Throttling BuySide Sample

This sample demonstrates the throttling of outgoing messages on the initiator's side.

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Source code:

• Listener.h
• Listener.cpp
• ThrottlingBuySide.cpp

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Listener.h:

#include <OnixS/FIXEngine.h>

class Listener : public OnixS::FIX::ISessionListener
{
public:
    Listener() :orderHandlingComplete_(0), totalOrdersHandled_(0), totalMessagesRejected_(0) {}

    /// Is called when the application-level message is received from the counterparty.
    void onInboundApplicationMsg(Message & msg, Session * sn) ONIXS_FIXENGINE_FINAL;

    /// Is called when the session-level message is received from the counterparty.
    void onInboundSessionMsg(Message & msg, Session * sn) ONIXS_FIXENGINE_FINAL;

    void onStateChange(SessionState::Enum newState, SessionState::Enum prevState, Session * sn) ONIXS_FIXENGINE_FINAL;

    void onError(ErrorReason::Enum reason, const std::string & description, Session * sn) ONIXS_FIXENGINE_FINAL;
    void onWarning(WarningReason::Enum reason, const std::string & description, Session * sn) ONIXS_FIXENGINE_FINAL;

    OnixS::Threading::Semaphore orderHandlingComplete_;
    size_t totalOrdersHandled_;
    size_t totalMessagesRejected_;
};

Listener.cpp:

#include "Listener.h"

void Listener::onInboundApplicationMsg(Message & msg, Session * /*sn*/)
{
    std::clog << "\nIncoming application-level message:\n" << msg << std::endl;

    if(msg.type() == MsgType::Execution_Report)
    {
        ++totalOrdersHandled_;
        orderHandlingComplete_.release();
    }
}

void Listener::onInboundSessionMsg(Message & msg, Session * /*sn*/)
{
    std::clog << "\nIncoming session-level message:\n" << msg << std::endl;

    if(msg.type() == MsgType::Reject)
    {
        ++totalMessagesRejected_;
        std::clog << "Rejection " << totalMessagesRejected_ << ": message " << msg.get(Tags::RefSeqNum).toString() << " rejected." << std::endl;
        orderHandlingComplete_.release();
    }
}

void Listener::onStateChange(SessionState::Enum newState, SessionState::Enum prevState,
                             Session * /*sn*/)
{
    std::clog
            << "\nSession's state is changed, prevState="
            << SessionState::toString(prevState)
            << ", newState="
            << SessionState::toString(newState)
            << std::endl;
}

void Listener::onError(ErrorReason::Enum /*reason*/, const std::string & description, Session * /*sn*/)
{
    std::cerr << "\nSession-level error:" << description << std::endl;
}

void Listener::onWarning(WarningReason::Enum /*reason*/, const std::string & description,
                         Session * /*sn*/)
{
    std::cerr << "\nSession-level warning:" << description << std::endl;
}

ThrottlingBuySide.cpp:

#include "Listener.h"

#include "../../Common/Helpers.h"
#include "../../Common/Settings.h"

using namespace Settings;

int main()
{
    std::clog << "ThrottlingBuySide sample." << std::endl << std::endl;

    try
    {
        EngineSettings settings;
        settings.licenseStore(LicenseStore);
        Engine::init(settings);

        Listener listener;
        Session session(SenderCompId, TargetCompId, FixProtocolVersion, &listener);

        const std::string CounterpartyHost = "localhost";
        const int CounterpartyPort = ListenPort;
        const int HeartBtInt = 5;

        const size_t MessagesPerSecondLimitDelta = 3;
        const size_t MessagesPerSecondLimit = 10 - MessagesPerSecondLimitDelta;
        const size_t ThrottlingIntervalMillisecond = 1000;

        session.throttlingLimit(MessagesPerSecondLimit, ThrottlingIntervalMillisecond);

        session.logonAsInitiator(CounterpartyHost, CounterpartyPort, HeartBtInt);

        std::clog << "Press any key to send throttled orders..." << std::endl;

        waitUntilEnterKey();

        Message order(MsgType::Order_Single, FixProtocolVersion);
        setOrderFields(&order);

        const int NumOfMessages = 100;

        for(int msgCounter = 0; msgCounter < NumOfMessages; ++msgCounter)
        {
            session.throttle();
            session.send(&order);
            listener.orderHandlingComplete_.acquire();
        }

        std::clog << "Orders handled: " << listener.totalOrdersHandled_ << ", messages rejected: " << listener.totalMessagesRejected_ << std::endl;
        std::clog << "Press any key to disconnect the session and terminate the application." << std::endl;

        waitUntilEnterKey();

        session.logout("The session is disconnected by ThrottlingBuySide").shutdown();

        Engine::shutdown();
    }
    catch(const std::exception & ex)
    {
        processSampleException(ex.what());
        return 1;
    }

    return 0;
}