Struct yeter::Database

pub struct Database { /* private fields */ }

The main type to interact with Yéter

This structure holds a list of registered queries and their respective caches.

Implementations

impl Database

pub fn new() -> Self

Creates an empty database

Examples found in repository

examples/basic.rs (line 8)

fn main() {
    let mut db = yeter::Database::new();
    db.register::<string::len::Query>(|_db, name| {
        dbg!(name.len())
    });
    let len1 = string::len::query(&db, "hello".into());
    let len2 = string::len::query(&db, "hello".into());
    let len3 = string::len::query(&db, "world".into());
    assert_eq!(len1, len2);
    assert_eq!(len1, len3);
}

examples/invalidation.rs (line 7)

fn main() {
    let mut db = yeter::Database::new();
    db.register::<list::Query>(|_db, ()| {
        vec![1, 2, 3]
    });
    db.register::<sum::Query>(|db, ()| {
        list::query(db, ()).iter().sum()
    });
    assert_eq!(*sum::query(&db, ()), 6);

    db.register::<list::Query>(|_db, ()| {
        vec![]
    });
    assert_eq!(*sum::query(&db, ()), 0);
}

pub fn register<Q>(&mut self, f: fn(_: &Self, _: Q::Input) -> Q::Output)where
Q: QueryDef,
Q::Output: 'static + Sync,

Registers a query

Examples found in repository

examples/basic.rs (lines 9-11)

fn main() {
    let mut db = yeter::Database::new();
    db.register::<string::len::Query>(|_db, name| {
        dbg!(name.len())
    });
    let len1 = string::len::query(&db, "hello".into());
    let len2 = string::len::query(&db, "hello".into());
    let len3 = string::len::query(&db, "world".into());
    assert_eq!(len1, len2);
    assert_eq!(len1, len3);
}

examples/invalidation.rs (lines 8-10)

fn main() {
    let mut db = yeter::Database::new();
    db.register::<list::Query>(|_db, ()| {
        vec![1, 2, 3]
    });
    db.register::<sum::Query>(|db, ()| {
        list::query(db, ()).iter().sum()
    });
    assert_eq!(*sum::query(&db, ()), 6);

    db.register::<list::Query>(|_db, ()| {
        vec![]
    });
    assert_eq!(*sum::query(&db, ()), 0);
}

pub fn run<I, O>(&self, q: &'static str, i: I) -> Rc<O>where
I: Hash,
O: 'static,

Runs a query (or not if it the result is already in the cache)

Trait Implementations

impl Default for Database

fn default() -> Database

Returns the “default value” for a type.