graphile_worker_extensions 0.1.8

Extensions package for graphile_worker, a high performance Rust/PostgreSQL job queue
Documentation 
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use std::any::TypeId;

use super::Extensions;

impl Extensions {
    /// Get a reference to a type previously inserted on this `Extensions`.
    ///
    /// # Example
    ///
    /// ```
    /// use graphile_worker_extensions::Extensions;
    /// let mut ext = Extensions::new();
    /// assert!(ext.get::<i32>().is_none());
    /// ext.insert(5i32);
    ///
    /// assert_eq!(ext.get::<i32>(), Some(&5i32));
    /// ```
    pub fn get<T: Send + Sync + 'static>(&self) -> Option<&T> {
        self.map
            .as_ref()
            .and_then(|map| map.get(&TypeId::of::<T>()))
            .and_then(|boxed| (**boxed).as_any().downcast_ref())
    }

    /// Check whether the extension set is empty or not.
    ///
    /// # Example
    ///
    /// ```
    /// use graphile_worker_extensions::Extensions;
    /// let mut ext = Extensions::new();
    /// assert!(ext.is_empty());
    /// ext.insert(5i32);
    /// assert!(!ext.is_empty());
    /// ```
    #[inline]
    pub fn is_empty(&self) -> bool {
        self.map.as_ref().is_none_or(|map| map.is_empty())
    }

    /// Get the numer of extensions available.
    ///
    /// # Example
    ///
    /// ```
    /// use graphile_worker_extensions::Extensions;
    /// let mut ext = Extensions::new();
    /// assert_eq!(ext.len(), 0);
    /// ext.insert(5i32);
    /// assert_eq!(ext.len(), 1);
    /// ```
    #[inline]
    pub fn len(&self) -> usize {
        self.map.as_ref().map_or(0, |map| map.len())
    }
}