DDS::LatencyBudgetQosPolicy Struct Reference
[LATENCY_BUDGET]

Provides a hint as to the maximum acceptable delay from the time the data is written to the time it is received by the subscribing applications. More...

#include <managed_infrastructure.h>

List of all members.

Static Public Member Functions

static System::String^ get_latencybudget_qos_policy_name ()
 Stringified human-readable name for DDS::LatencyBudgetQosPolicy.

Public Attributes

Duration_t duration
 Duration of the maximum acceptable delay.


Detailed Description

Provides a hint as to the maximum acceptable delay from the time the data is written to the time it is received by the subscribing applications.

This policy is a hint to a DDS implementation; it can be used to change how it processes and sends data that has low latency requirements. The DDS specification does not mandate whether or how this policy is used.

Entity:
DDS::Topic, DDS::DataReader, DDS::DataWriter
Status:
DDS::StatusKind::OFFERED_INCOMPATIBLE_QOS_STATUS, DDS::StatusKind::REQUESTED_INCOMPATIBLE_QOS_STATUS
Properties:
RxO = YES
Changeable = YES
See also:
DDS::PublishModeQosPolicy

DDS::FlowController

Usage

This policy provides a means for the application to indicate to the middleware the urgency of the data communication. By having a non-zero duration, RTI Data Distribution Service can optimize its internal operation.

RTI Data Distribution Service uses it in conjunction with DDS::PublishModeQosPolicyKind::ASYNCHRONOUS_PUBLISH_MODE_QOS DDS::DataWriter instances associated with a DDS::FlowControllerSchedulingPolicy::EDF_FLOW_CONTROLLER_SCHED_POLICY DDS::FlowController only. Together with the time of write, DDS::LatencyBudgetQosPolicy::duration determines the deadline of each individual sample. RTI Data Distribution Service uses this information to prioritize the sending of asynchronously published data; see DDS::AsynchronousPublisherQosPolicy.

Compatibility

The value offered is considered compatible with the value requested if and only if the inequality offered duration <= requested duration evaluates to 'TRUE'.

Member Data Documentation

Duration of the maximum acceptable delay.

[default] 0 (meaning minimize the delay)


RTI Data Distribution Service .Net APIs Version 4.5c Copyright © 9 Jun 2010 Real-Time Innovations, Inc