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Labeler

treetop_core

Trait Labeler 

Source 
pub trait Labeler: Send + Sync {
    // Required methods
    fn applies_to(&self, kind: &str) -> bool;
    fn apply(&self, res: &mut Resource);
}
Expand description

Trait for objects that can label resources based on their attributes.

Implementations should be fast and side-effect free beyond mutating the provided Resource’s attributes. Repeated application must be safe and idempotent. A labeler owns the attributes it derives: it must replace or remove preexisting values instead of trusting caller-provided output.

Required Methods§

Source

fn applies_to(&self, kind: &str) -> bool

Returns true if this labeler applies to resources of the given kind.

e.g. “Host”, “Database::Table”; you can also support wildcard/globs if you want.

Source

fn apply(&self, res: &mut Resource)

Mutates the resource by injecting derived attributes (e.g., sets of labels).

Dyn Compatibility§

This trait is dyn compatible.

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

Implementors§