Added pagination to folder elements endpoint

Author: Thomasr

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/home/FolderApiService.java

@@ -27,7 +27,7 @@ public interface FolderApiService {
 
     Mono<Void> upsertLastViewTime(@Nullable String folderId);
 
-    Flux<?> getElements(@Nullable String folderId, @Nullable ApplicationType applicationType, @Nullable String name);
+    Flux<?> getElements(@Nullable String folderId, @Nullable ApplicationType applicationType, @Nullable String name, Integer pageNum, Integer pageSize);
 
     Mono<Void> grantPermission(String folderId, Set<String> userIds, Set<String> groupIds, ResourceRole role);
 

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/home/FolderApiServiceImpl.java

@@ -233,8 +233,8 @@ public Mono<Void> upsertLastViewTime(@Nullable String folderId) {
      * @return flux of {@link ApplicationInfoView} or {@link FolderInfoView}
      */
     @Override
-    public Flux<?> getElements(@Nullable String folderId, @Nullable ApplicationType applicationType, @Nullable String name) {
-        return buildApplicationInfoViewTree(applicationType, name)
+    public Flux<?> getElements(@Nullable String folderId, @Nullable ApplicationType applicationType, @Nullable String name, Integer pageNum, Integer pageSize) {
+        var retMono = buildApplicationInfoViewTree(applicationType, name)
                 .flatMap(tree -> {
                     FolderNode<ApplicationInfoView, FolderInfoView> folderNode = tree.get(folderId);
                     if (folderNode == null) {
@@ -264,7 +264,9 @@ public Flux<?> getElements(@Nullable String folderId, @Nullable ApplicationType
                     });
                 })
                 .flatMapIterable(tuple -> tuple.getT1().getChildren())
-                .map(node -> {
+                .skip(pageNum * pageSize);
+        if(pageSize > 0) retMono = retMono.take(pageSize);
+        return retMono.map(node -> {
                     if (node instanceof ElementNode<ApplicationInfoView, FolderInfoView> elementNode) {
                         return elementNode.getSelf();
                     }

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/home/FolderController.java

@@ -70,9 +70,11 @@ public Mono<ResponseView<FolderInfoView>> update(@RequestBody Folder folder) {
     @Override
     public Mono<ResponseView<List<?>>> getElements(@RequestParam(value = "id", required = false) String folderId,
             @RequestParam(value = "applicationType", required = false) ApplicationType applicationType,
-            @RequestParam(required = false) String name) {
+            @RequestParam(required = false) String name,
+            @RequestParam(required = false, defaultValue = "0") Integer pageNum,
+            @RequestParam(required = false, defaultValue = "0") Integer pageSize) {
         String objectId = gidService.convertFolderIdToObjectId(folderId);
-        return folderApiService.getElements(objectId, applicationType, name)
+        return folderApiService.getElements(objectId, applicationType, name, pageNum, pageSize)
                 .collectList()
                 .delayUntil(__ -> folderApiService.upsertLastViewTime(objectId))
                 .map(ResponseView::success);

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/home/FolderEndpoints.java

@@ -70,7 +70,9 @@ public interface FolderEndpoints
     @GetMapping("/elements")
     public Mono<ResponseView<List<?>>> getElements(@RequestParam(value = "id", required = false) String folderId,
             @RequestParam(value = "applicationType", required = false) ApplicationType applicationType,
-			@RequestParam(required = false) String name);
+			@RequestParam(required = false) String name,
+		    @RequestParam(required = false, defaultValue = "0") Integer pageNum,
+		    @RequestParam(required = false, defaultValue = "0") Integer pageSize);
 
 	@Operation(
 			tags = TAG_FOLDER_MANAGEMENT,

server/api-service/lowcoder-server/src/main/java/org/lowcoder/api/home/UserHomeApiServiceImpl.java

@@ -157,7 +157,7 @@ public Mono<UserHomepageView> getUserHomePageView(ApplicationType applicationTyp
                     }
 
                     return organizationService.getById(currentOrgId)
-                            .zipWith(folderApiService.getElements(null, applicationType, null).collectList())
+                            .zipWith(folderApiService.getElements(null, applicationType, null, 0, 0).collectList())
                             .map(tuple2 -> {
                                 Organization organization = tuple2.getT1();
                                 List<?> list = tuple2.getT2();

server/api-service/lowcoder-server/src/test/java/org/lowcoder/api/service/FolderApiServiceTest.java

@@ -137,7 +137,7 @@ public void updateByGid() {
     public void move() {
 
         Mono<? extends List<?>> mono = folderApiService.move("app01", "folder02")
-                .then(folderApiService.getElements("folder02", null, null).collectList());
+                .then(folderApiService.getElements("folder02", null, null, 0, 0).collectList());
 
         StepVerifier.create(mono)
                 .assertNext(list -> {