Fail-safe file sequence

Implemented in Rust. Inspired by this Java implementation

Usage

let initial_value = 1;
let seq = FileSeq::new(store_dir, initial_value).unwrap();

// Get current value
seq.value().unwrap();

// Increment by 1 and get
seq.increment_and_get(1).unwrap();

// Get, then increment by 1
seq.get_and_increment(1).unwrap();

Changelog

0.2.0 (2020-09-07)

• Ignore errors on FileSeq::delete function #1

lib.rs:

Fail-safe file sequence

Works by versioning values of sequences and throwing away all versions, but the current and the previous one.

Inspired by this Java implementation

Usage

use file_seq::FileSeq;
use std::path::Path;

let dir = Path::new("/tmp/example");
let initial_value = 1;

let seq = FileSeq::new(&dir, initial_value).unwrap();

// Get current value
assert_eq!(initial_value, seq.value().unwrap());

// Increment and get
assert_eq!(initial_value + 1, seq.increment_and_get(1).unwrap());

// Get and then increment
assert_eq!(initial_value + 1, seq.get_and_increment(1).unwrap());
assert_eq!(initial_value + 2, seq.value().unwrap());