Use these QoS fields to configure how much and how long data remains retrievable in the system.


rti::core::policy::Availability	enable_required_subscriptions
	<<extension>> Enables support for required subscriptions in a dds::pub::DataWriter

rti::core::policy::Availability	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.

rti::core::policy::Availability	max_endpoint_availability_waiting_time
	<<extension>> Defines how much time to wait to discover DataWriters providing samples for the same data source (virtual GUID).

rti::core::policy::Availability	required_matched_endpoint_groups
	<<extension>> A sequence of endpoint groups.

dds::core::policy::Durability	kind
	<<basic>> <<spec>> The kind of durability.

dds::core::policy::Durability	direct_communication
	<<extension>> Indicates whether or not a TRANSIENT or PERSISTENT dds::sub::DataReader should receive samples directly from a TRANSIENT or PERSISTENT dds::pub::DataWriter

dds::core::policy::Durability	writer_depth
	<<basic>> <<extension>> Indicates the number of samples per instance that a durable dds::pub::DataWriter will send to a late-joining dds::sub::DataReader.

dds::core::policy::Durability	storage_settings
	<<extension>> Configures durable writer history and durable reader state.

rti::core::PersistentStorageSettings	enable
	<<extension>> Enables durable writer history in a dds::pub::DataWriter and durable reader state in a dds::sub::DataReader.

rti::core::PersistentStorageSettings	file_name
	<<extension>> The file name where the durable writer history or durable reader state will be stored.

rti::core::PersistentStorageSettings	trace_file_name
	<<extension>> The file name where to store the SQL statements executed when loading and storing the durable writer history or durable reader state.

rti::core::PersistentStorageSettings	journal_kind
	<<extension>> Sets the journal mode of the persistent storage.

rti::core::PersistentStorageSettings	synchronization_kind
	<<extension>> Sets the level of synchronization with the physical disk.

rti::core::PersistentStorageSettings	vacuum
	<<extension>> Sets the auto-vacuum status of the storage.

rti::core::PersistentStorageSettings	restore
	<<extension>> Indicates if the persisted writer history or reader state must be restored.

rti::core::PersistentStorageSettings	writer_instance_cache_allocation
	<<extension>> Configures the resource limits associated with the instance durable writer history cache.

rti::core::PersistentStorageSettings	writer_sample_cache_allocation
	<<extension>> Configures the resource limits associated with the sample durable writer history cache.

rti::core::PersistentStorageSettings	writer_memory_state
	<<extension>> Determines how much state will be kept in memory by the durable writer history in order to avoid accessing the persistent storage in disk.

rti::core::PersistentStorageSettings	reader_checkpoint_frequency
	<<extension>> Controls how often the reader state is stored into the database.

dds::core::policy::DurabilityService	service_cleanup_delay
	<<spec>> Controls when the service is able to remove all information regarding a data instances.

dds::core::policy::DurabilityService	history_kind
	<<spec>> The kind of history to apply in recouping durable data.

dds::core::policy::DurabilityService	history_depth
	<<spec>> Setting to use for the dds::core::policy::Durability::writer_depth when recouping durable data.

dds::core::policy::DurabilityService	max_samples
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.

dds::core::policy::DurabilityService	max_instances
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.

dds::core::policy::DurabilityService	max_samples_per_instance
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.

dds::core::policy::ResourceLimits	max_samples
	<<basic>> <<spec>> Represents the maximum samples the middleware can store for any one dds::pub::DataWriter (or dds::sub::DataReader).

dds::core::policy::ResourceLimits	max_instances
	<<basic>> <<spec>> Represents the maximum number of instances a dds::pub::DataWriter (or dds::sub::DataReader) can manage.

dds::core::policy::ResourceLimits	max_samples_per_instance
	<<spec>> Represents the maximum number of samples of any one instance a dds::pub::DataWriter (or dds::sub::DataReader) can manage.

dds::core::policy::Lifespan	duration
	<<basic>> <<spec>> Maximum duration for the data's validity.

rti::core::policy::DataWriterProtocol	propagate_app_ack_with_no_response
	<<extension>> Controls whether or not a dds::pub::DataWriter receives dds::pub::DataWriterListener::on_application_acknowledgment notifications with an empty or invalid response.

rti::core::policy::RtpsReliableWriterProtocol	disable_positive_acks_enable_adaptive_sample_keep_duration
	[DEPRECATED] <<extension>> Enables dynamic adjustment of sample keep duration in response to congestion.

rti::core::policy::RtpsReliableWriterProtocol	disable_positive_acks_min_sample_keep_duration
	<<extension>> The minimum duration a sample is queued for ACK-disabled readers.

rti::core::policy::RtpsReliableWriterProtocol	disable_positive_acks_max_sample_keep_duration
	<<extension>> The maximum duration a sample is queued for ACK-disabled readers.

rti::core::policy::RtpsReliableWriterProtocol	disable_positive_acks_decrease_sample_keep_duration_factor
	[DEPRECATED] <<extension>> Controls rate of contraction of dynamic sample keep duration.

rti::core::policy::RtpsReliableWriterProtocol	disable_positive_acks_increase_sample_keep_duration_factor
	[DEPRECATED] <<extension>> Controls rate of growth of dynamic sample keep duration.

rti::core::policy::BuiltinTopicReaderResourceLimits	initial_samples
	<<extension>> Initial number of samples.

rti::core::policy::BuiltinTopicReaderResourceLimits	max_samples
	<<extension>> Maximum number of samples.

rti::core::policy::EntityName	role_name
	<<extension>> The entity role name.