public eprosima::fastdds::dds::TopicDataType

Class Documentation

class FastDdsHoloscanEntityTypeSupport : public eprosima::fastdds::dds::TopicDataType

DDS TopicDataType implementation for HoloscanEntityData.

This class implements the FastDDS TopicDataType interface, enabling HoloscanEntityData to be used as a DDS topic type. It handles:

CDR serialization/deserialization using FastCDR
Memory management for data instances
Size calculation for DDS

Public Functions

FastDdsHoloscanEntityTypeSupport()

Construct a new FastDdsHoloscanEntityTypeSupport.

Sets the type name to “holoscan::Entity” and configures for variable-size data.

Uses a 1MB initial max_serialized_type_size for payload pool allocation. With FastDDS’s default PREALLOCATED_WITH_REALLOC_MEMORY_MODE, larger messages (10-100+ MB tensors) will trigger automatic reallocation. The actual size per message is determined by calculate_serialized_size().

Note

FastDDS 3.4.2 Bug: Documentation says to use 0 for unbounded types, but this causes a null pointer crash in TopicPayloadPoolProxy::reserve_history().

~FastDdsHoloscanEntityTypeSupport() override = default: Destructor.

FastDdsHoloscanEntityTypeSupport(const FastDdsHoloscanEntityTypeSupport&) = delete

FastDdsHoloscanEntityTypeSupport &operator=(const FastDdsHoloscanEntityTypeSupport&) = delete

FastDdsHoloscanEntityTypeSupport(FastDdsHoloscanEntityTypeSupport&&) = default

FastDdsHoloscanEntityTypeSupport &operator=(FastDdsHoloscanEntityTypeSupport&&) = default

bool serialize(const void *data, eprosima::fastdds::rtps::SerializedPayload_t &payload, eprosima::fastdds::dds::DataRepresentationId_t data_representation) override

Serialize HoloscanEntityData to CDR format.

Parameters

data – Pointer to HoloscanEntityData to serialize
payload – Output serialized payload
data_representation – Data representation (CDR encoding)

Returns

true on success, false on failure

bool deserialize(eprosima::fastdds::rtps::SerializedPayload_t &payload, void *data) override

Deserialize CDR format to HoloscanEntityData.

Parameters

payload – Input serialized payload
data – Pointer to HoloscanEntityData to populate

Returns

true on success, false on failure

uint32_t calculate_serialized_size(const void *data, eprosima::fastdds::dds::DataRepresentationId_t data_representation) override

Get the serialized size of a HoloscanEntityData instance.

Parameters

data – Pointer to HoloscanEntityData
data_representation – Data representation (CDR encoding)

Returns

Size in bytes when serialized

void *create_data() override

Create a new HoloscanEntityData instance.

Returns: Pointer to newly allocated HoloscanEntityData

void delete_data(void *data) override

Delete a HoloscanEntityData instance.

Parameters: data – Pointer to HoloscanEntityData to delete

bool compute_key(eprosima::fastdds::rtps::SerializedPayload_t &payload, eprosima::fastdds::rtps::InstanceHandle_t &handle, bool force_md5) override

Check if this type has a key.

HoloscanEntityData does not use keyed topics.

Returns: false (no key defined)

bool compute_key(const void *data, eprosima::fastdds::rtps::InstanceHandle_t &handle, bool force_md5) override

Get key from data.

Parameters

data – Pointer to data
handle – Output instance handle
force_md5 – Force MD5 computation

Returns

false (no key defined)

inline bool is_bounded() const override

Check if this type is bounded.

Returns: false (variable-size type with serialized_data vector)

inline bool is_plain(eprosima::fastdds::dds::DataRepresentationId_t) const override

Check if this type is plain (all members have fixed size and no optional).

Returns: false (contains variable-size vector and string)

Previous Class FastDdsEndpoint

Next Class FastDdsNativeBufferAdapter

Class FastDdsHoloscanEntityTypeSupport

Inheritance Relationships

Base Type

Class Documentation