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DDS::TypedDataWriter< T > Class Template Reference

<<interface>> <<generic>> User data type specific data writer. More...

#include <managed_publication.h>

Inheritance diagram for DDS::TypedDataWriter< T >:
DDS::DataWriter DDS::DomainEntity DDS::Entity DDS::BytesDataWriter DDS::DynamicDataWriter DDS::KeyedBytesDataWriter DDS::KeyedStringDataWriter DDS::StringDataWriter FooDataWriter FooDataWriter

Public Member Functions

InstanceHandle_t register_instance (T instance_data)
 Informs RTI Connext that the application will be modifying a particular instance.
 
InstanceHandle_t register_instance_w_timestamp (T instance_data, DDS::Time_t% source_timestamp)
 Performs the same functions as register_instance except that the application provides the value for the source_timestamp.
 
InstanceHandle_t register_instance_w_params (T instance_data, DDS::WriteParams_t^ params)
 Performs the same function as DDS::TypedDataWriter::register_instance and DDS::TypedDataWriter::register_instance_w_timestamp except that it also provides the values contained in params.
 
void unregister_instance (T instance_data, DDS::InstanceHandle_t% handle)
 Reverses the action of DDS::TypedDataWriter::register_instance.
 
void unregister_instance_w_timestamp (T instance_data, DDS::InstanceHandle_t% handle, DDS::Time_t% source_timestamp)
 Performs the same function as DDS::TypedDataWriter::unregister_instance except that it also provides the value for the source_timestamp.
 
void unregister_instance_w_params (T instance_data, DDS::WriteParams_t^ params)
 Performs the same function as DDS::TypedDataWriter::unregister_instance and DDS::TypedDataWriter::unregister_instance_w_timestamp except that it also provides the values contained in params.
 
void write (T instance_data, DDS::InstanceHandle_t% handle)
 Modifies the value of a data instance.
 
void write_w_timestamp (T instance_data, DDS::InstanceHandle_t% handle, DDS::Time_t% source_timestamp)
 Performs the same function as DDS::TypedDataWriter::write except that it also provides the value for the source_timestamp.
 
void write_w_params (T instance_data, DDS::WriteParams_t^ params)
 Performs the same function as DDS::TypedDataWriter::write and DDS::TypedDataWriter::write_w_timestamp except that it also provides the values contained in params.
 
void dispose (T instance_data, DDS::InstanceHandle_t% instance_handle)
 Requests the middleware to delete the data.
 
void dispose_w_timestamp (T instance_data, DDS::InstanceHandle_t% instance_handle, DDS::Time_t% source_timestamp)
 Performs the same functions as dispose except that the application provides the value for the source_timestamp that is made available to DDS::DataReader objects by means of the source_timestamp attribute inside the DDS::SampleInfo.
 
void dispose_w_params (T instance_data, DDS::WriteParams_t^ params)
 Performs the same function as DDS::TypedDataWriter::dispose and DDS::TypedDataWriter::dispose_w_timestamp except that it also provides the values contained in params.
 
void get_key_value (T key_holder, DDS::InstanceHandle_t% handle)
 Retrieve the instance key that corresponds to an instance handle.
 
InstanceHandle_t lookup_instance (T key_holder)
 Retrieve the instance handle that corresponds to an instance key_holder.
 
- Public Member Functions inherited from DDS::DataWriter
void get_liveliness_lost_status (LivelinessLostStatus% status)
 Accesses the ::DDS::StatusKind::LIVELINESS_LOST_STATUS communication status.
 
void get_offered_deadline_missed_status (OfferedDeadlineMissedStatus% status)
 Accesses the ::DDS::StatusKind::OFFERED_DEADLINE_MISSED_STATUS communication status.
 
void get_offered_incompatible_qos_status (OfferedIncompatibleQosStatus^ status)
 Accesses the ::DDS::StatusKind::OFFERED_INCOMPATIBLE_QOS_STATUS communication status.
 
void get_publication_matched_status (PublicationMatchedStatus% status)
 Accesses the ::DDS::StatusKind::PUBLICATION_MATCHED_STATUS communication status.
 
void get_reliable_writer_cache_changed_status (ReliableWriterCacheChangedStatus% status)
 <<extension>> Get the reliable cache status for this writer.
 
void get_reliable_reader_activity_changed_status (ReliableReaderActivityChangedStatus% status)
 <<extension>> Get the reliable reader activity changed status for this writer.
 
virtual void get_datawriter_cache_status (DataWriterCacheStatus% status)
 <<extension>> Get the datawriter cache status for this writer.
 
virtual void get_datawriter_protocol_status (DataWriterProtocolStatus% status)
 <<extension>> Get the datawriter protocol status for this writer.
 
virtual void get_matched_subscription_datawriter_protocol_status (DataWriterProtocolStatus% status, InstanceHandle_t% subscription_handle)
 <<extension>> Get the datawriter protocol status for this writer, per matched subscription identified by the subscription_handle.
 
virtual void get_matched_subscription_datawriter_protocol_status_by_locator (DataWriterProtocolStatus% status, Locator_t^ locator)
 <<extension>> Get the datawriter protocol status for this writer, per matched subscription identified by the locator.
 
void assert_liveliness ()
 This operation manually asserts the liveliness of this DDS::DataWriter.
 
virtual void get_matched_subscription_locators (LocatorSeq^ locators)
 <<extension>> Retrieve the list of locators for subscriptions currently "associated" with this DDS::DataWriter.
 
void get_matched_subscriptions (InstanceHandleSeq^ subscription_handles)
 Retrieve the list of subscriptions currently "associated" with this DDS::DataWriter.
 
void get_matched_subscription_data (SubscriptionBuiltinTopicData^ subscription_data, InstanceHandle_t% subscription_handle)
 This operation retrieves the information on a subscription that is currently "associated" with the DDS::DataWriter.
 
void get_matched_subscription_participant_data (ParticipantBuiltinTopicData^ participant_data, InstanceHandle_t% subscription_handle)
 This operation retrieves the information on the discovered DDS::DomainParticipant associated with the subscription that is currently matching with the DDS::DataWriter.
 
Topicget_topic ()
 This operation returns the DDS::Topic associated with the DDS::DataWriter.
 
Publisherget_publisher ()
 This operation returns the DDS::Publisher to which the DDS::DataWriter belongs.
 
void wait_for_acknowledgments (Duration_t max_wait)
 Blocks the calling thread until all data written by reliable DDS::DataWriter entity is acknowledged, or until timeout expires.
 
System::Boolean is_sample_app_acknowledged (SampleIdentity_t% identity)
 This method can be used to see if a sample has been application acknowledged.
 
void wait_for_asynchronous_publishing (Duration_t max_wait)
 <<extension>> Blocks the calling thread until asynchronous sending is complete.
 
void set_qos (DataWriterQos^ qos)
 Sets the writer QoS.
 
void set_qos_with_profile (System::String^ library_name, System::String^ profile_name)
 <<extension>> Change the QoS of this writer using the input XML QoS profile.
 
void get_qos (DataWriterQos^ qos)
 Gets the writer QoS.
 
void set_listener (DataWriterListener^ l, StatusMask mask)
 Sets the writer listener.
 
DataWriterListenerget_listener ()
 Get the writer listener.
 
void flush ()
 <<extension>> Flushes the batch in progress in the context of the calling thread.
 
InstanceHandle_t register_instance_untyped (System::Object^ instance_data)
 Register a new instance with this writer.
 
InstanceHandle_t register_instance_w_timestamp_untyped (System::Object^ instance_data, DDS::Time_t% source_timestamp)
 Register a new instance with this writer using the given time instead of the current time.
 
void unregister_instance_untyped (System::Object^ instance_data, DDS::InstanceHandle_t% handle)
 Unregister a new instance from this writer.
 
void unregister_instance_w_timestamp_untyped (System::Object^ instance_data, DDS::InstanceHandle_t% handle, DDS::Time_t% source_timestamp)
 Unregister a new instance from this writer using the given time instead of the current time.
 
void write_untyped (System::Object^ instance_data, DDS::InstanceHandle_t% handle)
 Publish a data sample.
 
void write_w_timestamp_untyped (System::Object^ instance_data, DDS::InstanceHandle_t% handle, DDS::Time_t% source_timestamp)
 Publish a data sample using the given time instead of the current time.
 
void dispose_untyped (System::Object^ instance_data, DDS::InstanceHandle_t% instance_handle)
 Dispose a data sample.
 
void dispose_w_timestamp_untyped (System::Object^ instance_data, DDS::InstanceHandle_t% instance_handle, DDS::Time_t% source_timestamp)
 Dispose a data sample using the given time instead of the current time.
 
void get_key_value_untyped (System::Object^ key_holder, DDS::InstanceHandle_t% handle)
 Fill in the key fields of the given data sample.
 
InstanceHandle_t lookup_instance_untyped (System::Object^ key_holder)
 Given a sample with the given key field values, return the handle corresponding to its instance.
 
virtual void enable () override
 Enables the DDS::Entity.
 
virtual StatusConditionget_statuscondition () override
 Allows access to the DDS::StatusCondition associated with the DDS::Entity.
 
virtual StatusMask get_status_changes () override
 Retrieves the list of communication statuses in the DDS::Entity that are triggered.
 
virtual InstanceHandle_t get_instance_handle () override
 Allows access to the DDS::InstanceHandle_t associated with the DDS::Entity.
 

Detailed Description

template<typename T>
class DDS::TypedDataWriter< T >

<<interface>> <<generic>> User data type specific data writer.

Defines the user data type specific writer interface generated for each application class.

The concrete user data type writer automatically generated by the implementation is an incarnation of this class.

See Also
DDS::DataWriter
Foo
DDS::TypedDataReader
rtiddsgen
Examples:
HelloWorldSupport.cpp.

Member Function Documentation

template<typename T>
InstanceHandle_t DDS::TypedDataWriter< T >::register_instance ( instance_data)
inline

Informs RTI Connext that the application will be modifying a particular instance.

This operation is only useful for keyed data types. Using it for non-keyed types causes no effect and returns DDS::InstanceHandle_t::HANDLE_NIL. The operation takes as a parameter an instance (of which only the key value is examined) and returns a handle that can be used in successive write() or dispose() operations.

The operation gives RTI Connext an opportunity to pre-configure itself to improve performance.

The use of this operation by an application is optional even for keyed types. If an instance has not been pre-registered, the application CPP2_LANGUAGE_ONLY can use the special value DDS::InstanceHandle_t::HANDLE_NIL as the DDS::InstanceHandle_t parameter to the write or dispose operation can call the write() or dipose_instance() overloads that don't receive a DDS::InstanceHandle_t and RTI Connext will auto-register the instance.

For best performance, the operation should be invoked prior to calling any operation that modifies the instance, such as DDS::TypedDataWriter::write, DDS::TypedDataWriter::write_w_timestamp, DDS::TypedDataWriter::dispose and DDS::TypedDataWriter::dispose_w_timestamp and the handle used in conjunction with the data for those calls.

When this operation is used, RTI Connext will automatically supply the value of the source_timestamp that is used.

This operation may fail and return DDS::InstanceHandle_t::HANDLE_NIL if DDS::ResourceLimitsQosPolicy::max_instances limit has been exceeded.

The operation is idempotent. If it is called for an already registered instance, it just returns the already allocated handle. This may be used to lookup and retrieve the handle allocated to a given instance.

This operation can only be called after DDS::DataWriter has been enabled. Otherwise, DDS::InstanceHandle_t::HANDLE_NIL will be returned.

Parameters
instance_data<<in>> The instance that should be registered. Of this instance, only the fields that represent the key are examined by the function. Cannot be NULL.
Returns
For keyed data type, a handle that can be used in the calls that take a DDS::InstanceHandle_t, such as write, dispose, unregister_instance, or return DDS::InstanceHandle_t::HANDLE_NIL on failure. If the instance_data is of a data type that has no keys, this function always returns DDS::InstanceHandle_t::HANDLE_NIL.
See Also
DDS::TypedDataWriter::unregister_instance, DDS::TypedDataWriter::get_key_value, Relationship between registration, liveliness and ownership The need for registering/unregistering instances stems from two use cases:
  • Ownership resolution on redundant systems
  • Detection of loss in topological connectivity
These two use cases also illustrate the semantic differences between the ::DDS::TypedDataWriter::unregister_instance and ::DDS::TypedDataWriter::dispose. BROKEN_SECTIONS
template<typename T>
InstanceHandle_t DDS::TypedDataWriter< T >::register_instance_w_timestamp ( instance_data,
DDS::Time_t source_timestamp 
)
inline

Performs the same functions as register_instance except that the application provides the value for the source_timestamp.

The provided source_timestamp potentially affects the relative order in which readers observe events from multiple writers. Refer to DESTINATION_ORDER QoS policy for details.

This operation may fail and return DDS::InstanceHandle_t::HANDLE_NIL if DDS::ResourceLimitsQosPolicy::max_instances limit has been exceeded.

This operation can only be called after DDS::DataWriter has been enabled. Otherwise, DDS::InstanceHandle_t::HANDLE_NIL will be returned.

Parameters
instance_data<<in>> The instance that should be registered. Of this instance, only the fields that represent the key are examined by the function. Cannot be NULL.
source_timestamp<<in>> The timestamp value must be greater than or equal to the timestamp value used in the last writer operation (used in a register, unregister, dispose, or write, with either the automatically supplied timestamp or the application provided timestamp). This timestamp may potentially affect the order in which readers observe events from multiple writers. Cannot be NULL.
Returns
For keyed data type, return a handle that can be used in the calls that take a DDS::InstanceHandle_t, such as write, dispose, unregister_instance, or return DDS::InstanceHandle_t::HANDLE_NIL on failure. If the instance_data is of a data type that has no keys, this function always return DDS::InstanceHandle_t::HANDLE_NIL.
See Also
DDS::TypedDataWriter::unregister_instance, DDS::TypedDataWriter::get_key_value
template<typename T>
InstanceHandle_t DDS::TypedDataWriter< T >::register_instance_w_params ( instance_data,
DDS::WriteParams_t params 
)
inline

Performs the same function as DDS::TypedDataWriter::register_instance and DDS::TypedDataWriter::register_instance_w_timestamp except that it also provides the values contained in params.

See Also
DDS::TypedDataWriter::write_w_params
template<typename T>
void DDS::TypedDataWriter< T >::unregister_instance ( instance_data,
DDS::InstanceHandle_t handle 
)
inline

Reverses the action of DDS::TypedDataWriter::register_instance.

This operation is useful only for keyed data types. Using it for non-keyed types causes no effect and reports no error. The operation takes as a parameter an instance (of which only the key value is examined) and a handle.

This operation should only be called on an instance that is currently registered. This includes instances that have been auto-registered by calling operations such as write or dispose as described in DDS::TypedDataWriter::register_instance. Otherwise, this operation may fail with DDS::Retcode_BadParameter.

This only need be called just once per instance, regardless of how many times register_instance was called for that instance.

When this operation is used, RTI Connext will automatically supply the value of the source_timestamp that is used.

This operation informs RTI Connext that the DDS::DataWriter is no longer going to provide any information about the instance. This operation also indicates that RTI Connext can locally remove all information regarding that instance. The application should not attempt to use the handle previously allocated to that instance after calling DDS::TypedDataWriter::unregister_instance().

The special value DDS::InstanceHandle_t::HANDLE_NIL can be used for the parameter handle. This indicates that the identity of the instance should be automatically deduced from the instance_data (by means of the key).

If handle is any value other than DDS::InstanceHandle_t::HANDLE_NIL, then it must correspond to an instance that has been registered. If there is no correspondence, the operation will fail with DDS::Retcode_BadParameter.

RTI Connext will not detect the error when the handle is any value other than DDS::InstanceHandle_t::HANDLE_NIL, corresponds to an instance that has been registered, but does not correspond to the instance deduced from the instance_data (by means of the key). RTI Connext will treat as if the unregister_instance() operation is for the instance as indicated by the handle.

If, after a DDS::TypedDataWriter::unregister_instance, the application wants to modify (DDS::TypedDataWriter::write or DDS::TypedDataWriter::dispose) an instance, it has to register it again, or else use the special handle value DDS::InstanceHandle_t::HANDLE_NIL.

This operation does not indicate that the instance is deleted (that is the purpose of DDS::TypedDataWriter::dispose). The operation DDS::TypedDataWriter::unregister_instance just indicates that the DDS::DataWriter no longer has anything to say about the instance. DDS::DataReader entities that are reading the instance may receive a sample with DDS::InstanceStateKind::NOT_ALIVE_NO_WRITERS_INSTANCE_STATE for the instance, unless there are other DDS::DataWriter objects writing that same instance.

DDS::WriterDataLifecycleQosPolicy::autodispose_unregistered_instances controls whether instances are automatically disposed when they are unregistered.

This operation can affect the ownership of the data instance (see OWNERSHIP). If the DDS::DataWriter was the exclusive owner of the instance, then calling unregister_instance() will relinquish that ownership.

If DDS::ReliabilityQosPolicy::kind is set to ::DDS::ReliabilityQosPolicyKind::RELIABLE_RELIABILITY_QOS and the unregistration would overflow the resource limits of this writer or of a reader, this operation may block for up to DDS::ReliabilityQosPolicy::max_blocking_time; if this writer is still unable to unregister after that period, this method will fail with DDS::Retcode_Timeout.

Parameters
instance_data<<in>> The instance that should be unregistered. If Foo has a key and instance_handle is DDS::InstanceHandle_t::HANDLE_NIL, only the fields that represent the key are examined by the function. Otherwise, instance_data is not used. If instance_data is used, it must represent an instance that has been registerd. Otherwise, this method may fail with DDS::Retcode_BadParameter . If Foo has a key, instance_data can be NULL only if handle is not DDS::InstanceHandle_t::HANDLE_NIL. Otherwise, this method will fail with DDS::Retcode_BadParameter.
handle<<in>> represents the instance to be unregistered. If Foo has a key and handle is DDS::InstanceHandle_t::HANDLE_NIL, handle is not used and instance is deduced from instance_data. If Foo has no key, handle is not used. If handle is used, it must represent an instance that has been registered. Otherwise, this method may fail with DDS::Retcode_BadParameter. This method will fail with DDS::Retcode_BadParameter if handle is NULL. If Foo has a key, handle cannot be DDS::InstanceHandle_t::HANDLE_NIL if instance_data is NULL. Otherwise, this method will report the error DDS::Retcode_BadParameter.
Exceptions
Oneof the Standard Return Codes, DDS::Retcode_Timeout or DDS::Retcode_NotEnabled
See Also
DDS::TypedDataWriter::register_instance
DDS::TypedDataWriter::unregister_instance_w_timestamp
DDS::TypedDataWriter::get_key_value
Relationship between registration, liveliness and ownership The need for registering/unregistering instances stems from two use cases:
  • Ownership resolution on redundant systems
  • Detection of loss in topological connectivity
These two use cases also illustrate the semantic differences between the ::DDS::TypedDataWriter::unregister_instance and ::DDS::TypedDataWriter::dispose. BROKEN_SECTIONS
template<typename T>
void DDS::TypedDataWriter< T >::unregister_instance_w_timestamp ( instance_data,
DDS::InstanceHandle_t handle,
DDS::Time_t source_timestamp 
)
inline

Performs the same function as DDS::TypedDataWriter::unregister_instance except that it also provides the value for the source_timestamp.

The provided source_timestamp potentially affects the relative order in which readers observe events from multiple writers. Refer to DESTINATION_ORDER QoS policy for details.

The constraints on the values of the handle parameter and the corresponding error behavior are the same specified for the DDS::TypedDataWriter::unregister_instance operation.

This operation may block and may time out (DDS::Retcode_Timeout) under the same circumtances described for the unregister_instance operation.

Parameters
instance_data<<in>> The instance that should be unregistered. If Foo has a key and instance_handle is DDS::InstanceHandle_t::HANDLE_NIL, only the fields that represent the key are examined by the function. Otherwise, instance_data is not used. If instance_data is used, it must represent an instance that has been registerd. Otherwise, this method may fail with DDS::Retcode_BadParameter. If Foo has a key, instance_data can be NULL only if handle is not DDS::InstanceHandle_t::HANDLE_NIL. Otherwise, this method will fail with DDS::Retcode_BadParameter.
handle<<in>> represents the instance to be unregistered. If Foo has a key and handle is DDS::InstanceHandle_t::HANDLE_NIL, handle is not used and instance is deduced from instance_data. If Foo has no key, handle is not used. If handle is used, it must represent an instance that has been registered. Otherwise, this method may fail with DDS::Retcode_BadParameter. This method will fail with DDS::Retcode_BadParameter if handle is NULL. If Foo has a key, handle cannot be DDS::InstanceHandle_t::HANDLE_NIL if instance_data is NULL. Otherwise, this method will report the error DDS::Retcode_BadParameter.
source_timestamp<<in>> The timestamp value must be greater than or equal to the timestamp value used in the last writer operation (used in a register, unregister, dispose, or write, with either the automatically supplied timestamp or the application provided timestamp). This timestamp may potentially affect the order in which readers observe events from multiple writers. Cannot be NULL.
Exceptions
Oneof the Standard Return Codes, DDS::Retcode_Timeout or DDS::Retcode_NotEnabled.
See Also
DDS::TypedDataWriter::register_instance
DDS::TypedDataWriter::unregister_instance
DDS::TypedDataWriter::get_key_value
template<typename T>
void DDS::TypedDataWriter< T >::unregister_instance_w_params ( instance_data,
DDS::WriteParams_t params 
)
inline
template<typename T>
void DDS::TypedDataWriter< T >::write ( instance_data,
DDS::InstanceHandle_t handle 
)
inline

Modifies the value of a data instance.

When this operation is used, RTI Connext will automatically supply the value of the source_timestamp that is made available to DDS::DataReader objects by means of the source_timestamp attribute inside the DDS::SampleInfo. (Refer to DDS::SampleInfo and DESTINATION_ORDER QoS policy for details).

As a side effect, this operation asserts liveliness on the DDS::DataWriter itself, the DDS::Publisher and the DDS::DomainParticipant.

Note that the special value DDS::InstanceHandle_t::HANDLE_NIL can be used for the parameter handle. This indicates the identity of the instance should be automatically deduced from the instance_data (by means of the key).

If handle is any value other than DDS::InstanceHandle_t::HANDLE_NIL, then it must correspond to an instance that has been registered. If there is no correspondence, the operation will fail with DDS::Retcode_BadParameter.

RTI Connext will not detect the error when the handle is any value other than DDS::InstanceHandle_t::HANDLE_NIL, corresponds to an instance that has been registered, but does not correspond to the instance deduced from the instance_data (by means of the key). RTI Connext will treat as if the write() operation is for the instance as indicated by the handle.

This operation may block if the RELIABILITY kind is set to ::DDS::ReliabilityQosPolicyKind::RELIABLE_RELIABILITY_QOS and the modification would cause data to be lost or else cause one of the limits specified in the RESOURCE_LIMITS to be exceeded.

Specifically, this operation may block in the following situations (note that the list may not be exhaustive), even if its ::DDS::HistoryQosPolicyKind is ::DDS::HistoryQosPolicyKind::KEEP_LAST_HISTORY_QOS:

This operation may also block when using ::DDS::ReliabilityQosPolicyKind::BEST_EFFORT_RELIABILITY_QOS and ::DDS::PublishModeQosPolicyKind::ASYNCHRONOUS_PUBLISH_MODE_QOS. In this case, the DDS::DataWriter will queue samples until they are sent by the asynchronous publishing thread. The number of samples that can be stored is determined by the DDS::HistoryQosPolicy. If the asynchronous thread does not send samples fast enough (e.g., when using a slow DDS::FlowController), the queue may fill up. In that case, subsequent write calls will block.

If this operation does block for any of the above reasons, the RELIABILITY max_blocking_time configures the maximum time the write operation may block (waiting for space to become available). If max_blocking_time elapses before the DDS::DataWriter is able to store the modification without exceeding the limits, the operation will time out (DDS::Retcode_Timeout).

If there are no instance resources left, this operation may fail with DDS::Retcode_OutOfResources. Calling DDS::TypedDataWriter::unregister_instance may help freeing up some resources.

This operation will fail with DDS::Retcode_PreconditionNotMet if the timestamp is less than the timestamp used in the last writer operation (register, unregister, dispose, or write, with either the automatically supplied timestamp or the application-provided timestamp).

Parameters
instance_data<<in>> The data to write.

This method will fail with DDS::Retcode_BadParameter if instance_data is NULL.

Parameters
handle<<in>> Either the handle returned by a previous call to DDS::TypedDataWriter::register_instance, or else the special value DDS::InstanceHandle_t::HANDLE_NIL. If Foo has a key and handle is not DDS::InstanceHandle_t::HANDLE_NIL, handle must represent a registered instance of type Foo. Otherwise, this method may fail with DDS::Retcode_BadParameter. This method will fail with DDS::Retcode_BadParameter if handle is NULL.
Exceptions
Oneof the Standard Return Codes, DDS::Retcode_Timeout, DDS::Retcode_PreconditionNotMet, DDS::Retcode_OutOfResources, or DDS::Retcode_NotEnabled.
See Also
DDS::DataReader
DDS::TypedDataWriter::write_w_timestamp
DESTINATION_ORDER
template<typename T>
void DDS::TypedDataWriter< T >::write_w_timestamp ( instance_data,
DDS::InstanceHandle_t handle,
DDS::Time_t source_timestamp 
)
inline

Performs the same function as DDS::TypedDataWriter::write except that it also provides the value for the source_timestamp.

Explicitly provides the timestamp that will be available to the DDS::DataReader objects by means of the source_timestamp attribute inside the DDS::SampleInfo. (Refer to DDS::SampleInfo and DESTINATION_ORDER QoS policy for details)

The constraints on the values of the handle parameter and the corresponding error behavior are the same specified for the DDS::TypedDataWriter::write operation.

This operation may block and time out (DDS::Retcode_Timeout) under the same circumtances described for DDS::TypedDataWriter::write.

If there are no instance resources left, this operation may fail with DDS::Retcode_OutOfResources. Calling DDS::TypedDataWriter::unregister_instance may help free up some resources.

This operation may fail with DDS::Retcode_BadParameter under the same circumstances described for the write operation.

Parameters
instance_data<<in>> The data to write. This method will fail with DDS::Retcode_BadParameter if instance_data is NULL.
handle<<in>> Either the handle returned by a previous call to DDS::TypedDataWriter::register_instance, or else the special value DDS::InstanceHandle_t::HANDLE_NIL. If Foo has a key and handle is not DDS::InstanceHandle_t::HANDLE_NIL, handle must represent a registered instance of type Foo. Otherwise, this method may fail with DDS::Retcode_BadParameter. This method will fail with DDS::Retcode_BadParameter if handle is NULL.
source_timestamp<<in>> When using ::DDS::DestinationOrderQosPolicyKind::BY_SOURCE_TIMESTAMP_DESTINATIONORDER_QOS the timestamp value must be greater than or equal to the timestamp value used in the last writer operation (register, unregister, dispose, or write, with either the automatically supplied timestamp or the application-provided timestamp) However, if it is less than the timestamp of the previous operation but the difference is less than the DDS::DestinationOrderQosPolicy::source_timestamp_tolerance, the timestamp of the previous operation will be used as the source timestamp of this sample. Otherwise, if the difference is greater than DDS::DestinationOrderQosPolicy::source_timestamp_tolerance, the function will return DDS::Retcode_BadParameter.

Cannot be NULL.

Exceptions
Oneof the Standard Return Codes, DDS::Retcode_Timeout, DDS::Retcode_OutOfResources, or DDS::Retcode_NotEnabled.
See Also
DDS::TypedDataWriter::write
DDS::DataReader
DESTINATION_ORDER
template<typename T>
void DDS::TypedDataWriter< T >::write_w_params ( instance_data,
DDS::WriteParams_t params 
)
inline

Performs the same function as DDS::TypedDataWriter::write and DDS::TypedDataWriter::write_w_timestamp except that it also provides the values contained in params.

Allows provision of the sample identity, related sample identity, source timestamp, instance handle, and publication priority contained in params.

This operation may block and time out (DDS::Retcode_Timeout) under the same circumstances described for DDS::TypedDataWriter::write.

If there are no instance resources left, this operation may fail with DDS::Retcode_OutOfResources. Calling DDS::TypedDataWriter::unregister_instance_w_params may help free up some resources.

This operation may fail with DDS::Retcode_BadParameter under the same circumstances described for the DDS::TypedDataWriter::write.

Parameters
instance_data<<in>> The data to write. This method will fail with DDS::Retcode_BadParameter if instance_data is NULL.
params<<inout>> The write parameters. Note that this is an inout parameter if you activate DDS::WriteParams_t::replace_auto; otherwise it won't be modified. This method will fail with DDS::Retcode_BadParameter if params is NULL.
Exceptions
Oneof the Standard Return Codes, DDS::Retcode_Timeout, DDS::Retcode_OutOfResources or DDS::Retcode_NotEnabled.
See Also
DDS::TypedDataWriter::write
DDS::DataReader
template<typename T>
void DDS::TypedDataWriter< T >::dispose ( instance_data,
DDS::InstanceHandle_t instance_handle 
)
inline

Requests the middleware to delete the data.

This operation is useful only for keyed data types. Using it for non-keyed types has no effect and reports no error.

The actual deletion is postponed until there is no more use for that data in the whole system.

Applications are made aware of the deletion by means of operations on the DDS::DataReader objects that already knew that instance. DDS::DataReader objects that didn't know the instance will never see it.

This operation does not modify the value of the instance. The instance_data parameter is passed just for the purposes of identifying the instance.

When this operation is used, RTI Connext will automatically supply the value of the source_timestamp that is made available to DDS::DataReader objects by means of the source_timestamp attribute inside the DDS::SampleInfo.

The constraints on the values of the handle parameter and the corresponding error behavior are the same specified for the DDS::TypedDataWriter::unregister_instance operation.

The special value DDS::InstanceHandle_t::HANDLE_NIL can be used for the parameter instance_handle. This indicates the identity of the instance should be automatically deduced from the instance_data (by means of the key).

If handle is any value other than DDS::InstanceHandle_t::HANDLE_NIL, then it must correspond to an instance that has been registered. If there is no correspondence, the operation will fail with DDS::Retcode_BadParameter.

RTI Connext will not detect the error when the handle is any value other than DDS::InstanceHandle_t::HANDLE_NIL, corresponds to an instance that has been registered, but does not correspond to the instance deduced from the instance_data (by means of the key). RTI Connext will treat as if the dispose() operation is for the instance as indicated by the handle.

This operation may block and time out (DDS::Retcode_Timeout) under the same circumtances described for DDS::TypedDataWriter::write().

If there are no instance resources left, this operation may fail with DDS::Retcode_OutOfResources. Calling DDS::TypedDataWriter::unregister_instance may help freeing up some resources.

Parameters
instance_data<<in>> The data to dispose. If Foo has a key and instance_handle is DDS::InstanceHandle_t::HANDLE_NIL, only the fields that represent the key are examined by the function. Otherwise, instance_data is not used. If Foo has a key, instance_data can be NULL only if instance_handle is not DDS::InstanceHandle_t::HANDLE_NIL. Otherwise, this method will fail with DDS::Retcode_BadParameter.
instance_handle<<in>> Either the handle returned by a previous call to DDS::TypedDataWriter::register_instance, or else the special value DDS::InstanceHandle_t::HANDLE_NIL. If Foo has a key and instance_handle is DDS::InstanceHandle_t::HANDLE_NIL, instance_handle is not used and instance is deduced from instance_data. If Foo has no key, instance_handle is not used. If handle is used, it must represent a registered instance of type Foo. Otherwise, this method fail with DDS::Retcode_BadParameter. This method will fail with DDS::Retcode_BadParameter if handle is NULL. If Foo has a key, instance_handle cannot be DDS::InstanceHandle_t::HANDLE_NIL if instance_data is NULL. Otherwise, this method will fail with DDS::Retcode_BadParameter.
Exceptions
Oneof the Standard Return Codes, DDS::Retcode_Timeout, DDS::Retcode_OutOfResources or DDS::Retcode_NotEnabled.
See Also
DDS::TypedDataWriter::dispose_w_timestamp
Relationship between registration, liveliness and ownership The need for registering/unregistering instances stems from two use cases:
  • Ownership resolution on redundant systems
  • Detection of loss in topological connectivity
These two use cases also illustrate the semantic differences between the ::DDS::TypedDataWriter::unregister_instance and ::DDS::TypedDataWriter::dispose. BROKEN_SECTIONS
template<typename T>
void DDS::TypedDataWriter< T >::dispose_w_timestamp ( instance_data,
DDS::InstanceHandle_t instance_handle,
DDS::Time_t source_timestamp 
)
inline

Performs the same functions as dispose except that the application provides the value for the source_timestamp that is made available to DDS::DataReader objects by means of the source_timestamp attribute inside the DDS::SampleInfo.

The constraints on the values of the handle parameter and the corresponding error behavior are the same specified for the DDS::TypedDataWriter::dispose operation.

This operation may block and time out (DDS::Retcode_Timeout) under the same circumtances described for DDS::TypedDataWriter::write.

If there are no instance resources left, this operation may fail with DDS::Retcode_OutOfResources. Calling DDS::TypedDataWriter::unregister_instance may help freeing up some resources.

Parameters
instance_data<<in>> The data to dispose. If Foo has a key and instance_handle is DDS::InstanceHandle_t::HANDLE_NIL, only the fields that represent the key are examined by the function. Otherwise, instance_data is not used. If Foo has a key, instance_data can be NULL only if instance_handle is not DDS::InstanceHandle_t::HANDLE_NIL. Otherwise, this method will fail with DDS::Retcode_BadParameter.
handle<<in>> Either the handle returned by a previous call to DDS::TypedDataWriter::register_instance, or else the special value DDS::InstanceHandle_t::HANDLE_NIL. If Foo has a key and handle is not DDS::InstanceHandle_t::HANDLE_NIL, handle must represent a registered instance of type Foo. Otherwise, this method may fail with DDS::Retcode_BadParameter. This method will fail with DDS::Retcode_BadParameter if handle is NULL.
source_timestamp<<in>> The timestamp value must be greater than or equal to the timestamp value used in the last writer operation (used in a register, unregister, dispose, or write, with either the automatically supplied timestamp or the application provided timestamp). This timestamp may potentially affect the order in which readers observe events from multiple writers. This timestamp will be available to the DDS::DataReader objects by means of the source_timestamp attribute inside the DDS::SampleInfo. Cannot be NULL.
Exceptions
Oneof the Standard Return Codes, DDS::Retcode_Timeout, DDS::Retcode_OutOfResources or DDS::Retcode_NotEnabled.
See Also
DDS::TypedDataWriter::dispose
template<typename T>
void DDS::TypedDataWriter< T >::dispose_w_params ( instance_data,
DDS::WriteParams_t params 
)
inline

Performs the same function as DDS::TypedDataWriter::dispose and DDS::TypedDataWriter::dispose_w_timestamp except that it also provides the values contained in params.

See Also
DDS::TypedDataWriter::write_w_params
template<typename T>
void DDS::TypedDataWriter< T >::get_key_value ( key_holder,
DDS::InstanceHandle_t handle 
)
inline

Retrieve the instance key that corresponds to an instance handle.

Useful for keyed data types.

The operation will only fill the fields that form the key inside the key_holder instance. If Foo has no key, this method has no effect and exit with no error.

For keyed data types, this operation may fail with DDS::Retcode_BadParameter if the handle does not correspond to an existing data-object known to the DDS::DataWriter.

Parameters
key_holder<<inout>> a user data type specific key holder, whose key fields are filled by this operation. If Foo has no key, this method has no effect.

This method will fail with DDS::Retcode_BadParameter if key_holder is NULL.

Parameters
handle<<in>> the instance whose key is to be retrieved. If Foo has a key, handle must represent a registered instance of type Foo. Otherwise, this method will fail with DDS::Retcode_BadParameter. If Foo has a key and handle is DDS::InstanceHandle_t::HANDLE_NIL, this method will fail with DDS::Retcode_BadParameter. This method will fail with DDS::Retcode_BadParameter if handle is NULL.
Exceptions
Oneof the Standard Return Codes or DDS::Retcode_NotEnabled.
See Also
DDS::TypedDataReader::get_key_value
template<typename T>
InstanceHandle_t DDS::TypedDataWriter< T >::lookup_instance ( key_holder)
inline

Retrieve the instance handle that corresponds to an instance key_holder.

Useful for keyed data types.

This operation takes as a parameter an instance and returns a handle that can be used in subsequent operations that accept an instance handle as an argument. The instance parameter is only used for the purpose of examining the fields that define the key. This operation does not register the instance in question. If the instance has not been previously registered, or if for any other reason RTI Connext is unable to provide an instance handle, RTI Connext will return the special value HANDLE_NIL.

Parameters
key_holder<<in>> a user data type specific key holder.
Returns
the instance handle associated with this instance. If Foo has no key, this method has no effect and returns DDS::InstanceHandle_t::HANDLE_NIL

RTI Connext .Net APIs Version 5.2.0 Copyright © Sun Jun 21 2015 Real-Time Innovations, Inc