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use once_cell::sync::Lazy;
use super::*;
use std::collections::{BTreeMap, HashSet};
pub struct SecondaryMemtable {
/// Map of records indexed by key. The value is the set of primary key values of records
/// that have the secondary key value. The actual `Record` objects are stored in the
/// primary memtable, which acts as the shared heap.
records: BTreeMap<IndexableValue, LogKeySet>,
}
static EMPTY_SET: Lazy<HashSet<LogKey>> = Lazy::new(|| HashSet::new());
impl SecondaryMemtable {
pub fn new() -> SecondaryMemtable {
SecondaryMemtable {
records: BTreeMap::new(),
}
}
pub fn set(&mut self, key: &IndexableValue, value: &LogKey) {
match self.records.get_mut(key) {
Some(set) => {
set.insert(value.clone());
}
None => {
self.records
.insert(key.clone(), LogKeySet::new_with_initial(&value));
}
};
}
pub fn find_all(&self, key: &IndexableValue) -> &HashSet<LogKey> {
match self.records.get(key) {
Some(set) => set.log_keys(),
None => &EMPTY_SET,
}
}
// Remove all log keys associated with the given key
pub fn remove_all(&mut self, key: &IndexableValue) -> Option<LogKeySet> {
self.records.remove(key)
}
// Remove a single log key associated with the given key. Returns `true`
// if the log key existed and was removed, `false` otherwise.
pub fn remove(&mut self, key: &IndexableValue, log_key: &LogKey) -> bool {
let set = match self.records.get_mut(key) {
Some(set) => set,
None => return false,
};
if set.len() == 1 && set.contains(log_key) {
self.records.remove(key);
true
} else {
return match set.remove(log_key) {
Ok(_) => true,
Err(LogKeySetError::NotFoundError) => false,
Err(e) => panic!("{:?}", e),
};
}
}
// Remove all log keys associated with the given log key
// Note: This is a linear time operation, prefer using the `remove` method
// if you know the secondary key associated with the log key.
pub fn scan_remove(&mut self, log_key: &LogKey) -> u64 {
let mut removed = 0;
self.records.iter_mut().for_each(|(_, set)| {
if let Ok(_) = set.remove(&log_key) {
removed += 1;
}
});
removed
}
}
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