Add new crate

crates/ra_batch/src/lib.rs

@@ -0,0 +1,30 @@
+use std::sync::Arc;
+
+use ra_db::{
+    FilePosition, FileId, CrateGraph, SourceRoot, SourceRootId, SourceDatabase, salsa,
+};
+use ra_hir::{db, HirInterner};
+
+#[salsa::database(
+    ra_db::SourceDatabaseStorage,
+    db::HirDatabaseStorage,
+    db::PersistentHirDatabaseStorage
+)]
+#[derive(Debug)]
+pub(crate) struct BatchDatabase {
+    runtime: salsa::Runtime<BatchDatabase>,
+    interner: Arc<HirInterner>,
+    file_counter: u32,
+}
+
+impl salsa::Database for BatchDatabase {
+    fn salsa_runtime(&self) -> &salsa::Runtime<BatchDatabase> {
+        &self.runtime
+    }
+}
+
+impl AsRef<HirInterner> for BatchDatabase {
+    fn as_ref(&self) -> &HirInterner {
+        &self.interner
+    }
+}