Struct DataType 

pub struct DataType { /* private fields */ }

Represents a data type including metadata.

Implementations

impl DataType

pub fn new( type_name: &str, metadata: Option<Params>, identifier: Option<String>, ) -> Self

Creates a new DataType instance.

pub fn from_parts( type_name: &str, topic: &str, metadata: Option<Params>, ) -> Self

Creates a DataType from persisted parts (type_name, topic, metadata). Hash is recomputed from topic. Use when restoring from legacy data_type column. Identifier is set to None.

pub fn to_persistence_json(&self) -> Result<String, Error>

Serializes to JSON for persistence (type_name, metadata, identifier; no topic, no hash).

Errors

Returns a JSON serialization error if the data cannot be serialized.

pub fn from_persistence_json(s: &str) -> Result<Self, Error>

Deserializes from JSON produced by to_persistence_json. Accepts legacy JSON with topic (ignored); topic is rebuilt from type_name + metadata.

Errors

Returns an error if the string is not valid JSON or missing required fields.

pub fn type_name(&self) -> &str

Returns the type name for the data type.

pub fn metadata(&self) -> Option<&Params>

Returns the metadata for the data type.

pub fn metadata_str(&self) -> String

Returns a string representation of the metadata.

pub fn metadata_string_map(&self) -> Option<HashMap<String, String>>

Returns metadata as a string-only map (e.g. for Arrow schema metadata).

pub fn precomputed_hash(&self) -> u64

Returns the precomputed hash for this data type.

pub fn topic(&self) -> &str

Returns the messaging topic for the data type.

pub fn identifier(&self) -> Option<&str>

Returns the optional catalog path identifier (can contain subdirs, e.g. "venue//symbol").

pub fn instrument_id(&self) -> Option<InstrumentId>

Returns an Option<InstrumentId> parsed from the metadata.

Panics

This function panics if:

• The instrument_id value contained in the metadata is invalid.

pub fn venue(&self) -> Option<Venue>

Returns an Option<Venue> parsed from the metadata.

Panics

This function panics if:

• The venue value contained in the metadata is invalid.

pub fn start(&self) -> Option<UnixNanos>

Returns an Option<UnixNanos> parsed from the metadata start field.

Panics

This function panics if:

• The start value contained in the metadata is invalid.

pub fn end(&self) -> Option<UnixNanos>

Returns an Option<UnixNanos> parsed from the metadata end field.

Panics

This function panics if:

• The end value contained in the metadata is invalid.

pub fn limit(&self) -> Option<usize>

Returns an Option<usize> parsed from the metadata limit field.

Panics

This function panics if:

• The limit value contained in the metadata is invalid.

Trait Implementations

impl Clone for DataType

fn clone(&self) -> DataType

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DataType

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for DataType

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for DataType

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for DataType

impl Hash for DataType

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for DataType

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for DataType

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for DataType

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for DataType

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.