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Merge pull request #165 from azriel91/feature/164/add-item-stream-out…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| use fn_graph::StreamOutcomeState; | ||
| use peace_cfg::ItemId; | ||
|
|
||
| /// How a `Flow` stream operation ended and IDs that were processed. | ||
| /// | ||
| /// Currently this is constructed by `ItemStreamOutcomeMapper`. | ||
| #[derive(Clone, Debug, PartialEq, Eq)] | ||
| pub struct ItemStreamOutcome<T> { | ||
| /// The value of the outcome. | ||
| pub value: T, | ||
| /// How a `Flow` stream operation ended. | ||
| pub state: StreamOutcomeState, | ||
| /// IDs of the items that were processed. | ||
| pub item_ids_processed: Vec<ItemId>, | ||
| /// IDs of the items that were not processed. | ||
| pub item_ids_not_processed: Vec<ItemId>, | ||
| } | ||
|
|
||
| impl<T> ItemStreamOutcome<T> { | ||
| /// Returns an `ItemStreamOutcome` that is `Finished<T>`. | ||
| pub fn finished_with(value: T, item_ids_processed: Vec<ItemId>) -> Self { | ||
| Self { | ||
| value, | ||
| state: StreamOutcomeState::Finished, | ||
| item_ids_processed, | ||
| item_ids_not_processed: Vec::new(), | ||
| } | ||
| } | ||
|
|
||
| /// Maps this outcome's value to another. | ||
| pub fn map<TNew>(self, f: impl FnOnce(T) -> TNew) -> ItemStreamOutcome<TNew> { | ||
| let ItemStreamOutcome { | ||
| value, | ||
| state, | ||
| item_ids_processed, | ||
| item_ids_not_processed, | ||
| } = self; | ||
|
|
||
| let value = f(value); | ||
|
|
||
| ItemStreamOutcome { | ||
| value, | ||
| state, | ||
| item_ids_processed, | ||
| item_ids_not_processed, | ||
| } | ||
| } | ||
|
|
||
| /// Replaces the value from this outcome with another. | ||
| pub fn replace<TNew>(self, value_new: TNew) -> (ItemStreamOutcome<TNew>, T) { | ||
| let ItemStreamOutcome { | ||
| value: value_existing, | ||
| state, | ||
| item_ids_processed, | ||
| item_ids_not_processed, | ||
| } = self; | ||
|
|
||
| ( | ||
| ItemStreamOutcome { | ||
| value: value_new, | ||
| state, | ||
| item_ids_processed, | ||
| item_ids_not_processed, | ||
| }, | ||
| value_existing, | ||
| ) | ||
| } | ||
|
|
||
| /// Replaces the value from this outcome with another, taking the current | ||
| /// value as a parameter. | ||
| pub fn replace_with<TNew, U>( | ||
| self, | ||
| f: impl FnOnce(T) -> (TNew, U), | ||
| ) -> (ItemStreamOutcome<TNew>, U) { | ||
| let ItemStreamOutcome { | ||
| value, | ||
| state, | ||
| item_ids_processed, | ||
| item_ids_not_processed, | ||
| } = self; | ||
|
|
||
| let (value, extracted) = f(value); | ||
|
|
||
| ( | ||
| ItemStreamOutcome { | ||
| value, | ||
| state, | ||
| item_ids_processed, | ||
| item_ids_not_processed, | ||
| }, | ||
| extracted, | ||
| ) | ||
| } | ||
|
|
||
| pub fn into_value(self) -> T { | ||
| self.value | ||
| } | ||
|
|
||
| pub fn value(&self) -> &T { | ||
| &self.value | ||
| } | ||
|
|
||
| pub fn value_mut(&mut self) -> &mut T { | ||
| &mut self.value | ||
| } | ||
|
|
||
| pub fn state(&self) -> StreamOutcomeState { | ||
| self.state | ||
| } | ||
|
|
||
| pub fn item_ids_processed(&self) -> &[ItemId] { | ||
| self.item_ids_processed.as_ref() | ||
| } | ||
|
|
||
| pub fn item_ids_not_processed(&self) -> &[ItemId] { | ||
| self.item_ids_not_processed.as_ref() | ||
| } | ||
| } | ||
|
|
||
| impl<T> Default for ItemStreamOutcome<T> | ||
| where | ||
| T: Default, | ||
| { | ||
| fn default() -> Self { | ||
| Self { | ||
| value: T::default(), | ||
| state: StreamOutcomeState::NotStarted, | ||
| item_ids_processed: Vec::new(), | ||
| item_ids_not_processed: Vec::new(), | ||
| } | ||
| } | ||
| } |
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