To get understanding in which state the Handler currently is, it's necessary to implement OnixS::CME::DropCopy::HandlerStateChangeListener class interface and associate an instance with the Handler using OnixS::CME::DropCopy::Handler::registerHandlerStateChangeListener member.
Below table describes all possible states for the Handler:
| State | Description |
| OnixS::CME::DropCopy::HandlerStates::Stopped | Handler is stopped or was not executed yet. |
| OnixS::CME::DropCopy::HandlerStates::Started | Handler is started. |
