fix compact bugs & update unit tests

backend/src/services/document/persistence.rs

@@ -35,7 +35,7 @@ pub async fn read_document(
     }
 }
 
-#[tracing::instrument(level = "debug", skip(document_manager, params), fields(delta), err)]
+#[tracing::instrument(level = "debug", skip(document_manager, params), err)]
 pub async fn reset_document(
     document_manager: &Arc<ServerDocumentManager>,
     mut params: ResetDocumentParams,

backend/tests/document_test/edit_test.rs

@@ -24,7 +24,7 @@ async fn delta_sync_while_editing() {
         DocScript::ClientInsertText(0, "abc"),
         DocScript::ClientInsertText(3, "123"),
         DocScript::AssertClient(r#"[{"insert":"abc123\n"}]"#),
-        DocScript::AssertServer(r#"[{"insert":"abc123\n"}]"#, 2),
+        DocScript::AssertServer(r#"[{"insert":"abc123\n"}]"#, 1),
     ])
     .await;
 }
@@ -50,11 +50,11 @@ async fn delta_sync_while_editing_with_attribute() {
         DocScript::ClientInsertText(0, "abc"),
         DocScript::ClientFormatText(Interval::new(0, 3), RichTextAttribute::Bold(true)),
         DocScript::AssertClient(r#"[{"insert":"abc","attributes":{"bold":true}},{"insert":"\n"}]"#),
-        DocScript::AssertServer(r#"[{"insert":"abc","attributes":{"bold":true}},{"insert":"\n"}]"#, 2),
+        DocScript::AssertServer(r#"[{"insert":"abc","attributes":{"bold":true}},{"insert":"\n"}]"#, 1),
         DocScript::ClientInsertText(3, "efg"),
         DocScript::ClientFormatText(Interval::new(3, 5), RichTextAttribute::Italic(true)),
         DocScript::AssertClient(r#"[{"insert":"abc","attributes":{"bold":true}},{"insert":"ef","attributes":{"bold":true,"italic":true}},{"insert":"g","attributes":{"bold":true}},{"insert":"\n"}]"#),
-        DocScript::AssertServer(r#"[{"insert":"abc","attributes":{"bold":true}},{"insert":"ef","attributes":{"bold":true,"italic":true}},{"insert":"g","attributes":{"bold":true}},{"insert":"\n"}]"#, 4),
+        DocScript::AssertServer(r#"[{"insert":"abc","attributes":{"bold":true}},{"insert":"ef","attributes":{"bold":true,"italic":true}},{"insert":"g","attributes":{"bold":true}},{"insert":"\n"}]"#, 3),
     ])
     .await;
 }

frontend/app_flowy/packages/flowy_sdk/lib/dispatch/dispatch.dart

@@ -3,7 +3,6 @@ import 'package:dartz/dartz.dart';
 import 'package:flowy_log/flowy_log.dart';
 // ignore: unnecessary_import
 import 'package:flowy_sdk/protobuf/dart-ffi/ffi_response.pb.dart';
-import 'package:flowy_sdk/protobuf/dart-ffi/ffi_request.pb.dart';
 import 'package:flowy_sdk/protobuf/flowy-collaboration/document_info.pb.dart';
 import 'package:flowy_sdk/protobuf/flowy-error/errors.pb.dart';
 import 'package:flowy_sdk/protobuf/flowy-net/event.pb.dart';

frontend/rust-lib/flowy-core/src/services/folder_editor.rs

@@ -12,7 +12,7 @@ use flowy_sync::{
     RevisionWebSocketManager,
 };
 use lib_infra::future::FutureResult;
-use lib_ot::core::PlainTextAttributes;
+use lib_ot::core::PlainAttributes;
 use lib_sqlite::ConnectionPool;
 use parking_lot::RwLock;
 use std::sync::Arc;
@@ -91,6 +91,12 @@ impl FolderEditor {
         })?;
         Ok(())
     }
+
+    #[allow(dead_code)]
+    pub fn folder_json(&self) -> FlowyResult<String> {
+        let json = self.folder.read().to_json()?;
+        Ok(json)
+    }
 }
 
 struct FolderPadBuilder();
@@ -125,22 +131,22 @@ impl FolderEditor {
 
 struct FolderRevisionCompact();
 impl RevisionCompact for FolderRevisionCompact {
-    fn compact_revisions(user_id: &str, object_id: &str, revisions: Vec<Revision>) -> FlowyResult<Revision> {
-        match revisions.last() {
-            None => Err(FlowyError::internal().context("compact revisions is empty")),
-            Some(last_revision) => {
-                let (base_rev_id, rev_id) = last_revision.pair_rev_id();
-                let md5 = last_revision.md5.clone();
-                let delta = make_delta_from_revisions::<PlainTextAttributes>(revisions)?;
-                Ok(Revision::new(
-                    object_id,
-                    base_rev_id,
-                    rev_id,
-                    delta.to_bytes(),
-                    user_id,
-                    md5,
-                ))
-            }
+    fn compact_revisions(user_id: &str, object_id: &str, mut revisions: Vec<Revision>) -> FlowyResult<Revision> {
+        if revisions.is_empty() {
+            return Err(FlowyError::internal().context("Can't compact the empty folder's revisions"));
+        }
+
+        if revisions.len() == 1 {
+            return Ok(revisions.pop().unwrap());
         }
+
+        let first_revision = revisions.first().unwrap();
+        let last_revision = revisions.last().unwrap();
+
+        let (base_rev_id, rev_id) = first_revision.pair_rev_id();
+        let md5 = last_revision.md5.clone();
+        let delta = make_delta_from_revisions::<PlainAttributes>(revisions)?;
+        let delta_data = delta.to_bytes();
+        Ok(Revision::new(object_id, base_rev_id, rev_id, delta_data, user_id, md5))
     }
 }

frontend/rust-lib/flowy-core/src/services/persistence/mod.rs

@@ -122,6 +122,6 @@ impl FolderPersistence {
 
         let conn = pool.get()?;
         let disk_cache = mk_revision_disk_cache(user_id, pool);
-        disk_cache.write_revision_records(vec![record], &conn)
+        disk_cache.create_revision_records(vec![record], &conn)
     }
 }

frontend/rust-lib/flowy-core/src/services/web_socket.rs

@@ -10,7 +10,7 @@ use flowy_collaboration::{
 use flowy_error::FlowyError;
 use flowy_sync::*;
 use lib_infra::future::{BoxResultFuture, FutureResult};
-use lib_ot::core::{Delta, OperationTransformable, PlainDelta, PlainTextAttributes};
+use lib_ot::core::{Delta, OperationTransformable, PlainAttributes, PlainDelta};
 use parking_lot::RwLock;
 use std::{sync::Arc, time::Duration};
 
@@ -23,7 +23,7 @@ pub(crate) async fn make_folder_ws_manager(
 ) -> Arc<RevisionWebSocketManager> {
     let composite_sink_provider = Arc::new(CompositeWSSinkDataProvider::new(folder_id, rev_manager.clone()));
     let resolve_target = Arc::new(FolderRevisionResolveTarget { folder_pad });
-    let resolver = RevisionConflictResolver::<PlainTextAttributes>::new(
+    let resolver = RevisionConflictResolver::<PlainAttributes>::new(
         user_id,
         resolve_target,
         Arc::new(composite_sink_provider.clone()),
@@ -58,8 +58,8 @@ struct FolderRevisionResolveTarget {
     folder_pad: Arc<RwLock<FolderPad>>,
 }
 
-impl ResolverTarget<PlainTextAttributes> for FolderRevisionResolveTarget {
-    fn compose_delta(&self, delta: Delta<PlainTextAttributes>) -> BoxResultFuture<DeltaMD5, FlowyError> {
+impl ResolverTarget<PlainAttributes> for FolderRevisionResolveTarget {
+    fn compose_delta(&self, delta: Delta<PlainAttributes>) -> BoxResultFuture<DeltaMD5, FlowyError> {
         let folder_pad = self.folder_pad.clone();
         Box::pin(async move {
             let md5 = folder_pad.write().compose_remote_delta(delta)?;
@@ -69,8 +69,8 @@ impl ResolverTarget<PlainTextAttributes> for FolderRevisionResolveTarget {
 
     fn transform_delta(
         &self,
-        delta: Delta<PlainTextAttributes>,
-    ) -> BoxResultFuture<TransformDeltas<PlainTextAttributes>, FlowyError> {
+        delta: Delta<PlainAttributes>,
+    ) -> BoxResultFuture<TransformDeltas<PlainAttributes>, FlowyError> {
         let folder_pad = self.folder_pad.clone();
         Box::pin(async move {
             let read_guard = folder_pad.read();
@@ -92,7 +92,7 @@ impl ResolverTarget<PlainTextAttributes> for FolderRevisionResolveTarget {
         })
     }
 
-    fn reset_delta(&self, delta: Delta<PlainTextAttributes>) -> BoxResultFuture<DeltaMD5, FlowyError> {
+    fn reset_delta(&self, delta: Delta<PlainAttributes>) -> BoxResultFuture<DeltaMD5, FlowyError> {
         let folder_pad = self.folder_pad.clone();
         Box::pin(async move {
             let md5 = folder_pad.write().reset_folder(delta)?;
@@ -102,7 +102,7 @@ impl ResolverTarget<PlainTextAttributes> for FolderRevisionResolveTarget {
 }
 
 struct FolderWSStreamConsumerAdapter {
-    resolver: Arc<RevisionConflictResolver<PlainTextAttributes>>,
+    resolver: Arc<RevisionConflictResolver<PlainAttributes>>,
 }
 
 impl RevisionWSSteamConsumer for FolderWSStreamConsumerAdapter {

frontend/rust-lib/flowy-core/tests/workspace/folder_test.rs

@@ -64,8 +64,8 @@ async fn workspace_read() {
 async fn workspace_create_with_apps() {
     let mut test = FolderTest::new().await;
     test.run_scripts(vec![CreateApp {
-        name: "App",
-        desc: "App description",
+        name: "App".to_string(),
+        desc: "App description".to_string(),
     }])
     .await;
 
@@ -147,12 +147,12 @@ async fn app_create_with_view() {
     let mut app = test.app.clone();
     test.run_scripts(vec![
         CreateView {
-            name: "View A",
-            desc: "View A description",
+            name: "View A".to_owned(),
+            desc: "View A description".to_owned(),
         },
         CreateView {
-            name: "View B",
-            desc: "View B description",
+            name: "View B".to_owned(),
+            desc: "View B description".to_owned(),
         },
         ReadApp(app.id),
     ])
@@ -219,12 +219,12 @@ async fn view_delete_all() {
     let app = test.app.clone();
     test.run_scripts(vec![
         CreateView {
-            name: "View A",
-            desc: "View A description",
+            name: "View A".to_owned(),
+            desc: "View A description".to_owned(),
         },
         CreateView {
-            name: "View B",
-            desc: "View B description",
+            name: "View B".to_owned(),
+            desc: "View B description".to_owned(),
         },
         ReadApp(app.id.clone()),
     ])
@@ -250,8 +250,8 @@ async fn view_delete_all_permanent() {
     let app = test.app.clone();
     test.run_scripts(vec![
         CreateView {
-            name: "View A",
-            desc: "View A description",
+            name: "View A".to_owned(),
+            desc: "View A description".to_owned(),
         },
         ReadApp(app.id.clone()),
     ])
@@ -299,13 +299,8 @@ async fn folder_sync_revision_seq() {
             rev_id: 2,
             state: RevisionState::Sync,
         },
-        AssertRevisionState {
-            rev_id: 3,
-            state: RevisionState::Sync,
-        },
         AssertNextSyncRevId(Some(1)),
         AssertNextSyncRevId(Some(2)),
-        AssertNextSyncRevId(Some(3)),
         AssertRevisionState {
             rev_id: 1,
             state: RevisionState::Ack,
@@ -314,10 +309,6 @@ async fn folder_sync_revision_seq() {
             rev_id: 2,
             state: RevisionState::Ack,
         },
-        AssertRevisionState {
-            rev_id: 3,
-            state: RevisionState::Ack,
-        },
     ])
     .await;
 }
@@ -325,35 +316,50 @@ async fn folder_sync_revision_seq() {
 #[tokio::test]
 async fn folder_sync_revision_with_new_app() {
     let mut test = FolderTest::new().await;
+    let app_name = "AppFlowy contributors".to_owned();
+    let app_desc = "Welcome to be a AppFlowy contributor".to_owned();
+
     test.run_scripts(vec![
         AssertNextSyncRevId(Some(1)),
         AssertNextSyncRevId(Some(2)),
-        AssertNextSyncRevId(Some(3)),
         CreateApp {
-            name: "New App",
-            desc: "",
+            name: app_name.clone(),
+            desc: app_desc.clone(),
         },
-        AssertCurrentRevId(4),
-        AssertNextSyncRevId(Some(4)),
+        AssertCurrentRevId(3),
+        AssertNextSyncRevId(Some(3)),
         AssertNextSyncRevId(None),
     ])
     .await;
+
+    let app = test.app.clone();
+    assert_eq!(app.name, app_name);
+    assert_eq!(app.desc, app_desc);
+    test.run_scripts(vec![ReadApp(app.id.clone()), AssertApp(app)]).await;
 }
 
 #[tokio::test]
 async fn folder_sync_revision_with_new_view() {
     let mut test = FolderTest::new().await;
+    let view_name = "AppFlowy features".to_owned();
+    let view_desc = "😁".to_owned();
+
     test.run_scripts(vec![
         AssertNextSyncRevId(Some(1)),
         AssertNextSyncRevId(Some(2)),
-        AssertNextSyncRevId(Some(3)),
         CreateView {
-            name: "New App",
-            desc: "",
+            name: view_name.clone(),
+            desc: view_desc.clone(),
         },
-        AssertCurrentRevId(4),
-        AssertNextSyncRevId(Some(4)),
+        AssertCurrentRevId(3),
+        AssertNextSyncRevId(Some(3)),
         AssertNextSyncRevId(None),
     ])
     .await;
+
+    let view = test.view.clone();
+    assert_eq!(view.name, view_name);
+    assert_eq!(view.desc, view_desc);
+    test.run_scripts(vec![ReadView(view.id.clone()), AssertView(view)])
+        .await;
 }

frontend/rust-lib/flowy-core/tests/workspace/script.rs

@@ -21,7 +21,7 @@ pub enum FolderScript {
     ReadWorkspace(Option<String>),
 
     // App
-    CreateApp { name: &'static str, desc: &'static str },
+    CreateApp { name: String, desc: String },
     AssertAppJson(String),
     AssertApp(App),
     ReadApp(String),
@@ -29,7 +29,7 @@ pub enum FolderScript {
     DeleteApp,
 
     // View
-    CreateView { name: &'static str, desc: &'static str },
+    CreateView { name: String, desc: String },
     AssertView(View),
     ReadView(String),
     UpdateView { name: Option<String>, desc: Option<String> },
@@ -124,7 +124,7 @@ impl FolderTest {
                 self.workspace = workspace;
             }
             FolderScript::CreateApp { name, desc } => {
-                let app = create_app(sdk, &self.workspace.id, name, desc).await;
+                let app = create_app(sdk, &self.workspace.id, &name, &desc).await;
                 self.app = app;
             }
             FolderScript::AssertAppJson(expected_json) => {
@@ -146,7 +146,7 @@ impl FolderTest {
             }
 
             FolderScript::CreateView { name, desc } => {
-                let view = create_view(sdk, &self.app.id, name, desc, ViewType::Doc).await;
+                let view = create_view(sdk, &self.app.id, &name, &desc, ViewType::Doc).await;
                 self.view = view;
             }
             FolderScript::AssertView(view) => {
@@ -193,7 +193,7 @@ impl FolderTest {
                 }
             }
             FolderScript::AssertCurrentRevId(rev_id) => {
-                assert_eq!(rev_manager.rev_id(), rev_id);
+                assert_eq!(rev_manager.rev_id(), rev_id, "Current rev_id is not match");
             }
             FolderScript::AssertNextSyncRevId(rev_id) => {
                 let next_revision = rev_manager.next_sync_revision().await.unwrap();
@@ -201,7 +201,8 @@ impl FolderTest {
                     assert!(next_revision.is_none(), "Next revision should be None");
                     return;
                 }
-                let next_revision = next_revision.unwrap();
+                let next_revision = next_revision
+                    .unwrap_or_else(|| panic!("Expected Next revision is {}, but receive None", rev_id.unwrap()));
                 let mut receiver = rev_manager.revision_ack_receiver();
                 let _ = receiver.recv().await;
                 assert_eq!(next_revision.rev_id, rev_id.unwrap());

frontend/rust-lib/flowy-document/src/core/queue.rs

@@ -194,23 +194,23 @@ impl EditorCommandQueue {
 
 pub(crate) struct DocumentRevisionCompact();
 impl RevisionCompact for DocumentRevisionCompact {
-    fn compact_revisions(user_id: &str, object_id: &str, revisions: Vec<Revision>) -> FlowyResult<Revision> {
-        match revisions.last() {
-            None => Err(FlowyError::internal().context("compact revisions is empty")),
-            Some(last_revision) => {
-                let (base_rev_id, rev_id) = last_revision.pair_rev_id();
-                let md5 = last_revision.md5.clone();
-                let delta = make_delta_from_revisions::<RichTextAttributes>(revisions)?;
-                Ok(Revision::new(
-                    object_id,
-                    base_rev_id,
-                    rev_id,
-                    delta.to_bytes(),
-                    user_id,
-                    md5,
-                ))
-            }
+    fn compact_revisions(user_id: &str, object_id: &str, mut revisions: Vec<Revision>) -> FlowyResult<Revision> {
+        if revisions.is_empty() {
+            return Err(FlowyError::internal().context("Can't compact the empty document's revisions"));
+        }
+
+        if revisions.len() == 1 {
+            return Ok(revisions.pop().unwrap());
         }
+
+        let first_revision = revisions.first().unwrap();
+        let last_revision = revisions.last().unwrap();
+
+        let (base_rev_id, rev_id) = first_revision.pair_rev_id();
+        let md5 = last_revision.md5.clone();
+        let delta = make_delta_from_revisions::<RichTextAttributes>(revisions)?;
+        let delta_data = delta.to_bytes();
+        Ok(Revision::new(object_id, base_rev_id, rev_id, delta_data, user_id, md5))
     }
 }
 

frontend/rust-lib/flowy-document/tests/document/document_test.rs

@@ -11,7 +11,7 @@ async fn document_sync_current_rev_id_check() {
         AssertCurrentRevId(2),
         InsertText("3", 2),
         AssertCurrentRevId(3),
-        AssertNextRevId(None),
+        AssertNextSyncRevId(None),
         AssertJson(r#"[{"insert":"123\n"}]"#),
     ];
     EditorTest::new().await.run_scripts(scripts).await;
@@ -38,7 +38,7 @@ async fn document_sync_insert_test() {
         InsertText("2", 1),
         InsertText("3", 2),
         AssertJson(r#"[{"insert":"123\n"}]"#),
-        AssertNextRevId(None),
+        AssertNextSyncRevId(None),
     ];
     EditorTest::new().await.run_scripts(scripts).await;
 }

frontend/rust-lib/flowy-document/tests/document/edit_script.rs

@@ -11,7 +11,7 @@ pub enum EditorScript {
     Replace(Interval, &'static str),
 
     AssertRevisionState(i64, RevisionState),
-    AssertNextRevId(Option<i64>),
+    AssertNextSyncRevId(Option<i64>),
     AssertCurrentRevId(i64),
     AssertJson(&'static str),
 }
@@ -60,13 +60,15 @@ impl EditorTest {
             EditorScript::AssertCurrentRevId(rev_id) => {
                 assert_eq!(self.editor.rev_manager().rev_id(), rev_id);
             }
-            EditorScript::AssertNextRevId(rev_id) => {
+            EditorScript::AssertNextSyncRevId(rev_id) => {
                 let next_revision = rev_manager.next_sync_revision().await.unwrap();
                 if rev_id.is_none() {
                     assert!(next_revision.is_none(), "Next revision should be None");
                     return;
                 }
                 let next_revision = next_revision.unwrap();
+                let mut receiver = rev_manager.revision_ack_receiver();
+                let _ = receiver.recv().await;
                 assert_eq!(next_revision.rev_id, rev_id.unwrap());
             }
             EditorScript::AssertJson(expected) => {

frontend/rust-lib/flowy-sync/src/cache/disk/mod.rs

@@ -9,7 +9,7 @@ use std::fmt::Debug;
 
 pub trait RevisionDiskCache: Sync + Send {
     type Error: Debug;
-    fn write_revision_records(
+    fn create_revision_records(
         &self,
         revision_records: Vec<RevisionRecord>,
         conn: &SqliteConnection,
@@ -39,5 +39,12 @@ pub trait RevisionDiskCache: Sync + Send {
         conn: &SqliteConnection,
     ) -> Result<(), Self::Error>;
 
-    fn reset_object(&self, object_id: &str, revision_records: Vec<RevisionRecord>) -> Result<(), Self::Error>;
+    // Delete and insert will be executed in the same transaction.
+    // It deletes all the records if the deleted_rev_ids is None and then insert the new records
+    fn delete_and_insert_records(
+        &self,
+        object_id: &str,
+        deleted_rev_ids: Option<Vec<i64>>,
+        inserted_records: Vec<RevisionRecord>,
+    ) -> Result<(), Self::Error>;
 }

frontend/rust-lib/flowy-sync/src/cache/disk/sql_impl.rs

@@ -22,7 +22,7 @@ pub struct SQLitePersistence {
 impl RevisionDiskCache for SQLitePersistence {
     type Error = FlowyError;
 
-    fn write_revision_records(
+    fn create_revision_records(
         &self,
         revision_records: Vec<RevisionRecord>,
         conn: &SqliteConnection,
@@ -72,11 +72,16 @@ impl RevisionDiskCache for SQLitePersistence {
         Ok(())
     }
 
-    fn reset_object(&self, object_id: &str, revision_records: Vec<RevisionRecord>) -> Result<(), Self::Error> {
+    fn delete_and_insert_records(
+        &self,
+        object_id: &str,
+        deleted_rev_ids: Option<Vec<i64>>,
+        inserted_records: Vec<RevisionRecord>,
+    ) -> Result<(), Self::Error> {
         let conn = self.pool.get().map_err(internal_error)?;
         conn.immediate_transaction::<_, FlowyError, _>(|| {
-            let _ = self.delete_revision_records(object_id, None, &*conn)?;
-            let _ = self.write_revision_records(revision_records, &*conn)?;
+            let _ = self.delete_revision_records(object_id, deleted_rev_ids, &*conn)?;
+            let _ = self.create_revision_records(inserted_records, &*conn)?;
             Ok(())
         })
     }
@@ -96,6 +101,7 @@ pub struct RevisionTableSql {}
 impl RevisionTableSql {
     pub(crate) fn create(revision_records: Vec<RevisionRecord>, conn: &SqliteConnection) -> Result<(), FlowyError> {
         // Batch insert: https://diesel.rs/guides/all-about-inserts.html
+
         let records = revision_records
             .into_iter()
             .map(|record| {
@@ -172,7 +178,8 @@ impl RevisionTableSql {
         rev_ids: Option<Vec<i64>>,
         conn: &SqliteConnection,
     ) -> Result<(), FlowyError> {
-        let mut sql = dsl::rev_table.filter(dsl::doc_id.eq(object_id)).into_boxed();
+        let filter = dsl::rev_table.filter(dsl::doc_id.eq(object_id));
+        let mut sql = diesel::delete(filter).into_boxed();
         if let Some(rev_ids) = rev_ids {
             sql = sql.filter(dsl::rev_id.eq_any(rev_ids));
         }

frontend/rust-lib/flowy-sync/src/cache/memory.rs

@@ -40,19 +40,12 @@ impl RevisionMemoryCache {
         };
 
         let rev_id = record.revision.rev_id;
-        if self.revs_map.contains_key(&rev_id) {
-            return;
-        }
+        self.revs_map.insert(rev_id, record);
 
-        if let Some(rev_id) = self.pending_write_revs.read().await.last() {
-            if *rev_id >= record.revision.rev_id {
-                tracing::error!("Duplicated revision added to memory_cache");
-                return;
-            }
+        if !self.pending_write_revs.read().await.contains(&rev_id) {
+            self.pending_write_revs.write().await.push(rev_id);
+            self.make_checkpoint().await;
         }
-        self.revs_map.insert(rev_id, record);
-        self.pending_write_revs.write().await.push(rev_id);
-        self.make_checkpoint().await;
     }
 
     pub(crate) async fn ack(&self, rev_id: &i64) {
@@ -61,12 +54,12 @@ impl RevisionMemoryCache {
             Some(mut record) => record.ack(),
         }
 
-        if !self.pending_write_revs.read().await.contains(rev_id) {
+        if self.pending_write_revs.read().await.contains(rev_id) {
+            self.make_checkpoint().await;
+        } else {
             // The revision must be saved on disk if the pending_write_revs
             // doesn't contains the rev_id.
             self.delegate.receive_ack(&self.object_id, *rev_id);
-        } else {
-            self.make_checkpoint().await;
         }
     }
 
@@ -74,6 +67,16 @@ impl RevisionMemoryCache {
         self.revs_map.get(rev_id).map(|r| r.value().clone())
     }
 
+    pub(crate) fn remove(&self, rev_id: &i64) {
+        let _ = self.revs_map.remove(rev_id);
+    }
+
+    pub(crate) fn remove_with_range(&self, range: &RevisionRange) {
+        for rev_id in range.iter() {
+            self.remove(&rev_id);
+        }
+    }
+
     pub(crate) async fn get_with_range(&self, range: &RevisionRange) -> Result<Vec<RevisionRecord>, FlowyError> {
         let revs = range
             .iter()
@@ -82,7 +85,7 @@ impl RevisionMemoryCache {
         Ok(revs)
     }
 
-    pub(crate) async fn reset_with_revisions(&self, revision_records: &[RevisionRecord]) -> FlowyResult<()> {
+    pub(crate) async fn reset_with_revisions(&self, revision_records: Vec<RevisionRecord>) {
         self.revs_map.clear();
         if let Some(handler) = self.defer_save.write().await.take() {
             handler.abort();
@@ -91,13 +94,12 @@ impl RevisionMemoryCache {
         let mut write_guard = self.pending_write_revs.write().await;
         write_guard.clear();
         for record in revision_records {
-            self.revs_map.insert(record.revision.rev_id, record.clone());
             write_guard.push(record.revision.rev_id);
+            self.revs_map.insert(record.revision.rev_id, record);
         }
         drop(write_guard);
 
         self.make_checkpoint().await;
-        Ok(())
     }
 
     async fn make_checkpoint(&self) {

frontend/rust-lib/flowy-sync/src/cache/mod.rs

@@ -5,10 +5,11 @@ use crate::cache::{
     disk::{RevisionChangeset, RevisionDiskCache, RevisionTableState, SQLitePersistence},
     memory::{RevisionMemoryCache, RevisionMemoryCacheDelegate},
 };
-use crate::RevisionCompact;
+
 use flowy_collaboration::entities::revision::{Revision, RevisionRange, RevisionState};
 use flowy_database::ConnectionPool;
 use flowy_error::{internal_error, FlowyError, FlowyResult};
+
 use std::{
     borrow::Cow,
     sync::{
@@ -26,14 +27,6 @@ pub struct RevisionCache {
     memory_cache: Arc<RevisionMemoryCache>,
     latest_rev_id: AtomicI64,
 }
-
-pub fn mk_revision_disk_cache(
-    user_id: &str,
-    pool: Arc<ConnectionPool>,
-) -> Arc<dyn RevisionDiskCache<Error = FlowyError>> {
-    Arc::new(SQLitePersistence::new(user_id, pool))
-}
-
 impl RevisionCache {
     pub fn new(user_id: &str, object_id: &str, pool: Arc<ConnectionPool>) -> RevisionCache {
         let disk_cache = Arc::new(SQLitePersistence::new(user_id, pool));
@@ -51,7 +44,6 @@ impl RevisionCache {
         if self.memory_cache.contains(&revision.rev_id) {
             return Err(FlowyError::internal().context(format!("Duplicate revision: {} {:?}", revision.rev_id, state)));
         }
-        let state = state.as_ref().clone();
         let rev_id = revision.rev_id;
         let record = RevisionRecord {
             revision,
@@ -64,6 +56,24 @@ impl RevisionCache {
         Ok(())
     }
 
+    pub async fn compact(&self, range: &RevisionRange, new_revision: Revision) -> FlowyResult<()> {
+        self.memory_cache.remove_with_range(range);
+        let rev_id = new_revision.rev_id;
+        let record = RevisionRecord {
+            revision: new_revision,
+            state: RevisionState::Sync,
+            write_to_disk: true,
+        };
+
+        let rev_ids = range.to_rev_ids();
+        let _ = self
+            .disk_cache
+            .delete_and_insert_records(&self.object_id, Some(rev_ids), vec![record.clone()])?;
+        self.memory_cache.add(Cow::Owned(record)).await;
+        self.set_latest_rev_id(rev_id);
+        Ok(())
+    }
+
     pub async fn ack(&self, rev_id: i64) {
         self.memory_cache.ack(&rev_id).await;
     }
@@ -93,7 +103,8 @@ impl RevisionCache {
     }
 
     // Read the revision which rev_id >= range.start && rev_id <= range.end
-    pub async fn revisions_in_range(&self, range: RevisionRange) -> FlowyResult<Vec<Revision>> {
+    pub async fn revisions_in_range(&self, range: &RevisionRange) -> FlowyResult<Vec<Revision>> {
+        let range = range.clone();
         let mut records = self.memory_cache.get_with_range(&range).await?;
         let range_len = range.len() as usize;
         if records.len() != range_len {
@@ -104,6 +115,11 @@ impl RevisionCache {
                 .map_err(internal_error)??;
 
             if records.len() != range_len {
+                // #[cfg(debug_assertions)]
+                // records.iter().for_each(|record| {
+                //     let delta = PlainDelta::from_bytes(&record.revision.delta_data).unwrap();
+                //     tracing::trace!("{}", delta.to_string());
+                // });
                 tracing::error!("Revisions len is not equal to range required");
             }
         }
@@ -113,9 +129,9 @@ impl RevisionCache {
             .collect::<Vec<Revision>>())
     }
 
-    #[tracing::instrument(level = "debug", skip(self, revisions))]
+    #[tracing::instrument(level = "debug", skip(self, revisions), err)]
     pub async fn reset_with_revisions(&self, object_id: &str, revisions: Vec<Revision>) -> FlowyResult<()> {
-        let revision_records = revisions
+        let records = revisions
             .to_vec()
             .into_iter()
             .map(|revision| RevisionRecord {
@@ -125,8 +141,11 @@ impl RevisionCache {
             })
             .collect::<Vec<_>>();
 
-        let _ = self.memory_cache.reset_with_revisions(&revision_records).await?;
-        let _ = self.disk_cache.reset_object(object_id, revision_records)?;
+        let _ = self
+            .disk_cache
+            .delete_and_insert_records(object_id, None, records.clone())?;
+        let _ = self.memory_cache.reset_with_revisions(records).await;
+
         Ok(())
     }
 
@@ -136,6 +155,13 @@ impl RevisionCache {
     }
 }
 
+pub fn mk_revision_disk_cache(
+    user_id: &str,
+    pool: Arc<ConnectionPool>,
+) -> Arc<dyn RevisionDiskCache<Error = FlowyError>> {
+    Arc::new(SQLitePersistence::new(user_id, pool))
+}
+
 impl RevisionMemoryCacheDelegate for Arc<SQLitePersistence> {
     #[tracing::instrument(level = "trace", skip(self, records), fields(checkpoint_result), err)]
     fn checkpoint_tick(&self, mut records: Vec<RevisionRecord>) -> FlowyResult<()> {
@@ -146,7 +172,7 @@ impl RevisionMemoryCacheDelegate for Arc<SQLitePersistence> {
                 "checkpoint_result",
                 &format!("{} records were saved", records.len()).as_str(),
             );
-            let _ = self.write_revision_records(records, conn)?;
+            let _ = self.create_revision_records(records, conn)?;
         }
         Ok(())
     }
@@ -164,7 +190,7 @@ impl RevisionMemoryCacheDelegate for Arc<SQLitePersistence> {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct RevisionRecord {
     pub revision: Revision,
     pub state: RevisionState,

frontend/rust-lib/flowy-sync/src/rev_manager.rs

@@ -1,12 +1,11 @@
 use crate::RevisionCache;
-
 use flowy_collaboration::{
     entities::revision::{RepeatedRevision, Revision, RevisionRange, RevisionState},
     util::{pair_rev_id_from_revisions, RevIdCounter},
 };
 use flowy_error::{FlowyError, FlowyResult};
 use lib_infra::future::FutureResult;
-use lib_ot::core::Attributes;
+
 use std::{collections::VecDeque, sync::Arc};
 use tokio::sync::RwLock;
 
@@ -36,7 +35,11 @@ pub struct RevisionManager {
 impl RevisionManager {
     pub fn new(user_id: &str, object_id: &str, revision_cache: Arc<RevisionCache>) -> Self {
         let rev_id_counter = RevIdCounter::new(0);
-        let cache = Arc::new(RwLock::new(RevisionCacheCompact::new(object_id, revision_cache)));
+        let cache = Arc::new(RwLock::new(RevisionCacheCompact::new(
+            object_id,
+            user_id,
+            revision_cache,
+        )));
         #[cfg(feature = "flowy_unit_test")]
         let (revision_ack_notifier, _) = tokio::sync::broadcast::channel(1);
 
@@ -71,7 +74,9 @@ impl RevisionManager {
     #[tracing::instrument(level = "debug", skip(self, revisions), err)]
     pub async fn reset_object(&self, revisions: RepeatedRevision) -> FlowyResult<()> {
         let rev_id = pair_rev_id_from_revisions(&revisions).1;
-        let _ = self.cache.write().await.reset(revisions.into_inner()).await?;
+
+        let write_guard = self.cache.write().await;
+        let _ = write_guard.reset(revisions.into_inner()).await?;
         self.rev_id_counter.set(rev_id);
         Ok(())
     }
@@ -81,7 +86,9 @@ impl RevisionManager {
         if revision.delta_data.is_empty() {
             return Err(FlowyError::internal().context("Delta data should be empty"));
         }
-        self.cache.read().await.add_ack_revision(revision).await?;
+
+        let write_guard = self.cache.write().await;
+        let _ = write_guard.add_ack_revision(revision).await?;
         self.rev_id_counter.set(revision.rev_id);
         Ok(())
     }
@@ -94,7 +101,10 @@ impl RevisionManager {
         if revision.delta_data.is_empty() {
             return Err(FlowyError::internal().context("Delta data should be empty"));
         }
-        self.cache.write().await.add_sync_revision::<C>(revision, true).await?;
+        let mut write_guard = self.cache.write().await;
+        let rev_id = write_guard.write_sync_revision::<C>(revision).await?;
+
+        self.rev_id_counter.set(rev_id);
         Ok(())
     }
 
@@ -118,7 +128,7 @@ impl RevisionManager {
     }
 
     pub async fn get_revisions_in_range(&self, range: RevisionRange) -> Result<Vec<Revision>, FlowyError> {
-        let revisions = self.cache.read().await.revisions_in_range(range.clone()).await?;
+        let revisions = self.cache.read().await.revisions_in_range(&range).await?;
         Ok(revisions)
     }
 
@@ -143,16 +153,19 @@ impl RevisionManager {
 
 struct RevisionCacheCompact {
     object_id: String,
+    user_id: String,
     inner: Arc<RevisionCache>,
     sync_seq: RevisionSyncSequence,
 }
 
 impl RevisionCacheCompact {
-    fn new(object_id: &str, inner: Arc<RevisionCache>) -> Self {
+    fn new(object_id: &str, user_id: &str, inner: Arc<RevisionCache>) -> Self {
         let sync_seq = RevisionSyncSequence::new();
         let object_id = object_id.to_owned();
+        let user_id = user_id.to_owned();
         Self {
             object_id,
+            user_id,
             inner,
             sync_seq,
         }
@@ -162,23 +175,49 @@ impl RevisionCacheCompact {
         self.inner.add(revision.clone(), RevisionState::Ack, true).await
     }
 
-    async fn add_sync_revision<C>(&mut self, revision: &Revision, write_to_disk: bool) -> FlowyResult<()>
+    async fn add_sync_revision(&mut self, revision: &Revision) -> FlowyResult<()> {
+        self.inner.add(revision.clone(), RevisionState::Sync, false).await?;
+        self.sync_seq.add(revision.rev_id)?;
+        Ok(())
+    }
+
+    #[tracing::instrument(level = "trace", skip(self, revision), fields(rev_id, compact_range), err)]
+    async fn write_sync_revision<C>(&mut self, revision: &Revision) -> FlowyResult<i64>
     where
         C: RevisionCompact,
     {
-        // match self.sync_seq.remaining_rev_ids() {
-        //     None => {}
-        //     Some(range) => {
-        //         let revisions = self.inner.revisions_in_range(range).await?;
-        //         let compact_revision = C::compact_revisions("", "", revisions)?;
-        //     }
-        // }
-
-        self.inner
-            .add(revision.clone(), RevisionState::Sync, write_to_disk)
-            .await?;
-        self.sync_seq.add_record(revision.rev_id)?;
-        Ok(())
+        match self.sync_seq.compact() {
+            None => {
+                tracing::Span::current().record("rev_id", &revision.rev_id);
+                self.inner.add(revision.clone(), RevisionState::Sync, true).await?;
+                self.sync_seq.add(revision.rev_id)?;
+                Ok(revision.rev_id)
+            }
+            Some((range, mut compact_seq)) => {
+                tracing::Span::current().record("compact_range", &format!("{}", range).as_str());
+                let mut revisions = self.inner.revisions_in_range(&range).await?;
+                if range.to_rev_ids().len() != revisions.len() {
+                    debug_assert_eq!(range.to_rev_ids().len(), revisions.len());
+                }
+
+                // append the new revision
+                revisions.push(revision.clone());
+
+                // compact multiple revisions into one
+                let compact_revision = C::compact_revisions(&self.user_id, &self.object_id, revisions)?;
+                let rev_id = compact_revision.rev_id;
+                tracing::Span::current().record("rev_id", &rev_id);
+
+                // insert new revision
+                compact_seq.push_back(rev_id);
+
+                // replace the revisions in range with compact revision
+                self.inner.compact(&range, compact_revision).await?;
+                debug_assert_eq!(self.sync_seq.len(), compact_seq.len());
+                self.sync_seq.reset(compact_seq);
+                Ok(rev_id)
+            }
+        }
     }
 
     async fn ack_revision(&mut self, rev_id: i64) -> FlowyResult<()> {
@@ -189,9 +228,13 @@ impl RevisionCacheCompact {
     }
 
     async fn next_sync_revision(&self) -> FlowyResult<Option<Revision>> {
-        match self.sync_seq.next_rev_id() {
-            None => Ok(None),
-            Some(rev_id) => Ok(self.inner.get(rev_id).await.map(|record| record.revision)),
+        if cfg!(feature = "flowy_unit_test") {
+            match self.sync_seq.next_rev_id() {
+                None => Ok(None),
+                Some(rev_id) => Ok(self.inner.get(rev_id).await.map(|record| record.revision)),
+            }
+        } else {
+            Ok(None)
         }
     }
 
@@ -216,7 +259,7 @@ impl RevisionSyncSequence {
         RevisionSyncSequence::default()
     }
 
-    fn add_record(&mut self, new_rev_id: i64) -> FlowyResult<()> {
+    fn add(&mut self, new_rev_id: i64) -> FlowyResult<()> {
         // The last revision's rev_id must be greater than the new one.
         if let Some(rev_id) = self.0.back() {
             if *rev_id >= new_rev_id {
@@ -248,16 +291,24 @@ impl RevisionSyncSequence {
         self.0.front().cloned()
     }
 
-    fn remaining_rev_ids(&self) -> Option<RevisionRange> {
-        if self.next_rev_id().is_some() {
-            let mut seq = self.0.clone();
-            let mut drained = seq.drain(1..).collect::<VecDeque<_>>();
-            let start = drained.pop_front()?;
-            let end = drained.pop_back().unwrap_or_else(|| start);
-            Some(RevisionRange { start, end })
-        } else {
-            None
-        }
+    fn reset(&mut self, new_seq: VecDeque<i64>) {
+        self.0 = new_seq;
+    }
+
+    fn len(&self) -> usize {
+        self.0.len()
+    }
+
+    // Compact the rev_ids into one except the current synchronizing rev_id.
+    fn compact(&self) -> Option<(RevisionRange, VecDeque<i64>)> {
+        self.next_rev_id()?;
+
+        let mut new_seq = self.0.clone();
+        let mut drained = new_seq.drain(1..).collect::<VecDeque<_>>();
+
+        let start = drained.pop_front()?;
+        let end = drained.pop_back().unwrap_or(start);
+        Some((RevisionRange { start, end }, new_seq))
     }
 }
 
@@ -288,12 +339,7 @@ impl RevisionLoader {
                 rev_id = record.revision.rev_id;
                 if record.state == RevisionState::Sync {
                     // Sync the records if their state is RevisionState::Sync.
-                    let _ = self
-                        .cache
-                        .write()
-                        .await
-                        .add_sync_revision::<C>(&record.revision, false)
-                        .await?;
+                    let _ = self.cache.write().await.add_sync_revision(&record.revision).await?;
                 }
             }
             revisions = records.into_iter().map(|record| record.revision).collect::<_>();

frontend/rust-lib/flowy-sync/src/ws_manager.rs

@@ -287,23 +287,26 @@ impl RevisionWSSink {
     }
 
     async fn send_next_revision(&self) -> FlowyResult<()> {
-        if cfg!(feature = "flowy_unit_test") {
-            match self.provider.next().await? {
-                None => {
-                    tracing::trace!("[{}]: Finish synchronizing revisions", self);
-                    Ok(())
-                }
-                Some(data) => {
-                    tracing::trace!("[{}]: send {}:{}-{:?}", self, data.object_id, data.id(), data.ty);
-                    self.ws_sender.send(data).await
-                }
+        match self.provider.next().await? {
+            None => {
+                tracing::trace!("[{}]: Finish synchronizing revisions", self);
+                Ok(())
+            }
+            Some(data) => {
+                tracing::trace!("[{}]: send {}:{}-{:?}", self, data.object_id, data.id(), data.ty);
+                self.ws_sender.send(data).await
             }
-        } else {
-            Ok(())
         }
     }
 }
 
+async fn tick(sender: mpsc::Sender<()>, duration: Duration) {
+    let mut interval = interval(duration);
+    while sender.send(()).await.is_ok() {
+        interval.tick().await;
+    }
+}
+
 impl std::fmt::Display for RevisionWSSink {
     fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
         f.write_fmt(format_args!("{}RevisionWSSink", self.object_name))
@@ -316,13 +319,6 @@ impl std::ops::Drop for RevisionWSSink {
     }
 }
 
-async fn tick(sender: mpsc::Sender<()>, duration: Duration) {
-    let mut interval = interval(duration);
-    while sender.send(()).await.is_ok() {
-        interval.tick().await;
-    }
-}
-
 #[derive(Clone)]
 enum Source {
     Custom,

shared-lib/flowy-collaboration/src/client_folder/builder.rs

@@ -6,7 +6,7 @@ use crate::{
     errors::{CollaborateError, CollaborateResult},
 };
 use flowy_core_data_model::entities::{trash::Trash, workspace::Workspace};
-use lib_ot::core::{OperationTransformable, PlainDelta, PlainDeltaBuilder, PlainTextAttributes};
+use lib_ot::core::{PlainAttributes, PlainDelta, PlainDeltaBuilder};
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
 
@@ -47,7 +47,7 @@ impl FolderPadBuilder {
     }
 
     pub(crate) fn build_with_revisions(self, revisions: Vec<Revision>) -> CollaborateResult<FolderPad> {
-        let folder_delta: FolderDelta = make_delta_from_revisions::<PlainTextAttributes>(revisions)?;
+        let folder_delta: FolderDelta = make_delta_from_revisions::<PlainAttributes>(revisions)?;
         self.build_with_delta(folder_delta)
     }
 

shared-lib/flowy-collaboration/src/client_folder/folder_pad.rs

@@ -8,7 +8,7 @@ use crate::{
 };
 use dissimilar::*;
 use flowy_core_data_model::entities::{app::App, trash::Trash, view::View, workspace::Workspace};
-use lib_ot::core::{Delta, FlowyStr, OperationTransformable, PlainDeltaBuilder, PlainTextAttributes};
+use lib_ot::core::{Delta, FlowyStr, OperationTransformable, PlainAttributes, PlainDeltaBuilder};
 use serde::{Deserialize, Serialize};
 use std::sync::Arc;
 
@@ -285,6 +285,11 @@ impl FolderPad {
     pub fn md5(&self) -> String {
         md5(&self.root.to_bytes())
     }
+
+    pub fn to_json(&self) -> CollaborateResult<String> {
+        serde_json::to_string(self)
+            .map_err(|e| CollaborateError::internal().context(format!("serial trash to json failed: {}", e)))
+    }
 }
 
 impl FolderPad {
@@ -372,14 +377,9 @@ impl FolderPad {
             }
         })
     }
-
-    fn to_json(&self) -> CollaborateResult<String> {
-        serde_json::to_string(self)
-            .map_err(|e| CollaborateError::internal().context(format!("serial trash to json failed: {}", e)))
-    }
 }
 
-fn cal_diff(old: String, new: String) -> Delta<PlainTextAttributes> {
+fn cal_diff(old: String, new: String) -> Delta<PlainAttributes> {
     let chunks = dissimilar::diff(&old, &new);
     let mut delta_builder = PlainDeltaBuilder::new();
     for chunk in &chunks {

shared-lib/flowy-collaboration/src/entities/revision.rs

@@ -200,9 +200,13 @@ impl RevisionRange {
     }
 
     pub fn iter(&self) -> RangeInclusive<i64> {
-        debug_assert!(self.start != self.end);
+        // debug_assert!(self.start != self.end);
         RangeInclusive::new(self.start, self.end)
     }
+
+    pub fn to_rev_ids(&self) -> Vec<i64> {
+        self.iter().collect::<Vec<_>>()
+    }
 }
 
 #[inline]

shared-lib/flowy-collaboration/src/server_folder/folder_manager.rs

@@ -12,7 +12,7 @@ use crate::{
 use async_stream::stream;
 use futures::stream::StreamExt;
 use lib_infra::future::BoxResultFuture;
-use lib_ot::core::PlainTextAttributes;
+use lib_ot::core::PlainAttributes;
 use std::{collections::HashMap, fmt::Debug, sync::Arc};
 use tokio::{
     sync::{mpsc, oneshot, RwLock},
@@ -187,7 +187,7 @@ impl ServerFolderManager {
     }
 }
 
-type FolderRevisionSynchronizer = RevisionSynchronizer<PlainTextAttributes>;
+type FolderRevisionSynchronizer = RevisionSynchronizer<PlainAttributes>;
 
 struct OpenFolderHandler {
     folder_id: String,

shared-lib/flowy-collaboration/src/server_folder/folder_pad.rs

@@ -1,5 +1,5 @@
 use crate::{entities::folder_info::FolderDelta, errors::CollaborateError, synchronizer::RevisionSyncObject};
-use lib_ot::core::{Delta, OperationTransformable, PlainTextAttributes};
+use lib_ot::core::{Delta, OperationTransformable, PlainAttributes};
 
 pub struct ServerFolder {
     folder_id: String,
@@ -15,12 +15,12 @@ impl ServerFolder {
     }
 }
 
-impl RevisionSyncObject<PlainTextAttributes> for ServerFolder {
+impl RevisionSyncObject<PlainAttributes> for ServerFolder {
     fn id(&self) -> &str {
         &self.folder_id
     }
 
-    fn compose(&mut self, other: &Delta<PlainTextAttributes>) -> Result<(), CollaborateError> {
+    fn compose(&mut self, other: &Delta<PlainAttributes>) -> Result<(), CollaborateError> {
         let new_delta = self.delta.compose(other)?;
         self.delta = new_delta;
         Ok(())
@@ -28,8 +28,8 @@ impl RevisionSyncObject<PlainTextAttributes> for ServerFolder {
 
     fn transform(
         &self,
-        other: &Delta<PlainTextAttributes>,
-    ) -> Result<(Delta<PlainTextAttributes>, Delta<PlainTextAttributes>), CollaborateError> {
+        other: &Delta<PlainAttributes>,
+    ) -> Result<(Delta<PlainAttributes>, Delta<PlainAttributes>), CollaborateError> {
         let value = self.delta.transform(other)?;
         Ok(value)
     }
@@ -38,7 +38,7 @@ impl RevisionSyncObject<PlainTextAttributes> for ServerFolder {
         self.delta.to_json()
     }
 
-    fn set_delta(&mut self, new_delta: Delta<PlainTextAttributes>) {
+    fn set_delta(&mut self, new_delta: Delta<PlainAttributes>) {
         self.delta = new_delta;
     }
 }

shared-lib/lib-ot/src/core/delta/builder.rs

@@ -1,6 +1,6 @@
-use crate::core::{trim, Attributes, Delta, PlainTextAttributes};
+use crate::core::{trim, Attributes, Delta, PlainAttributes};
 
-pub type PlainDeltaBuilder = DeltaBuilder<PlainTextAttributes>;
+pub type PlainDeltaBuilder = DeltaBuilder<PlainAttributes>;
 
 pub struct DeltaBuilder<T: Attributes> {
     delta: Delta<T>,

shared-lib/lib-ot/src/core/delta/delta.rs

@@ -13,7 +13,7 @@ use std::{
     str::FromStr,
 };
 
-pub type PlainDelta = Delta<PlainTextAttributes>;
+pub type PlainDelta = Delta<PlainAttributes>;
 
 // TODO: optimize the memory usage with Arc::make_mut or Cow
 #[derive(Clone, Debug, PartialEq, Eq)]

shared-lib/lib-ot/src/core/operation/builder.rs

@@ -1,10 +1,10 @@
 use crate::{
-    core::{Attributes, Operation, PlainTextAttributes},
+    core::{Attributes, Operation, PlainAttributes},
     rich_text::RichTextAttributes,
 };
 
 pub type RichTextOpBuilder = OpBuilder<RichTextAttributes>;
-pub type PlainTextOpBuilder = OpBuilder<PlainTextAttributes>;
+pub type PlainTextOpBuilder = OpBuilder<PlainAttributes>;
 
 pub struct OpBuilder<T: Attributes> {
     ty: Operation<T>,

shared-lib/lib-ot/src/core/operation/operation.rs

@@ -339,14 +339,14 @@ where
 }
 
 #[derive(Debug, Clone, Eq, PartialEq, Default, Serialize, Deserialize)]
-pub struct PlainTextAttributes();
-impl fmt::Display for PlainTextAttributes {
+pub struct PlainAttributes();
+impl fmt::Display for PlainAttributes {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_str("PlainTextAttributes")
+        f.write_str("PlainAttributes")
     }
 }
 
-impl Attributes for PlainTextAttributes {
+impl Attributes for PlainAttributes {
     fn is_empty(&self) -> bool {
         true
     }
@@ -356,7 +356,7 @@ impl Attributes for PlainTextAttributes {
     fn extend_other(&mut self, _other: Self) {}
 }
 
-impl OperationTransformable for PlainTextAttributes {
+impl OperationTransformable for PlainAttributes {
     fn compose(&self, _other: &Self) -> Result<Self, OTError> {
         Ok(self.clone())
     }