Data Fields | |
struct DDS_Duration_t | duration |
Maximum duration for the data's validity. |
Each data sample written by the DDS_DataWriter has an associated expiration time beyond which the data should not be delivered to any application. Once the sample expires, the data will be removed from the DDS_DataReader caches as well as from the transient and persistent information caches.
The expiration time of each sample from the DDS_DataWriter's cache is computed by adding the duration specified by this QoS policy to the sample's source timestamp. The expiration time of each sample from the DDS_DataReader's cache is computed by adding the duration to the reception timestamp.
You may also use this QoS policy to ensure that applications do not receive or act on data, commands or messages that are too old and have 'expired.'
To avoid inconsistencies, multiple writers of the same instance should have the same lifespan.
struct DDS_Duration_t DDS_LifespanQosPolicy::duration [read] |
Maximum duration for the data's validity.
[default] DDS_DURATION_INFINITE
[range] [1 nanosec, 1 year] or DDS_DURATION_INFINITE