Add README.md

dirty-flag/README.md

@@ -0,0 +1,26 @@
+---
+layout: pattern
+title: Dirty Flag
+folder: dirty-flag
+permalink: /patterns/dirty-flag/
+categories: Other
+tags:
+ - Java
+ - Difficulty-Easy
+ - Performance
+---
+
+## Intent
+To avoid expensive re-acquisition of resources. The resources retain their identity, are kept in some
+fast-access storage, and are re-used to avoid having to acquire them again.
+
+![alt text](./etc/dirty-flag.png "Dirty Flag")
+
+## Applicability
+Use the Dirty Flag pattern when
+
+* Repetitious acquisition, initialization, and release of the same resource causes unnecessary performance overhead.
+
+## Credits
+
+* [Design Patterns: Dirty Flag](https://www.takeupcode.com/podcast/89-design-patterns-dirty-flag/)

dirty-flag/pom.xml

@@ -16,10 +16,14 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   </properties>
   <dependencies>
+	<dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <version>3.8.1</version>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
       <scope>test</scope>
     </dependency>
   </dependencies>

dirty-flag/src/test/java/org/dirty/flag/AppTest.java

@@ -24,7 +24,7 @@ package org.dirty.flag;
 
 import java.io.IOException;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 import com.iluwatar.dirtyflag.App;
 

dirty-flag/src/test/java/org/dirty/flag/DirtyFlagTest.java

@@ -22,13 +22,13 @@
  */
 package org.dirty.flag;
 
-import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.lang.reflect.Field;
 import java.util.List;
 
-import org.junit.Before;
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 
 import com.iluwatar.dirtyflag.DataFetcher;
 
@@ -39,7 +39,7 @@ import com.iluwatar.dirtyflag.DataFetcher;
  */
 public class DirtyFlagTest {
 
-  @Before
+  @BeforeEach
   public void reset() throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
     Field instance = DataFetcher.class.getDeclaredField("df");
     instance.setAccessible(true);