Restore open collection tabs: Query, Documents, Settings (#2004)

* Persist query multiple query texts

* Save multiple query tab histories

* Save and restore states for QueryTab and DocumentsTab for SQL and Mongo

* Enable Collection Scale/Settings restore

* Persist documents tab current filter

* Fix DocumentsTab conflict resolve mistake

* Remove unused variable

* Fix e2e test

* Fix e2e localStorage reference

* Try clearing local storage via playwright page

* Clear local storage after opening page

* Move restore flag behind feature flag. Whitelist restorable tabs in for Fabric. Restore e2e tests.

* Fix typo

* Fix: avoid setting undefined for preferredSize for the <Allotment.Pane>

* Add comments

* Move restore tabs after knockout configure step from Explorer constructor (which could be called multiple times)

src/Contracts/ActionContracts.ts

@@ -9,6 +9,7 @@ export enum TabKind {
   Graph,
   SQLQuery,
   ScaleSettings,
+  MongoQuery,
 }
 
 /**
@@ -51,6 +52,8 @@ export interface OpenCollectionTab extends OpenTab {
  */
 export interface OpenQueryTab extends OpenCollectionTab {
   query: QueryInfo;
+  splitterDirection?: "vertical" | "horizontal";
+  queryViewSizePercent?: number;
 }
 
 /**

src/Contracts/ViewModels.ts

@@ -115,7 +115,13 @@ export interface CollectionBase extends TreeNode {
   isSampleCollection?: boolean;
 
   onDocumentDBDocumentsClick(): void;
-  onNewQueryClick(source: any, event?: MouseEvent, queryText?: string): void;
+  onNewQueryClick(
+    source: any,
+    event?: MouseEvent,
+    queryText?: string,
+    splitterDirection?: "horizontal" | "vertical",
+    queryViewSizePercent?: number,
+  ): void;
   expandCollection(): void;
   collapseCollection(): void;
   getDatabase(): Database;
@@ -151,7 +157,13 @@ export interface Collection extends CollectionBase {
   onSettingsClick: () => Promise<void>;
 
   onNewGraphClick(): void;
-  onNewMongoQueryClick(source: any, event?: MouseEvent, queryText?: string): void;
+  onNewMongoQueryClick(
+    source: any,
+    event?: MouseEvent,
+    queryText?: string,
+    splitterDirection?: "horizontal" | "vertical",
+    queryViewSizePercent?: number,
+  ): void;
   onNewMongoShellClick(): void;
   onNewStoredProcedureClick(source: Collection, event?: MouseEvent): void;
   onNewUserDefinedFunctionClick(source: Collection, event?: MouseEvent): void;
@@ -311,6 +323,8 @@ export interface QueryTabOptions extends TabOptions {
   partitionKey?: DataModels.PartitionKey;
   queryText?: string;
   resourceTokenPartitionKey?: string;
+  splitterDirection?: "horizontal" | "vertical";
+  queryViewSizePercent?: number;
 }
 
 export interface ScriptTabOption extends TabOptions {

src/Explorer/Explorer.tsx

@@ -1134,7 +1134,7 @@ export default class Explorer {
     if (userContext.apiType !== "Postgres" && userContext.apiType !== "VCoreMongo") {
       userContext.authType === AuthType.ResourceToken
         ? this.refreshDatabaseForResourceToken()
-        : this.refreshAllDatabases();
+        : await this.refreshAllDatabases(); // await: we rely on the databases to be loaded before restoring the tabs further in the flow
     }
     await useNotebook.getState().refreshNotebooksEnabledStateForAccount();
 

src/Explorer/OpenActions/OpenActions.tsx

@@ -1,4 +1,5 @@
 // TODO convert this file to an action registry in order to have actions and their handlers be more tightly coupled.
+import { configContext, Platform } from "ConfigContext";
 import { useDatabases } from "Explorer/useDatabases";
 import React from "react";
 import { ActionContracts } from "../../Contracts/ExplorerContracts";
@@ -56,6 +57,19 @@ function openCollectionTab(
         continue;
       }
 
+      if (
+        configContext.platform === Platform.Fabric &&
+        !(
+          // whitelist the tab kinds that are allowed to be opened in Fabric
+          (
+            action.tabKind === ActionContracts.TabKind.SQLDocuments ||
+            action.tabKind === ActionContracts.TabKind.SQLQuery
+          )
+        )
+      ) {
+        continue;
+      }
+
       //expand database first if not expanded to load the collections
       if (!database.isDatabaseExpanded?.()) {
         database.expandDatabase?.();
@@ -121,10 +135,28 @@ function openCollectionTab(
             action.tabKind === ActionContracts.TabKind.SQLQuery ||
             action.tabKind === ActionContracts.TabKind[ActionContracts.TabKind.SQLQuery]
           ) {
+            const openQueryTabAction = action as ActionContracts.OpenQueryTab;
             collection.onNewQueryClick(
               collection,
               undefined,
-              generateQueryText(action as ActionContracts.OpenQueryTab, collection.partitionKeyProperties),
+              generateQueryText(openQueryTabAction, collection.partitionKeyProperties),
+              openQueryTabAction.splitterDirection,
+              openQueryTabAction.queryViewSizePercent,
+            );
+            break;
+          }
+
+          if (
+            action.tabKind === ActionContracts.TabKind.MongoQuery ||
+            action.tabKind === ActionContracts.TabKind[ActionContracts.TabKind.MongoQuery]
+          ) {
+            const openQueryTabAction = action as ActionContracts.OpenQueryTab;
+            collection.onNewMongoQueryClick(
+              collection,
+              undefined,
+              generateQueryText(openQueryTabAction, collection.partitionKeyProperties),
+              openQueryTabAction.splitterDirection,
+              openQueryTabAction.queryViewSizePercent,
             );
             break;
           }

src/Explorer/Tabs/DocumentsTabV2/DocumentsTabStateUtil.ts

@@ -3,17 +3,11 @@
 import { ColumnDefinition } from "Explorer/Tabs/DocumentsTabV2/DocumentsTableComponent";
 import {
   AppStateComponentNames,
-  deleteState,
+  deleteSubComponentState,
-  loadState,
+  readSubComponentState,
-  saveState,
+  saveSubComponentState,
-  saveStateDebounced,
 } from "Shared/AppStatePersistenceUtility";
-import { userContext } from "UserContext";
 import * as ViewModels from "../../../Contracts/ViewModels";
-import { Action } from "../../../Shared/Telemetry/TelemetryConstants";
-import * as TelemetryProcessor from "../../../Shared/Telemetry/TelemetryProcessor";
-
-const componentName = AppStateComponentNames.DocumentsTab;
 
 export enum SubComponentName {
   ColumnSizes = "ColumnSizes",
@@ -21,6 +15,7 @@ export enum SubComponentName {
   MainTabDivider = "MainTabDivider",
   ColumnsSelection = "ColumnsSelection",
   ColumnSort = "ColumnSort",
+  CurrentFilter = "CurrentFilter",
 }
 
 export type ColumnSizesMap = { [columnId: string]: WidthDefinition };
@@ -30,84 +25,22 @@ export type TabDivider = { leftPaneWidthPercent: number };
 export type ColumnsSelection = { selectedColumnIds: string[]; columnDefinitions: ColumnDefinition[] };
 export type ColumnSort = { columnId: string; direction: "ascending" | "descending" };
 
-/**
+// Wrap the ...SubComponentState functions for type safety
- *
+
- * @param subComponentName
+export const readDocumentsTabSubComponentState = <T>(
- * @param collection
- * @param defaultValue Will be returned if persisted state is not found
- * @returns
- */
-export const readSubComponentState = <T>(
   subComponentName: SubComponentName,
   collection: ViewModels.CollectionBase,
   defaultValue: T,
-): T => {
+): T => readSubComponentState<T>(AppStateComponentNames.DocumentsTab, subComponentName, collection, defaultValue);
-  const globalAccountName = userContext.databaseAccount?.name;
-  if (!globalAccountName) {
-    const message = "Database account name not found in userContext";
-    console.error(message);
-    TelemetryProcessor.traceFailure(Action.ReadPersistedTabState, { message, componentName });
-    return defaultValue;
-  }
 
-  const state = loadState({
+export const saveDocumentsTabSubComponentState = <T>(
-    componentName: componentName,
-    subComponentName,
-    globalAccountName,
-    databaseName: collection.databaseId,
-    containerName: collection.id(),
-  }) as T;
-
-  return state || defaultValue;
-};
-
-/**
- *
- * @param subComponentName
- * @param collection
- * @param state State to save
- * @param debounce true for high-frequency calls (e.g mouse drag events)
- */
-export const saveSubComponentState = <T>(
   subComponentName: SubComponentName,
   collection: ViewModels.CollectionBase,
   state: T,
   debounce?: boolean,
-): void => {
+): void => saveSubComponentState<T>(AppStateComponentNames.DocumentsTab, subComponentName, collection, state, debounce);
-  const globalAccountName = userContext.databaseAccount?.name;
-  if (!globalAccountName) {
-    const message = "Database account name not found in userContext";
-    console.error(message);
-    TelemetryProcessor.traceFailure(Action.SavePersistedTabState, { message, componentName });
-    return;
-  }
 
-  (debounce ? saveStateDebounced : saveState)(
+export const deleteDocumentsTabSubComponentState = (
-    {
+  subComponentName: SubComponentName,
-      componentName: componentName,
+  collection: ViewModels.CollectionBase,
-      subComponentName,
+) => deleteSubComponentState(AppStateComponentNames.DocumentsTab, subComponentName, collection);
-      globalAccountName,
-      databaseName: collection.databaseId,
-      containerName: collection.id(),
-    },
-    state,
-  );
-};
-
-export const deleteSubComponentState = (subComponentName: SubComponentName, collection: ViewModels.CollectionBase) => {
-  const globalAccountName = userContext.databaseAccount?.name;
-  if (!globalAccountName) {
-    const message = "Database account name not found in userContext";
-    console.error(message);
-    TelemetryProcessor.traceFailure(Action.DeletePersistedTabState, { message, componentName });
-    return;
-  }
-
-  deleteState({
-    componentName: componentName,
-    subComponentName,
-    globalAccountName,
-    databaseName: collection.databaseId,
-    containerName: collection.id(),
-  });
-};

src/Explorer/Tabs/DocumentsTabV2/DocumentsTabV2.tsx

@@ -21,6 +21,7 @@ import { queryDocuments } from "Common/dataAccess/queryDocuments";
 import { readDocument } from "Common/dataAccess/readDocument";
 import { updateDocument } from "Common/dataAccess/updateDocument";
 import { Platform, configContext } from "ConfigContext";
+import { ActionType, OpenCollectionTab, TabKind } from "Contracts/ActionContracts";
 import { CommandButtonComponentProps } from "Explorer/Controls/CommandButton/CommandButtonComponent";
 import { useDialog } from "Explorer/Controls/Dialog";
 import { EditorReact } from "Explorer/Controls/Editor/EditorReact";
@@ -34,8 +35,9 @@ import {
   FilterHistory,
   SubComponentName,
   TabDivider,
-  readSubComponentState,
+  deleteDocumentsTabSubComponentState,
-  saveSubComponentState,
+  readDocumentsTabSubComponentState,
+  saveDocumentsTabSubComponentState,
 } from "Explorer/Tabs/DocumentsTabV2/DocumentsTabStateUtil";
 import { usePrevious } from "Explorer/Tabs/DocumentsTabV2/SelectionHelper";
 import { CosmosFluentProvider, LayoutConstants, cosmosShorthands, tokens } from "Explorer/Theme/ThemeUtil";
@@ -140,6 +142,8 @@ export class DocumentsTabV2 extends TabsBase {
   private title: string;
   private resourceTokenPartitionKey: string;
 
+  protected persistedState: OpenCollectionTab;
+
   constructor(options: ViewModels.DocumentsTabOptions) {
     super(options);
 
@@ -147,6 +151,13 @@ export class DocumentsTabV2 extends TabsBase {
     this.title = options.title;
     this.partitionKey = options.partitionKey;
     this.resourceTokenPartitionKey = options.resourceTokenPartitionKey;
+
+    this.persistedState = {
+      actionType: ActionType.OpenCollectionTab,
+      tabKind: options.isPreferredApiMongoDB ? TabKind.MongoDocuments : TabKind.SQLDocuments,
+      databaseResourceId: options.collection.databaseId,
+      collectionResourceId: options.collection.id(),
+    };
   }
 
   public render(): JSX.Element {
@@ -575,7 +586,10 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
   onIsExecutingChange,
   isTabActive,
 }): JSX.Element => {
-  const [filterContent, setFilterContent] = useState<string>("");
+  const [filterContent, setFilterContent] = useState<string>(() =>
+    readDocumentsTabSubComponentState<string>(SubComponentName.CurrentFilter, _collection, ""),
+  );
+
   const [documentIds, setDocumentIds] = useState<ExtendedDocumentId[]>([]);
   const [isExecuting, setIsExecuting] = useState<boolean>(false);
   const styles = useDocumentsTabStyles();
@@ -606,7 +620,7 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
 
   // State
   const [tabStateData, setTabStateData] = useState<TabDivider>(() =>
-    readSubComponentState<TabDivider>(SubComponentName.MainTabDivider, _collection, {
+    readDocumentsTabSubComponentState<TabDivider>(SubComponentName.MainTabDivider, _collection, {
       leftPaneWidthPercent: 35,
     }),
   );
@@ -621,7 +635,7 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
 
   // User's filter history
   const [lastFilterContents, setLastFilterContents] = useState<FilterHistory>(() =>
-    readSubComponentState<FilterHistory>(SubComponentName.FilterHistory, _collection, [] as FilterHistory),
+    readDocumentsTabSubComponentState<FilterHistory>(SubComponentName.FilterHistory, _collection, [] as FilterHistory),
   );
 
   // For progress bar for bulk delete (noSql)
@@ -763,7 +777,7 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
   };
 
   const [selectedColumnIds, setSelectedColumnIds] = useState<string[]>(() => {
-    const persistedColumnsSelection = readSubComponentState<ColumnsSelection>(
+    const persistedColumnsSelection = readDocumentsTabSubComponentState<ColumnsSelection>(
       SubComponentName.ColumnsSelection,
       _collection,
       undefined,
@@ -808,7 +822,7 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
   useEffect(() => {
     setKeyboardActions({
       [KeyboardAction.CLEAR_SEARCH]: () => {
-        setFilterContent("");
+        updateFilterContent("");
         refreshDocumentsGrid(true);
         return true;
       },
@@ -1645,7 +1659,7 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
 
   // Column definition is a map<id, ColumnDefinition> to garantee uniqueness
   const [columnDefinitions, setColumnDefinitions] = useState<ColumnDefinition[]>(() => {
-    const persistedColumnsSelection = readSubComponentState<ColumnsSelection>(
+    const persistedColumnsSelection = readDocumentsTabSubComponentState<ColumnsSelection>(
       SubComponentName.ColumnsSelection,
       _collection,
       undefined,
@@ -1956,7 +1970,7 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
     const limitedLastFilterContents = lastFilterContents.slice(0, MAX_FILTER_HISTORY_COUNT);
 
     setLastFilterContents(limitedLastFilterContents);
-    saveSubComponentState<FilterHistory>(SubComponentName.FilterHistory, _collection, lastFilterContents);
+    saveDocumentsTabSubComponentState<FilterHistory>(SubComponentName.FilterHistory, _collection, lastFilterContents);
   };
 
   const refreshDocumentsGrid = useCallback(
@@ -2013,7 +2027,7 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
 
     setSelectedColumnIds(newSelectedColumnIds);
 
-    saveSubComponentState<ColumnsSelection>(SubComponentName.ColumnsSelection, _collection, {
+    saveDocumentsTabSubComponentState<ColumnsSelection>(SubComponentName.ColumnsSelection, _collection, {
       selectedColumnIds: newSelectedColumnIds,
       columnDefinitions,
     });
@@ -2063,6 +2077,15 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
     return options;
   };
 
+  const updateFilterContent = (filter: string): void => {
+    if (filter === "" || filter === undefined) {
+      deleteDocumentsTabSubComponentState(SubComponentName.CurrentFilter, _collection);
+    } else {
+      saveDocumentsTabSubComponentState<string>(SubComponentName.CurrentFilter, _collection, filter, true);
+    }
+    setFilterContent(filter);
+  };
+
   return (
     <CosmosFluentProvider className={styles.container}>
       <div className="tab-pane active" role="tabpanel" style={{ display: "flex" }}>
@@ -2077,7 +2100,7 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
             }
             title="Type a query predicate or choose one from the list."
             value={filterContent}
-            onChange={(value) => setFilterContent(value)}
+            onChange={updateFilterContent}
             onKeyDown={onFilterKeyDown}
             bottomLink={{ text: "Learn more", url: DATA_EXPLORER_DOC_URL }}
           />
@@ -2103,7 +2126,7 @@ export const DocumentsTabComponent: React.FunctionComponent<IDocumentsTabCompone
         <Allotment
           onDragEnd={(sizes: number[]) => {
             tabStateData.leftPaneWidthPercent = (100 * sizes[0]) / (sizes[0] + sizes[1]);
-            saveSubComponentState<TabDivider>(SubComponentName.MainTabDivider, _collection, tabStateData);
+            saveDocumentsTabSubComponentState<TabDivider>(SubComponentName.MainTabDivider, _collection, tabStateData);
             setTabStateData(tabStateData);
           }}
         >

src/Explorer/Tabs/DocumentsTabV2/DocumentsTableComponent.tsx

@@ -42,9 +42,9 @@ import { TableColumnSelectionPane } from "Explorer/Panes/TableColumnSelectionPan
 import {
   ColumnSizesMap,
   ColumnSort,
-  deleteSubComponentState,
+  deleteDocumentsTabSubComponentState,
-  readSubComponentState,
+  readDocumentsTabSubComponentState,
-  saveSubComponentState,
+  saveDocumentsTabSubComponentState,
   SubComponentName,
 } from "Explorer/Tabs/DocumentsTabV2/DocumentsTabStateUtil";
 import { INITIAL_SELECTED_ROW_INDEX, useDocumentsTabStyles } from "Explorer/Tabs/DocumentsTabV2/DocumentsTabV2";
@@ -118,7 +118,11 @@ export const DocumentsTableComponent: React.FC<IDocumentsTableComponentProps> =
   const sortedRowsRef = React.useRef(null);
 
   const [columnSizingOptions, setColumnSizingOptions] = React.useState<TableColumnSizingOptions>(() => {
-    const columnSizesMap: ColumnSizesMap = readSubComponentState(SubComponentName.ColumnSizes, collection, {});
+    const columnSizesMap: ColumnSizesMap = readDocumentsTabSubComponentState(
+      SubComponentName.ColumnSizes,
+      collection,
+      {},
+    );
     const columnSizesPx: TableColumnSizingOptions = {};
     selectedColumnIds.forEach((columnId) => {
       if (
@@ -142,7 +146,7 @@ export const DocumentsTableComponent: React.FC<IDocumentsTableComponentProps> =
     sortDirection: "ascending" | "descending";
     sortColumn: TableColumnId | undefined;
   }>(() => {
-    const sort = readSubComponentState<ColumnSort>(SubComponentName.ColumnSort, collection, undefined);
+    const sort = readDocumentsTabSubComponentState<ColumnSort>(SubComponentName.ColumnSort, collection, undefined);
 
     if (!sort) {
       return {
@@ -174,7 +178,12 @@ export const DocumentsTableComponent: React.FC<IDocumentsTableComponentProps> =
         return acc;
       }, {} as ColumnSizesMap);
 
-      saveSubComponentState<ColumnSizesMap>(SubComponentName.ColumnSizes, collection, persistentSizes, true);
+      saveDocumentsTabSubComponentState<ColumnSizesMap>(
+        SubComponentName.ColumnSizes,
+        collection,
+        persistentSizes,
+        true,
+      );
 
       return newSizingOptions;
     });
@@ -186,11 +195,14 @@ export const DocumentsTableComponent: React.FC<IDocumentsTableComponentProps> =
     setColumnSort(event, columnId, direction);
 
     if (columnId === undefined || direction === undefined) {
-      deleteSubComponentState(SubComponentName.ColumnSort, collection);
+      deleteDocumentsTabSubComponentState(SubComponentName.ColumnSort, collection);
       return;
     }
 
-    saveSubComponentState<ColumnSort>(SubComponentName.ColumnSort, collection, { columnId, direction });
+    saveDocumentsTabSubComponentState<ColumnSort>(SubComponentName.ColumnSort, collection, {
+      columnId,
+      direction,
+    });
   };
 
   // Columns must be a static object and cannot change on re-renders otherwise React will complain about too many refreshes

src/Explorer/Tabs/MongoQueryTab/MongoQueryTab.tsx

@@ -1,3 +1,4 @@
+import { ActionType, TabKind } from "Contracts/ActionContracts";
 import React from "react";
 import MongoUtility from "../../../Common/MongoUtility";
 import * as ViewModels from "../../../Contracts/ViewModels";
@@ -20,7 +21,7 @@ export class NewMongoQueryTab extends NewQueryTab {
     private mongoQueryTabProps: IMongoQueryTabProps,
   ) {
     super(options, mongoQueryTabProps);
-    this.queryText = "";
+    this.queryText = options.queryText ?? "";
     this.iMongoQueryTabComponentProps = {
       collection: options.collection,
       isExecutionError: this.isExecutionError(),
@@ -28,6 +29,8 @@ export class NewMongoQueryTab extends NewQueryTab {
       tabsBaseInstance: this,
       queryText: this.queryText,
       partitionKey: this.partitionKey,
+      splitterDirection: options.splitterDirection,
+      queryViewSizePercent: options.queryViewSizePercent,
       container: this.mongoQueryTabProps.container,
       onTabAccessor: (instance: ITabAccessor): void => {
         this.iTabAccessor = instance;
@@ -35,6 +38,26 @@ export class NewMongoQueryTab extends NewQueryTab {
       isPreferredApiMongoDB: true,
       monacoEditorSetting: "plaintext",
       viewModelcollection: this.mongoQueryTabProps.viewModelcollection,
+      onUpdatePersistedState: (state: {
+        queryText: string;
+        splitterDirection: string;
+        queryViewSizePercent: number;
+      }): void => {
+        this.persistedState = {
+          actionType: ActionType.OpenCollectionTab,
+          tabKind: TabKind.SQLQuery,
+          databaseResourceId: options.collection.databaseId,
+          collectionResourceId: options.collection.id(),
+          query: {
+            text: state.queryText,
+          },
+          splitterDirection: state.splitterDirection as "vertical" | "horizontal",
+          queryViewSizePercent: state.queryViewSizePercent,
+        };
+        if (this.triggerPersistState) {
+          this.triggerPersistState();
+        }
+      },
     };
   }
 

src/Explorer/Tabs/QueryTab/QueryTab.tsx

@@ -1,4 +1,5 @@
 import { sendMessage } from "Common/MessageHandler";
+import { ActionType, OpenQueryTab, TabKind } from "Contracts/ActionContracts";
 import { MessageTypes } from "Contracts/MessageTypes";
 import { CopilotProvider } from "Explorer/QueryCopilot/QueryCopilotContext";
 import { userContext } from "UserContext";
@@ -26,6 +27,8 @@ export class NewQueryTab extends TabsBase {
   public iQueryTabComponentProps: IQueryTabComponentProps;
   public iTabAccessor: ITabAccessor;
 
+  protected persistedState: OpenQueryTab;
+
   constructor(
     options: QueryTabOptions,
     private props: IQueryTabProps,
@@ -39,12 +42,41 @@ export class NewQueryTab extends TabsBase {
       tabsBaseInstance: this,
       queryText: options.queryText,
       partitionKey: this.partitionKey,
+      splitterDirection: options.splitterDirection,
+      queryViewSizePercent: options.queryViewSizePercent,
       container: this.props.container,
       onTabAccessor: (instance: ITabAccessor): void => {
         this.iTabAccessor = instance;
       },
       isPreferredApiMongoDB: false,
+      onUpdatePersistedState: (state: {
+        queryText: string;
+        splitterDirection: string;
+        queryViewSizePercent: number;
+      }): void => {
+        this.persistedState = {
+          actionType: ActionType.OpenCollectionTab,
+          tabKind: TabKind.SQLQuery,
+          databaseResourceId: options.collection.databaseId,
+          collectionResourceId: options.collection.id(),
+          query: {
+            text: state.queryText,
+          },
+          splitterDirection: state.splitterDirection as "vertical" | "horizontal",
+          queryViewSizePercent: state.queryViewSizePercent,
         };
+        if (this.triggerPersistState) {
+          this.triggerPersistState();
+        }
+      },
+    };
+
+    // set initial state
+    this.iQueryTabComponentProps.onUpdatePersistedState({
+      queryText: options.queryText,
+      splitterDirection: options.splitterDirection,
+      queryViewSizePercent: options.queryViewSizePercent,
+    });
   }
 
   public render(): JSX.Element {

src/Explorer/Tabs/QueryTab/QueryTabComponent.test.tsx

@@ -34,6 +34,7 @@ jest.mock("Shared/AppStatePersistenceUtility", () => ({
   AppStateComponentNames: {
     QueryCopilot: "QueryCopilot",
   },
+  readSubComponentState: jest.fn(),
 }));
 
 describe("QueryTabComponent", () => {

src/Explorer/Tabs/QueryTab/QueryTabComponent.tsx

@@ -18,13 +18,7 @@ import { CosmosFluentProvider } from "Explorer/Theme/ThemeUtil";
 import { useSelectedNode } from "Explorer/useSelectedNode";
 import { KeyboardAction } from "KeyboardShortcuts";
 import { QueryConstants } from "Shared/Constants";
-import {
+import { LocalStorageUtility, StorageKey, getRUThreshold, ruThresholdEnabled } from "Shared/StorageUtility";
-  LocalStorageUtility,
-  StorageKey,
-  getDefaultQueryResultsView,
-  getRUThreshold,
-  ruThresholdEnabled,
-} from "Shared/StorageUtility";
 import { Action } from "Shared/Telemetry/TelemetryConstants";
 import { Allotment } from "allotment";
 import { QueryCopilotState, useQueryCopilot } from "hooks/useQueryCopilot";
@@ -99,6 +93,13 @@ export interface IQueryTabComponentProps {
   copilotEnabled?: boolean;
   isSampleCopilotActive?: boolean;
   copilotStore?: Partial<QueryCopilotState>;
+  splitterDirection?: "horizontal" | "vertical";
+  queryViewSizePercent?: number;
+  onUpdatePersistedState: (state: {
+    queryText: string;
+    splitterDirection: "vertical" | "horizontal";
+    queryViewSizePercent: number;
+  }) => void;
 }
 
 interface IQueryTabStates {
@@ -118,11 +119,13 @@ interface IQueryTabStates {
   queryResultsView: SplitterDirection;
   errors?: QueryError[];
   modelMarkers?: monaco.editor.IMarkerData[];
+  queryViewSizePercent: number;
 }
 
 export const QueryTabCopilotComponent = (props: IQueryTabComponentProps): any => {
   const styles = useQueryTabStyles();
   const copilotStore = useCopilotStore();
+
   const isSampleCopilotActive = useSelectedNode.getState().isQueryCopilotCollectionSelected();
   const queryTabProps = {
     ...props,
@@ -132,12 +135,12 @@ export const QueryTabCopilotComponent = (props: IQueryTabComponentProps): any =>
     isSampleCopilotActive: isSampleCopilotActive,
     copilotStore: copilotStore,
   };
-  return <QueryTabComponentImpl styles={styles} {...queryTabProps}></QueryTabComponentImpl>;
+  return <QueryTabComponentImpl styles={styles} {...queryTabProps} />;
 };
 
 export const QueryTabComponent = (props: IQueryTabComponentProps): any => {
   const styles = useQueryTabStyles();
-  return <QueryTabComponentImpl styles={styles} {...props}></QueryTabComponentImpl>;
+  return <QueryTabComponentImpl styles={styles} {...{ ...props }} />;
 };
 
 type QueryTabComponentImplProps = IQueryTabComponentProps & {
@@ -146,6 +149,8 @@ type QueryTabComponentImplProps = IQueryTabComponentProps & {
 
 // Inner (legacy) class component. We only use this component via one of the two functional components above (since we need to use the `useQueryTabStyles` hook).
 class QueryTabComponentImpl extends React.Component<QueryTabComponentImplProps, IQueryTabStates> {
+  private static readonly DEBOUNCE_DELAY_MS = 1000;
+
   public queryEditorId: string;
   public executeQueryButton: Button;
   public saveQueryButton: Button;
@@ -157,10 +162,10 @@ class QueryTabComponentImpl extends React.Component<QueryTabComponentImplProps,
   private _iterator: MinimalQueryIterator;
   private queryAbortController: AbortController;
   queryEditor: React.RefObject<EditorReact>;
+  private timeoutId: NodeJS.Timeout | undefined;
 
   constructor(props: QueryTabComponentImplProps) {
     super(props);
-
     this.queryEditor = createRef<EditorReact>();
 
     this.state = {
@@ -176,7 +181,9 @@ class QueryTabComponentImpl extends React.Component<QueryTabComponentImplProps,
       cancelQueryTimeoutID: undefined,
       copilotActive: this._queryCopilotActive(),
       currentTabActive: true,
-      queryResultsView: getDefaultQueryResultsView(),
+      queryResultsView:
+        props.splitterDirection === "vertical" ? SplitterDirection.Vertical : SplitterDirection.Horizontal,
+      queryViewSizePercent: props.queryViewSizePercent,
     };
     this.isCloseClicked = false;
     this.splitterId = this.props.tabId + "_splitter";
@@ -207,6 +214,23 @@ class QueryTabComponentImpl extends React.Component<QueryTabComponentImplProps,
     });
   }
 
+  /**
+   * Helper function to save the query text in the query tab state
+   * Since it reads and writes to the same state, it is debounced
+   */
+  private saveQueryTabStateDebounced = () => {
+    if (this.timeoutId) {
+      clearTimeout(this.timeoutId);
+    }
+    this.timeoutId = setTimeout(async () => {
+      this.props.onUpdatePersistedState({
+        queryText: this.state.sqlQueryEditorContent,
+        splitterDirection: this.state.queryResultsView,
+        queryViewSizePercent: this.state.queryViewSizePercent,
+      });
+    }, QueryTabComponentImpl.DEBOUNCE_DELAY_MS);
+  };
+
   private _queryCopilotActive(): boolean {
     if (this.props.copilotEnabled) {
       return readCopilotToggleStatus(userContext.databaseAccount);
@@ -567,7 +591,7 @@ class QueryTabComponentImpl extends React.Component<QueryTabComponentImplProps,
     };
   }
   private _setViewLayout(direction: SplitterDirection): void {
-    this.setState({ queryResultsView: direction });
+    this.setState({ queryResultsView: direction }, () => this.saveQueryTabStateDebounced());
 
     // We'll need to refresh the context buttons to update the selected state of the view buttons
     setTimeout(() => {
@@ -599,13 +623,16 @@ class QueryTabComponentImpl extends React.Component<QueryTabComponentImplProps,
     if (this.state.copilotActive) {
       this.props.copilotStore?.setQuery(newContent);
     }
-    this.setState({
+    this.setState(
+      {
         sqlQueryEditorContent: newContent,
         queryCopilotGeneratedQuery: "",
 
         // Clear the markers when the user edits the document.
         modelMarkers: [],
-    });
+      },
+      () => this.saveQueryTabStateDebounced(),
+    );
     if (this.isPreferredApiMongoDB) {
       if (newContent.length > 0) {
         this.executeQueryButton = {
@@ -704,8 +731,20 @@ class QueryTabComponentImpl extends React.Component<QueryTabComponentImplProps,
             ></QueryCopilotPromptbar>
           )}
           {/* Set 'key' to the value of vertical to force re-rendering when vertical changes, to work around https://github.com/johnwalley/allotment/issues/457 */}
-          <Allotment key={vertical.toString()} vertical={vertical}>
+          <Allotment
-            <Allotment.Pane data-test="QueryTab/EditorPane">
+            key={vertical.toString()}
+            vertical={vertical}
+            onDragEnd={(sizes: number[]) => {
+              const queryViewSizePercent = (100 * sizes[0]) / (sizes[0] + sizes[1]);
+              this.setState({ queryViewSizePercent }, () => this.saveQueryTabStateDebounced());
+            }}
+          >
+            <Allotment.Pane
+              data-test="QueryTab/EditorPane"
+              preferredSize={
+                this.state.queryViewSizePercent !== undefined ? `${this.state.queryViewSizePercent}%` : undefined
+              }
+            >
               <EditorReact
                 ref={this.queryEditor}
                 className={this.props.styles.queryEditor}

src/Explorer/Tabs/SettingsTabV2.tsx

@@ -1,3 +1,4 @@
+import { ActionType, OpenCollectionTab, TabKind } from "Contracts/ActionContracts";
 import React from "react";
 import * as ViewModels from "../../Contracts/ViewModels";
 import { SettingsComponent } from "../Controls/Settings/SettingsComponent";
@@ -10,6 +11,18 @@ export class SettingsTabV2 extends TabsBase {
 }
 
 export class CollectionSettingsTabV2 extends SettingsTabV2 {
+  protected persistedState: OpenCollectionTab;
+
+  constructor(options: ViewModels.TabOptions) {
+    super(options);
+    this.persistedState = {
+      actionType: ActionType.OpenCollectionTab,
+      tabKind: TabKind.ScaleSettings,
+      databaseResourceId: options.collection.databaseId,
+      collectionResourceId: options.collection.id(),
+    };
+  }
+
   public onActivate(): void {
     super.onActivate();
     this.collection.selectedSubnodeKind(ViewModels.CollectionTabKind.CollectionSettingsV2);

src/Explorer/Tabs/TabsBase.ts

@@ -1,3 +1,4 @@
+import { OpenTab } from "Contracts/ActionContracts";
 import { KeyboardActionGroup, clearKeyboardActionGroup } from "KeyboardShortcuts";
 import * as ko from "knockout";
 import * as Constants from "../../Common/Constants";
@@ -30,6 +31,8 @@ export default class TabsBase extends WaitsForTemplateViewModel {
   protected _theme: string;
   public onLoadStartKey: number;
 
+  protected persistedState: OpenTab | undefined = undefined; // Used to store state of tab for persistence
+
   constructor(options: ViewModels.TabOptions) {
     super();
     this.index = options.index;
@@ -55,6 +58,10 @@ export default class TabsBase extends WaitsForTemplateViewModel {
     };
   }
 
+  // Called by useTabs to persist
+  public getPersistedState = (): OpenTab | null => this.persistedState;
+  public triggerPersistState: () => void = undefined;
+
   public onCloseTabButtonClick(): void {
     useTabs.getState().closeTab(this);
     TelemetryProcessor.trace(Action.Tab, ActionModifiers.Close, {

src/Explorer/Tree/Collection.ts

@@ -630,7 +630,13 @@ export default class Collection implements ViewModels.Collection {
     }
   };
 
-  public onNewQueryClick(source: any, event: MouseEvent, queryText?: string) {
+  public onNewQueryClick(
+    source: any,
+    event: MouseEvent,
+    queryText?: string,
+    splitterDirection?: "horizontal" | "vertical",
+    queryViewSizePercent?: number,
+  ) {
     const collection: ViewModels.Collection = source.collection || source;
     const id = useTabs.getState().getTabs(ViewModels.CollectionTabKind.Query).length + 1;
     const title = "Query " + id;
@@ -653,13 +659,21 @@ export default class Collection implements ViewModels.Collection {
           queryText: queryText,
           partitionKey: collection.partitionKey,
           onLoadStartKey: startKey,
+          splitterDirection,
+          queryViewSizePercent,
         },
         { container: this.container },
       ),
     );
   }
 
-  public onNewMongoQueryClick(source: any, event: MouseEvent, queryText?: string) {
+  public onNewMongoQueryClick(
+    source: any,
+    event: MouseEvent,
+    queryText?: string,
+    splitterDirection?: "horizontal" | "vertical",
+    queryViewSizePercent?: number,
+  ) {
     const collection: ViewModels.Collection = source.collection || source;
     const id = useTabs.getState().getTabs(ViewModels.CollectionTabKind.Query).length + 1;
 
@@ -681,6 +695,9 @@ export default class Collection implements ViewModels.Collection {
         node: this,
         partitionKey: collection.partitionKey,
         onLoadStartKey: startKey,
+        queryText,
+        splitterDirection,
+        queryViewSizePercent,
       },
       {
         container: this.container,

src/Platform/Hosted/extractFeatures.ts

@@ -38,6 +38,7 @@ export type Features = {
   readonly copilotChatFixedMonacoEditorHeight: boolean;
   readonly enablePriorityBasedExecution: boolean;
   readonly disableConnectionStringLogin: boolean;
+  readonly restoreTabs: boolean;
 
   // can be set via both flight and feature flag
   autoscaleDefault: boolean;
@@ -108,6 +109,7 @@ export function extractFeatures(given = new URLSearchParams(window.location.sear
     copilotChatFixedMonacoEditorHeight: "true" === get("copilotchatfixedmonacoeditorheight"),
     enablePriorityBasedExecution: "true" === get("enableprioritybasedexecution"),
     disableConnectionStringLogin: "true" === get("disableconnectionstringlogin"),
+    restoreTabs: "true" === get("restoretabs"),
   };
 }
 

src/Shared/AppStatePersistenceUtility.ts

@@ -1,12 +1,20 @@
 import { LocalStorageUtility, StorageKey } from "Shared/StorageUtility";
+import { Action } from "Shared/Telemetry/TelemetryConstants";
+import { userContext } from "UserContext";
+import * as ViewModels from "../Contracts/ViewModels";
+import * as TelemetryProcessor from "../Shared/Telemetry/TelemetryProcessor";
 
 // The component name whose state is being saved. Component name must not include special characters.
 export enum AppStateComponentNames {
   DocumentsTab = "DocumentsTab",
   MostRecentActivity = "MostRecentActivity",
   QueryCopilot = "QueryCopilot",
+  DataExplorerAction = "DataExplorerAction",
 }
 
+// Subcomponent for DataExplorerAction
+export const OPEN_TABS_SUBCOMPONENT_NAME = "OpenTabs";
+
 export const PATH_SEPARATOR = "/"; // export for testing purposes
 const SCHEMA_VERSION = 1;
 
@@ -72,12 +80,18 @@ export const hasState = (path: StorePath): boolean => {
 };
 
 // This is for high-frequency state changes
-let timeoutId: NodeJS.Timeout | undefined;
+// Keep track of timeouts per path
+const pathToTimeoutIdMap = new Map<string, NodeJS.Timeout>();
 export const saveStateDebounced = (path: StorePath, state: unknown, debounceDelayMs = 1000): void => {
+  const key = createKeyFromPath(path);
+  const timeoutId = pathToTimeoutIdMap.get(key);
   if (timeoutId) {
     clearTimeout(timeoutId);
   }
-  timeoutId = setTimeout(() => saveState(path, state), debounceDelayMs);
+  pathToTimeoutIdMap.set(
+    key,
+    setTimeout(() => saveState(path, state), debounceDelayMs),
+  );
 };
 
 interface ApplicationState {
@@ -112,3 +126,93 @@ export const createKeyFromPath = (path: StorePath): string => {
 export const deleteAllStates = (): void => {
   LocalStorageUtility.removeEntry(StorageKey.AppState);
 };
+
+// Convenience functions
+
+/**
+ *
+ * @param subComponentName
+ * @param collection
+ * @param defaultValue Will be returned if persisted state is not found
+ * @returns
+ */
+export const readSubComponentState = <T>(
+  componentName: AppStateComponentNames,
+  subComponentName: string,
+  collection: ViewModels.CollectionBase | undefined,
+  defaultValue: T,
+): T => {
+  const globalAccountName = userContext.databaseAccount?.name;
+  if (!globalAccountName) {
+    const message = "Database account name not found in userContext";
+    console.error(message);
+    TelemetryProcessor.traceFailure(Action.ReadPersistedTabState, { message, componentName });
+    return defaultValue;
+  }
+
+  const state = loadState({
+    componentName: componentName,
+    subComponentName,
+    globalAccountName,
+    databaseName: collection ? collection.databaseId : "",
+    containerName: collection ? collection.id() : "",
+  }) as T;
+
+  return state || defaultValue;
+};
+
+/**
+ *
+ * @param subComponentName
+ * @param collection
+ * @param state State to save
+ * @param debounce true for high-frequency calls (e.g mouse drag events)
+ */
+export const saveSubComponentState = <T>(
+  componentName: AppStateComponentNames,
+  subComponentName: string,
+  collection: ViewModels.CollectionBase | undefined,
+  state: T,
+  debounce?: boolean,
+): void => {
+  const globalAccountName = userContext.databaseAccount?.name;
+  if (!globalAccountName) {
+    const message = "Database account name not found in userContext";
+    console.error(message);
+    TelemetryProcessor.traceFailure(Action.SavePersistedTabState, { message, componentName });
+    return;
+  }
+
+  (debounce ? saveStateDebounced : saveState)(
+    {
+      componentName: componentName,
+      subComponentName,
+      globalAccountName,
+      databaseName: collection ? collection.databaseId : "",
+      containerName: collection ? collection.id() : "",
+    },
+    state,
+  );
+};
+
+export const deleteSubComponentState = (
+  componentName: AppStateComponentNames,
+  subComponentName: string,
+  collection: ViewModels.CollectionBase,
+) => {
+  const globalAccountName = userContext.databaseAccount?.name;
+  if (!globalAccountName) {
+    const message = "Database account name not found in userContext";
+    console.error(message);
+    TelemetryProcessor.traceFailure(Action.DeletePersistedTabState, { message, componentName });
+    return;
+  }
+
+  deleteState({
+    componentName: componentName,
+    subComponentName,
+    globalAccountName,
+    databaseName: collection.databaseId,
+    containerName: collection.id(),
+  });
+};

src/hooks/useKnockoutExplorer.ts

@@ -7,6 +7,11 @@ import Explorer from "Explorer/Explorer";
 import { useDataPlaneRbac } from "Explorer/Panes/SettingsPane/SettingsPane";
 import { useSelectedNode } from "Explorer/useSelectedNode";
 import { scheduleRefreshDatabaseResourceToken } from "Platform/Fabric/FabricUtil";
+import {
+  AppStateComponentNames,
+  OPEN_TABS_SUBCOMPONENT_NAME,
+  readSubComponentState,
+} from "Shared/AppStatePersistenceUtility";
 import { LocalStorageUtility, StorageKey } from "Shared/StorageUtility";
 import { useNewPortalBackendEndpoint } from "Utils/EndpointUtils";
 import { getNetworkSettingsWarningMessage } from "Utils/NetworkUtility";
@@ -80,6 +85,11 @@ export function useKnockoutExplorer(platform: Platform): Explorer {
           await updateContextForCopilot(explorer);
           await updateContextForSampleData(explorer);
         }
+
+        if (userContext.features.restoreTabs) {
+          restoreOpenTabs();
+        }
+
         setExplorer(explorer);
       }
     };
@@ -816,3 +826,17 @@ async function updateContextForSampleData(explorer: Explorer): Promise<void> {
 interface SampledataconnectionResponse {
   connectionString: string;
 }
+
+const restoreOpenTabs = () => {
+  const openTabsState = readSubComponentState<(DataExplorerAction | undefined)[]>(
+    AppStateComponentNames.DataExplorerAction,
+    OPEN_TABS_SUBCOMPONENT_NAME,
+    undefined,
+    [],
+  );
+  openTabsState.forEach((openTabState) => {
+    if (openTabState) {
+      handleOpenAction(openTabState, useDatabases.getState().databases, this);
+    }
+  });
+};

src/hooks/useTabs.ts

@@ -1,5 +1,11 @@
 import { clamp } from "@fluentui/react";
+import { OpenTab } from "Contracts/ActionContracts";
 import { useSelectedNode } from "Explorer/useSelectedNode";
+import {
+  AppStateComponentNames,
+  OPEN_TABS_SUBCOMPONENT_NAME,
+  saveSubComponentState,
+} from "Shared/AppStatePersistenceUtility";
 import create, { UseStore } from "zustand";
 import * as ViewModels from "../Contracts/ViewModels";
 import { CollectionTabKind } from "../Contracts/ViewModels";
@@ -36,6 +42,7 @@ export interface TabsState {
   selectLeftTab: () => void;
   selectRightTab: () => void;
   closeActiveTab: () => void;
+  persistTabsState: () => void;
 }
 
 export enum ReactTabKind {
@@ -73,7 +80,9 @@ export const useTabs: UseStore<TabsState> = create((set, get) => ({
   },
   activateNewTab: (tab: TabsBase): void => {
     set((state) => ({ openedTabs: [...state.openedTabs, tab], activeTab: tab, activeReactTab: undefined }));
+    tab.triggerPersistState = get().persistTabsState;
     tab.onActivate();
+    get().persistTabsState();
   },
   activateReactTab: (tabKind: ReactTabKind): void => {
     // Clear the selected node when switching to a react tab.
@@ -130,6 +139,8 @@ export const useTabs: UseStore<TabsState> = create((set, get) => ({
     }
 
     set({ openedTabs: updatedTabs });
+
+    get().persistTabsState();
   },
   closeAllNotebookTabs: (hardClose): void => {
     const isNotebook = (tabKind: CollectionTabKind): boolean => {
@@ -226,4 +237,15 @@ export const useTabs: UseStore<TabsState> = create((set, get) => ({
       state.closeTab(state.activeTab);
     }
   },
+  persistTabsState: () => {
+    const state = get();
+    const openTabsStates = state.openedTabs.map((tab) => tab.getPersistedState());
+
+    saveSubComponentState<OpenTab[]>(
+      AppStateComponentNames.DataExplorerAction,
+      OPEN_TABS_SUBCOMPONENT_NAME,
+      undefined,
+      openTabsStates,
+    );
+  },
 }));