Introduce a new Sorter Cache for CboRoaringBitmaps

milli/src/update/index_documents/cache.rs

@@ -0,0 +1,138 @@
+use std::borrow::Cow;
+use std::mem;
+use std::num::NonZeroUsize;
+
+use lru::LruCache;
+use roaring::RoaringBitmap;
+use smallvec::SmallVec;
+
+use crate::update::del_add::{DelAdd, KvWriterDelAdd};
+use crate::CboRoaringBitmapCodec;
+
+pub struct SorterCacheDelAddCboRoaringBitmap<const N: usize, MF> {
+    cache: LruCache<SmallVec<[u8; N]>, DelAddRoaringBitmap>,
+    sorter: grenad::Sorter<MF>,
+    deladd_buffer: Vec<u8>,
+    cbo_buffer: Vec<u8>,
+    conn: redis::Connection,
+}
+
+impl<const N: usize, MF> SorterCacheDelAddCboRoaringBitmap<N, MF> {
+    pub fn new(cap: NonZeroUsize, sorter: grenad::Sorter<MF>, conn: redis::Connection) -> Self {
+        SorterCacheDelAddCboRoaringBitmap {
+            cache: LruCache::new(cap),
+            sorter,
+            deladd_buffer: Vec::new(),
+            cbo_buffer: Vec::new(),
+            conn,
+        }
+    }
+}
+
+impl<const N: usize, MF, U> SorterCacheDelAddCboRoaringBitmap<N, MF>
+where
+    MF: for<'a> Fn(&[u8], &[Cow<'a, [u8]>]) -> Result<Cow<'a, [u8]>, U>,
+{
+    pub fn insert_del_u32(&mut self, key: &[u8], n: u32) -> Result<(), grenad::Error<U>> {
+        match self.cache.get_mut(key) {
+            Some(DelAddRoaringBitmap { del, add: _ }) => {
+                del.get_or_insert_with(RoaringBitmap::new).insert(n);
+                Ok(())
+            }
+            None => match self.cache.push(key.into(), DelAddRoaringBitmap::new_del(n)) {
+                Some((key, deladd)) => self.write_entry_to_sorter(key, deladd),
+                None => Ok(()),
+            },
+        }
+    }
+
+    pub fn insert_add_u32(&mut self, key: &[u8], n: u32) -> Result<(), grenad::Error<U>> {
+        match self.cache.get_mut(key) {
+            Some(DelAddRoaringBitmap { del: _, add }) => {
+                add.get_or_insert_with(RoaringBitmap::new).insert(n);
+                Ok(())
+            }
+            None => match self.cache.push(key.into(), DelAddRoaringBitmap::new_add(n)) {
+                Some((key, deladd)) => self.write_entry_to_sorter(key, deladd),
+                None => Ok(()),
+            },
+        }
+    }
+
+    pub fn insert_del_add_u32(&mut self, key: &[u8], n: u32) -> Result<(), grenad::Error<U>> {
+        match self.cache.get_mut(key) {
+            Some(DelAddRoaringBitmap { del, add }) => {
+                del.get_or_insert_with(RoaringBitmap::new).insert(n);
+                add.get_or_insert_with(RoaringBitmap::new).insert(n);
+                Ok(())
+            }
+            None => match self.cache.push(key.into(), DelAddRoaringBitmap::new_del_add(n)) {
+                Some((key, deladd)) => self.write_entry_to_sorter(key, deladd),
+                None => Ok(()),
+            },
+        }
+    }
+
+    fn write_entry_to_sorter(
+        &mut self,
+        key: SmallVec<[u8; N]>,
+        deladd: DelAddRoaringBitmap,
+    ) -> Result<(), grenad::Error<U>> {
+        self.deladd_buffer.clear();
+        let mut value_writer = KvWriterDelAdd::new(&mut self.deladd_buffer);
+        match deladd {
+            DelAddRoaringBitmap { del: Some(del), add: None } => {
+                self.cbo_buffer.clear();
+                CboRoaringBitmapCodec::serialize_into(&del, &mut self.cbo_buffer);
+                value_writer.insert(DelAdd::Deletion, &self.cbo_buffer)?;
+            }
+            DelAddRoaringBitmap { del: None, add: Some(add) } => {
+                self.cbo_buffer.clear();
+                CboRoaringBitmapCodec::serialize_into(&add, &mut self.cbo_buffer);
+                value_writer.insert(DelAdd::Addition, &self.cbo_buffer)?;
+            }
+            DelAddRoaringBitmap { del: Some(del), add: Some(add) } => {
+                self.cbo_buffer.clear();
+                CboRoaringBitmapCodec::serialize_into(&del, &mut self.cbo_buffer);
+                value_writer.insert(DelAdd::Deletion, &self.cbo_buffer)?;
+
+                self.cbo_buffer.clear();
+                CboRoaringBitmapCodec::serialize_into(&add, &mut self.cbo_buffer);
+                value_writer.insert(DelAdd::Addition, &self.cbo_buffer)?;
+            }
+            DelAddRoaringBitmap { del: None, add: None } => return Ok(()),
+        }
+        redis::cmd("INCR").arg(key.as_ref()).query::<usize>(&mut self.conn).unwrap();
+        self.sorter.insert(key, value_writer.into_inner().unwrap())
+    }
+
+    pub fn into_sorter(mut self) -> Result<grenad::Sorter<MF>, grenad::Error<U>> {
+        let default_lru = LruCache::new(NonZeroUsize::MIN);
+        for (key, deladd) in mem::replace(&mut self.cache, default_lru) {
+            self.write_entry_to_sorter(key, deladd)?;
+        }
+        Ok(self.sorter)
+    }
+}
+
+pub struct DelAddRoaringBitmap {
+    pub del: Option<RoaringBitmap>,
+    pub add: Option<RoaringBitmap>,
+}
+
+impl DelAddRoaringBitmap {
+    fn new_del_add(n: u32) -> Self {
+        DelAddRoaringBitmap {
+            del: Some(RoaringBitmap::from([n])),
+            add: Some(RoaringBitmap::from([n])),
+        }
+    }
+
+    fn new_del(n: u32) -> Self {
+        DelAddRoaringBitmap { del: Some(RoaringBitmap::from([n])), add: None }
+    }
+
+    fn new_add(n: u32) -> Self {
+        DelAddRoaringBitmap { del: None, add: Some(RoaringBitmap::from([n])) }
+    }
+}