Query time and database optimization

src/data/repositories.rs

@@ -11,6 +11,8 @@ use rusqlite::Connection;
 use std::marker::PhantomData;
 use std::ops::{Deref, Index, IndexMut};
 use std::sync::Arc;
+use std::time::Instant;
+use log::debug;
 
 pub trait Repository<T, D>
 where
@@ -158,6 +160,7 @@ impl<T: EntityData + Clone + Send + Sync, R: Repository<T, D>, D: DbLayer<T>> Qu
     where
         T: Send + Sync,
     {
+        let time = Instant::now();
         self.cache.clear();
         if self.parallel {
             self.cache = data_repository
@@ -186,6 +189,8 @@ impl<T: EntityData + Clone + Send + Sync, R: Repository<T, D>, D: DbLayer<T>> Qu
                 .map(|(i, entity)| EntityHandle::new(entity.id(), i, false))
                 .collect::<Vec<_>>(),
         );
+
+        debug!("Query for {} elements (filtered {}) takes {:?}", self.len(), self.cache.len(), time.elapsed());
     }
 
     pub fn handles(&self) -> impl Iterator<Item = EntityHandle<T>> {