{

public:

/// \brief Constructor.

DataSamplingConditionCustom() : DataSamplingCondition(){};

/// \brief Default destructor

~DataSamplingConditionCustom() override = default;

/// \brief Instantiates and configures a custom condition based on configuration.

///

/// \param config - it should include 'moduleName', full 'className' with namespaces. Optionally it can contain

/// custom parameters for the loaded condition.

void configure(const boost::property_tree::ptree& config) override

{

std::string libraryName = "lib" + config.get<std::string>("moduleName");

std::string className = config.get<std::string>("className");

int libLoaded = gSystem->Load(libraryName.c_str(), "", true);

if (libLoaded < 0) {

throw std::runtime_error("Failed to load the library: " + libraryName);

}

// it does not seem to be documented anywhere, but this pointer to

// a dictionary should not be deleted - it results in segfaults.

TClass* dictionary = TClass::GetClass(className.c_str());

if (!dictionary) {

throw std::runtime_error("Failed to load the dictionary of the class: " + className + " from the library: " + libraryName);

}

mCondition.reset(static_cast<DataSamplingCondition*>(dictionary->New()));

if (mCondition == nullptr) {

throw std::runtime_error("Failed to instantiate the class: " + className + " from the library: " + libraryName);

}

mCondition->configure(config);

}

/// \brief Invokes decide() of a custom condition

bool decide(const o2::framework::DataRef& dataRef) override

{

return mCondition->decide(dataRef);

}

private:

std::unique_ptr<DataSamplingCondition> mCondition;