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use crate::core::SegmentId;
use crate::core::SegmentMeta;
use crate::indexer::delete_queue::DeleteCursor;
use crate::indexer::segment_entry::SegmentEntry;
use std::collections::HashMap;
use std::collections::HashSet;
use std::fmt::{self, Debug, Formatter};
/// The segment register keeps track
/// of the list of segment, their size as well
/// as the state they are in.
///
/// It is consumed by indexes to get the list of
/// segments that are currently searchable,
/// and by the index merger to identify
/// merge candidates.
#[derive(Default)]
pub struct SegmentRegister {
segment_states: HashMap<SegmentId, SegmentEntry>,
}
impl Debug for SegmentRegister {
fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), fmt::Error> {
write!(f, "SegmentRegister(")?;
for k in self.segment_states.keys() {
write!(f, "{}, ", k.short_uuid_string())?;
}
write!(f, ")")?;
Ok(())
}
}
impl SegmentRegister {
pub fn clear(&mut self) {
self.segment_states.clear();
}
pub fn get_mergeable_segments(
&self,
in_merge_segment_ids: &HashSet<SegmentId>,
) -> Vec<SegmentMeta> {
self.segment_states
.values()
.filter(|segment_entry| !in_merge_segment_ids.contains(&segment_entry.segment_id()))
.map(|segment_entry| segment_entry.meta().clone())
.collect()
}
pub fn segment_entries(&self) -> Vec<SegmentEntry> {
self.segment_states.values().cloned().collect()
}
pub fn segment_metas(&self) -> Vec<SegmentMeta> {
let mut segment_ids: Vec<SegmentMeta> = self
.segment_states
.values()
.map(|segment_entry| segment_entry.meta().clone())
.collect();
segment_ids.sort_by_key(SegmentMeta::id);
segment_ids
}
pub fn contains_all(&self, segment_ids: &[SegmentId]) -> bool {
segment_ids
.iter()
.all(|segment_id| self.segment_states.contains_key(segment_id))
}
pub fn add_segment_entry(&mut self, segment_entry: SegmentEntry) {
let segment_id = segment_entry.segment_id();
self.segment_states.insert(segment_id, segment_entry);
}
pub fn remove_segment(&mut self, segment_id: &SegmentId) {
self.segment_states.remove(segment_id);
}
pub fn get(&self, segment_id: &SegmentId) -> Option<SegmentEntry> {
self.segment_states.get(segment_id).cloned()
}
pub fn new(segment_metas: Vec<SegmentMeta>, delete_cursor: &DeleteCursor) -> SegmentRegister {
let mut segment_states = HashMap::new();
for segment_meta in segment_metas {
let segment_id = segment_meta.id();
let segment_entry = SegmentEntry::new(segment_meta, delete_cursor.clone(), None);
segment_states.insert(segment_id, segment_entry);
}
SegmentRegister { segment_states }
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::core::{SegmentId, SegmentMetaInventory};
use crate::indexer::delete_queue::*;
fn segment_ids(segment_register: &SegmentRegister) -> Vec<SegmentId> {
segment_register
.segment_metas()
.into_iter()
.map(|segment_meta| segment_meta.id())
.collect()
}
#[test]
fn test_segment_register() {
let inventory = SegmentMetaInventory::default();
let delete_queue = DeleteQueue::new();
let mut segment_register = SegmentRegister::default();
let segment_id_a = SegmentId::generate_random();
let segment_id_b = SegmentId::generate_random();
let segment_id_merged = SegmentId::generate_random();
{
let segment_meta = inventory.new_segment_meta(segment_id_a, 0u32);
let segment_entry = SegmentEntry::new(segment_meta, delete_queue.cursor(), None);
segment_register.add_segment_entry(segment_entry);
}
assert_eq!(segment_ids(&segment_register), vec![segment_id_a]);
{
let segment_meta = inventory.new_segment_meta(segment_id_b, 0u32);
let segment_entry = SegmentEntry::new(segment_meta, delete_queue.cursor(), None);
segment_register.add_segment_entry(segment_entry);
}
segment_register.remove_segment(&segment_id_a);
segment_register.remove_segment(&segment_id_b);
{
let segment_meta_merged = inventory.new_segment_meta(segment_id_merged, 0u32);
let segment_entry = SegmentEntry::new(segment_meta_merged, delete_queue.cursor(), None);
segment_register.add_segment_entry(segment_entry);
}
assert_eq!(segment_ids(&segment_register), vec![segment_id_merged]);
}
}
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