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| // Copyright (C) 2024 Quickwit, Inc. | ||
| // | ||
| // Quickwit is offered under the AGPL v3.0 and as commercial software. | ||
| // For commercial licensing, contact us at hello@quickwit.io. | ||
| // | ||
| // AGPL: | ||
| // This program is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Affero General Public License as | ||
| // published by the Free Software Foundation, either version 3 of the | ||
| // License, or (at your option) any later version. | ||
| // | ||
| // This program is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Affero General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Affero General Public License | ||
| // along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| use std::collections::LinkedList; | ||
| use std::sync::Weak; | ||
|
|
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| pub trait Container<T> { | ||
| fn contains(&self, other: &T) -> bool; | ||
| } | ||
|
|
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| /// Data structure for checking if a given value is still present in a set of | ||
| /// weakly referenced containers (e.g arrays). | ||
| /// | ||
| /// Each time a lookup is performed, all inactive references are removed. | ||
| /// Lookups are O(number of referenced containers). | ||
| pub struct RefTracker<C, T> { | ||
| refs: LinkedList<Weak<C>>, | ||
| _marker: std::marker::PhantomData<T>, | ||
| } | ||
|
|
||
| impl<C, T> Default for RefTracker<C, T> { | ||
| fn default() -> Self { | ||
| RefTracker { | ||
| refs: LinkedList::new(), | ||
| _marker: std::marker::PhantomData, | ||
| } | ||
| } | ||
| } | ||
|
|
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| impl<C: Container<T>, T> RefTracker<C, T> { | ||
| pub fn add(&mut self, weak: Weak<C>) { | ||
| self.refs.push_back(weak); | ||
| } | ||
|
|
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| pub fn contains(&mut self, value: &T) -> bool { | ||
| // TODO replace impl with `LinkedList::retain` when stabilized | ||
| let mut new_refs = LinkedList::new(); | ||
| let mut value_found = false; | ||
| while let Some(weak) = self.refs.pop_front() { | ||
| if let Some(ingester_ids) = weak.upgrade() { | ||
| if !value_found && ingester_ids.contains(value) { | ||
| value_found = true; | ||
| } | ||
| new_refs.push_back(weak); | ||
| } | ||
| } | ||
| self.refs = new_refs; | ||
| value_found | ||
| } | ||
| } | ||
|
|
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| impl<T: PartialEq> Container<T> for Vec<T> { | ||
| fn contains(&self, other: &T) -> bool { | ||
| self[..].contains(other) | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use std::sync::Arc; | ||
|
|
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| use super::*; | ||
|
|
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| #[test] | ||
| fn test_add_and_contains() { | ||
| let mut ref_tracker = RefTracker::default(); | ||
| let container = Arc::new(vec![1, 2, 3]); | ||
| let weak_container = Arc::downgrade(&container); | ||
|
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| ref_tracker.add(weak_container); | ||
| assert!(ref_tracker.contains(&2)); | ||
| assert!(!ref_tracker.contains(&4)); | ||
| } | ||
|
|
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| #[test] | ||
| fn test_contains_with_dropped_reference() { | ||
| let mut ref_tracker = RefTracker::default(); | ||
| let container = Arc::new(vec![1, 2, 3]); | ||
| let weak_container = Arc::downgrade(&container); | ||
|
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| ref_tracker.add(weak_container); | ||
| drop(container); | ||
|
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| assert!(!ref_tracker.contains(&2)); | ||
| assert!(ref_tracker.refs.is_empty()); | ||
| } | ||
|
|
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| #[test] | ||
| fn test_multiple_references() { | ||
| let mut ref_tracker = RefTracker::default(); | ||
| let container1 = Arc::new(vec![1, 2, 3]); | ||
| let container2 = Arc::new(vec![4, 5, 6]); | ||
| let weak_container1 = Arc::downgrade(&container1); | ||
| let weak_container2 = Arc::downgrade(&container2); | ||
|
|
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| ref_tracker.add(weak_container1); | ||
| ref_tracker.add(weak_container2); | ||
|
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| assert!(ref_tracker.contains(&2)); | ||
| assert!(ref_tracker.contains(&5)); | ||
| assert!(!ref_tracker.contains(&7)); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_empty_tracker() { | ||
| let mut ref_tracker: RefTracker<Vec<_>, i32> = RefTracker::default(); | ||
| assert!(!ref_tracker.contains(&1)); | ||
| } | ||
| } |
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