serviceContainer.hpp

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#ifndef RTCTK_COMPONENTFRAMEWORK_SERVICECONTAINER_HPP
#define RTCTK_COMPONENTFRAMEWORK_SERVICECONTAINER_HPP
 
#include <rtctk/componentFramework/exceptions.hpp>
 
#include <any>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
 
namespace rtctk::componentFramework {
 
class ServiceContainer {
public:
    template <typename Service>
    void Add(Service&& service, const std::string& name = "") {
        std::string key = CalcMapKey(typeid(Service), name);
        if (MapContains(key)) {
            CII_THROW(RtctkException, "service '" + key + "' already registered");
        }
        m_services.emplace(key, std::make_pair(std::forward<Service>(service), false));
    }
 
    template <typename Service>
    void Add(std::shared_ptr<Service> service, const std::string& name = "") {
        std::string key = CalcMapKey(typeid(Service), name);
        if (MapContains(key)) {
            CII_THROW(RtctkException, "service '" + key + "' already registered");
        }
        m_services.emplace(key, std::make_pair(service, true));
    }
 
    template <typename Service>
    Service& Get(const std::string& name = "") {
        std::string key = CalcMapKey(typeid(Service), name);
        if (not MapContains(key)) {
            CII_THROW(RtctkException, "service '" + key + "' not registered");
        }
        if (ServiceIsHeldByPointer(key)) {
            return *std::any_cast<std::shared_ptr<Service>>(m_services[key].first);
        } else {
            return std::any_cast<Service&>(m_services[key].first);
        }
    }
 
    template <typename Service>
    bool Contains(const std::string& name = "") {
        return MapContains(CalcMapKey(typeid(Service), name));
    }
 
    std::vector<std::string> List();
 
private:
    std::string CalcMapKey(const std::type_info& tid, const std::string& name);
 
    bool MapContains(const std::string& key);
    bool ServiceIsHeldByPointer(const std::string& key);
 
    // string:key, any:service, bool:true if services is held by a pointer
    std::map<std::string, std::pair<std::any, bool>> m_services;
};
 
}  // namespace rtctk::componentFramework
 
#endif