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use std::fmt::Debug;

/// Defines a background job that can be queued and executed.
pub trait Job: Debug + Send + Sync + 'static {
    /// The output type of the job.
    type Output: Clone + Send + Sync + 'static;
    /// The error type of the job.
    type Error: Send + Sync + 'static;

    /// Executes the job and returns the result.
    fn execute(&mut self) -> Result<Self::Output, Self::Error>;
}

/// Defines a background job that has a unique `key`.
pub trait Keyed<Key>: Job
where
    Key: Clone + std::hash::Hash + Eq + Send + Sync + Debug + 'static,
{
    /// The unique `key` for this `Job`
    fn key(&self) -> Key;
}

pub trait Executable: Send + Sync + Debug {
    fn execute(&mut self);
}