2024-09-05 17:12:06.587562 new snippets

seeker/report.txt

@@ -1,3 +1,36 @@
+--------------------------------------------------------------------------------
+ 2024-09-05 17:12:06.587562
+--------------------------------------------------------------------------------
+  On branch main
+Your branch is up to date with 'origin/main'.
+
+Changes not staged for commit:
+  (use "git add/rm <file>..." to update what will be committed)
+  (use "git restore <file>..." to discard changes in working directory)
+	deleted:    snippet/ST_Point_table_from_csv.py
+	deleted:    snippet/ascii-smuggler.py
+	deleted:    snippet/bump
+	deleted:    snippet/context_builder.py
+	deleted:    snippet/dd.java
+	deleted:    snippet/function.sh
+	deleted:    snippet/instala_ccd_serpro_ubuntu.sh
+	deleted:    snippet/login_to_google.py
+	deleted:    snippet/polygon_table_from_datafile.py
+	deleted:    snippet/sedona_df_to_geopandas.py
+	deleted:    snippet/spatial_joins.py
+
+Untracked files:
+  (use "git add <file>..." to include in what will be committed)
+	snippet/IntroduceStaticSetter.java
+	snippet/IntroduceStaticSetter1.java
+	snippet/ReplaceGlobalReferenceWithGetter2.java
+	snippet/executor.py
+	snippet/mini_01_gugudan.java
+	snippet/snowpark_session.py
+	snippet/tap-linux.py
+
+no changes added to commit (use "git add" and/or "git commit -a")
+
 --------------------------------------------------------------------------------
  2024-09-04 17:12:46.040880
 --------------------------------------------------------------------------------

seeker/snippet/IntroduceStaticSetter.java

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+//date: 2024-09-05T16:52:22Z
+//url: https://api.github.com/gists/b9c886d5f45c4da84e1e28746c104b79
+//owner: https://api.github.com/users/trikitrok
+
+class MessageRouter {
+    public void Route(Message message) {
+        //!! ouch... x(
+        ExternalRouter.getInstance().sendMessage(message);
+    }
+}
+
+class ExternalRouter // another Singleton! x(
+{
+    private static ExternalRouter instance;
+
+    private ExternalRouter() {
+        // initialize stuff
+    }
+
+    public static ExternalRouter getInstance() {
+        if (instance == null) {
+            instance = new ExternalRouter();
+        }
+        return instance;
+    }
+
+    // more code...
+    public void sendMessage(Message message) {
+        // interesting code to send the message
+    }
+}

seeker/snippet/IntroduceStaticSetter1.java

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+//date: 2024-09-05T17:06:13Z
+//url: https://api.github.com/gists/6c259d3e1c1c3d3c0e02c580cbbdf1c5
+//owner: https://api.github.com/users/trikitrok
+
+class MessageRouter {
+    public void Route(Message message) {
+        //!! ouch... x(
+        ExternalRouter.getInstance().sendMessage(message);
+    }
+}
+
+class ExternalRouter // another Singleton! x(
+{
+    private static ExternalRouter instance;
+
+    private ExternalRouter() {
+        // initialize stuff
+    }
+
+    public static ExternalRouter getInstance() {
+        if (instance == null) {
+            instance = new ExternalRouter();
+        }
+        return instance;
+    }
+
+    //!! Added for testing purposes only, do not use this in production code
+    public static void setInstanceForTesting(ExternalRouter anInstance) {
+        instance = anInstance;
+    }
+
+    // more code...
+    public void sendMessage(Message message) {
+        // interesting code to send the message
+    }
+}
+
+/////////////////////////////////////////////
+// In some test we use the static setter to 
+// set a test double so that we can control 
+// what the singleton's instance does
+
+class MessageRouterTest
+{
+    @Test
+    public void routes_message()
+    {
+        ExternalRouter externalRouter = mock(ExternalRouter.class);
+        ExternalRouter.setInstanceForTesting(externalRouter);
+        MessageRouter messageRouter = new MessageRouter();
+        Message message = new Message();
+
+        messageRouter.Route(message);
+
+        verify(externalRouter).sendMessage(message);
+    }
+
+    // some other tests...
+
+   @AfterEach
+    public void TearDown()
+    {
+        // to keep tests isolated
+        ExternalRouter.setInstanceForTesting(null);
+    }
+}

seeker/snippet/ReplaceGlobalReferenceWithGetter2.java

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+//date: 2024-09-05T16:46:15Z
+//url: https://api.github.com/gists/278e3df2a2f14aff40d3162dd3cef94c
+//owner: https://api.github.com/users/trikitrok
+
+// After applying Subclass & Override Method
+
+class RegisterSale {
+    private List<Item> items;
+    // more code...
+
+    public void addItem(Barcode code) {
+        // using the Singleton!! x(
+        Item newItem = getInventory().getItemForBarCode(code);
+        items.add(newItem);
+    }
+
+    protected Inventory getInventory() {
+        return Inventory.GetInstance();
+    }
+
+    // more code...
+}
+
+/////////////////////////////
+
+// In some test
+
+public class RegisterSaleTest {
+
+    @Test
+    public void Adds_An_Item() {
+        Barcode code = new Barcode();
+        // some more setup code
+        //...
+        // we subclass & override the getter and return a test double of Inventory
+        Inventory inventory = mock(Inventory.class);
+
+        when(inventory.getItemForBarCode(code)).thenReturn(AnItem().withBarcode(code).build());
+        RegisterSaleForTesting registerSale = new RegisterSaleForTesting(inventory);
+
+        // rest of the test...
+    }
+
+    public class RegisterSaleForTesting extends RegisterSale {
+        private final Inventory inventory;
+
+        public RegisterSaleForTesting(Inventory inventory) {
+            this.inventory = inventory;
+        }
+
+        // overriden to separate from the singleton
+        @Override
+        protected Inventory getInventory() {
+            return inventory;
+        }
+    }
+}