Struct AccessProvider 

pub struct AccessProvider {
    pub scheme: &'static str,
    pub open: fn(target: &str) -> Result<Box<dyn MetricAccess>, QueryError>,
}

A pluggable access backend, discovered at runtime via inventory. A consumer opens a service for a scheme-specific target (e.g. a db path). The sqlite reader registers one; future backends can too, without the query engine depending on them.

Fields

scheme: &'static str

The scheme this provider answers for (e.g. "sqlite").

open: fn(target: &str) -> Result<Box<dyn MetricAccess>, QueryError>

Open an access service for target (scheme-specific).

Trait Implementations

impl Collect for AccessProvider