1 files changed, 15 insertions, 4 deletions

diff --git a/src/remake/mod.rs b/src/remake/mod.rs
index 9206bbf..e9d3021 100644
--- a/src/remake/mod.rs
+++ b/src/remake/mod.rs
@@ -52,9 +52,9 @@ use axum::{
 };
 use tokio::sync::broadcast;
 
-use crate::document::Document;
 use crate::document::replica::Epoch;
 use crate::document::store::ChangeSet;
+use crate::document::{Document, Transaction};
 
 /// Remakes and their aftermath on this node, in numbers (`/admin/stats`).
 #[derive(Debug, Clone, Copy, Default)]
@@ -129,7 +129,11 @@ pub(crate) trait Host: Clone + Send + Sync + 'static {
 
     /// The electorate of a remake proposed now (`vote`): the members that said they are
     /// alive recently enough, read from `doc`.
-    fn electorate(&self, doc: &Document, now: crate::clock::UnixMillis) -> Vec<String>;
+    fn electorate(
+        &self,
+        doc: &impl crate::document::ReadDoc,
+        now: crate::clock::UnixMillis,
+    ) -> Vec<String>;
 
     /// Downloads a change from peers on the local epoch, in chunks from several at once,
     /// checked against its hash.
@@ -183,10 +187,17 @@ pub(crate) trait Host: Clone + Send + Sync + 'static {
     /// One committed change (rolled back on error), published and replicated.
     fn commit_doc<T, E, F>(&self, f: F) -> impl Future<Output = Result<T, E>> + Send
     where
-        F: FnOnce(&mut Document) -> Result<T, E> + Send + 'static,
+        F: FnOnce(&mut Transaction<'_>) -> Result<T, E> + Send + 'static,
         T: Send + 'static,
         E: Send + 'static;
 
+    /// Applies a change downloaded from peers (`fetch_change`), then publishes it like
+    /// a change received by sync.
+    fn apply_change(
+        &self,
+        change: crate::document::Change,
+    ) -> impl Future<Output = Result<(), String>> + Send;
+
     /// Replaces the document and its epoch atomically. Under the write lock, `f` gets
     /// the live document and returns the new one. Afterwards the node resets every
     /// peer's sync state and publishes the change. Returns the old document.
@@ -196,7 +207,7 @@ pub(crate) trait Host: Clone + Send + Sync + 'static {
         f: F,
     ) -> impl Future<Output = Result<Document, E>> + Send
     where
-        F: FnOnce(&mut Document) -> Result<Document, E> + Send + 'static,
+        F: FnOnce(&Document) -> Result<Document, E> + Send + 'static,
         E: Send + 'static;
 }