Asynchrones Laden der Fälle zu einem Patienten

src/main/java/de/uniluebeck/mi/projmi6/controller/MainController.java

@@ -12,6 +12,7 @@ import javafx.fxml.FXML;
 import javafx.scene.control.*;
 import javafx.util.Callback;
 
+import javax.swing.*;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
@@ -92,8 +93,6 @@ public class MainController {
         return  stammdaten;
     }
 
-
-
     public Callback<Class<?>, Object> getControllerFactory(){
         return controllerFactory;
     }
@@ -137,7 +136,12 @@ public class MainController {
     }
 
 
+    @FXML
+    private Label lvFallPlaceholder;
+
+
 
+    private Task<List<Fall>> loadFallTask = null;
 
 
     @FXML
@@ -149,22 +153,61 @@ public class MainController {
 
 
         patientTablesController.selectedPatientProperty().addListener((observableValue,oldValue,newValue)-> {
-           if(newValue==null){
-               lvFall.setItems(FXCollections.emptyObservableList());
+            lvFall.setItems(null); //clear list
+
+            if(newValue==null){ // If no patient is selected
+               lvFallPlaceholder.setText("Kein Patient ausgew\u00e4hlt!");
                return;
            }
 
-            try {
-                List<Fall> faelle = DBHandler.getFaelleByPatID(newValue.getPatID());
-                System.out.println(faelle);
-                System.out.println("Liste der Faelle hat "+ faelle.size()+ " Eintrage ");
-                lvFall.setItems(FXCollections.observableArrayList(faelle));
-            }catch (Exception e){
-                e.printStackTrace();
+            if(loadFallTask!=null && loadFallTask.isRunning()){
+                loadFallTask.cancel();
             }
+
+
+            loadFallTask = new Task<List<Fall>>() {
+                @Override
+                protected List<Fall> call() throws Exception {
+                    return DBHandler.getFaelleByPatID(newValue.getPatID());
+
+                }
+
+                @Override
+                protected void succeeded() {
+                    super.succeeded();
+                    if(isCancelled()){
+                        System.out.println("Task wurde gecancelt");
+                        return;
+                    }
+                    lvFallPlaceholder.setText("Keine F\u00e4lle vorhanden!");
+                    lvFall.setItems(FXCollections.observableArrayList(getValue()));
+                    decreaseParallelTaskCount();
+                }
+
+                @Override
+                protected void cancelled() {
+                    super.cancelled();
+                    decreaseParallelTaskCount();
+                }
+
+                @Override
+                protected void failed() {
+                    super.failed();
+                    lvFallPlaceholder.setText("Laden fehlgeschlagen!");
+                    lvFall.setItems(null);
+                    decreaseParallelTaskCount();
+                }
+            };
+
+            lvFallPlaceholder.setText("Liste wird geladen...");
+            increaseParallelTaskCount();
+            Thread thread = new Thread(loadFallTask);
+            thread.setDaemon(true);
+            thread.start();
         });
 
 
+
         fallController.fallPropertyProperty().bind(lvFall.getSelectionModel().selectedItemProperty());
 
         lvFall.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);

src/main/resources/main.fxml

@@ -27,7 +27,9 @@
                                                                 <Button fx:id="btnFallCreate" text="Neuen _Fall erstellen" onAction="#clickedCreateFall"/>
                                                             </items>
                                                         </ToolBar>
-                                                        <ListView VBox.vgrow="ALWAYS" fx:id="lvFall" />
+                                                        <ListView VBox.vgrow="ALWAYS" fx:id="lvFall" >
+                                                            <placeholder><Label fx:id="lvFallPlaceholder" /></placeholder>
+                                                        </ListView>
                                                     </children>
                                                 </VBox>
                                                 <TabPane fx:id="tabPaneFall" prefHeight="200.0" prefWidth="200.0" tabClosingPolicy="UNAVAILABLE">