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,
    collections::HashMap,
    hash::{BuildHasherDefault, Hasher},
};

use crate::AnyClone;

pub(crate) type AnyMap =
    HashMap<TypeId, Box<dyn AnyClone + Send + Sync>, BuildHasherDefault<IdHasher>>;

// With TypeIds as keys, there's no need to hash them. They are already hashes
// themselves, coming from the compiler. The IdHasher just holds the u64 of
// the TypeId, and then returns it, instead of doing any bit fiddling.
#[derive(Default)]
pub(crate) struct IdHasher(u64);

impl Hasher for IdHasher {
    fn write(&mut self, _: &[u8]) {
        unreachable!("TypeId calls write_u64");
    }

    #[inline]
    fn write_u64(&mut self, id: u64) {
        self.0 = id;
    }

    #[inline]
    fn finish(&self) -> u64 {
        self.0
    }
}