JDistributer.cc

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#include <string>
#include <iostream>
#include <iomanip>
#include <vector>

#include "JDAQ/JDAQTimesliceIO.hh"
#include "JDAQ/JDAQEventIO.hh"
#include "JDAQ/JDAQSummarysliceIO.hh"

#include "JDAQ/JDAQTags.hh"
#include "JNet/JControlHostObjectIterator.hh"
#include "JNet/JControlHostObjectOutput.hh"
#include "JLang/JSinglePointer.hh"

#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"


/**
 * \file
 *
 * Example program to distribute data through control host.
 * \author gmaggi
 */
int main(int argc, char* argv[])
{
  using namespace std;
  using namespace JPP;
  using namespace KM3NETDAQ;

  string    hostname;
  vector<JHostname> destinations;
  int       debug;

  try {

    JParser<> zap("Example program to distribute data through control host.");

    zap['H'] = make_field(hostname)         = "localhost";
    zap['D'] = make_field(destinations);
    zap['d'] = make_field(debug)            = 1;

    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }


  typedef JDAQEvent   data_type;

  if (destinations.empty()) {
    FATAL("Destination is empty" << endl);
  }
  

  typedef JSinglePointer< JControlHostObjectOutput<data_type> >  pointerHostObject_t;

  vector<pointerHostObject_t> output;
    
  for (vector<JHostname>::iterator i = destinations.begin(); !destinations.empty(); ) {

    DEBUG("Connection " << *i << ' ' << flush);

    try {

      output.push_back(new JControlHostObjectOutput<data_type>(*i));

      i = destinations.erase(i);      // okay; remove destination

      DEBUG("succeeded.");
    }
    catch(const exception& error) {      
      ++i;                            // skip; maintain destination
      DEBUG("failed.");
    }
    DEBUG(endl);

    if (i == destinations.end()) {    // round robin
      sleep(1);
      i = destinations.begin();
    }
  }
    
  vector<pointerHostObject_t>::iterator out = output.begin();

  try {

    JControlHostObjectIterator<data_type> in(hostname);

    while (in.hasNext()) {

      data_type* p = in.next();

      DEBUG("I got data " << endl);

      try {
        (*out)->put(*p);
        ++out;                        // okay; maintain destination
      }
      catch(const exception& error) {
        ERROR(error.what() << endl);
        out = output.erase(out);      // error; remove destination
      }

      if (out == output.end()) {      // round robin
        out = output.begin();
      }
    }
  }
  catch(const exception& error) {
    ERROR(error.what() << endl);
  }
}