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----
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----

//paragraph [1] Title: [{\Large \bf \begin {center}] [\end {center}}]
//[TOC] [\tableofcontents]

[1] Header File of the class ~PregelAlgebra~

November 2018, J. Mende


[TOC]

1 Overview

Defines PregelContext class

*/

#include "PregelContext.h"
#include <GenericTC.h>
#include "StandardTypes.h"
#include <boost/log/trivial.hpp>
#include "SecParser.h"
#include "typedefs.h"


namespace pregel {
 PregelContext PregelContext::context;

 const std::string &PregelContext::getFunction() const {
  return this->function;
 }

 void PregelContext::setFunction(std::string &functionText) {
  function.swap(functionText);
  functionText = function;
 }


 int PregelContext::getAddressIndex() const {
  return addressIndex;
 }

 void PregelContext::setAddressIndex(int addressIndex) {
  PregelContext::addressIndex = addressIndex;
 }

 int PregelContext::getMessageServerPort() const {
  return messageServerPort;
 }

 void PregelContext::setMessageServerPort(int messageServerPort) {
  PregelContext::messageServerPort = messageServerPort;
 }

 std::string &PregelContext::getMessageType() {
  return this->messageType;
 }

 void PregelContext::setMessageType(ListExpr messageTypeAsList) {
  std::string messageType = nl->ToString(messageTypeAsList);
  this->messageType.swap(messageType);

  SecondoCatalog *catalog = SecondoSystem::GetCatalog();
  auto numericType = catalog->NumericType(messageTypeAsList);
  setNumericMessageType(numericType);
 }

 void PregelContext::setNumericMessageType(ListExpr numericMessageType) {
    if(tupleType){
      tupleType->DeleteIfAllowed();
    }
    tupleType = new TupleType(numericMessageType);
 }

 void PregelContext::setRoundCounter(const int round) {
  this->superstep = round;
  SuperstepCounter::invalidate();
 }

 void PregelContext::increaseSuperstepCounter() {
  ++superstep;
  SuperstepCounter::invalidate();
 }

 PregelContext &PregelContext::get() {
  return context;
 }

 void PregelContext::addWorker(WorkerConfig worker) noexcept(false) {
  if (workerExists(worker.endpoint, worker.messageServerPort)) {
   throw std::exception();
  }
  workers.push_back(worker);
 }

 bool PregelContext::workerExists(RemoteEndpoint &endpoint,
                                  int messageServerPort) {
  for (auto it = workers.begin(); it != workers.end(); ++it) {
   if (endpoint == (*it).endpoint) {
    return true;
   }
   if (endpoint.host == (*it).endpoint.host &&
       messageServerPort == (*it).messageServerPort) {
    return true;
   }
  }

  return false;
 }

 int PregelContext::closeConnections(){
    int res = workers.size();
    reset(); // clears also the connections
    return res;
 }


 supplier<WorkerConfig> PregelContext::getWorkers() {
  auto it = new std::vector<WorkerConfig>::iterator(workers.begin());
  return static_cast<supplier<WorkerConfig> > ( 
    [this, it]() mutable -> WorkerConfig * {
      if (it != nullptr && *it != workers.end()) {
       WorkerConfig *entry = &(**it);
       ++(*it);
       return entry;
      }

      delete it;
      it = nullptr;
      return nullptr;
    });
 }

 supplier<WorkerConnection> PregelContext::getConnections() {
  auto routes = new supplier<WorkerConfig>(getWorkers());
  return [routes]() mutable -> WorkerConnection * {
    if (routes == nullptr) {
     return nullptr;
    }
    WorkerConfig *entry = (*routes)();
    if (entry == nullptr) {
     delete routes;
     routes = nullptr;
     return nullptr;
    }
    return entry->connection;
  };
 }

 bool superstepValid = false;
 int superstep = 0;

 int SuperstepCounter::get() {
  if (superstepValid) {
   return superstep;
  }
  superstep = PregelContext::get().getCurrentSuperstep();
  superstepValid = true;
  return superstep;
 }

 void SuperstepCounter::invalidate() {
  superstepValid = false;
 }

 int SuperstepCounter::increment() {
  PregelContext::get().increaseSuperstepCounter();
  invalidate();
  return get();
 }
}



std::ostream& operator<<(std::ostream& os,
                         const pregel::PregelContext& context){
   return context.print(os);
}