.. _program_listing_file_processors_eventsource_eventsource.cpp:

Program Listing for File eventsource.cpp
========================================

|exhale_lsh| :ref:`Return to documentation for file <file_processors_eventsource_eventsource.cpp>` (``processors/eventsource/eventsource.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 "eventsource.hpp"
   
   #include <chrono>
   #include <random>
   #include <thread>
   
   EventSource::EventSource() : IProcessor() {
     add_option("events", event_list_, "List of events to generate.");
     add_option("rate", event_rate_,
                "Rate (in Hz) at which events are generated.");
   }
   
   void EventSource::Configure(const GlobalContext &context) {
     for (auto &el : event_list_()) {
       LOG(INFO) << name() << ". Event " << el << " configured for streaming.";
     }
   
     LOG(INFO) << name() << ". Event rate set to " << event_rate_.to_string();
   }
   
   void EventSource::CreatePorts() {
     event_port_ = create_output_port<EventType>(
         EVENTDATA, EventType::Capabilities(),
         EventType::Parameters(DEFAULT_EVENT), PortOutPolicy(SlotRange(1)));
   }
   
   void EventSource::Process(ProcessingContext &context) {
     EventType::Data *data = nullptr;
   
     if (event_list_().size() == 0) {
       return;
     }
   
     std::default_random_engine generator;
     std::uniform_int_distribution<unsigned int> distribution(
         0, event_list_().size() - 1);
   
     auto delay = std::chrono::milliseconds(
         static_cast<unsigned int>(1000.0 / event_rate_()));
   
     while (!context.terminated()) {
       std::this_thread::sleep_for(delay);
       data = event_port_->slot(0)->ClaimData(false);
       data->set_source_timestamp();
       data->set_hardware_timestamp(static_cast<uint64_t>(
           data->time_since(context.run().start_time()).count()));
   
       data->set_event(event_list_()[distribution(generator)]);
       event_port_->slot(0)->PublishData();
     }
   }
   
   REGISTERPROCESSOR(EventSource)