Explaining code of loopbacklinkprovider.cpp

loopbacklinkprovider.cpp

LoopbackLinkProvider::LoopbackLinkProvider()
    : identityPacket(PACKET_TYPE_IDENTITY)
{
    NetworkPacket::createIdentityPacket(&identityPacket);
}

This constructor builds an identity packet of the given type.

LoopbackLinkProvider::~LoopbackLinkProvider()
{
}

This implements the loopback link provider interface.

void LoopbackLinkProvider::onNetworkChange()
{
    LoopbackDeviceLink *newLoopbackDeviceLink = new LoopbackDeviceLink(QStringLiteral("loopback"), this);
    Q_EMIT onConnectionReceived(identityPacket, newLoopbackDeviceLink);

    if (loopbackDeviceLink) {
        delete loopbackDeviceLink;
    }

    loopbackDeviceLink = newLoopbackDeviceLink;
}

This creates a loopback device link object and marks it for deletion. It removes the loopback device link object from the list of links.

void LoopbackLinkProvider::onStart()
{
    onNetworkChange();
}

This code is called when the LoopbackLinkProvider is starting. It is responsible for ensuring that the network state is updated.

void LoopbackLinkProvider::onStop()
{
    if (loopbackDeviceLink) {
        delete loopbackDeviceLink;
    }
}

This removes the loopback device link object upon stop.