EnsureOnlyOneSchedule.h

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#ifndef larcore_CoreUtils_EnsureOnlyOneSchedule_h
#define larcore_CoreUtils_EnsureOnlyOneSchedule_h

#include "art/Utilities/Globals.h"
#include "canvas/Utilities/Exception.h"
#include "cetlib_except/demangle.h"

namespace lar {
  template <typename T>
  class EnsureOnlyOneSchedule {
  public:
    EnsureOnlyOneSchedule()
    {
      if (auto const nschedules = art::Globals::instance()->nschedules(); nschedules > 1) {
        throw art::Exception{art::errors::Configuration}
          << "This job uses " << nschedules << " schedules, but the type '"
          << cet::demangle_symbol(typeid(T).name()) << " supports\n"
          << "processing only one event at a time. Please reconfigure your job to use only one "
             "schedule.\n";
      }
    }
  };
}

#endif /* larcore_CoreUtils_EnsureOnlyOneSchedule_h */

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