add a little bit of documentation

index-scheduler/src/lib.rs

@@ -70,6 +70,9 @@ pub struct IndexScheduler {
 }
 
 impl IndexScheduler {
+    /// Return the index corresponding to the name. If it wasn't opened before
+    /// it'll be opened. But if it doesn't exist on disk it'll throw an
+    /// `IndexNotFound` error.
     pub fn index(&self, name: &str) -> Result<Index> {
         let rtxn = self.env.read_txn()?;
         let uuid = self
@@ -105,18 +108,6 @@ impl IndexScheduler {
         Ok(index)
     }
 
-    fn last_task_id(&self, rtxn: &RoTxn) -> Result<Option<TaskId>> {
-        Ok(self
-            .all_tasks
-            .remap_data_type::<DecodeIgnore>()
-            .last(rtxn)?
-            .map(|(k, _)| k.get() + 1))
-    }
-
-    fn next_task_id(&self, rtxn: &RoTxn) -> Result<TaskId> {
-        Ok(self.last_task_id(rtxn)?.unwrap_or_default())
-    }
-
     /// Returns the tasks corresponding to the query.
     pub fn get_tasks(&self, query: Query) -> Result<Vec<Task>> {
         let rtxn = self.env.read_txn()?;
@@ -200,6 +191,7 @@ impl IndexScheduler {
         Ok(())
     }
 
+    /// Notify the scheduler there is or may be work to do.
     pub fn notify(&self) {
         self.wake_up
             .store(true, std::sync::atomic::Ordering::Relaxed);

index-scheduler/src/utils.rs

@@ -1,7 +1,7 @@
 //! Utility functions on the DBs. Mainly getter and setters.
 
 use milli::{
-    heed::{RoTxn, RwTxn},
+    heed::{types::DecodeIgnore, RoTxn, RwTxn},
     BEU32,
 };
 use roaring::RoaringBitmap;
@@ -12,6 +12,18 @@ use crate::{
 };
 
 impl IndexScheduler {
+    pub(crate) fn last_task_id(&self, rtxn: &RoTxn) -> Result<Option<TaskId>> {
+        Ok(self
+            .all_tasks
+            .remap_data_type::<DecodeIgnore>()
+            .last(rtxn)?
+            .map(|(k, _)| k.get() + 1))
+    }
+
+    pub(crate) fn next_task_id(&self, rtxn: &RoTxn) -> Result<TaskId> {
+        Ok(self.last_task_id(rtxn)?.unwrap_or_default())
+    }
+
     pub(crate) fn get_task(&self, rtxn: &RoTxn, task_id: TaskId) -> Result<Option<Task>> {
         Ok(self.all_tasks.get(rtxn, &BEU32::new(task_id))?)
     }