Struct TraceScopeToken 

pub struct TraceScopeToken {
    pub parent: Option<Arc<TraceScopeToken>>,
    pub track: TraceNode,
    pub node_index: u64,
}

A persistent linked-list token for hierarchical trace context.

Each token holds the trace info for one graph node and an Arc pointer to its parent’s token. The full trace chain is only materialized when explicitly requested via [recover_trace_chain()], giving us zero-cost propagation during the flatten phase.

Fields

parent: Option<Arc<TraceScopeToken>>

Shared pointer to the parent scope (zero-copy link).

track: TraceNode

The trace metadata for this scope level.

node_index: u64

The item_index of the PlanItem that created this scope (for debugging).

Implementations

impl TraceScopeToken

pub fn recover_trace_chain(&self) -> Vec<TraceNode>

Lazily recover the full trace chain by walking the parent pointers. Only called when an event consumer actually needs the chain.

Trait Implementations

impl Clone for TraceScopeToken

fn clone(&self) -> TraceScopeToken

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TraceScopeToken

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

Formats the value using the given formatter.

impl PartialEq for TraceScopeToken

fn eq(&self, other: &TraceScopeToken) -> 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 StructuralPartialEq for TraceScopeToken