Check and read the EventHeader every event

tmadlener · Nov 17, 2023 · 5f78229 · 5f78229
1 parent ef50161
commit 5f78229
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Showing 2 changed files with 8 additions and 5 deletions.
diff --git a/k4FWCore/components/PodioInput.cpp b/k4FWCore/components/PodioInput.cpp
@@ -184,14 +184,15 @@ PodioInput::PodioInput(const std::string& name, ISvcLocator* svcLoc) : Consumer(
     error() << "Could not get PodioDataSvc" << endmsg;
   }
   fillReaders();
-
-  auto key = edm4hep::EventHeaderName;
-  if (std::find(m_collectionNames.begin(), m_collectionNames.end(), key) == m_collectionNames.end()) {
-    m_collectionNames.value().push_back(key);
-  }
 }
 
 void PodioInput::operator()() const {
+  if (m_podioDataSvc->hasCollection(edm4hep::EventHeaderName)) {
+    m_readers[edm4hep::EventHeaderCollection::typeName](edm4hep::EventHeaderName);
+  } else {
+    info() << "No EventHeader collection found in the event. Not reading it" << endmsg;
+  }
+
   for (auto& collName : m_collectionNames) {
     debug() << "Registering collection to read " << collName << endmsg;
     auto type = m_podioDataSvc->getCollectionType(collName);

diff --git a/k4FWCore/include/k4FWCore/PodioDataSvc.h b/k4FWCore/include/k4FWCore/PodioDataSvc.h
@@ -88,6 +88,8 @@ class PodioDataSvc : public DataSvc {
   /// TODO: Make this private again after conversions have been properly solved
   podio::Frame& getMetaDataFrame() { return m_metadataframe; }
 
+  bool hasCollection(const std::string& name) const { return m_eventframe.get(name); }
+
 private:
   /// PODIO reader for ROOT files
   podio::ROOTFrameReader m_reader;