Trait ExecutionMonitor 

pub trait ExecutionMonitor: Send + Sync {
    // Provided methods
    fn pre_execute(&self, _task: TaskId, _at: Instant) { ... }
    fn post_execute(
        &self,
        _task: TaskId,
        _at: Instant,
        _took: Duration,
        _ok: bool,
    ) { ... }
}

Hook invoked before and after every execute call. Defaults are no-ops.

Why two hooks?

This is the per-execute timing hook: it fires on the dispatch hot path around every single item invocation, so implementations must stay cheap. For coarse lifecycle events (executor up/down, app start/stop, faults, user events) — which fire rarely and can afford more work — use crate::Observer instead.

Provided Methods

fn pre_execute(&self, _task: TaskId, _at: Instant)

Called immediately before an item’s execute() is invoked.

fn post_execute(&self, _task: TaskId, _at: Instant, _took: Duration, _ok: bool)

Called immediately after execute() returns. ok is false if the item returned Err (or panicked).

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors