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#ifndef CommonTools_Utils_MethodChain_h
#define CommonTools_Utils_MethodChain_h
/* \class reco::parser::MethodChain
*
* Chain of methods
* Based on ExpressionBase and ExpressionVar, but remove final conversion to double
*
*/
#include "CommonTools/Utils/interface/parser/MethodInvoker.h"
#include "CommonTools/Utils/interface/TypeCode.h"
#include <vector>
#include <oneapi/tbb/concurrent_queue.h>
namespace reco {
namespace parser {
/// Based on Expression, but its value method returns an edm::ObjectWithDict instead of a double
class MethodChainBase {
public: // Public Methods
virtual ~MethodChainBase() {}
virtual edm::ObjectWithDict value(const edm::ObjectWithDict&) const = 0;
};
/// Shared ptr to MethodChainBase
typedef std::shared_ptr<MethodChainBase> MethodChainPtr;
/// Evaluate an object's method or datamember (or chain of them)
class MethodChain : public MethodChainBase {
private: // Private Data Members
std::vector<MethodInvoker> methods_;
using Objects = std::vector<std::pair<edm::ObjectWithDict, bool>>;
mutable oneapi::tbb::concurrent_queue<Objects> objectsCache_;
private: // Private Methods
[[nodiscard]] Objects initObjects_() const;
Objects borrowObjects() const;
void returnObjects(Objects&&) const;
public: // Public Static Methods
/// allocate an object to hold the result of a given member (if needed)
/// this method is used also from the LazyInvoker code
/// returns true if objects returned from this will require a destructor
static bool makeStorage(edm::ObjectWithDict& obj, const edm::TypeWithDict& retType);
/// delete an objecty, if needed
/// this method is used also from the LazyInvoker code
static void delStorage(edm::ObjectWithDict&);
public: // Public Methods
MethodChain(const std::vector<MethodInvoker>& methods);
MethodChain(const MethodChain&);
~MethodChain();
edm::ObjectWithDict value(const edm::ObjectWithDict&) const override;
};
/// Same as MethodChain but with lazy resolution of object methods
/// using the dynamic type of the object, and not the one fixed at compile time
class LazyMethodChain : public MethodChainBase {
private: // Private Data Members
std::vector<LazyInvoker> methods_;
public:
LazyMethodChain(const std::vector<LazyInvoker>& methods);
~LazyMethodChain() override;
edm::ObjectWithDict value(const edm::ObjectWithDict&) const override;
};
} // namespace parser
} // namespace reco
#endif // CommonTools_Utils_MethodChain_h
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