threshold

threshold-rs: threshold data structures in Rust!

Example

Assume multiset X is {10: 1, 8: 2, 6: 3, 5: 1}. This means that event 10 was seen once, event 8 twice, and so on.

Assume that these events come from vector clocks, and thus seeing event 10 means seeing all events from 1 to 10.

If, for example, we want the event that was seen at least 4 times (i.e. our threshold is 4), we should get event 6.

Assume threshold(u64, X) -> Option<u64> where the first argument is the threshold desired and the output the event that passes the threshold (in case there's one). Then:

• threshold(1, X) = Some(10)
• threshold(2, X) = Some(8)
• threshold(3, X) = Some(8)
• threshold(4, X) = Some(6)
• threshold(7, X) = Some(5)
• threshold(8, X) = None

Code Example

use threshold::{clock, *};

let vclock_0 = clock::vclock_from_seqs(vec![10, 5, 5]);
let vclock_1 = clock::vclock_from_seqs(vec![8, 10, 6]);
let vclock_2 = clock::vclock_from_seqs(vec![9, 8, 7]);

let mut tclock = TClock::new();
tclock.add(vclock_0);
tclock.add(vclock_1);
tclock.add(vclock_2);

let vclock_t1 = clock::vclock_from_seqs(vec![10, 10, 7]);
let vclock_t2 = clock::vclock_from_seqs(vec![9, 8, 6]);
let vclock_t3 = clock::vclock_from_seqs(vec![8, 5, 5]);

assert_eq!(tclock.threshold_union(1), vclock_t1);
assert_eq!(tclock.threshold_union(2), vclock_t2);
assert_eq!(tclock.threshold_union(3), vclock_t3);

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.