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use quote::quote_spanned;
use super::{
DelayType, OpInstGenerics, OperatorCategory, OperatorConstraints, OperatorInstance,
OperatorWriteOutput, Persistence, RANGE_0, RANGE_1, WriteContextArgs,
};
use crate::diagnostic::{Diagnostic, Level};
/// `persist_mut()` is similar to `persist()` except that it also enables deletions.
/// `persist_mut()` expects an input of type [`Persistence<T>`](https://docs.rs/dfir_rs/latest/dfir_rs/util/enum.Persistence.html),
/// and it is this enumeration that enables the user to communicate deletion.
/// Deletions/persists happen in the order they are received in the stream.
/// For example, `[Persist(1), Delete(1), Persist(1)]` will result in a a single `1` value being stored.
///
/// ```dfir
/// use dfir_rs::util::Persistence;
///
/// source_iter([
/// Persistence::Persist(1),
/// Persistence::Persist(2),
/// Persistence::Delete(1),
/// ])
/// -> persist_mut::<'mutable>()
/// -> assert_eq([2]);
/// ```
pub const PERSIST_MUT: OperatorConstraints = OperatorConstraints {
name: "persist_mut",
categories: &[OperatorCategory::Persistence],
hard_range_inn: RANGE_1,
soft_range_inn: RANGE_1,
hard_range_out: RANGE_1,
soft_range_out: RANGE_1,
num_args: 0,
persistence_args: RANGE_1,
type_args: RANGE_0,
is_external_input: false,
// If this is set to true, the state will need to be cleared using `#context.set_state_lifespan_hook`
// to prevent reading uncleared data if this subgraph doesn't run.
// https://github.com/hydro-project/hydro/issues/1298
// If `'tick` lifetimes are added.
has_singleton_output: false,
flo_type: None,
ports_inn: None,
ports_out: None,
input_delaytype_fn: |_| Some(DelayType::Stratum),
write_fn: |wc @ &WriteContextArgs {
root,
context,
df_ident,
op_span,
work_fn_async,
ident,
inputs,
is_pull,
op_name,
op_inst:
OperatorInstance {
generics:
OpInstGenerics {
persistence_args, ..
},
..
},
..
},
diagnostics| {
assert!(is_pull);
if [Persistence::Mutable] != persistence_args[..] {
diagnostics.push(Diagnostic::spanned(
op_span,
Level::Error,
format!(
"{} only supports `'{}`.",
op_name,
Persistence::Mutable.to_str_lowercase()
),
));
}
let persistdata_ident = wc.make_ident("persistdata");
let vec_ident = wc.make_ident("persistvec");
let write_prologue = quote_spanned! {op_span=>
let #persistdata_ident = #df_ident.add_state(::std::cell::RefCell::new(
#root::util::sparse_vec::SparseVec::default(),
));
};
let write_iterator = {
let input = &inputs[0];
quote_spanned! {op_span=>
let mut #vec_ident = unsafe {
// SAFETY: handle from `#df_ident.add_state(..)`.
#context.state_ref_unchecked(#persistdata_ident)
}.borrow_mut();
let #ident = {
#[inline(always)]
fn check_pull<Prev, T: ::std::hash::Hash + ::std::cmp::Eq>(prev: Prev)
-> impl #root::dfir_pipes::pull::Pull<Item = #root::util::Persistence::<T>, Meta = Prev::Meta, CanPend = Prev::CanPend, CanEnd = Prev::CanEnd>
where
Prev: #root::dfir_pipes::pull::Pull<Item = #root::util::Persistence::<T>>
{
prev
}
let iter = if context.is_first_run_this_tick() {
let fut = #root::dfir_pipes::pull::Pull::for_each(check_pull(#input), |item| {
match item {
#root::util::Persistence::Persist(v) => #vec_ident.push(v),
#root::util::Persistence::Delete(v) => #vec_ident.delete(&v),
}
});
let () = #work_fn_async(fut).await;
Some(#vec_ident.iter().cloned()).into_iter().flatten()
} else {
None.into_iter().flatten()
};
#root::dfir_pipes::pull::iter(iter)
};
}
};
let write_iterator_after = quote_spanned! {op_span=>
#context.schedule_subgraph(#context.current_subgraph(), false);
};
Ok(OperatorWriteOutput {
write_prologue,
write_iterator,
write_iterator_after,
..Default::default()
})
},
};