Struct ChildTrackerBuilder 

pub struct ChildTrackerBuilder<'parent> { /* private fields */ }

Builder for creating child trackers with custom policies

Allows flexible customization of scheduling and error handling policies for child trackers while maintaining parent-child relationships.

Implementations

impl<'parent> ChildTrackerBuilder<'parent>

pub fn new(parent: &'parent TaskTracker) -> Self

Create a new ChildTrackerBuilder

pub fn scheduler(self, scheduler: Arc<dyn TaskScheduler>) -> Self

Set custom scheduler for the child tracker

If not set, the child will inherit the parent’s scheduler.

Arguments

• scheduler - The scheduler to use for this child tracker

Example

let child = parent.child_tracker_builder()
    .scheduler(SemaphoreScheduler::with_permits(5))
    .build().unwrap();

pub fn error_policy(self, error_policy: Arc<dyn OnErrorPolicy>) -> Self

Set custom error policy for the child tracker

If not set, the child will get a child policy from the parent’s error policy (via OnErrorPolicy::create_child()).

Arguments

• error_policy - The error policy to use for this child tracker

Example

let child = parent.child_tracker_builder()
    .error_policy(LogOnlyPolicy::new())
    .build().unwrap();

pub fn build(self) -> Result<TaskTracker>

Build the child tracker with the specified configuration

Creates a new child tracker with:

• Custom or inherited scheduler
• Custom or child error policy
• Hierarchical metrics that chain to parent
• Child cancellation token from the parent
• Independent lifecycle from parent

Returns

A new Arc<TaskTracker> configured as a child of the parent

Errors

Returns an error if the parent tracker is already closed