salsa/src/database_impl.rs
Lukas Wirth cfa88e9a4d
Move salsa event system into Zalsa (#849)
* Move salsa event system into `Zalsa`

* Encode `None` into ShallowUpdate

This shrinks the return value from 16 to 8 bytes
2025-05-07 11:45:49 +00:00

52 lines
1.2 KiB
Rust

use tracing::Level;
use crate::storage::HasStorage;
use crate::{Database, Storage};
/// Default database implementation that you can use if you don't
/// require any custom user data.
#[derive(Clone)]
pub struct DatabaseImpl {
storage: Storage<Self>,
}
impl Default for DatabaseImpl {
fn default() -> Self {
Self {
// Default behavior: tracing debug log the event.
storage: Storage::new(if tracing::enabled!(Level::DEBUG) {
Some(Box::new(|event| {
tracing::debug!("salsa_event({:?})", event)
}))
} else {
None
}),
}
}
}
impl DatabaseImpl {
/// Create a new database; equivalent to `Self::default`.
pub fn new() -> Self {
Self::default()
}
pub fn storage(&self) -> &Storage<Self> {
&self.storage
}
}
impl Database for DatabaseImpl {}
// SAFETY: The `storage` and `storage_mut` fields return a reference to the same storage field owned by `self`.
unsafe impl HasStorage for DatabaseImpl {
#[inline(always)]
fn storage(&self) -> &Storage<Self> {
&self.storage
}
#[inline(always)]
fn storage_mut(&mut self) -> &mut Storage<Self> {
&mut self.storage
}
}