Struct rmw_liveliness_changed_status_s

• Defined in File liveliness_changed.h

Struct Documentation

struct rmw_liveliness_changed_status_s

QoS Liveliness Changed information provided by a subscription.

Public Members

int32_t alive_count

The total number of currently active Publishers which publish to the topic associated with the Subscription. This count increases when a newly matched Publisher asserts its liveliness for the first time or when a Publisher previously considered to be not alive reasserts its liveliness. The count decreases when a Publisher considered alive fails to assert its liveliness and becomes not alive, whether because it was deleted normally or for some other reason.

int32_t not_alive_count

The total count of current Publishers which publish to the topic associated with the Subscription that are no longer asserting their liveliness. This count increases when a Publisher considered alive fails to assert its liveliness and becomes not alive for some reason other than the normal deletion of that Publisher. It decreases when a previously not alive Publisher either reasserts its liveliness or is deleted normally.

int32_t alive_count_change

The change in the alive_count since the status was last read.

int32_t not_alive_count_change

The change in the not_alive_count since the status was last read.