Content Filtering

Use these QoS fields if you are using content filtering on your data.

Use these QoS fields if you are using content filtering on your data.

Content filtering most commonly refers to using a DDSContentFilteredTopic, but data can also be filtered using DDSTopicQuery to run a new filter over the data in a DataWriter's cache, or DDSQueryCondition to read a subset of the data that is currently stored in the DataReader's cache.

See also

Queries and Filters Syntax.

Advanced Settings

DDS_DataReaderResourceLimitsQosPolicy	max_query_condition_filters
	<<extension>> The maximum number of query condition filters a reader is allowed.
DDS_DataWriterResourceLimitsQosPolicy	max_remote_reader_filters
	<<extension>> The maximum number of remote DataReaders for which the DDSDataWriter will perform content-based filtering.
DDS_DomainParticipantResourceLimitsQosPolicy	content_filtered_topic_allocation
	<<extension>> Allocation settings applied to content filtered topic.
DDS_DomainParticipantResourceLimitsQosPolicy	content_filter_allocation
	<<extension>> Allocation settings applied to content filter.
DDS_DomainParticipantResourceLimitsQosPolicy	query_condition_allocation
	<<extension>> Allocation settings applied to query condition pool.
DDS_DomainParticipantResourceLimitsQosPolicy	content_filtered_topic_hash_buckets
	[DEPRECATED] <<extension>> Number of hash buckets for content filtered topics.
DDS_DomainParticipantResourceLimitsQosPolicy	content_filter_hash_buckets
	[DEPRECATED] <<extension>> Number of hash buckets for content filters.
DDS_DomainParticipantResourceLimitsQosPolicy	contentfilter_property_max_length
	<<extension>> This field is the maximum length of all data related to a Content-filtered topic.
DDS_DomainParticipantResourceLimitsQosPolicy	channel_seq_max_length
	<<extension>> Maximum number of channels that can be specified in DDS_MultiChannelQosPolicy for MultiChannel DataWriters.
DDS_DomainParticipantResourceLimitsQosPolicy	channel_filter_expression_max_length
	<<extension>> Maximum length of a channel DDS_ChannelSettings_t::filter_expression in a MultiChannel DataWriter.
DDS_ChannelSettings_t	multicast_settings
	<<extension>> A sequence of DDS_TransportMulticastSettings_t used to configure the multicast addresses associated with a channel.
DDS_ChannelSettings_t	filter_expression
	<<extension>> A logical expression used to determine the data that will be published in the channel.
DDS_MultiChannelQosPolicy	filter_name
	<<extension>> Name of the filter class used to describe the filter expressions of a MultiChannel DataWriter.