heap_test.rs

extern crate rocksdb;

use rocksdb::{DB, Options, SliceTransform};

use std::alloc::System;

#[global_allocator]
static A: System = System;

fn main() {
    let mut opts = Options::default();
    opts.create_if_missing(true);
    let slice_transform = SliceTransform::create("slice", transform, Some(in_domain));
    opts.set_prefix_extractor(slice_transform);
    let db = DB::open(&opts, "rocksdb.db").unwrap();
    for i in 0..100000 {
        let key = format!("{}this is a long key", i);
        db.put(&key, b"this is a value").unwrap();
        let iter = db.prefix_iterator(key);
        if i % 1000 == 0 {
            println!("items: {:?}", iter.collect::<Vec<_>>().len());
        }
    }
}

fn in_domain(_: &[u8]) -> bool {
    true
}

fn transform<'a>(key: &'a [u8]) -> &'a [u8] {
    key
}