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Under this design, *all* databases are a `DatabaseImpl<U>`, where the `U` implements `UserData` (you can use `()` if there is none). Code would default to `&dyn salsa::Database` but if you want to give access to the userdata, you can define a custom database trait `MyDatabase: salsa::Databse` so long as you * annotate `MyDatabase` trait definition of impls of `MyDatabase` with `#[salsa::db]` * implement `MyDatabase` for `DatabaseImpl<U>` where `U` is your userdata (this could be a blanket impl, if you don't know the precise userdata type). The `tests/common/mod.rs` shows the pattern.
64 lines
1.4 KiB
Rust
64 lines
1.4 KiB
Rust
//! Demonstrates that accumulation is done in the order
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//! in which things were originally executed.
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mod common;
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use expect_test::expect;
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use salsa::{Accumulator, Database};
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use test_log::test;
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#[salsa::accumulator]
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struct Log(#[allow(dead_code)] String);
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#[salsa::tracked]
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fn push_logs(db: &dyn Database) {
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push_a_logs(db);
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}
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#[salsa::tracked]
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fn push_a_logs(db: &dyn Database) {
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Log("log a".to_string()).accumulate(db);
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push_b_logs(db);
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push_c_logs(db);
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push_d_logs(db);
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}
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#[salsa::tracked]
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fn push_b_logs(db: &dyn Database) {
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Log("log b".to_string()).accumulate(db);
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push_d_logs(db);
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}
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#[salsa::tracked]
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fn push_c_logs(db: &dyn Database) {
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Log("log c".to_string()).accumulate(db);
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}
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#[salsa::tracked]
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fn push_d_logs(db: &dyn Database) {
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Log("log d".to_string()).accumulate(db);
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}
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#[test]
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fn accumulate_execution_order() {
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salsa::DatabaseImpl::new().attach(|db| {
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let logs = push_logs::accumulated::<Log>(db);
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// Check that we get logs in execution order
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expect![[r#"
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[
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Log(
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"log a",
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),
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Log(
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"log b",
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),
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Log(
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"log d",
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),
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Log(
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"log c",
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),
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]"#]]
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.assert_eq(&format!("{:#?}", logs));
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})
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}
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