<<spec>> Controls the criteria used to determine the logical order among changes made by DDS_Publisher entities to the same instance of data (i.e., matching DDS_Topic and key). More...

Data Structures
struct	DDS_DestinationOrderQosPolicy
	<<spec>> Controls how the middleware will deal with data sent by multiple DDS_DataWriter entities for the same instance of data (i.e., same DDS_Topic and key). More...

Enumerations
enum	DDS_DestinationOrderQosPolicyKind { DDS_BY_RECEPTION_TIMESTAMP_DESTINATIONORDER_QOS , DDS_BY_SOURCE_TIMESTAMP_DESTINATIONORDER_QOS }
	Kinds of destination order. More...

enum	DDS_DestinationOrderQosPolicyScopeKind { DDS_INSTANCE_SCOPE_DESTINATIONORDER_QOS , DDS_TOPIC_SCOPE_DESTINATIONORDER_QOS }
	Scope of source destination order. More...

Variables
const char *const	DDS_DESTINATIONORDER_QOS_POLICY_NAME
	Stringified human-readable name for DDS_DestinationOrderQosPolicy. More...

Detailed Description

<<spec>> Controls the criteria used to determine the logical order among changes made by DDS_Publisher entities to the same instance of data (i.e., matching DDS_Topic and key).

Enumeration Type Documentation

◆ DDS_DestinationOrderQosPolicyKind

enum DDS_DestinationOrderQosPolicyKind

Kinds of destination order.

QoS:: DDS_DestinationOrderQosPolicy

Enumerator

DDS_BY_RECEPTION_TIMESTAMP_DESTINATIONORDER_QOS

[default] Indicates that data is ordered based on the reception time at each DDS_Subscriber.

Since each subscriber may receive the data at different times there is no guarantee that the changes will be seen in the same order. Consequently, it is possible for each subscriber to end up with a different final value for the data.

DDS_BY_SOURCE_TIMESTAMP_DESTINATIONORDER_QOS

Indicates that data is ordered based on a time-stamp placed at the source (by RTI Connext or by the application).

In any case this guarantees a consistent final value for the data in all subscribers.

Note: If Batching is needed along with DDS_BY_SOURCE_TIMESTAMP_DESTINATIONORDER_QOS and DDS_INSTANCE_SCOPE_DESTINATIONORDER_QOS, then the DDS_BatchQosPolicy::source_timestamp_resolution and DDS_BatchQosPolicy::thread_safe_write setting of DDS_BatchQosPolicy should be set to DDS_DURATION_ZERO and DDS_BOOLEAN_TRUE respectively.

◆ DDS_DestinationOrderQosPolicyScopeKind

enum DDS_DestinationOrderQosPolicyScopeKind

Scope of source destination order.

QoS:: DDS_DestinationOrderQosPolicy

Enumerator

DDS_INSTANCE_SCOPE_DESTINATIONORDER_QOS

[default] Indicates that data is ordered on a per instance basis if used along with DDS_BY_SOURCE_TIMESTAMP_DESTINATIONORDER_QOS.

The source timestamp of the current sample is compared to the source timestamp of the previously received sample for the same instance. The tolerance check is also applied per instance.

DDS_TOPIC_SCOPE_DESTINATIONORDER_QOS

Indicates that data is ordered on a per topic basis if used along with DDS_BY_SOURCE_TIMESTAMP_DESTINATIONORDER_QOS.

The source timestamp of the current sample is compared to the source timestamp of the previously received sample for the same topic. The tolerance check is also applied per topic.

Variable Documentation

◆ DDS_DESTINATIONORDER_QOS_POLICY_NAME

const char* const DDS_DESTINATIONORDER_QOS_POLICY_NAME

extern

Stringified human-readable name for DDS_DestinationOrderQosPolicy.

Data Structures