dt Examples for Loaders and Savers

approvaltests-tests/src/test/java/org/approvaltests/demos/LoaderTest.java

@@ -0,0 +1,65 @@
+package org.approvaltests.demos;
+
+import com.spun.util.persistence.Loader;
+import com.spun.util.persistence.Saver;
+
+import java.util.List;
+
+public class LoaderTest {
+    public static class Step1 {
+        // begin-snippet:separating_loaders_1
+        public void reserveItems(List<String> ids) {
+            Item[] items = getInventory();
+            for (Item item : items) {
+                if (ids.contains(item.id) && item.inventoryCount > 0) {
+                    registerHold(item);
+                }
+            }
+        }
+        // end-snippet
+    }
+    public static class Step2 {
+        // begin-snippet:separating_loaders_2
+        public void reserveItems(List<String> ids) {
+            reserveItems(ids, new InventoryLoader(), new ItemReserver());
+        }
+        public void reserveItems(List<String> ids, Loader<Item[]> loader, Saver<Item> itemReserver) {
+            Item[] items = loader.load();
+            for (Item item : items) {
+                if (ids.contains(item.id) && item.inventoryCount > 0) {
+                    itemReserver.save(item);
+                }
+            }
+        }
+        // end-snippet
+
+        public static class InventoryLoader implements Loader<Item[]> {
+            @Override
+            public Item[] load() {
+                return getInventory();
+            }
+        }
+
+        public static class ItemReserver implements Saver<Item> {
+            @Override
+            public Item save(Item save) {
+                registerHold(save);
+                return save;
+            }
+        }
+    }
+
+    private static void registerHold(Item item) {
+
+    }
+
+    private static Item[] getInventory() {
+        Item[] items = new Item[0];
+        return items;
+    }
+
+    private class Item {
+        public String id;
+        public int inventoryCount;
+    }
+}

approvaltests/docs/how_to/EncapsulatingWithLoadersAndSavers.md

@@ -29,5 +29,11 @@ Code->>Database:Put item on hold
 Database->>Code:Confirmation
 ```
 
+The code looks like:
+snippet:separating_loaders_1
+
 
 ## The solution
+
+Refactor it to include loaders and savers
+snippet:separating_loaders_2