.. _program_listing_file_falcon_istreamports.cpp:

Program Listing for File istreamports.cpp
=========================================

|exhale_lsh| :ref:`Return to documentation for file <file_falcon_istreamports.cpp>` (``falcon/istreamports.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 <map>
   #include <utility>
   #include <vector>
   
   #include "istreamports.hpp"
   #include "iprocessor.hpp"
   
   void ISlotOut::Connect(ISlotIn *downstream) {
     if (downstream_slots_.count(downstream) == 0) {
       downstream_slots_.insert(downstream);
     } else {
       throw std::runtime_error("Attempting to connect input slot twice.");
     }
   }
   
   std::vector<RingSequence *> ISlotOut::gating_sequences() {
     std::vector<RingSequence *> v;
     for (auto &it : downstream_slots_) {
       v.push_back(it->sequence());
     }
     return v;
   }
   
   void ISlotIn::ReleaseData() {
     if (nretrieved_ > 0) {
       int64_t value = sequence_.IncrementAndGet(nretrieved_);
       nretrieved_ = 0;
   
       if (value + 1 < 0) {
         sequence_.set_sequence(INT64_MAX);
       }
     }
   }
   
   void ISlotIn::Connect(ISlotOut *upstream) {
     if (connected()) {
       throw std::runtime_error("Error connecting to slot (already connected)");
     }
   
     upstream_ = upstream;
   }
   
   void ISlotIn::NegotiateUpstream() {
     upstream_->parent()->parent()->internal_NegotiateConnections();
   }
   
   void ISlotIn::PrepareProcessing() {
     sequence_.set_sequence(-1L);
     ncached_ = 0;
     cache_ = nullptr;
     nretrieved_ = 0;
   }
   
   YAML::Node IPortOut::ExportYAML() const {
     YAML::Node node;
     node["datatype"] = datatype();
     node["nslots_min"] = policy().min_slot_number();
     node["nslots_max"] = policy().max_slot_number();
     node["buffer_size"] = policy().buffer_size();
     if (policy().wait_strategy() == WaitStrategy::kBlockingStrategy) {
       node["wait_strategy"] = "blocking";
     } else if (policy().wait_strategy() == WaitStrategy::kSleepingStrategy) {
       node["wait_strategy"] = "sleeping";
     } else if (policy().wait_strategy() == WaitStrategy::kYieldingStrategy) {
       node["wait_strategy"] = "yielding";
     } else {
       node["wait_strategy"] = "busy spin";
     }
     return node;
   }
   
   YAML::Node IPortIn::ExportYAML() const {
     YAML::Node node;
     node["datatype"] = datatype();
     node["nslots_min"] = policy().min_slot_number();
     node["nslots_max"] = policy().max_slot_number();
     node["cache"] = policy().cache_enabled();
     return node;
   }