Following section depicts events fired by Handler while manipulating multicast feeds.

Working Threads Events

At run time Handler listen to different multicast sources to get market processed.

For each feed used by Handler, following events are fired by Handler instance:

Event	Description
OnixS::CME::MarketData::ThreadListener::onFeedJoin	Invoked when Handler started listening to market data on particular feed.
OnixS::CME::MarketData::ThreadListener::onFeedDrop	Invoked when Handler about to finish listening to market data on particular feed.

Each event identifies feed by its type (instrument, snapshot, incremental) and its role (primary (A), secondary (B)).

Note: Each event provides restricted access to underlying system resource (socket) allowing subscriber of event to perform optional resource tunning.

To get subscribed to threads events, it's necessary to register instance of OnixS::CME::MarketData::FeedListener class in particular Handler instance using OnixS::CME::MarketData::Handler::registerFeedListener member.