Data commit

Task/Singleton/Groovy/singleton-1.groovy

@@ -0,0 +1,11 @@
+@Singleton
+class SingletonClass {
+
+    def invokeMe() {
+        println 'invoking method of a singleton class'
+    }
+
+    static void main(def args) {
+        SingletonClass.instance.invokeMe()
+    }
+}

Task/Singleton/Groovy/singleton-2.groovy

@@ -0,0 +1,13 @@
+class Singleton
+   method print()
+       write("Hi there.")
+   end
+   initially
+       write("In constructor!")
+       Singleton := create |self
+end
+
+procedure main()
+   Singleton().print()
+   Singleton().print()
+end