Use these QoS fields to configure how much data, which data, and when that data is available to an application.

Data availability refers to configurations such as ownership and lifespan.

Basic Settings


com.rti.dds.infrastructure.DurabilityQosPolicy	kind
	<<basic>> <<spec>> The kind of durability.

com.rti.dds.infrastructure.DurabilityQosPolicy	writer_depth
	<<basic>> <<extension>> Indicates the number of samples per instance that a durable com.rti.dds.publication.DataWriter will send to a late-joining com.rti.dds.subscription.DataReader.

com.rti.dds.infrastructure.DeadlineQosPolicy	period
	<<basic>> <<spec>> Duration of the deadline period.

com.rti.dds.infrastructure.OwnershipQosPolicy	kind
	<<basic>> <<spec>> The kind of ownership

com.rti.dds.infrastructure.OwnershipStrengthQosPolicy	value
	<<basic>> <<spec>> The strength value used to arbitrate among multiple writers.

com.rti.dds.infrastructure.TimeBasedFilterQosPolicy	minimum_separation
	<<basic>> <<spec>> The minimum separation duration between subsequent samples.

com.rti.dds.infrastructure.HistoryQosPolicy	kind
	<<basic>> <<spec>> Specifies the kind of history to be kept.

com.rti.dds.infrastructure.HistoryQosPolicy	depth
	<<basic>> <<spec>> Specifies the number of samples per instance to be kept, when the `kind` is com.rti.dds.infrastructure.HistoryQosPolicyKind.HistoryQosPolicyKind.KEEP_LAST_HISTORY_QOS

com.rti.dds.infrastructure.ResourceLimitsQosPolicy	max_samples
	<<basic>> <<spec>> Represents the maximum samples the middleware can store for any one com.rti.dds.publication.DataWriter (or com.rti.dds.subscription.DataReader).

com.rti.dds.infrastructure.ResourceLimitsQosPolicy	max_instances
	<<basic>> <<spec>> Represents the maximum number of instances a com.rti.dds.publication.DataWriter (or com.rti.dds.subscription.DataReader) can manage.

com.rti.dds.infrastructure.LifespanQosPolicy	duration
	<<basic>> <<spec>> Maximum duration for the data's validity.

com.rti.dds.infrastructure.MonitoringEventDistributionSettings	publication_period
	<<basic>> <<extension>> Period at which the event metric thread publishes the event metrics that have changed since the last time they were published.

com.rti.dds.infrastructure.MonitoringPeriodicDistributionSettings	polling_period
	<<basic>> <<extension>> Period at which the periodic metric thread polls and publishes the periodic metrics.

com.rti.dds.infrastructure.MonitoringLoggingDistributionSettings	publication_period
	<<basic>> <<extension>> Period at which the logging thread publishes log messages.

Advanced Settings


com.rti.dds.infrastructure.AvailabilityQosPolicy	enable_required_subscriptions
	<<extension>> Enables support for required subscriptions in a com.rti.dds.publication.DataWriter

com.rti.dds.infrastructure.AvailabilityQosPolicy	max_data_availability_waiting_time
	<<extension>> Defines how much time to wait before delivering a sample to the application without having received some of the previous samples.

com.rti.dds.infrastructure.AvailabilityQosPolicy	max_endpoint_availability_waiting_time
	<<extension>> Defines how much time to wait to discover DataWriters providing samples for the same data source (virtual GUID).

com.rti.dds.infrastructure.AvailabilityQosPolicy	required_matched_endpoint_groups
	<<extension>> A sequence of endpoint groups.

com.rti.dds.infrastructure.DurabilityQosPolicy	direct_communication
	<<extension>> Indicates whether or not a TRANSIENT or PERSISTENT com.rti.dds.subscription.DataReader should receive samples directly from a TRANSIENT or PERSISTENT com.rti.dds.publication.DataWriter

com.rti.dds.infrastructure.DurabilityQosPolicy	storage_settings
	<<extension>> Configures durable writer history and durable reader state.

com.rti.dds.infrastructure.DurabilityServiceQosPolicy	service_cleanup_delay
	<<spec>> Controls when the service is able to remove all information regarding a data instances.

com.rti.dds.infrastructure.DurabilityServiceQosPolicy	max_samples
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.

com.rti.dds.infrastructure.DurabilityServiceQosPolicy	max_instances
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.

com.rti.dds.infrastructure.DurabilityServiceQosPolicy	max_samples_per_instance
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.

com.rti.dds.infrastructure.PresentationQosPolicy	access_scope
	<<spec>> Determines the largest scope spanning the entities for which the order and coherency of changes can be preserved.

com.rti.dds.infrastructure.PresentationQosPolicy	coherent_access
	<<spec>> Specifies support for coherent access. Controls whether coherent access is supported within the scope `access_scope`.

com.rti.dds.infrastructure.PresentationQosPolicy	ordered_access
	<<spec>> Specifies support for ordered access to the samples received at the subscription end. Controls whether ordered access is supported within the scope `access_scope`.

com.rti.dds.infrastructure.PresentationQosPolicy	drop_incomplete_coherent_set
	<<extension>> Indicates whether or not a com.rti.dds.subscription.DataReader should drop samples from an incomplete coherent set (one for which not all the samples were received). Such samples are reported as lost in the SAMPLE_LOST Status.

com.rti.dds.infrastructure.LatencyBudgetQosPolicy	duration
	<<spec>> Duration of the maximum acceptable delay.

com.rti.dds.infrastructure.ResourceLimitsQosPolicy	max_samples_per_instance
	<<spec>> Represents the maximum number of samples of any one instance a com.rti.dds.publication.DataWriter (or com.rti.dds.subscription.DataReader) can manage.

com.rti.dds.infrastructure.ReaderDataLifecycleQosPolicy	autopurge_nowriter_samples_delay
	<<spec>> Minimum duration for which the com.rti.dds.subscription.DataReader will maintain samples for an instance once its `instance_state` becomes com.rti.dds.subscription.InstanceStateKind.NOT_ALIVE_NO_WRITERS_INSTANCE_STATE.

com.rti.dds.infrastructure.ReaderDataLifecycleQosPolicy	autopurge_disposed_samples_delay
	<<spec>> Minimum duration for which the com.rti.dds.subscription.DataReader will maintain samples for an instance once its `instance_state` becomes com.rti.dds.subscription.InstanceStateKind.NOT_ALIVE_DISPOSED_INSTANCE_STATE.

com.rti.dds.infrastructure.ReaderDataLifecycleQosPolicy	autopurge_disposed_instances_delay
	<<extension>> Minimum duration for which the com.rti.dds.subscription.DataReader will maintain information about a received instance once its `instance_state` becomes com.rti.dds.subscription.InstanceStateKind.NOT_ALIVE_DISPOSED_INSTANCE_STATE and there are no samples for the instance in the DataReader queue.

com.rti.dds.infrastructure.ReaderDataLifecycleQosPolicy	autopurge_nowriter_instances_delay
	<<extension>> Minimum duration for which the com.rti.dds.subscription.DataReader will maintain information about a received instance once its `instance_state` becomes com.rti.dds.subscription.InstanceStateKind.NOT_ALIVE_NO_WRITERS_INSTANCE_STATE and there are no samples for the instance in the DataReader queue.

com.rti.dds.infrastructure.TransportMulticastMappingQosPolicy	value
	<<extension>> A sequence of multicast communication mappings.

com.rti.dds.infrastructure.TransportMulticastQosPolicy	kind
	<<extension>> A value that specifies a way to determine how to obtain the multicast address.

com.rti.dds.infrastructure.DataWriterProtocolQosPolicy	virtual_guid
	<<extension>> The virtual GUID (Global Unique Identifier).

com.rti.dds.infrastructure.DataWriterProtocolQosPolicy	push_on_write
	<<extension>> Whether to push sample out when write is called.

com.rti.dds.infrastructure.BatchQosPolicy	source_timestamp_resolution
	<<extension>> Batch source timestamp resolution.

com.rti.dds.infrastructure.ChannelSettings_t	priority
	<<extension>> Publication priority

com.rti.dds.infrastructure.MultiChannelQosPolicy	channels
	<<extension>> A sequence of com.rti.dds.infrastructure.ChannelSettings_t used to configure the channels' properties. If the length of the sequence is zero, the QoS policy will be ignored.

com.rti.dds.infrastructure.MultiChannelQosPolicy	filter_name
	<<extension>> Name of the filter class used to describe the filter expressions of a MultiChannel DataWriter.