EventFormatMetaDataTool.cxx

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// Dear emacs, this is -*- c++ -*-
/* Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration */
 
 
// System include(s):
#include <algorithm>
#include <stdexcept>
#include <utility>
#include <vector>
 
// Gaudi/Athena include(s):
#include "AthenaKernel/errorcheck.h"
 
// Local include(s):
#include "EventFormatMetaDataTool.h"
 
namespace xAODMaker {
 
 
EventFormatMetaDataTool::EventFormatMetaDataTool(const std::string& type,
                                                 const std::string& name,
                                                 const IInterface* parent):
    base_class(type, name, parent) { }
 
StatusCode
    EventFormatMetaDataTool::initialize() {
      // Greet the user:
      ATH_MSG_VERBOSE("Initialising");
      ATH_MSG_VERBOSE("  " << m_inputMetaStore);
      ATH_MSG_VERBOSE("  " << m_outputMetaStore);
      if (!m_keys.empty()) {
        ATH_MSG_VERBOSE("Asked to copy EventFormat with keys:");
        for (const std::string& key : m_keys) {
          ATH_MSG_VERBOSE("  - " << key);
        }
      }
 
      // Connect to the metadata stores:
      ATH_CHECK(m_inputMetaStore.retrieve());
      ATH_CHECK(m_outputMetaStore.retrieve());
 
      // Return gracefully:
      return StatusCode::SUCCESS;
    }
 
StatusCode
    EventFormatMetaDataTool::beginInputFile() {
      // lock the tool, so metaDataStop will wait for write to finish
      std::lock_guard< std::mutex > guard(m_outputMutex);
 
      // Create object to hold information from the new file
      auto format = std::make_unique< xAOD::EventFormat >();
 
      ATH_CHECK(collectMetaData());
 
      return StatusCode::SUCCESS;
    }
 
StatusCode
    EventFormatMetaDataTool::metaDataStop() {
      // wait for threads currently writing to finish
      std::lock_guard< std::mutex > guard(m_outputMutex);
 
      return StatusCode::SUCCESS;
    }
 
StatusCode
    EventFormatMetaDataTool::collectMetaData() {
 
      std::vector< std::string > keys = m_keys;
      if (keys.empty()) {
        m_inputMetaStore->keys<xAOD::EventFormat>(keys);
      } else {
        // remove keys not in the InputMetaDataStore
        keys.erase(
            std::remove_if(
                keys.begin(), keys.end(),
                [this](std::string& key) {
                  return !m_inputMetaStore->contains<xAOD::EventFormat>(key);
                }),
            keys.end());
      }
 
      // If the input file doesn't have any event format metadata,
      // then finish right away:
      if (keys.empty()) return StatusCode::SUCCESS;
 
      // Retrieve the input container:
      for (const std::string& key : keys) {
        const xAOD::EventFormat* input = nullptr;
        if (!m_inputMetaStore->retrieve(input, key).isSuccess()) {
          ATH_MSG_DEBUG("Failed to retrieve \"" << key << "\" from InputMetaDataStore");
          continue;  // try next key
        }
 
        // get output object
        auto output = m_outputMetaStore->tryRetrieve<xAOD::EventFormat>(key);
        if (!output) {
          auto ef = std::make_unique<xAOD::EventFormat>();
          output = ef.get();
          if (!m_outputMetaStore->record(std::move(ef), key).isSuccess()) {
            ATH_MSG_DEBUG("Failed to create output object \""
                          << key << "\" in MetaDataSvc");
            continue;
          }
        }
 
        ATH_MSG_VERBOSE("Merging of " << key);
        // Merge the new object into the output one:
        for (const auto& pair : *input) {
          if (!output->exists(pair.second.hash())) {
            output->add(pair.second);
          }
        }
      }
 
      // Return gracefully:
      return StatusCode::SUCCESS;
    }
 
}  // namespace xAODMaker