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#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/InputSource.h"
#include "FWCore/ParameterSet/interface/ConfigurationDescriptions.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
#include "FWCore/Sources/interface/IDGeneratorSourceBase.h"
/*
* IDGeneratorSourceBase implements the logic to generate run, lumi, and event numbers, and event timestamps.
* These will actually be overwritten by this source, but it's easier to do that than to write a new source base
* type from scratch.
*/
class EmptySourceFromEventIDs : public edm::IDGeneratorSourceBase<edm::InputSource> {
public:
explicit EmptySourceFromEventIDs(edm::ParameterSet const&, edm::InputSourceDescription const&);
~EmptySourceFromEventIDs() override = default;
static void fillDescriptions(edm::ConfigurationDescriptions& descriptions);
private:
bool setRunAndEventInfo(edm::EventID& id, edm::TimeValue_t& time, edm::EventAuxiliary::ExperimentType& type) override;
void readEvent_(edm::EventPrincipal& e) override;
std::vector<edm::EventID> events_;
};
// Note that almost all configuration parameters passed to IDGeneratorSourceBase will effectively be ignored, because
// the EmptySourceFromEventIDs will explicitly set the run, lumi, and event numbers, the timestamp, and the event type.
EmptySourceFromEventIDs::EmptySourceFromEventIDs(edm::ParameterSet const& config,
edm::InputSourceDescription const& desc)
: IDGeneratorSourceBase<InputSource>(config, desc, false),
events_{config.getUntrackedParameter<std::vector<edm::EventID>>("events")} // List of event ids to create
{
// Invert the order of the events so they can efficiently be popped off the back of the vector
std::reverse(events_.begin(), events_.end());
}
bool EmptySourceFromEventIDs::setRunAndEventInfo(edm::EventID& event,
edm::TimeValue_t& time,
edm::EventAuxiliary::ExperimentType& type) {
if (events_.empty()) {
return false;
}
event = events_.back();
events_.pop_back();
return true;
}
void EmptySourceFromEventIDs::readEvent_(edm::EventPrincipal& e) {
doReadEvent(e, [](auto const&) {});
}
void EmptySourceFromEventIDs::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
edm::ParameterSetDescription desc;
desc.setComment("Creates runs, lumis and events (containing no products) based on the provided list of event ids.");
edm::IDGeneratorSourceBase<edm::InputSource>::fillDescription(desc);
desc.addUntracked<std::vector<edm::EventID>>("events", {});
descriptions.add("source", desc);
}
#include "FWCore/Framework/interface/InputSourceMacros.h"
DEFINE_FWK_INPUT_SOURCE(EmptySourceFromEventIDs);
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