OpenSplice C# API  v6.x
OpenSplice C# Data Distribution Service Data-Centric Publish-Subscribe API
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DDS.DeadlineQosPolicy Struct Reference

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Public Attributes

Duration Period
 

Detailed Description

This QosPolicy defines the period within which a new sample is expected by the DataReader or to be written by the DataWriter.

Attributes

Value Meaning Concerns RxO Changeable
A duration:
period 		DataReader expects a new sample updating the value of each instance at least once every deadline period. DataWriter indicates that the application commits to write a new value (using the DataWriter) for each instance managed by the DataWriter at least once every deadline period. It is inconsistent for a DataReader to have a DEADLINE period less than its TIME_BASED_FILTER's minimum_separation. The default value of the deadline period is infinite. Topic, DataReader, DataWriter Yes Yes

This policy is useful for cases where a Topic is expected to have each instance updated periodically. On the publishing side this setting establishes a contract that the application must meet. On the subscribing side the setting establishes a minimum requirement for the remote publishers that are expected to supply the data values.

When the Service ‘matches’ a DataWriter and a DataReader it checks whether the settings are compatible (i.e., offered deadline period<= requested deadline period) if they are not, the two entities are informed (via the listener or condition mechanism) of the incompatibility of the QoS settings and communication will not occur. Assuming that the reader and writer ends have compatible settings, the fulfilment of this contract is monitored by the Service and the application is informed of any violations by means of the proper listener or condition.

The value offered is considered compatible with the value requested if and only if the inequality “offered deadline period <= requested deadline period” evaluates to ‘TRUE.’

The setting of the DEADLINE policy must be set consistently with that of the TIME_BASED_FILTER. For these two policies to be consistent the settings must be such that “deadline period>= minimum_separation.”

Definition at line 1290 of file DdsDcpsStructs.cs.

Member Data Documentation

◆ Period

Duration DDS.DeadlineQosPolicy.Period

Definition at line 1292 of file DdsDcpsStructs.cs.

The documentation for this struct was generated from the following file: