19.1.4.2. DataReaderListener

class fastdds.DataReaderListener

Class DataReaderListener, it should be used by the end user to implement specific callbacks to certain actions.

on_data_available(reader)

Virtual function to be implemented by the user containing the actions to be performed when new Data Messages are received.

Parameters

reader (DataReader) – DataReader

on_liveliness_changed(reader, status)

Method called when the liveliness status associated to a subscriber changes

Parameters

  • reader (DataReader) – The DataReader

  • status (eprosima::fastrtps::LivelinessChangedStatus) – The liveliness changed status

on_requested_deadline_missed(reader, status)

Virtual method to be called when a topic misses the deadline period

Parameters

  • reader (DataReader) – DataReader

  • status (eprosima::fastrtps::RequestedDeadlineMissedStatus) – The requested deadline missed status

on_requested_incompatible_qos(reader, status)

Method called an incompatible QoS was requested.

Parameters

  • reader (DataReader) – The DataReader

  • status (RequestedIncompatibleQosStatus) – The requested incompatible QoS status

on_sample_lost(reader, status)

Method called when a sample was lost.

Parameters

  • reader (DataReader) – The DataReader

  • status (SampleLostStatus) – The sample lost status

on_sample_rejected(reader, status)

Method called when a sample was rejected.

Parameters

  • reader (DataReader) – The DataReader

  • status (eprosima::fastrtps::SampleRejectedStatus) – The rejected status

on_subscription_matched(reader, info)

Virtual method to be called when the subscriber is matched with a new Writer (or unmatched); i.e., when a writer publishing in the same topic is discovered.

Parameters
property thisown

The membership flag