LayerHitMapCache.h

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#ifndef LayerHitMapCache_H
#define LayerHitMapCache_H

#include "RecoTracker/TkTrackingRegions/interface/TrackingRegion.h"
#include "RecoTracker/TkHitPairs/interface/RecHitsSortedInPhi.h"
#include "TrackingTools/TransientTrackingRecHit/interface/SeedingLayerSetsHits.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "DataFormats/TrackingRecHit/interface/mayown_ptr.h"

class LayerHitMapCache {
private:
  class SimpleCache {
  public:
    using ValueType = RecHitsSortedInPhi;
    using KeyType = int;
    SimpleCache(unsigned int initSize) : theContainer(initSize) {}
    SimpleCache(const SimpleCache&) = delete;
    SimpleCache& operator=(const SimpleCache&) = delete;
    SimpleCache(SimpleCache&&) = default;
    SimpleCache& operator=(SimpleCache&&) = default;
    ~SimpleCache() { clear(); }
    void resize(int size) { theContainer.resize(size); }
    const ValueType* get(KeyType key) const { return theContainer[key].get(); }
    void add(KeyType key, ValueType* value) {
      if (key >= int(theContainer.size()))
        resize(key + 1);
      theContainer[key].reset(value);
    }
    void extend(const SimpleCache& other) {
      // N.B. Here we assume that the lifetime of 'other' is longer than of 'this'.
      if (other.theContainer.size() > theContainer.size())
        resize(other.theContainer.size());

      for (size_t i = 0, size = other.theContainer.size(); i != size; ++i) {
        assert(get(i) == nullptr);  // We don't want to override any existing value
        auto v = other.get(i);
        if (v) {
          // pass by reference to denote that we don't own it
          theContainer[i].reset(*(other.get(i)));
        } else {
          theContainer[i].reset();
        }
      }
    }
    void clear() {
      for (auto& v : theContainer) {
        v.reset();
      }
    }

  private:
    std::vector<mayown_ptr<ValueType> > theContainer;
  };

private:
  typedef SimpleCache Cache;

public:
  LayerHitMapCache(unsigned int initSize = 50) : theCache(initSize) {}
  LayerHitMapCache(LayerHitMapCache&&) = default;
  LayerHitMapCache& operator=(LayerHitMapCache&&) = default;

  void clear() { theCache.clear(); }

  void extend(const LayerHitMapCache& other) { theCache.extend(other.theCache); }

  // Mainly for FastSim, overrides old hits if exists
  RecHitsSortedInPhi* add(const SeedingLayerSetsHits::SeedingLayer& layer, std::unique_ptr<RecHitsSortedInPhi> hits) {
    RecHitsSortedInPhi* ptr = hits.get();
    theCache.add(layer.index(), hits.release());
    return ptr;
  }

  const RecHitsSortedInPhi& operator()(const SeedingLayerSetsHits::SeedingLayer& layer,
                                       const TrackingRegion& region,
                                       const edm::EventSetup& iSetup) {
    int key = layer.index();
    assert(key >= 0);
    const RecHitsSortedInPhi* lhm = theCache.get(key);
    if (lhm == nullptr) {
      auto tmp = add(
          layer, std::make_unique<RecHitsSortedInPhi>(region.hits(iSetup, layer), region.origin(), layer.detLayer()));
      tmp->theOrigin = region.origin();
      lhm = tmp;
      LogDebug("LayerHitMapCache") << " I got" << lhm->all().second - lhm->all().first
                                   << " hits in the cache for: " << layer.detLayer();
    } else {
      // std::cout << region.origin() << " " <<  lhm->theOrigin << std::endl;
      LogDebug("LayerHitMapCache") << " I got" << lhm->all().second - lhm->all().first
                                   << " hits FROM THE cache for: " << layer.detLayer();
    }
    return *lhm;
  }

private:
  Cache theCache;
};

#endif