RootEmbeddedFileSequence.cc

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/*----------------------------------------------------------------------
----------------------------------------------------------------------*/
#include "EmbeddedRootSource.h"
#include "InputFile.h"
#include "RootFile.h"
#include "RootEmbeddedFileSequence.h"
#include "RootTree.h"

#include "DataFormats/Provenance/interface/BranchID.h"
#include "DataFormats/Provenance/interface/BranchIDListHelper.h"
#include "DataFormats/Provenance/interface/ThinnedAssociationsHelper.h"
#include "FWCore/Catalog/interface/InputFileCatalog.h"
#include "FWCore/Catalog/interface/SiteLocalConfig.h"
#include "FWCore/Framework/interface/InputSource.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/ParameterSet/interface/ParameterSetDescription.h"
#include "FWCore/ServiceRegistry/interface/Service.h"

#include "CLHEP/Random/RandFlat.h"

#include <random>

namespace edm {
  class EventPrincipal;

  RootEmbeddedFileSequence::RootEmbeddedFileSequence(
                ParameterSet const& pset,
                EmbeddedRootSource& input,
                InputFileCatalog const& catalog) :
    RootInputFileSequence(pset, catalog),
    input_(input),
    orderedProcessHistoryIDs_(),
    sequential_(pset.getUntrackedParameter<bool>("sequential", false)),
    sameLumiBlock_(pset.getUntrackedParameter<bool>("sameLumiBlock", false)),
    fptr_(nullptr),
    eventsRemainingInFile_(0),
    // The default value provided as the second argument to the getUntrackedParameter function call
    // is not used when the ParameterSet has been validated and the parameters are not optional
    // in the description.  This is currently true when PoolSource is the primary input source.
    // The modules that use PoolSource as a SecSource have not defined their fillDescriptions function
    // yet, so the ParameterSet does not get validated yet.  As soon as all the modules with a SecSource
    // have defined descriptions, the defaults in the getUntrackedParameterSet function calls can
    // and should be deleted from the code.
    initialNumberOfEventsToSkip_(pset.getUntrackedParameter<unsigned int>("skipEvents", 0U)),
    enablePrefetching_(false) {

    if(noFiles()) {
      throw Exception(errors::Configuration) << "RootEmbeddedFileSequence no input files specified for secondary input source.\n";
    }
    //
    // The SiteLocalConfig controls the TTreeCache size and the prefetching settings.
    Service<SiteLocalConfig> pSLC;
    if(pSLC.isAvailable()) {
      enablePrefetching_ = pSLC->enablePrefetching();
    }

    // Set the pointer to the function that reads an event.
    if(sameLumiBlock_) {
      if(sequential_) {
        fptr_ = &RootEmbeddedFileSequence::readOneSequentialWithID;
      } else {
        fptr_ = &RootEmbeddedFileSequence::readOneRandomWithID;
      }
    } else {
      if(sequential_) {
        fptr_ = &RootEmbeddedFileSequence::readOneSequential;
      } else {
        fptr_ = &RootEmbeddedFileSequence::readOneRandom;
      }
    }

    // For the secondary input source we do not stage in.
    if(sequential_) {
      // We open the first file
      if(!atFirstFile()) {
        setAtFirstFile();
        initFile(false);
      }
      assert(rootFile());
      rootFile()->setAtEventEntry(IndexIntoFile::invalidEntry);
      if(!sameLumiBlock_) {
        skipEntries(initialNumberOfEventsToSkip_);
      }
    } else {
      // We randomly choose the first file to open.
      // We cannot use the random number service yet.
      std::ifstream f("/dev/urandom");
      unsigned int seed;
      f.read(reinterpret_cast<char*>(&seed), sizeof(seed)); 
      std::default_random_engine dre(seed);
      size_t count = numberOfFiles();
      std::uniform_int_distribution<int> distribution(0, count - 1);
      while(!rootFile() && count != 0) {
        --count;
        int offset = distribution(dre);
        setAtFileSequenceNumber(offset);
        initFile(input_.skipBadFiles());
      }
    }
    if(rootFile()) {
      input_.productRegistryUpdate().updateFromInput(rootFile()->productRegistry()->productList());
    }
  }

  RootEmbeddedFileSequence::~RootEmbeddedFileSequence() {
  }

  void
  RootEmbeddedFileSequence::endJob() {
    closeFile_();
  }

  void RootEmbeddedFileSequence::closeFile_() {
    // delete the RootFile object.
    if(rootFile()) {
      rootFile().reset();
    }
  }

  void RootEmbeddedFileSequence::initFile_(bool skipBadFiles) {
    initTheFile(skipBadFiles, false, nullptr, "mixingFiles", InputType::SecondarySource);
  }

  RootEmbeddedFileSequence::RootFileSharedPtr
  RootEmbeddedFileSequence::makeRootFile(std::shared_ptr<InputFile> filePtr) {
    size_t currentIndexIntoFile = sequenceNumberOfFile();
    return std::make_shared<RootFile>(
          fileName(),
          ProcessConfiguration(),
          logicalFileName(),
          filePtr,
      input_.nStreams(),
          input_.treeMaxVirtualSize(),
          input_.runHelper(),
          input_.productSelectorRules(),
          InputType::SecondarySource,
          input_.processHistoryRegistryForUpdate(),
          indexesIntoFiles(),
          currentIndexIntoFile,
          orderedProcessHistoryIDs_,
          input_.bypassVersionCheck(),
          enablePrefetching_);
  }

  void
  RootEmbeddedFileSequence::skipEntries(unsigned int offset) {
    // offset is decremented by the number of events actually skipped.
    bool completed = rootFile()->skipEntries(offset);
    while(!completed) {
      setAtNextFile();
      if(noMoreFiles()) {
        setAtFirstFile();
      }
      initFile(false);
      assert(rootFile());
      rootFile()->setAtEventEntry(IndexIntoFile::invalidEntry);
      completed = rootFile()->skipEntries(offset);
    }
  }

  bool
  RootEmbeddedFileSequence::readOneSequential(EventPrincipal& cache, size_t& fileNameHash, CLHEP::HepRandomEngine*, EventID const*) {
    assert(rootFile());
    rootFile()->nextEventEntry();
    bool found = rootFile()->readCurrentEvent(cache);
    if(!found) {
      setAtNextFile();
      if(noMoreFiles()) {
        setAtFirstFile();
      }
      initFile(false);
      assert(rootFile());
      rootFile()->setAtEventEntry(IndexIntoFile::invalidEntry);
      return readOneSequential(cache, fileNameHash, nullptr, nullptr);
    }
    fileNameHash = lfnHash();
    return true;
  }

  bool
  RootEmbeddedFileSequence::readOneSequentialWithID(EventPrincipal& cache, size_t& fileNameHash, CLHEP::HepRandomEngine*, EventID const* idp) {
    assert(idp);
    EventID const& id = *idp;
    int offset = initialNumberOfEventsToSkip_;
    initialNumberOfEventsToSkip_ = 0;
    if(offset > 0) {
      assert(rootFile());
      while(offset > 0) {
        bool found = readOneSequentialWithID(cache, fileNameHash, nullptr, idp);
        if(!found) {
          return false;
        }
        --offset;
      }
    }
    assert(rootFile());
    if(noMoreFiles() ||
        rootFile()->indexIntoFileIter().run() != id.run() ||
        rootFile()->indexIntoFileIter().lumi() != id.luminosityBlock()) {
      bool found = skipToItem(id.run(), id.luminosityBlock(), 0, 0, false);
      if(!found) {
        return false;
      }
    }
    assert(rootFile());
    bool found = rootFile()->setEntryAtNextEventInLumi(id.run(), id.luminosityBlock());
    if(found) {
      found = rootFile()->readCurrentEvent(cache);
    }
    if(!found) {
      found = skipToItemInNewFile(id.run(), id.luminosityBlock(), 0);
      if(!found) {
        return false;
      }
      return readOneSequentialWithID(cache, fileNameHash, nullptr, idp);
    }
    fileNameHash = lfnHash();
    return true;
  }

  void
  RootEmbeddedFileSequence::readOneSpecified(EventPrincipal& cache, size_t& fileNameHash, SecondaryEventIDAndFileInfo const& idx) {
    EventID const& id = idx.eventID();
    bool found = skipToItem(id.run(), id.luminosityBlock(), id.event(), idx.fileNameHash());
    if(!found) {
       throw Exception(errors::NotFound) <<
         "RootEmbeddedFileSequence::readOneSpecified(): Secondary Input files" <<
         " do not contain specified event:\n" << id << "\n";
    }
    assert(rootFile());
    found = rootFile()->readCurrentEvent(cache);
    assert(found);
    fileNameHash = idx.fileNameHash();
    if(fileNameHash == 0U)  {
      fileNameHash = lfnHash();
    }
  }

  bool
  RootEmbeddedFileSequence::readOneRandom(EventPrincipal& cache, size_t& fileNameHash, CLHEP::HepRandomEngine* engine, EventID const*) {
    assert(rootFile());
    assert(engine);
    unsigned int currentSeqNumber = sequenceNumberOfFile();
    while(eventsRemainingInFile_ == 0) {

      unsigned int newSeqNumber = CLHEP::RandFlat::shootInt(engine, fileCatalogItems().size());
      setAtFileSequenceNumber(newSeqNumber);
      if(newSeqNumber != currentSeqNumber) {
        initFile(false);
        currentSeqNumber = newSeqNumber;
      }
      eventsRemainingInFile_ = rootFile()->eventTree().entries();
      if(eventsRemainingInFile_ == 0) {
        throw Exception(errors::NotFound) <<
           "RootEmbeddedFileSequence::readOneRandom(): Secondary Input file " << fileName() << " contains no events.\n";
      }
      rootFile()->setAtEventEntry(CLHEP::RandFlat::shootInt(engine, eventsRemainingInFile_) - 1);
    }
    rootFile()->nextEventEntry();

    bool found = rootFile()->readCurrentEvent(cache);
    if(!found) {
      rootFile()->setAtEventEntry(0);
      bool found = rootFile()->readCurrentEvent(cache);
      assert(found);
    }
    fileNameHash = lfnHash();
    --eventsRemainingInFile_;
    return true;
  }

  bool
  RootEmbeddedFileSequence::readOneRandomWithID(EventPrincipal& cache, size_t& fileNameHash, CLHEP::HepRandomEngine* engine, EventID const* idp) {
    assert(engine);
    assert(idp);
    EventID const& id = *idp;
    if(noMoreFiles() || !rootFile() ||
        rootFile()->indexIntoFileIter().run() != id.run() ||
        rootFile()->indexIntoFileIter().lumi() != id.luminosityBlock()) {
      bool found = skipToItem(id.run(), id.luminosityBlock(), 0);
      if(!found) {
        return false;
      }
      int eventsInLumi = 0;
      assert(rootFile());
      while(rootFile()->setEntryAtNextEventInLumi(id.run(), id.luminosityBlock())) ++eventsInLumi;
      found = skipToItem(id.run(), id.luminosityBlock(), 0);
      assert(found);
      int eventInLumi = CLHEP::RandFlat::shootInt(engine, eventsInLumi);
      for(int i = 0; i < eventInLumi; ++i) {
        bool found = rootFile()->setEntryAtNextEventInLumi(id.run(), id.luminosityBlock());
        assert(found);
      }
    }
    assert(rootFile());
    bool found = rootFile()->setEntryAtNextEventInLumi(id.run(), id.luminosityBlock());
    if(found) {
      found = rootFile()->readCurrentEvent(cache);
    }
    if(!found) {
      bool found = rootFile()->setEntryAtItem(id.run(), id.luminosityBlock(), 0);
      if(!found) {
        return false;
      }
      return readOneRandomWithID(cache, fileNameHash, engine, idp);
    }
    fileNameHash = lfnHash();
    return true;
  }

  bool
  RootEmbeddedFileSequence::readOneEvent(EventPrincipal& cache, size_t& fileNameHash, CLHEP::HepRandomEngine* engine, EventID const* id) {
    assert(!sameLumiBlock_ || id != nullptr);
    assert(sequential_ || engine != nullptr);
    return (this->*fptr_)(cache, fileNameHash, engine, id);
  }

  void
  RootEmbeddedFileSequence::fillDescription(ParameterSetDescription & desc) {
    desc.addUntracked<bool>("sequential", false)
        ->setComment("True: loopEvents() reads events sequentially from beginning of first file.\n"
                     "False: loopEvents() first reads events beginning at random event. New files also chosen randomly");
    desc.addUntracked<bool>("sameLumiBlock", false)
        ->setComment("True: loopEvents() reads events only in same lumi as the specified event.\n"
                     "False: loopEvents() reads events regardless of lumi.");
    desc.addUntracked<unsigned int>("skipEvents", 0U)
        ->setComment("Skip the first 'skipEvents' events. Used only if 'sequential' is True and 'sameLumiBlock' is False");
  }
}