Defer RPC calls in RpcDataProvider to avoid cache issues (#16505)

This patch defers cache refresh and row adding/removing. These calls are
omitted completely when making initial response to the client or
updating the size with bare ItemSetChangeEvents. 

Change-Id: I6b350680b3e2381caf6a66c9a4ad283207d024dc

2 files changed, 68 insertions, 3 deletions

diff --git a/uitest/src/com/vaadin/tests/components/grid/GridInTabSheet.java b/uitest/src/com/vaadin/tests/components/grid/GridInTabSheet.java
index 6c7f254a0d..cddbd390f2 100644
--- a/uitest/src/com/vaadin/tests/components/grid/GridInTabSheet.java
+++ b/uitest/src/com/vaadin/tests/components/grid/GridInTabSheet.java
@@ -20,6 +20,8 @@ import com.vaadin.tests.components.AbstractTestUI;
 import com.vaadin.ui.Button;
 import com.vaadin.ui.Button.ClickEvent;
 import com.vaadin.ui.Grid;
+import com.vaadin.ui.Grid.CellReference;
+import com.vaadin.ui.Grid.CellStyleGenerator;
 import com.vaadin.ui.Grid.SelectionMode;
 import com.vaadin.ui.Label;
 import com.vaadin.ui.TabSheet;
@@ -36,8 +38,8 @@ public class GridInTabSheet extends AbstractTestUI {
             grid.addRow(i);
         }
 
-        sheet.addTab(grid);
-        sheet.addTab(new Label("Hidden"));
+        sheet.addTab(grid, "Grid");
+        sheet.addTab(new Label("Hidden"), "Label");
 
         addComponent(sheet);
         addComponent(new Button("Add row to Grid", new Button.ClickListener() {
@@ -64,6 +66,28 @@ public class GridInTabSheet extends AbstractTestUI {
                         }
                     }
                 }));
-    }
+        addComponent(new Button("Add CellStyleGenerator",
+                new Button.ClickListener() {
 
+                    @Override
+                    public void buttonClick(ClickEvent event) {
+                        grid.setCellStyleGenerator(new CellStyleGenerator() {
+                            @Override
+                            public String getStyle(CellReference cellReference) {
+                                int rowIndex = ((Integer) cellReference
+                                        .getItemId()).intValue();
+                                Object propertyId = cellReference
+                                        .getPropertyId();
+                                if (rowIndex % 4 == 1) {
+                                    return null;
+                                } else if (rowIndex % 4 == 3
+                                        && "Column 1".equals(propertyId)) {
+                                    return null;
+                                }
+                                return propertyId.toString().replace(' ', '_');
+                            }
+                        });
+                    }
+                }));
+    }
 }
diff --git a/uitest/src/com/vaadin/tests/components/grid/GridInTabSheetTest.java b/uitest/src/com/vaadin/tests/components/grid/GridInTabSheetTest.java
index cd165e4678..168496e9df 100644
--- a/uitest/src/com/vaadin/tests/components/grid/GridInTabSheetTest.java
+++ b/uitest/src/com/vaadin/tests/components/grid/GridInTabSheetTest.java
@@ -23,6 +23,7 @@ import org.junit.Test;
 import com.vaadin.testbench.elements.ButtonElement;
 import com.vaadin.testbench.elements.GridElement;
 import com.vaadin.testbench.elements.NotificationElement;
+import com.vaadin.testbench.elements.TabSheetElement;
 import com.vaadin.tests.annotations.TestCategory;
 import com.vaadin.tests.tb3.MultiBrowserTest;
 
@@ -43,10 +44,45 @@ public class GridInTabSheetTest extends MultiBrowserTest {
             assertEquals("" + (100 + i), getGridElement().getCell(i, 1)
                     .getText());
         }
+
+        assertNoNotification();
+    }
+
+    private void assertNoNotification() {
         assertFalse("There was an unexpected error notification",
                 isElementPresent(NotificationElement.class));
     }
 
+    @Test
+    public void testAddManyRowsWhenGridIsHidden() {
+        setDebug(true);
+        openTestURL();
+
+        TabSheetElement tabsheet = $(TabSheetElement.class).first();
+        tabsheet.openTab("Label");
+        for (int i = 0; i < 50; ++i) {
+            addGridRow();
+        }
+
+        tabsheet.openTab("Grid");
+
+        assertNoNotification();
+    }
+
+    @Test
+    public void testAddCellStyleGeneratorWhenGridIsHidden() {
+        setDebug(true);
+        openTestURL();
+
+        TabSheetElement tabsheet = $(TabSheetElement.class).first();
+        tabsheet.openTab("Label");
+        addCellStyleGenerator();
+
+        tabsheet.openTab("Grid");
+
+        assertNoNotification();
+    }
+
     private void removeGridRow() {
         $(ButtonElement.class).caption("Remove row from Grid").first().click();
     }
@@ -55,6 +91,11 @@ public class GridInTabSheetTest extends MultiBrowserTest {
         $(ButtonElement.class).caption("Add row to Grid").first().click();
     }
 
+    private void addCellStyleGenerator() {
+        $(ButtonElement.class).caption("Add CellStyleGenerator").first()
+                .click();
+    }
+
     private GridElement getGridElement() {
         return $(GridElement.class).first();
     }