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use crate::chunkid::ChunkId;
use std::collections::HashMap;
use std::default::Default;
/// A chunk index.
///
/// A chunk index lets the server quickly find chunks based on a
/// string key/value pair, or whether they are generations.
#[derive(Debug, Default)]
pub struct Index {
map: HashMap<(String, String), Vec<ChunkId>>,
generations: Vec<ChunkId>,
}
impl Index {
pub fn is_empty(&self) -> bool {
self.len() == 0
}
pub fn len(&self) -> usize {
self.map.len()
}
pub fn insert(&mut self, id: ChunkId, key: &str, value: &str) {
let kv = kv(key, value);
if let Some(v) = self.map.get_mut(&kv) {
v.push(id)
} else {
self.map.insert(kv, vec![id]);
}
}
pub fn find(&self, key: &str, value: &str) -> Vec<ChunkId> {
let kv = kv(key, value);
if let Some(v) = self.map.get(&kv) {
v.clone()
} else {
vec![]
}
}
pub fn insert_generation(&mut self, id: ChunkId) {
self.generations.push(id)
}
pub fn find_generations(&self) -> Vec<ChunkId> {
self.generations.clone()
}
}
fn kv(key: &str, value: &str) -> (String, String) {
(key.to_string(), value.to_string())
}
#[cfg(test)]
mod test {
use super::{ChunkId, Index};
#[test]
fn is_empty_initially() {
let idx = Index::default();
assert!(idx.is_empty());
}
#[test]
fn remembers_inserted() {
let id: ChunkId = "id001".parse().unwrap();
let mut idx = Index::default();
idx.insert(id.clone(), "sha256", "abc");
assert!(!idx.is_empty());
assert_eq!(idx.len(), 1);
let ids: Vec<ChunkId> = idx.find("sha256", "abc");
assert_eq!(ids, vec![id]);
}
#[test]
fn does_not_find_uninserted() {
let id: ChunkId = "id001".parse().unwrap();
let mut idx = Index::default();
idx.insert(id, "sha256", "abc");
assert_eq!(idx.find("sha256", "def").len(), 0)
}
#[test]
fn has_no_generations_initially() {
let idx = Index::default();
assert_eq!(idx.find_generations(), vec![]);
}
#[test]
fn remembers_generation() {
let id: ChunkId = "id001".parse().unwrap();
let mut idx = Index::default();
idx.insert_generation(id.clone());
assert_eq!(idx.find_generations(), vec![id]);
}
}
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