Struct SessionId 

pub struct SessionId(/* private fields */);

Session identifier value object for type-safe session management

This value object provides type-safe session identification with session lifecycle management, security context tracking, and comprehensive validation capabilities. It implements Domain-Driven Design (DDD) value object patterns with immutable semantics and session-specific features.

Key Features

• Type Safety: Strongly-typed session identifiers that cannot be confused with other IDs
• Session Lifecycle: ULID-based time-ordered creation sequence for session tracking
• Security Context: Natural chronological ordering for audit trails and security tracking
• Cross-Platform: Consistent representation across languages and storage systems
• Session Validation: Comprehensive session-specific validation with expiration management
• Serialization: Full serialization support for storage and API integration

Benefits Over Raw ULIDs

• Type Safety: SessionId cannot be confused with PipelineId or other entity IDs
• Domain Semantics: Clear intent in function signatures and session business logic
• Session Validation: Session-specific validation rules with expiration and constraints
• Future Evolution: Extensible for session-specific methods and features

Session Management Benefits

• Audit Trails: Natural time ordering for session events and security tracking
• Uniqueness: ULID guarantees global uniqueness across distributed systems
• Traceability: Easy tracking of session lifecycles and state changes
• Type Safety: Cannot be confused with other ID types in complex session workflows
• Expiration: Built-in expiration validation with configurable timeout periods

Usage Examples

Cross-Language Mapping

• Rust: SessionId newtype wrapper with full validation
• Go: SessionID struct with equivalent interface
• JSON: String representation of ULID for API compatibility
• Database: TEXT column with ULID string storage

Implementations

impl SessionId

pub fn new() -> Self

Creates a new session ID with current timestamp

Purpose

Generates a unique, time-ordered session identifier using ULID. Each session ID captures the exact moment of session creation.

Why

Time-ordered session IDs provide:

• Natural chronological sorting for session tracking
• Built-in creation timestamp for expiration checks
• Guaranteed uniqueness across distributed systems
• Audit trail support without additional timestamps

Returns

New SessionId with current millisecond timestamp

Examples

pub fn from_ulid(ulid: Ulid) -> Result<Self, PipelineError>

Creates a session ID from an existing ULID

pub fn from_string(s: &str) -> Result<Self, PipelineError>

Creates a session ID from a string representation

pub fn from_timestamp_ms(timestamp_ms: u64) -> Self

Creates a session ID from a timestamp (for testing/migration)

pub fn as_ulid(&self) -> Ulid

Gets the underlying ULID value

pub fn timestamp_ms(&self) -> u64

Gets the timestamp component

pub fn datetime(&self) -> DateTime<Utc>

Gets the creation time as a DateTime

pub fn category(&self) -> &'static str

Gets the ID category

pub fn validate(&self) -> Result<(), PipelineError>

Validates the session ID using category-specific rules

pub fn is_nil(&self) -> bool

Checks if this is a nil session ID

pub fn is_expired(&self, timeout_minutes: u64) -> bool

Checks if the session is expired based on timeout

pub fn age_minutes(&self) -> i64

Gets the session age in minutes

Trait Implementations

impl AsRef<Ulid> for SessionId

fn as_ref(&self) -> &Ulid

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for SessionId

fn clone(&self) -> SessionId

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SessionId

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

Formats the value using the given formatter.

impl Default for SessionId

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SessionId

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for SessionId

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

Formats the value using the given formatter.

impl From<SessionId> for Ulid

fn from(id: SessionId) -> Self

Converts to this type from the input type.

impl From<Ulid> for SessionId

fn from(ulid: Ulid) -> Self

Converts to this type from the input type.

impl FromStr for SessionId

type Err = PipelineError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for SessionId

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 SessionId

fn cmp(&self, other: &SessionId) -> 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 SessionId

fn eq(&self, other: &SessionId) -> 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 SessionId

fn partial_cmp(&self, other: &SessionId) -> 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 SessionId

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 SessionId

impl StructuralPartialEq for SessionId