{

public:

DataSender(ServiceRegistryRef registry);

void send(fair::mq::Parts&, ChannelIndex index);

std::unique_ptr<fair::mq::Message> create(RouteIndex index);

/// Reset the datasender to a clean state

/// so that we can track what whill be sent in the next

/// iteration and eventually complain if one of the

/// Lifetime::Timeframe is not create / sent.

void reset();

/// Actually verify if all the selected outputs have been sent.

/// Notice how I think there are a few cases in which we might

/// have a false positive, since I one could have a completion policy

/// which creates two required messages in two different iterations.

void verifyMissingSporadic() const;

private:

FairMQDeviceProxy& mProxy;

// We need the ServiceRegistry and not a ref, to be able

// to call the callbacks after sending.

ServiceRegistryRef mRegistry;

DeviceSpec const& mSpec;

std::vector<OutputSpec> mOutputs;

std::vector<size_t> mDistinctRoutesIndex;

std::vector<std::string> mMetricsNames;

std::vector<std::string> mVariablesMetricsNames;

std::vector<bool> mPresent;

std::vector<bool> mPresentDefaults;

O2_LOCKABLE_NAMED(std::recursive_mutex, mMutex, "data relayer mutex");