# scheduler.rs - source
Source of the Rust file `maplibre/src/io/scheduler.rs`.

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    //! Scheduling.

    use std::future::Future;

    use thiserror::Error;

    #[derive(Error, Debug)]
    pub enum ScheduleError {
        #[error("scheduling work failed")]
        Scheduling(Box<dyn std::error::Error>),
        #[error("scheduler is not implemented on this platform")]
        NotImplemented,
    }

    /// Async/await scheduler.
    /// Can schedule a task from a future factory and a shared state.
    pub trait Scheduler: 'static {
        #[cfg(feature = "thread-safe-futures")]
        fn schedule<T>(
            &self,
            future_factory: impl (FnOnce() -> T) + Send + 'static,
        ) -> Result<(), ScheduleError>
        where
            T: Future<Output = ()> + Send + 'static;

        #[cfg(not(feature = "thread-safe-futures"))]
        fn schedule<T>(
            &self,
            future_factory: impl (FnOnce() -> T) + Send + 'static,
        ) -> Result<(), ScheduleError>
        where
            T: Future<Output = ()> + 'static;
    }

    pub struct NopScheduler;

    impl Scheduler for NopScheduler {
        fn schedule<T>(
            &self,
            _future_factory: impl FnOnce() -> T + Send + 'static,
        ) -> Result<(), ScheduleError>
        where
            T: Future<Output = ()> + 'static,
        {
            Err(ScheduleError::NotImplemented)
        }
    }