lahirujayathilake commented on code in PR #47:
URL: 
https://github.com/apache/airavata-data-catalog/pull/47#discussion_r1970362691


##########
data-catalog-api/server/service/src/main/java/org/apache/airavata/datacatalog/api/service/DataCatalogAPIService.java:
##########
@@ -194,20 +194,53 @@ public void searchDataProducts(DataProductSearchRequest 
request,
             StreamObserver<DataProductSearchResponse> responseObserver) {
 
         try {
+            // takeout all the DataProduct
             MetadataSchemaQueryResult searchResult = 
dataCatalogService.searchDataProducts(request.getUserInfo(),
                     request.getSql());
-            List<DataProduct> dataProducts = searchResult.dataProducts();
-            
responseObserver.onNext(DataProductSearchResponse.newBuilder().addAllDataProducts(dataProducts).build());
+            List<DataProduct> allDataProducts = searchResult.dataProducts();
+
+            // if the frontend did not specifyp page / 
page_size,page=1,page_size=20
+            int page = request.getPage();
+            if (page <= 0) {
+                page = 1;
+            }

Review Comment:
   You can update the similar way for the other occurrences too



##########
data-catalog-api/server/service/src/main/java/org/apache/airavata/datacatalog/api/service/DataCatalogAPIService.java:
##########
@@ -194,20 +194,53 @@ public void searchDataProducts(DataProductSearchRequest 
request,
             StreamObserver<DataProductSearchResponse> responseObserver) {
 
         try {
+            // takeout all the DataProduct
             MetadataSchemaQueryResult searchResult = 
dataCatalogService.searchDataProducts(request.getUserInfo(),
                     request.getSql());
-            List<DataProduct> dataProducts = searchResult.dataProducts();
-            
responseObserver.onNext(DataProductSearchResponse.newBuilder().addAllDataProducts(dataProducts).build());
+            List<DataProduct> allDataProducts = searchResult.dataProducts();
+
+            // if the frontend did not specifyp page / 
page_size,page=1,page_size=20
+            int page = request.getPage();
+            if (page <= 0) {
+                page = 1;
+            }

Review Comment:
   you can simplify this
   `int page = request.getPage() > 0 ? page :  1`



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