RTI Connext Java API Version 7.1.0
|
Specifies how long the data written by the com.rti.dds.publication.DataWriter is considered valid. More...
Public Attributes | |
final Duration_t | duration |
Maximum duration for the data's validity. More... | |
![]() | |
final QosPolicyId_t | id |
The ID of this QoS policy. More... | |
final String | policy_name |
The name of this QoS policy. More... | |
Specifies how long the data written by the com.rti.dds.publication.DataWriter is considered valid.
Each data sample written by the com.rti.dds.publication.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 com.rti.dds.subscription.DataReader caches as well as from the transient and persistent information caches.
The expiration time of each sample from the com.rti.dds.publication.DataWriter's cache is computed by adding the duration specified by this QoS policy to the time when the sample is added to the com.rti.dds.publication.DataWriter's cache. This timestamp is not necessarily equal to the sample's source timestamp that can be provided by the user using the com.rti.ndds.example.FooDataWriter.write_w_timestamp or com.rti.ndds.example.FooDataWriter.write_w_params API.
The expiration time of each sample from the com.rti.dds.subscription.DataReader's cache is computed by adding the duration to the reception timestamp.
The Lifespan QoS policy can be used to control how much data is stored by RTI Connext. Even if it is configured to store "all" of the data sent or received for a topic (see com.rti.dds.infrastructure.HistoryQosPolicy), the total amount of data it stores may be limited by this QoS policy.
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.
final Duration_t duration |
Maximum duration for the data's validity.
[default] com.rti.dds.infrastructure.Duration_t.DURATION_INFINITE
[range] [1 nanosec, 1 year] or com.rti.dds.infrastructure.Duration_t.DURATION_INFINITE