DDS_DurabilityServiceQosPolicy Struct Reference

Various settings to configure the external RTI Persistence Service used by RTI Connext for DataWriters with a DDS_DurabilityQosPolicy setting of DDS_PERSISTENT_DURABILITY_QOS or DDS_TRANSIENT_DURABILITY_QOS. More...

Data Fields
struct DDS_Duration_t	service_cleanup_delay
	Controls when the service is able to remove all information regarding a data instances. More...
DDS_HistoryQosPolicyKind	history_kind
	The kind of history to apply in recouping durable data. More...
DDS_Long	history_depth
	Setting to use for the DDS_DurabilityQosPolicy::writer_depth when recouping durable data. More...
DDS_Long	max_samples
	Part of resource limits QoS policy to apply when feeding a late joiner. More...
DDS_Long	max_instances
	Part of resource limits QoS policy to apply when feeding a late joiner. More...
DDS_Long	max_samples_per_instance
	Part of resource limits QoS policy to apply when feeding a late joiner. More...

Detailed Description

Various settings to configure the external RTI Persistence Service used by RTI Connext for DataWriters with a DDS_DurabilityQosPolicy setting of DDS_PERSISTENT_DURABILITY_QOS or DDS_TRANSIENT_DURABILITY_QOS.

Entity:

DDS_Topic, DDS_DataWriter

Properties:

RxO = NO
Changeable = UNTIL ENABLE

See also

DURABILITY

HISTORY

RESOURCE_LIMITS

Usage

When a DataWriter's DDS_DurabilityQosPolicy::kind is DDS_PERSISTENT_DURABILITY_QOS or DDS_TRANSIENT_DURABILITY_QOS, an external service, the RTI Persistence Service, is used to store and possibly forward the data sent by the DDS_DataWriter to DDS_DataReader objects that are created after the data was initially sent.

This QoS policy is used to configure certain parameters of the Persistence Service when it operates on the behalf of the DDS_DataWriter, such as how much data to store. For example, it configures the DURABILITY, HISTORY, and the RESOURCE_LIMITS used by the fictitious DataReader and DataWriter used by the Persistence Service. Note, however, that the Persistence Service itself may be configured to ignore these values and instead use values from its own configuration file.

Field Documentation

service_cleanup_delay

struct DDS_Duration_t DDS_DurabilityServiceQosPolicy::service_cleanup_delay

Controls when the service is able to remove all information regarding a data instances.

When the service cleanup delay is set to 0, disposed instances will be completely removed from the service. Only values of 0 and DDS_DURATION_INFINITE are currently supported.

[default] 0

history_kind

DDS_HistoryQosPolicyKind DDS_DurabilityServiceQosPolicy::history_kind

The kind of history to apply in recouping durable data.

[default] DDS_KEEP_LAST_HISTORY_QOS

history_depth

DDS_Long DDS_DurabilityServiceQosPolicy::history_depth

Setting to use for the DDS_DurabilityQosPolicy::writer_depth when recouping durable data.

If the DDS_HistoryQosPolicy::depth is set to a value lower than this value, DDS_HistoryQosPolicy::depth will be set equal to the value of this field.

[default] DDS_AUTO_WRITER_DEPTH (1)

max_samples

DDS_Long DDS_DurabilityServiceQosPolicy::max_samples

Part of resource limits QoS policy to apply when feeding a late joiner.

[default] DDS_LENGTH_UNLIMITED

max_instances

DDS_Long DDS_DurabilityServiceQosPolicy::max_instances

Part of resource limits QoS policy to apply when feeding a late joiner.

[default] DDS_LENGTH_UNLIMITED

max_samples_per_instance

DDS_Long DDS_DurabilityServiceQosPolicy::max_samples_per_instance

Part of resource limits QoS policy to apply when feeding a late joiner.

[default] DDS_LENGTH_UNLIMITED