0.1.0 |
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#107 in #complex
13KB
276 lines
DiskMap
Concurrent shared HashMap based on disk.
To allow concurred shared access to data every key is behind a
RwLock
handled by the filesystem.
Usage
simple example
fn main() {
let d: DiskMap<String, i32> = DiskMap::open_new("/tmp/db").unwrap();
d.insert("a".to_owned(), 12000).unwrap();
d.insert("b".to_owned(), 2).unwrap();
d.insert("c".to_owned(), 3).unwrap();
d.alter(&"a".to_owned(), |_| 1).unwrap();
let v = d.get(&"a".to_owned()).unwrap();
assert_eq!(v, 1);
}
complex example
fn main() {
let d: DiskMap<String, i32> = DiskMap::open_new("/tmp/db").unwrap();
d.insert("a".to_owned(), 1).unwrap();
d.insert("b".to_owned(), 2).unwrap();
d.insert("c".to_owned(), 3).unwrap();
let d1 = d.clone();
thread::spawn(move || loop {
let keys = d1.get_keys().unwrap();
keys.iter().for_each(|e_ref| {
d1.alter(e_ref, |_| 11).unwrap();
});
});
let d2 = d.clone();
thread::spawn(move || loop {
let keys = d2.get_keys().unwrap();
keys.iter().for_each(|e_ref| {
d2.alter(e_ref, |_| 11).unwrap();
});
});
// the two threads are accessing the same key and modifying the value without
// one colliding with the other
}
Dependencies
~0.8–1.6MB
~32K SLoC