DDS_DataWriterQos Struct Reference

<<cert>> QoS policies supported by a DDSDataWriter entity. More...

List of all members.

Public Attributes
struct DDS_DeadlineQosPolicy	deadline
	Deadline policy, DEADLINE.
struct DDS_LivelinessQosPolicy	liveliness
	Liveliness policy, LIVELINESS.
struct DDS_HistoryQosPolicy	history
	History policy, HISTORY.
struct DDS_ResourceLimitsQosPolicy	resource_limits
	Resource limits policy, RESOURCE_LIMITS.
struct DDS_OwnershipQosPolicy	ownership
	Ownership policy, OWNERSHIP.
struct DDS_OwnershipStrengthQosPolicy	ownership_strength
	Ownership strength policy, OWNERSHIP_STRENGTH.
struct DDS_ReliabilityQosPolicy	reliability
	Reliability policy, RELIABILITY.
struct DDS_DurabilityQosPolicy	durability
	<<eXtension>> Durability policy, DURABILITY.
struct DDS_DestinationOrderQosPolicy	destination_order
	<<eXtension>> Destination Order policy, DESTINATION_ORDER.
struct DDS_DataWriterProtocolQosPolicy	protocol
	<<eXtension>> DDSDataWriter protocol policy, DATA_WRITER_PROTOCOL
struct DDS_TransportQosPolicy	transport
	Transport policy, TRANSPORT. Only unicast transports are supported.
struct DDS_DataWriterResourceLimitsQosPolicy	writer_resource_limits
	Writer resource limits policy, DataWriter Resource Limits.

---

Detailed Description

<<cert>> QoS policies supported by a DDSDataWriter entity.

The DDS_DataWriterQos controls the resources allocated by a DDSDataWriter. Each DDSDataWriter allocates its own resources, even DataWriters of the same DDSTopic. For this reason is it advised to limit the number of DataWriters per topic.

You must set certain members in a consistent manner:

- DDS_DataWriterQos::DDS_HistoryQosPolicy::depth <= DDS_DataWriterQos::DDS_ResourceLimitsQosPolicy::max_samples_per_instance

- DDS_DataWriterQos::DDS_ResourceLimitsQosPolicy::max_samples_per_instance <= DDS_DataWriterQos::DDS_ResourceLimitsQosPolicy::max_samples

If any of the above are not true, DDSDataWriter::set_qos and DDSPublisher::set_default_datawriter_qos will fail with DDS_RETCODE_INCONSISTENT_POLICY and DDSPublisher::create_datawriter and will return NULL.

Entity:

DDSDataWriter

See also:

QoS Policies allowed ranges within each Qos.

---

Member Data Documentation

struct DDS_DeadlineQosPolicy DDS_DataWriterQos::deadline

Deadline policy, DEADLINE.

struct DDS_LivelinessQosPolicy DDS_DataWriterQos::liveliness

Liveliness policy, LIVELINESS.

struct DDS_HistoryQosPolicy DDS_DataWriterQos::history

History policy, HISTORY.

struct DDS_ResourceLimitsQosPolicy DDS_DataWriterQos::resource_limits

Resource limits policy, RESOURCE_LIMITS.

struct DDS_OwnershipQosPolicy DDS_DataWriterQos::ownership

Ownership policy, OWNERSHIP.

struct DDS_OwnershipStrengthQosPolicy DDS_DataWriterQos::ownership_strength

Ownership strength policy, OWNERSHIP_STRENGTH.

struct DDS_ReliabilityQosPolicy DDS_DataWriterQos::reliability

Reliability policy, RELIABILITY.

struct DDS_DurabilityQosPolicy DDS_DataWriterQos::durability

<<eXtension>> Durability policy, DURABILITY.

struct DDS_DestinationOrderQosPolicy DDS_DataWriterQos::destination_order

<<eXtension>> Destination Order policy, DESTINATION_ORDER.

struct DDS_DataWriterProtocolQosPolicy DDS_DataWriterQos::protocol

<<eXtension>> DDSDataWriter protocol policy, DATA_WRITER_PROTOCOL

struct DDS_TransportQosPolicy DDS_DataWriterQos::transport

Transport policy, TRANSPORT. Only unicast transports are supported.

struct DDS_DataWriterResourceLimitsQosPolicy DDS_DataWriterQos::writer_resource_limits

Writer resource limits policy, DataWriter Resource Limits.