DeferredProductGetter.h

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#ifndef art_Framework_Principal_DeferredProductGetter_h
#define art_Framework_Principal_DeferredProductGetter_h

#include "art/Framework/Principal/fwd.h"
#include "art/Utilities/fwd.h"
#include "canvas/Persistency/Common/EDProductGetter.h"
#include "canvas/Persistency/Provenance/ProductID.h"
#include "cetlib/exempt_ptr.h"

class art::DeferredProductGetter : public EDProductGetter {
public:
  DeferredProductGetter(cet::exempt_ptr<Principal const> groupFinder,
                        ProductID pid);

  bool isReady() const override;
  EDProduct const* getIt() const override;
  EDProduct const* anyProduct() const override;
  EDProduct const* uniqueProduct() const override;
  EDProduct const* uniqueProduct(TypeID const&) const override;
  bool resolveProduct(TypeID const&) const override;
  bool resolveProductIfAvailable(TypeID const&) const override;

private:
  cet::exempt_ptr<EDProductGetter const> resolveGetter_() const;
  cet::exempt_ptr<EDProductGetter const> maybeResolveGetter_() const;

  cet::exempt_ptr<Principal const> groupFinder_;
  ProductID const pid_;
  mutable cet::exempt_ptr<EDProductGetter const> realGetter_;
}; // EDProductGetter

inline bool
art::DeferredProductGetter::isReady() const
{
  return (maybeResolveGetter_() != nullptr) && realGetter_->isReady();
}

#endif /* art_Framework_Principal_DeferredProductGetter_h */

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