l4l/queue-file

queue-file is a lightning-fast, transactional, file-based FIFO

queue-file

queue-file is a lightning-fast, transactional, file-based FIFO.

Addition and removal from an instance is an O(1) operation and is atomic. Writes are synchronous by default; data will be written to disk before an operation returns.

queue-file crate is a feature complete and binary compatible port of QueueFile class from Tape2 by Square, Inc. Check the original project here.

Documentation

Usage

To use queue-file, first add this to your Cargo.toml:

[dependencies]
queue-file = "1.1"

Then, add this to your crate root:

extern crate queue_file;

Example

extern crate queue_file;

use queue_file::QueueFile;

fn main() {
    let mut qf = QueueFile::open("example.qf")
        .expect("cannot open queue file");

    qf.add("ELEMENT #1".as_bytes()).expect("add failed");
    qf.add("ELEMENT #2".as_bytes()).expect("add failed");
    qf.add("ELEMENT #3".as_bytes()).expect("add failed");

    qf.remove().expect("remove failed");

    for (index, elem) in qf.iter().enumerate() {
        println!(
            "{}: {} bytes -> {}",
            index,
            elem.len(),
            std::str::from_utf8(&elem).unwrap_or("<invalid>")
        );
    }

    qf.clear().expect("clear failed");
}

License

This project is licensed under the Apache 2.0 license.