Struct Subject 

pub struct Subject { /* private fields */ }

A structured subject made of typed Segments.

A subject can be concrete (no wildcards) or a pattern (with * and/or >). The wire format is bincode-encoded bytes.

// Concrete:
let s = Subject::new().str("job").int(42).str("logs");
assert_eq!(s.to_string(), "job.42.logs");

// Pattern:
let p = Subject::new().str("job").any().str("logs");
assert_eq!(p.to_string(), "job.*.logs");

// Roundtrip through bytes:
let bytes = s.to_bytes();
let s2 = Subject::from_bytes(&bytes).unwrap();
assert_eq!(s, s2);

Implementations

impl Subject

pub fn new() -> Self

Create an empty subject.

pub fn str(self, s: impl Into<String>) -> Self

Append a string segment.

Panics

Panics if the string is empty, contains reserved characters, or if the subject already ends with >.

pub fn int(self, v: i64) -> Self

Append an integer segment.

Panics

Panics if the subject already ends with >.

pub fn any(self) -> Self

Append a single-segment wildcard (*).

Panics

Panics if the subject already ends with >.

pub fn rest(self) -> Self

Append a multi-segment wildcard (>). Must be the last segment.

Panics

Panics if > already exists in the subject.

pub fn segment(self, seg: Segment) -> Self

Append a raw Segment.

Panics

Panics if the subject already ends with >.

pub fn segments(&self) -> &[Segment]

Access the inner segments.

pub fn len(&self) -> usize

Number of segments.

pub fn is_empty(&self) -> bool

Whether the subject is empty.

pub fn is_concrete(&self) -> bool

true if the subject contains no wildcards.

Concrete subjects enable fast-path exact-match routing in the broker.

pub fn is_pattern(&self) -> bool

true if the subject contains any wildcard segment.

pub fn matches(&self, concrete: &Subject) -> bool

Test whether a concrete subject matches this pattern.

If self is concrete, this is an equality check.

pub fn to_bytes(&self) -> Vec<u8>

Serialize to bincode bytes (wire format).

pub fn from_bytes(bytes: &[u8]) -> Result<Self, DecodeError>

Deserialize from bincode bytes.

pub fn from_module_path(module_path: &str, type_name: &str) -> Self

Build a Subject from module_path!() and a type name.

Splits the module path on :: and appends each part as a string segment, then appends the type name.

Trait Implementations

impl Clone for Subject

fn clone(&self) -> Subject

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Subject

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

Formats the value using the given formatter.

impl Default for Subject

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Subject

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Subject

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

Dot-separated representation: job.42.logs, job.*.>.

impl From<&str> for Subject

fn from(s: &str) -> Self

Parse a dot-separated string. * becomes Segment::Any, > becomes Segment::Rest, integers become Segment::Int, everything else is Segment::Str.

impl Hash for Subject

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 PartialEq for Subject

fn eq(&self, other: &Subject) -> 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 Serialize for Subject

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Subject

impl StructuralPartialEq for Subject