trace_block

datafusion_common_runtime

Function trace_block 

Source 
pub fn trace_block<T, F>(f: F) -> Box<dyn FnOnce() -> T + Send>
where
    F: FnOnce() -> T + Send + 'static,
    T: Send + 'static,
Expand description

Optionally instruments a blocking closure with custom tracing.

If a tracer has been injected via set_tracer, the closure is wrapped so that its return value is boxed (erasing its type), passed to the tracer, and then the result is downcast back to the original type. If no tracer is set, the closure is returned unmodified (except for being boxed).

§Type Parameters

  • T - The concrete return type of the closure.
  • F - The closure type.

§Parameters

  • f - The blocking closure to potentially instrument.