TimeSlotCalibration.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
#ifndef DETECTOR_CALIB_TIMESLOTCALIB_H_
#define DETECTOR_CALIB_TIMESLOTCALIB_H_
 
 
#include "DetectorsCalibration/TimeSlot.h"
#include "DetectorsCalibration/TimeSlotMetaData.h"
#include "DetectorsBase/TFIDInfoHelper.h"
#include "DetectorsBase/GRPGeomHelper.h"
#include "CommonDataFormat/TFIDInfo.h"
#include <TFile.h>
#include <filesystem>
#include <deque>
#include <gsl/gsl>
#include <limits>
#include <type_traits>
#include <unistd.h>
 
namespace o2
{
namespace framework
{
class ProcessingContext;
}
namespace calibration
{
 
template <typename Container>
class TimeSlotCalibration
{
 public:
  using Slot = TimeSlot<Container>;
  using TFType = o2::calibration::TFType;
 
  static constexpr TFType INFINITE_TF = o2::calibration::INFINITE_TF;
 
  TimeSlotCalibration() = default;
  virtual ~TimeSlotCalibration() = default;
  float getMaxSlotsDelay() const { return mMaxSlotsDelay; }
  void setMaxSlotsDelay(float v) { mMaxSlotsDelay = v > 0. ? v : 0.; }
 
  TFType getSlotLength() const { return mSlotLength; }
  void setSlotLength(TFType v)
  {
    if (v == 0) {
      setFinalizeWhenReady();
    } else {
      mSlotLength = v;
    }
  }
 
  TFType getCheckIntervalInfiniteSlot() const { return mCheckIntervalInfiniteSlot; }
  void setCheckIntervalInfiniteSlot(TFType v) { mCheckIntervalInfiniteSlot = v; }
 
  TFType getCheckDeltaIntervalInfiniteSlot() const { return mCheckDeltaIntervalInfiniteSlot; }
  void setCheckDeltaIntervalInfiniteSlot(TFType v) { mCheckDeltaIntervalInfiniteSlot = v < 1 ? mCheckIntervalInfiniteSlot : v; } // if the delta is 0, we ignore it
 
  TFType getFirstTF() const { return mFirstTF; }
  void setFirstTF(TFType v) { mFirstTF = v; }
 
  void setSlotLengthInSeconds(int s) { mSlotLengthInSeconds = s > 0 ? s : 1; }
  void setSlotLengthInOrbits(int n) { mSlotLengthInOrbits = n > 0 ? n : 1; }
  void checkSlotLength()
  {
    if (mSlotLengthInSeconds > 0) {
      TFType ntf = mSlotLengthInSeconds / (o2::base::GRPGeomHelper::getNHBFPerTF() * o2::constants::lhc::LHCOrbitMUS * 1e-6);
      LOGP(info, "Redefining slot duration from {} s. to {} TFs", mSlotLengthInSeconds, ntf);
      setSlotLength(ntf);
      mSlotLengthInSeconds = 0;
    } else if (mSlotLengthInOrbits > 0) {
      TFType ntf = mSlotLengthInOrbits / o2::base::GRPGeomHelper::getNHBFPerTF();
      if (ntf < 1) {
        ntf = 1;
      }
      LOGP(info, "Redefining slot duration from {} orbits to {} TFs", mSlotLengthInOrbits, ntf);
      setSlotLength(ntf);
      mSlotLengthInOrbits = 0;
    }
    setStartOffsetFrac(mStartOffsetFrac); // set once more to account for eventual dependencies
    mStartOffsetTFs = TFType(mSlotLength * mStartOffsetFrac);
  }
 
  void setStartOffsetFrac(float f)
  {
    if (mUpdateAtTheEndOfRunOnly || mFinalizeWhenReady || mSlotLength == INFINITE_TF) { // offset makes no sense for run-wide objects
      if (f) {
        LOGP(info, "Start offset is not supported in the INFINITE_TF slot length or UpdateAtTheEndOfRunOnly or FinalizeWhenReady modes");
      }
      return;
    }
    if (f < 0.) {
      mStartOffsetFrac = 0.;
    } else if (f > 0.95) {
      mStartOffsetFrac = 0.95;
    } else {
      mStartOffsetFrac = f;
    }
    if (mStartOffsetFrac || f != mStartOffsetFrac) {
      LOGP(info, "Imposing offset of {:4.2} x nominal slot length", mStartOffsetFrac);
    }
  }
 
  void setFinalizeWhenReady()
  {
    mFinalizeWhenReady = true;
    setSlotLength(INFINITE_TF);
    mStartOffsetFrac = 0;
  }
 
  void setUpdateAtTheEndOfRunOnly() { mUpdateAtTheEndOfRunOnly = kTRUE; }
 
  int getNSlots() const { return mSlots.size(); }
  Slot& getSlotForTF(TFType tf);
  Slot& getSlot(int i) { return (Slot&)mSlots.at(i); }
  const Slot& getSlot(int i) const { return (Slot&)mSlots.at(i); }
  const Slot& getLastSlot() const { return (Slot&)mSlots.back(); }
  const Slot& getFirstSlot() const { return (Slot&)mSlots.front(); }
 
  template <typename... DATA>
  bool process(const DATA&... data);
  virtual void checkSlotsToFinalize(TFType tf = INFINITE_TF, int maxDelay = 0);
  virtual void finalizeOldestSlot();
 
  virtual void reset()
  { // reset to virgin state (need for start - stop - start)
    mSlots.clear();
    mLastClosedTF = 0;
    mFirstTF = 0;
    mMaxSeenTF = 0;
    mLastCheckedTFInfiniteSlot = 0;
    mWasCheckedInfiniteSlot = false;
    initOutput();
  }
 
  // Methods to be implemented by the derived user class
 
  // implement and call this method te reset the output slots once they are not needed
  virtual void initOutput() = 0;
  // process the time slot container and add results to the output
  virtual void finalizeSlot(Slot& slot) = 0;
  // create new time slot in the beginning or the end of the slots pool
  virtual Slot& emplaceNewSlot(bool front, TFType tstart, TFType tend) = 0;
  // check if the slot has enough data to be finalized
  virtual bool hasEnoughData(const Slot& slot) const = 0;
 
  virtual void print() const;
 
  const o2::dataformats::TFIDInfo& getCurrentTFInfo() const { return mCurrentTFInfo; }
  o2::dataformats::TFIDInfo& getCurrentTFInfo() { return mCurrentTFInfo; }
 
  // from  https://stackoverflow.com/questions/87372/check-if-a-class-has-a-member-function-of-a-given-signature
  // Primary template with a static assertion
  // for a meaningful error message
  // if it ever gets instantiated.
  // We could leave it undefined if we didn't care.
  template <typename, typename T>
  struct has_fill_method {
    static_assert(
      std::integral_constant<T, false>::value,
      "Second template parameter needs to be of function type.");
  };
 
  // specialization that does the checking
 
  template <typename C, typename Ret, typename... Args>
  struct has_fill_method<C, Ret(Args...)> {
   private:
    template <typename T>
    static constexpr auto check(T*)
      -> typename std::is_same<decltype(std::declval<T>().fill(std::declval<Args>()...)), Ret>::type; // attempt to call it and see if the return type is correct
    template <typename>
    static constexpr std::false_type check(...);
    typedef decltype(check<C>(nullptr)) type;
 
   public:
    static constexpr bool value = type::value;
  };
 
  // methods for saving/reading data in the of the run in case of insufficient statistics
  bool getSavedSlotAllowed() const { return mSavedSlotAllowed; }
  void setSavedSlotAllowed(bool v) { mSavedSlotAllowed = v; }
  std::string getSaveFilePath() const;
  const std::string& getSaveFileName() const { return mSaveFileName; }
  void setSaveFileName(const std::string& n) { mSaveFileName = n; }
  void setSaveDirectory(const std::string& n) { mSaveDirectory = n; }
  virtual bool updateSaveMetaData();
 
  // derived class using slot saving functionality must implement this method to write the
  // content of the slot, returning true on success
  virtual bool saveLastSlotData(TFile& fl)
  {
    LOG(fatal) << "This method must be implemented by derived class to write content of the slot to save";
    return false;
  }
  // derived class using slot saving functionality must implement this method to adopt the content of the
  // saved slot, returning true on success. Provided metadata should be used to judge if the saved data is useful.
  virtual bool adoptSavedData(const TimeSlotMetaData& metadata, TFile& fl)
  {
    LOG(fatal) << "This method must be implemented by derived class to adopt content of the saved slot";
    return false;
  }
  virtual bool loadSavedSlot();
  virtual bool saveLastSlot();
 
 protected:
  auto& getSlots() { return mSlots; }
  uint32_t getRunStartOrbit() const
  {
    long orb = long(mCurrentTFInfo.firstTForbit) - long(o2::base::GRPGeomHelper::getNHBFPerTF() * mCurrentTFInfo.tfCounter);
    static unsigned int threshold = 512 * o2::base::GRPGeomHelper::getNHBFPerTF();
    if (orb < 0) {
      // If we have a firstTForbit between 1 and 512 * tf len, we disable the warning for negative runStartOrbit permanently, since this is a SYNTHETIC run.
      static bool suppressRunStartWarning = false;
      if (!suppressRunStartWarning) {
        const auto* grpecs = o2::base::GRPGeomHelper::instance().getGRPECS();
        if (grpecs) {
          if (grpecs->getRunType() == o2::parameters::GRPECS::SYNTHETIC) {
            suppressRunStartWarning = true;
          }
        } else if (mCurrentTFInfo.firstTForbit < threshold && mCurrentTFInfo.firstTForbit > 0) {
          suppressRunStartWarning = true;
        }
      }
 
      if (!suppressRunStartWarning && mCurrentTFInfo.firstTForbit >= threshold) {
        LOGP(alarm, "Negative runStartOrbit = {} deduced from tfCounter={} and firstTForbit={}, enforcing runStartOrbit to 0", orb, mCurrentTFInfo.tfCounter, mCurrentTFInfo.firstTForbit);
      }
      orb = 0;
    }
    return uint32_t(orb);
  }
 
  TFType tf2SlotMin(TFType tf) const;
  std::deque<Slot> mSlots;
 
  o2::dataformats::TFIDInfo mCurrentTFInfo{};
  int mSlotLengthInSeconds = -1; // optionally provided slot length in seconds
  int mSlotLengthInOrbits = -1;  // optionally provided slot length in orbits
  TFType mLastClosedTF = 0;
  TFType mFirstTF = 0;
  TFType mMaxSeenTF = 0;                        // largest TF processed
  TFType mSlotLength = 1;                       // slot length in TFs
  TFType mStartOffsetTFs = 0;                   // shift start of all TFs backwards by this amount (to make 1st slot effectively shorter: run_1st_tf to run_1st_tf - offset + mSlotLength), derived from mStartOffsetFrac
  float mStartOffsetFrac = 0.;                  // shift start of all TFs backwards mSlotLength*mStartOffsetFrac TFs.
  TFType mCheckIntervalInfiniteSlot = 1;        // will be used if the TF length is INFINITE_TF_int64 to decide
                                                // when to check if to call the finalize; otherwise it is called
                                                // at every new TF; note that this is an approximation,
                                                // since TFs come in async order
  TFType mLastCheckedTFInfiniteSlot = 0;        // will be used if the TF length is INFINITE_TF_int64 to book-keep
                                                // the last TF at which we tried to calibrate
  TFType mCheckDeltaIntervalInfiniteSlot = 1;   // will be used if the TF length is INFINITE_TF_int64 when
                                                // the check on the statistics returned false, to determine
                                                // after how many TF to check again.
  float mMaxSlotsDelay = 3.0;                   // difference in slot units between the current TF and oldest slot (end TF) to account for the TF
 
  bool mWasCheckedInfiniteSlot = false;         // flag to know whether the statistics of the infinite slot was already checked
  bool mUpdateAtTheEndOfRunOnly = false;
  bool mFinalizeWhenReady = false; // if true: single bin is filled until ready, then closed and new one is added
 
  std::string mSaveDirectory = ""; // directory where the file is saved
  std::string mSaveFileName = "";  // filename for data saves in the end of the run
  TimeSlotMetaData mSaveMetaData{};
  bool mSavedSlotAllowed = false;
 
  ClassDef(TimeSlotCalibration, 1);
};
 
//_________________________________________________
template <typename Container>
template <typename... DATA>
bool TimeSlotCalibration<Container>::process(const DATA&... data)
{
  static bool firstCall = true;
  if (firstCall) {
    firstCall = false;
    checkSlotLength();
  }
 
  // process current TF
  TFType tf = mCurrentTFInfo.tfCounter;
  uint64_t maxDelay64 = uint64_t(mSlotLength * mMaxSlotsDelay);
  TFType maxDelay = maxDelay64 > o2::calibration::INFINITE_TF ? o2::calibration::INFINITE_TF : TFType(maxDelay64);
  if (!mUpdateAtTheEndOfRunOnly) {                                                               // if you update at the end of run only, then you accept everything
    if (tf < mLastClosedTF || (!mSlots.empty() && getLastSlot().getTFStart() > tf + maxDelay64)) { // ignore TF; note that if you have only 1 timeslot
                                                                                                   // which is INFINITE_TF wide, then maxDelay
                                                                                                   // does not matter: you won't accept TFs from the past,
                                                                                                   // so the first condition will be used
      LOG(info) << "Ignoring TF " << tf << ", mLastClosedTF = " << mLastClosedTF;
      return false;
    }
  }
  auto& slotTF = getSlotForTF(tf);
  using Cont_t = typename std::remove_pointer<decltype(slotTF.getContainer())>::type;
  if constexpr (has_fill_method<Cont_t, void(const o2::dataformats::TFIDInfo&, const DATA&...)>::value) {
    slotTF.getContainer()->fill(mCurrentTFInfo, data...);
  } else {
    slotTF.getContainer()->fill(data...);
  }
  if (tf > mMaxSeenTF) {
    mMaxSeenTF = tf; // keep track of the most recent TF processed
  }
  if (!mUpdateAtTheEndOfRunOnly) { // if you update at the end of run only, you don't check at every TF which slots can be closed
    // check if some slots are done
    checkSlotsToFinalize(tf, maxDelay);
  }
 
  return true;
}
 
//_________________________________________________
template <typename Container>
void TimeSlotCalibration<Container>::checkSlotsToFinalize(TFType tf, int maxDelay)
{
  // Check which slots can be finalized, provided the newly arrived TF is tf
 
  // if slot finalization is asked as soon as the slot is ready, we need to check if we got enough statistics, and if so, redefine the slot
  if (mSlots.size() == 1 && mFinalizeWhenReady) {
    TFType checkInterval = mCheckIntervalInfiniteSlot + mLastCheckedTFInfiniteSlot;
    if (mWasCheckedInfiniteSlot) {
      checkInterval = mCheckDeltaIntervalInfiniteSlot + mLastCheckedTFInfiniteSlot;
    }
    if (tf >= checkInterval || tf == INFINITE_TF) {
      LOG(debug) << "mMaxSeenTF = " << mMaxSeenTF << ", mLastCheckedTFInfiniteSlot = " << mLastCheckedTFInfiniteSlot << ", checkInterval = " << checkInterval << ", mSlots[0].getTFStart() = " << mSlots[0].getTFStart();
      if (tf == INFINITE_TF) {
        LOG(info) << "End of run reached, trying to calibrate what we have, if we have enough statistics";
      } else {
        LOG(info) << "Calibrating as soon as we have enough statistics:";
        LOG(info) << "Update interval passed (" << checkInterval << "), checking slot for " << mSlots[0].getTFStart() << " <= TF <= " << INFINITE_TF;
      }
      mLastCheckedTFInfiniteSlot = tf;
      if (hasEnoughData(mSlots[0])) {
        mWasCheckedInfiniteSlot = false;
        mSlots[0].setTFStart(mLastClosedTF);
        mSlots[0].setTFEnd(mMaxSeenTF);
        LOG(info) << "Finalizing slot for " << mSlots[0].getTFStart() << " <= TF <= " << mSlots[0].getTFEnd();
        finalizeSlot(mSlots[0]);                  // will be removed after finalization
        mLastClosedTF = mSlots[0].getTFEnd() < INFINITE_TF ? (mSlots[0].getTFEnd() + 1) : mSlots[0].getTFEnd() < INFINITE_TF; // will not accept any TF below this
        mSlots.erase(mSlots.begin());
        // creating a new slot if we are not at the end of run
        if (tf != INFINITE_TF) {
          LOG(info) << "Creating new slot for " << mLastClosedTF << " <= TF <= " << INFINITE_TF;
          auto& sl = emplaceNewSlot(true, mLastClosedTF, INFINITE_TF);
          sl.setRunStartOrbit(getRunStartOrbit());
        }
      } else {
        LOG(info) << "Not enough data to calibrate";
        mWasCheckedInfiniteSlot = true;
      }
    } else {
      LOG(debug) << "Not trying to calibrate: either not at EoS, or update interval not passed";
    }
  } else {
    // check if some slots are done
    for (auto slot = mSlots.begin(); slot != mSlots.end();) {
      uint64_t lim64 = uint64_t(maxDelay) + slot->getTFEnd();
      TFType tfLim = lim64 < INFINITE_TF ? TFType(lim64) : INFINITE_TF;
      if (tfLim < tf) {
        if (hasEnoughData(*slot)) {
          LOG(debug) << "Finalizing slot for " << slot->getTFStart() << " <= TF <= " << slot->getTFEnd();
          finalizeSlot(*slot); // will be removed after finalization
        } else if ((slot + 1) != mSlots.end()) {
          LOG(info) << "Merging underpopulated slot " << slot->getTFStart() << " <= TF <= " << slot->getTFEnd()
                    << " to slot " << (slot + 1)->getTFStart() << " <= TF <= " << (slot + 1)->getTFEnd();
          (slot + 1)->mergeToPrevious(*slot);
        } else {
          LOG(info) << "Discard underpopulated slot " << slot->getTFStart() << " <= TF <= " << slot->getTFEnd();
          break; // slot has no enough stat. and there is no other slot to merge it to
        }
        mLastClosedTF = slot->getTFEnd() + 1; // will not accept any TF below this
        LOG(info) << "closing slot " << slot->getTFStart() << " <= TF <= " << slot->getTFEnd();
        slot = mSlots.erase(slot);
      } else {
        break; // all following slots will be even closer to the new TF
      }
    }
  }
}
 
//_________________________________________________
template <typename Container>
void TimeSlotCalibration<Container>::finalizeOldestSlot()
{
  // Enforce finalization and removal of the oldest slot
  if (mSlots.empty()) {
    LOG(warning) << "There are no slots defined";
    return;
  }
  finalizeSlot(mSlots.front());
  mLastClosedTF = mSlots.front().getTFEnd() + 1; // do not accept any TF below this
  mSlots.erase(mSlots.begin());
}
 
//________________________________________
template <typename Container>
inline TFType TimeSlotCalibration<Container>::tf2SlotMin(TFType tf) const
{
  // returns the min TF of the slot to which "tf" belongs
  if (tf < mFirstTF) {
    throw std::runtime_error("invalid TF");
  }
  if (mUpdateAtTheEndOfRunOnly) {
    return mFirstTF;
  }
  int64_t tft = 0;
  tft = int64_t(((tf - mFirstTF + mStartOffsetTFs) / mSlotLength) * mSlotLength) + mFirstTF;
  if (tft > mStartOffsetTFs) {
    tft -= mStartOffsetTFs;
  } else {
    tft = 0;
  }
  return tft < o2::calibration::INFINITE_TF ? TFType(tft) : INFINITE_TF;
}
 
//_________________________________________________
template <typename Container>
TimeSlot<Container>& TimeSlotCalibration<Container>::getSlotForTF(TFType tf)
{
 
  LOG(debug) << "Getting slot for TF " << tf;
  if (mUpdateAtTheEndOfRunOnly) {
    if (!mSlots.empty() && mSlots.back().getTFEnd() < tf) {
      mSlots.back().setTFEnd(tf);
    } else if (mSlots.empty()) {
      auto& sl = emplaceNewSlot(true, mFirstTF, tf);
      sl.setRunStartOrbit(getRunStartOrbit());
      sl.setStaticStartTimeMS(sl.getStartTimeMS());
    }
    return mSlots.back();
  }
 
  if (!mSlots.empty() && mSlots.front().getTFStart() > tf) { // we need to add a slot to the beginning
    auto tfmn = tf2SlotMin(mSlots.front().getTFStart() - 1); // min TF of the slot corresponding to a TF smaller than the first seen
    auto tftgt = tf2SlotMin(tf);                             // min TF of the slot to which the TF "tf" would belong
    while (tfmn >= tftgt) {
      uint64_t tft = mSlots.front().getTFStart() - 1;
      TFType tfmx = tft < o2::calibration::INFINITE_TF ? TFType(tft) : o2::calibration::INFINITE_TF;
      LOG(info) << "Adding new slot for " << tfmn << " <= TF <= " << tfmx;
      auto& sl = emplaceNewSlot(true, tfmn, tfmx);
      sl.setRunStartOrbit(getRunStartOrbit());
      sl.setStaticStartTimeMS(sl.getStartTimeMS());
      if (!tfmn) {
        break;
      }
      tfmn = tf2SlotMin(mSlots.front().getTFStart() - 1);
    }
    return mSlots[0];
  }
  for (auto it = mSlots.begin(); it != mSlots.end(); it++) {
    auto rel = (*it).relateToTF(tf);
    if (rel == 0) {
      return (*it);
    }
  }
  // need to add in the end
  auto tfmn = mSlots.empty() ? tf2SlotMin(tf) : tf2SlotMin(mSlots.back().getTFEnd() + 1);
  do {
    uint64_t tft = uint64_t(tfmn) + mSlotLength - 1;
    if (mSlots.empty() && mStartOffsetTFs && tf < mStartOffsetTFs) { // if this was lowest possible TF, its length might be smaller than mSlotLength
      tft -= mStartOffsetTFs;
    }
    TFType tfmx = tft < o2::calibration::INFINITE_TF ? TFType(tft) : o2::calibration::INFINITE_TF;
    LOG(info) << "Adding new slot for " << tfmn << " <= TF <= " << tfmx;
    auto& sl = emplaceNewSlot(false, tfmn, tfmx);
    sl.setRunStartOrbit(getRunStartOrbit());
    sl.setStaticStartTimeMS(sl.getStartTimeMS());
    tfmn = tft < o2::calibration::INFINITE_TF ? mSlots.back().getTFEnd() + 1 : tft;
  } while (tf > mSlots.back().getTFEnd());
 
  return mSlots.back();
}
 
//_________________________________________________
template <typename Container>
void TimeSlotCalibration<Container>::print() const
{
  for (int i = 0; i < getNSlots(); i++) {
    LOG(info) << "Slot #" << i + 1 << " of " << getNSlots();
    getSlot(i).print();
  }
}
 
//_________________________________________________
template <typename Container>
bool TimeSlotCalibration<Container>::updateSaveMetaData()
{
  if (mSlots.empty()) {
    LOG(warn) << "Nothing to save, no TimeSlots defined";
    return false;
  }
  if (mSaveMetaData.startRun < 0) {
    mSaveMetaData.startRun = mCurrentTFInfo.runNumber;
  }
  mSaveMetaData.endRun = mCurrentTFInfo.runNumber;
  if (mSaveMetaData.startTime < 0) {
    mSaveMetaData.startTime = mSlots.back().getStartTimeMS();
  }
  mSaveMetaData.endTime = mSlots.back().getEndTimeMS();
  return true;
}
 
//_________________________________________________
template <typename Container>
bool TimeSlotCalibration<Container>::saveLastSlot()
{
  if (!getSavedSlotAllowed()) {
    LOG(info) << "Slot saving is disabled";
    return false;
  }
  if (!updateSaveMetaData()) {
    return false;
  }
 
  if (!mSaveDirectory.empty() && !std::filesystem::exists(mSaveDirectory)) {
    std::filesystem::create_directories(mSaveDirectory);
    if (!std::filesystem::exists(mSaveDirectory)) {
      LOGP(fatal, "could not create output directory {}", mSaveDirectory);
    } else {
      LOGP(info, "created calibration directory {}", mSaveDirectory);
    }
  }
 
  auto pth = getSaveFilePath();
  auto pthTmp = pth + ".part";
  TFile flout(pthTmp.c_str(), "recreate");
  if (flout.IsZombie()) {
    LOGP(error, "failed to open save file {}", pth);
    unlink(pthTmp.c_str());
    return false;
  }
  if (!saveLastSlotData(flout)) { // call used method to store data
    flout.Close();
    unlink(pthTmp.c_str());
    return false;
  }
  flout.WriteObjectAny(&mSaveMetaData, "o2::calibration::TimeSlotMetaData", "metadata");
  flout.Close();
  std::filesystem::rename(pthTmp, pth);
  LOGP(info, "Saved data of the last slot to {}", pth);
  return true;
}
 
//_________________________________________________
template <typename Container>
bool TimeSlotCalibration<Container>::loadSavedSlot()
{
  if (!getSavedSlotAllowed()) {
    LOG(info) << "Saved slot usage is disabled";
    return false;
  }
  auto pth = getSaveFilePath();
  if (!std::filesystem::exists(pth)) {
    LOGP(info, "No save file {} is found", pth);
    return false;
  }
  TFile flin(pth.c_str());
  if (flin.IsZombie()) {
    LOGP(error, "failed to open save file {}", pth);
    return false;
  }
  auto meta = (o2::calibration::TimeSlotMetaData*)flin.GetObjectChecked("metadata", "o2::calibration::TimeSlotMetaData");
  if (!meta) {
    LOGP(error, "Failed to read metadata from {}", pth);
    return false;
  }
  auto res = adoptSavedData(*meta, flin); // up to the detector to decide if data should be accepted
  if (res) {
    mSaveMetaData.startRun = meta->startRun;
    mSaveMetaData.startTime = meta->startTime;
    updateSaveMetaData();
  }
  flin.Close();
  unlink(pth.c_str()); // cleanup used file
  return true;
}
 
//_________________________________________________
template <typename Container>
std::string TimeSlotCalibration<Container>::getSaveFilePath() const
{
  if (mSaveFileName.empty()) {
    LOGP(fatal, "Save file name was not set");
  }
  return fmt::format("{}{}{}", mSaveDirectory, ((!mSaveDirectory.empty() && mSaveDirectory.back() != '/') ? "/" : ""), mSaveFileName);
}
 
} // namespace calibration
} // namespace o2
 
#endif