vecdb 0.10.2

High-performance mutable persistent vectors built on rawdb
Documentation 
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use std::{fs, path::Path};

use vecdb::{
    AnyStoredVec, AnyVec, Database, ImportableVec, PcoVec, ReadableVec, Stamp, Version, WritableVec,
};

#[allow(clippy::upper_case_acronyms)]
type VEC = PcoVec<usize, u32>;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let _ = fs::remove_dir_all("compressed");

    let version = Version::TWO;

    let database = Database::open(Path::new("compressed"))?;

    let options = (&database, "vec", version).into();

    {
        let mut vec: VEC = PcoVec::forced_import_with(options)?;

        (0..21_u32).for_each(|v| {
            vec.push(v);
        });

        assert_eq!(vec.collect_range(0, 1), vec![0]);
        assert_eq!(vec.collect_range(1, 2), vec![1]);
        assert_eq!(vec.collect_range(2, 3), vec![2]);
        assert_eq!(vec.collect_range(20, 21), vec![20]);
        assert!(vec.collect_range(21, 22).is_empty());

        vec.write()?;

        assert_eq!(vec.header().stamp(), Stamp::new(0));
    }

    {
        let mut vec: VEC = PcoVec::forced_import_with(options)?;

        vec.mut_header().update_stamp(Stamp::new(100));

        assert_eq!(vec.header().stamp(), Stamp::new(100));

        assert_eq!(vec.collect_range(0, 1), vec![0]);
        assert_eq!(vec.collect_range(1, 2), vec![1]);
        assert_eq!(vec.collect_range(2, 3), vec![2]);
        assert_eq!(vec.collect_range(3, 4), vec![3]);
        assert_eq!(vec.collect_range(4, 5), vec![4]);
        assert_eq!(vec.collect_range(5, 6), vec![5]);
        assert_eq!(vec.collect_range(20, 21), vec![20]);
        assert_eq!(vec.collect_range(0, 1), vec![0]);

        vec.push(21);
        vec.push(22);

        assert_eq!(vec.stored_len(), 21);
        assert_eq!(vec.pushed_len(), 2);
        assert_eq!(vec.len(), 23);

        assert_eq!(vec.collect_range(20, 21), vec![20]);
        assert_eq!(vec.collect_range(21, 22), vec![21]);
        assert_eq!(vec.collect_range(22, 23), vec![22]);
        assert!(vec.collect_range(23, 24).is_empty());

        vec.write()?;
    }

    {
        let mut vec: VEC = PcoVec::forced_import_with(options)?;

        assert_eq!(vec.header().stamp(), Stamp::new(100));

        assert_eq!(vec.stored_len(), 23);
        assert_eq!(vec.pushed_len(), 0);
        assert_eq!(vec.len(), 23);

        assert_eq!(vec.collect_range(0, 1), vec![0]);
        assert_eq!(vec.collect_range(20, 21), vec![20]);
        assert_eq!(vec.collect_range(21, 22), vec![21]);
        assert_eq!(vec.collect_range(22, 23), vec![22]);

        vec.truncate_if_needed(14)?;

        assert_eq!(vec.stored_len(), 14);
        assert_eq!(vec.pushed_len(), 0);
        assert_eq!(vec.len(), 14);

        assert_eq!(vec.collect_range(0, 1), vec![0]);
        assert_eq!(vec.collect_range(5, 6), vec![5]);
        assert!(vec.collect_range(20, 21).is_empty());

        assert_eq!(
            vec.collect_signed_range(Some(-5), None),
            vec![9, 10, 11, 12, 13]
        );

        vec.push(vec.len() as u32);
        let all = vec.collect();
        assert_eq!(*all.last().unwrap(), 14);

        vec.write()?;

        assert_eq!(
            vec.collect(),
            vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
        );
    }

    {
        let mut vec: VEC = PcoVec::forced_import_with(options)?;

        assert_eq!(
            vec.collect(),
            vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
        );

        assert_eq!(vec.collect_range(0, 1), vec![0]);
        assert_eq!(vec.collect_range(5, 6), vec![5]);
        assert!(vec.collect_range(20, 21).is_empty());

        assert_eq!(
            vec.collect_signed_range(Some(-5), None),
            vec![10, 11, 12, 13, 14]
        );

        vec.reset()?;

        assert_eq!(vec.pushed_len(), 0);
        assert_eq!(vec.stored_len(), 0);
        assert_eq!(vec.len(), 0);

        (0..21_u32).for_each(|v| {
            vec.push(v);
        });

        assert_eq!(vec.pushed_len(), 21);
        assert_eq!(vec.stored_len(), 0);
        assert_eq!(vec.len(), 21);

        assert_eq!(vec.collect_range(0, 1), vec![0]);
        assert_eq!(vec.collect_range(20, 21), vec![20]);
        assert!(vec.collect_range(21, 22).is_empty());

        vec.write()?;
    }

    {
        let mut vec: VEC = PcoVec::forced_import_with(options)?;

        assert_eq!(vec.pushed_len(), 0);
        assert_eq!(vec.stored_len(), 21);
        assert_eq!(vec.len(), 21);

        assert_eq!(vec.collect_range(0, 1), vec![0]);
        assert_eq!(vec.collect_range(10, 11), vec![10]);

        vec.write()?;
    }

    {
        let vec: VEC = PcoVec::forced_import_with(options)?;

        assert_eq!(
            vec.collect(),
            vec![
                0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
            ]
        );
    }

    Ok(())
}