Public License as published by
   // the Free Software Foundation, either version 3 of the License, or
   // (at your option) any later version.
   //
   // Falcon-server 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 General Public License for more details.
   //
   // You should have received a copy of the GNU General Public License
   // along with falcon-core. If not, see <http://www.gnu.org/licenses/>.
   // ---------------------------------------------------------------------
   
   #include "eventsync.hpp"
   
   EventSync::EventSync() : IProcessor() {
     add_option("target event", target_event_, "The event to synchronize on.");
   }
   
   void EventSync::CreatePorts() {
     data_in_port_ = create_input_port<EventType>(
         EVENTDATA, EventType::Capabilities(), PortInPolicy(SlotRange(1, 256)));
   
     data_out_port_ = create_output_port<EventType>(
         EVENTDATA, EventType::Capabilities(),
         EventType::Parameters(target_event_().event()),
         PortOutPolicy(SlotRange(1)));
   }
   
   void EventSync::Process(ProcessingContext &context) {
     EventType::Data *data_in = nullptr;
     EventType::Data *data_out = nullptr;
     uint64_t target_events_counter = 0;
     timestamps_.reset();
   
     while (!context.terminated()) {
       for (SlotType s = 0; s < data_in_port_->number_of_slots(); ++s) {
         if (!data_in_port_->slot(s)->RetrieveData(data_in)) {
           break;
         }
         ++event_counter_.all_received;
   
         if (*data_in == target_event_()) {
           ++target_events_counter;
           ++event_counter_.target;
           update_latest_ts(data_in);
         } else {
           ++event_counter_.non_target;
         }
         data_in_port_->slot(s)->ReleaseData();
       }
   
       if (target_events_counter == data_in_port_->number_of_slots()) {
         data_out = data_out_port_->slot(0)->ClaimData(false);
         data_out->set_source_timestamp();
         data_out->set_hardware_timestamp(timestamps_.hw);
         data_out->set_event(target_event_());
         data_out_port_->slot(0)->PublishData();
         target_events_counter = 0;
         ++n_events_synced_;
         timestamps_.reset();
       }
     }
   }
   
   void EventSync::Postprocess(ProcessingContext &context) {
     log_and_reset_counters(data_in_port_->name(), event_counter_);
   
     LOG(INFO) << name() << ". " << n_events_synced_ << " events synced.";
     n_events_synced_ = 0;
   }
   
   void EventSync::update_latest_ts(EventType::Data *data_in) {
     if (data_in->source_timestamp() > timestamps_.source) {
       timestamps_.source = data_in->source_timestamp();
     }
     if (data_in->hardware_timestamp() > timestamps_.hw) {
       timestamps_.hw = data_in->hardware_timestamp();
     }
   }
   
   void EventSync::log_and_reset_counters(std::string port_name,
                                          EventCounter &counter) {
     auto msg = ". '" + port_name + "' counters.\n\t\t\t\t" +
                std::to_string(counter.all_received) +
                " events received.\n\t\t\t\t" + std::to_string(counter.target) +
                " target events received.\n\t\t\t\t" +
                std::to_string(counter.non_target) + " non-target events received";
     if (counter.consistent_counters()) {
       LOG(INFO) << name() << msg << ". Counters are consistent.";
     } else {
       LOG(WARNING) << name() << ". Counters are inconsistent.";
     }
   
     counter.reset();
   }
   
   REGISTERPROCESSOR(EventSync)