Struct DurabilityKind_def

• Defined in File PolicyKind.hpp

Struct Documentation

struct DurabilityKind_def

Public Types

enum Type

Values:

enumerator VOLATILE

The samples are not available to late-joining DataReaders. In other words, only DataReaders, which were present at the time of the writing and have subscribed to this Topic, will receive the sample. When a DataReader subscribes afterwards (late-joining), it will only be able to read the next written sample. This setting is typically used for data, which is updated quickly.

enumerator TRANSIENT_LOCAL

Currently behaves identically to the TRANSIENT_DURABILITY_QOS, except for its RxO properties. The desired behaviour of TRANSIENT_LOCAL_DURABILITY_QOS can be achieved from the TRANSIENT_DURABILITY_QOS with the default (TRUE) setting of the autodispose_unregistered_instances flag on the DataWriter and the service_cleanup_delay set to 0 on the durability service. This is because for TRANSIENT_LOCAL, the data should only remain available for late-joining readers during the lifetime of its source writer, so it is not required to survive after its source writer has been deleted. Since the deletion of a writer implicitly unregisters all its instances, an autodispose_unregistered_instances value of TRUE will also dispose the affected data from the durability store, and thus prevent it from remaining available to late joining readers.