Updated examples to the latest version

For release, used in the report/presentation

demo1/.gitignore

@@ -26,3 +26,5 @@ buildNumber.properties
 .factorypath
 .project
 .vscode/
+
+*.jar

demo1/pom.xml

@@ -19,8 +19,8 @@
     <!-- JaCoCo thresholds. Increase gradually as you add tests. -->
     <jacoco.unit-tests.limit.instruction-ratio>0%</jacoco.unit-tests.limit.instruction-ratio>
     <jacoco.unit-tests.limit.branch-ratio>0%</jacoco.unit-tests.limit.branch-ratio>
-    <jacoco.unit-tests.limit.class-complexity>20</jacoco.unit-tests.limit.class-complexity>
+    <jacoco.unit-tests.limit.class-complexity>2100</jacoco.unit-tests.limit.class-complexity>
-    <jacoco.unit-tests.limit.method-complexity>5</jacoco.unit-tests.limit.method-complexity>
+    <jacoco.unit-tests.limit.method-complexity>1000</jacoco.unit-tests.limit.method-complexity>
   </properties>
   <dependencies>
     <dependency>
@@ -38,12 +38,12 @@
     <dependency>
       <groupId>nz.ac.massey.javaecs</groupId>
       <artifactId>javaecs</artifactId>
-      <version>0.9.2-PRERELEASE</version>
+      <version>1.0.1</version>
   </dependency>
   </dependencies>
   <build>
     <plugins>
-      <plugin>
+      <!-- <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-enforcer-plugin</artifactId>
         <version>${maven-enforcer-plugin.version}</version>
@@ -93,8 +93,8 @@
             </goals>
           </execution>
         </executions>
-      </plugin>
+      </plugin> -->
-      <plugin>
+      <!--<plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
         <version>${maven-surefire-plugin.version}</version>
@@ -165,7 +165,7 @@
             </configuration>
           </execution>
         </executions>
-      </plugin>
+      </plugin> -->
     </plugins>
   </build>
   <reporting>
@@ -179,7 +179,7 @@
   </reporting>
   <profiles>
     <!-- Publish coverage report to Coveralls, only when running in Travis. -->
-    <profile>
+    <!-- <profile>
       <id>travis</id>
       <activation>
         <property>
@@ -195,6 +195,6 @@
           </plugin>
         </plugins>
       </build>
-    </profile>
+    </profile> -->
   </profiles>
 </project>

demo1/src/main/java/nz/ac/massey/javaecs/examples/App.java

@@ -1,6 +1,7 @@
 package nz.ac.massey.javaecs.examples;
 
 import java.util.Random;
+import java.util.concurrent.Semaphore;
 
 import javafx.scene.paint.Color;
 import nz.ac.massey.javaecs.*;
@@ -14,6 +15,8 @@ public final class App {
     private App() {
     }
 
+    public static Semaphore rendererReadySemaphore = new Semaphore(0);
+
     /**
      * Simple physics simulation.
      * @param args The arguments of the program.
@@ -52,7 +55,7 @@ public final class App {
         LogUpdateSystem logUpdateSystem = new LogUpdateSystem(gameEngine);
         gameEngine.registerSystem(LogUpdateSystem.class, logUpdateSystem);
 
-        RenderSystem renderSystem = new RenderSystem(gameEngine, 10.);
+        RenderSystem renderSystem = new RenderSystem(gameEngine, 5.);
         gameEngine.registerSystem(RenderSystem.class, renderSystem);
 
         ExistenceSystem existenceSystem =  new ExistenceSystem(gameEngine);
@@ -70,28 +73,28 @@ public final class App {
         // Bottom boundary
         Entity newEnt = gameEngine.createEntity();
         gameEngine.addComponent(newEnt, Vec2D.class, new Vec2D(-50., -50.,0));
-        gameEngine.addComponent(newEnt, RidgidBody.class, new RidgidBody(0., 0., 0., 0., 0.f, 0., -1.));
+        gameEngine.addComponent(newEnt, RidgidBody.class, new RidgidBody(0., 0., 0., 0., 0.f, 0.25, -1.));
         gameEngine.addComponent(newEnt, Collider.class, new Collider(200., 50.)); // 200 along, 50 up
         gameEngine.addComponent(newEnt, Render.class, new Render(BoxRender.class));
         gameEngine.addComponent(newEnt, BoxRender.class, new BoxRender(200, 50, 64, 64, 64));
         // Left boundary
         newEnt = gameEngine.createEntity();
         gameEngine.addComponent(newEnt, Vec2D.class, new Vec2D(-50., -50.,0));
-        gameEngine.addComponent(newEnt, RidgidBody.class, new RidgidBody(0., 0., 0., 0., 0.f, 0., -1.));
+        gameEngine.addComponent(newEnt, RidgidBody.class, new RidgidBody(0., 0., 0., 0., 0.f, 0.25, -1.));
         gameEngine.addComponent(newEnt, Collider.class, new Collider(50., 200.));
         gameEngine.addComponent(newEnt, Render.class, new Render(BoxRender.class));
         gameEngine.addComponent(newEnt, BoxRender.class, new BoxRender(50, 200, 64, 64, 64));
         // Top boundary
         newEnt = gameEngine.createEntity();
         gameEngine.addComponent(newEnt, Vec2D.class, new Vec2D(-50., 100.,0));
-        gameEngine.addComponent(newEnt, RidgidBody.class, new RidgidBody(0., 0., 0., 0., 0.f, 0., -1.));
+        gameEngine.addComponent(newEnt, RidgidBody.class, new RidgidBody(0., 0., 0., 0., 0.f, 0.25, -1.));
         gameEngine.addComponent(newEnt, Collider.class, new Collider(200., 50.));
         gameEngine.addComponent(newEnt, Render.class, new Render(BoxRender.class));
         gameEngine.addComponent(newEnt, BoxRender.class, new BoxRender(200, 50, 64, 64, 64));
         // Right boundary
         newEnt = gameEngine.createEntity();
         gameEngine.addComponent(newEnt, Vec2D.class, new Vec2D(100., -50.,0));
-        gameEngine.addComponent(newEnt, RidgidBody.class, new RidgidBody(0., 0., 0., 0., 0.f, 0., -1.));
+        gameEngine.addComponent(newEnt, RidgidBody.class, new RidgidBody(0., 0., 0., 0., 0.f, 0.25, -1.));
         gameEngine.addComponent(newEnt, Collider.class, new Collider(50., 200.));
         gameEngine.addComponent(newEnt, Render.class, new Render(BoxRender.class));
         gameEngine.addComponent(newEnt, BoxRender.class, new BoxRender(50, 200, 64, 64, 64));
@@ -110,7 +113,7 @@ public final class App {
         gameEngine.addComponent(newEnt, Reporter.class, new Reporter());
         gameEngine.addComponent(newEnt, Vec2D.class, new Vec2D(5,5,0));
         
-        /* // Uncomment this block to enable the stress-test (runs 500 square entities, with physics etc.)
+         // Uncomment this block to enable the stress-test (runs 500 square entities, with physics etc.)
         Random rand = new Random();
         for (int i = 0; i < 500; i++) {
             newEnt = gameEngine.createEntity();
@@ -122,15 +125,16 @@ public final class App {
             gameEngine.addComponent(newEnt, Render.class, new Render(BoxRender.class));
             gameEngine.addComponent(newEnt, BoxRender.class, new BoxRender(size, size, 30 + rand.nextInt(225), 30 + rand.nextInt(225), 30 + rand.nextInt(225)));
             gameEngine.addComponent(newEnt, TimedExistence.class, new TimedExistence(25 + rand.nextDouble() * 90));
-        } */
+        }
 
         /************************************
         **    Run init() on the systems    **
         *************************************/
+        renderSystem.init();
+        rendererReadySemaphore.acquire();
         physicsSystem.init();
         collisionSystem.init();
         logUpdateSystem.init();
-        renderSystem.init();
         existenceSystem.init();
         reportSystem.init();
 
@@ -142,14 +146,15 @@ public final class App {
         double frameRate = 1.0 / 144; // 1 second divided by target number of frames
         
         boolean exit = false;
+        Thread.sleep(5000);
         long startTime = System.nanoTime();
         while (!exit){
             // Run system updates
-            collisionSystem.update();
+            collisionSystem.update(dt);
             physicsSystem.update(dt);
             existenceSystem.update(dt);
-            reportSystem.update();
+            reportSystem.update(dt);
-            renderSystem.update();
+            renderSystem.update(dt);
 
             dt = (System.nanoTime() - startTime) / 1e9; // convert nanoseconds to seconds
             startTime = System.nanoTime();

demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/CollisionSystem.java

@@ -1,14 +1,11 @@
 package nz.ac.massey.javaecs.examples.Systems;
 
 import java.util.BitSet;
-import java.util.HashSet;
-import java.util.Set;
 
 import nz.ac.massey.javaecs.ECSSystem;
 import nz.ac.massey.javaecs.Engine;
 import nz.ac.massey.javaecs.Entity;
 import nz.ac.massey.javaecs.examples.Components.Collider;
-import nz.ac.massey.javaecs.examples.Components.Gravity;
 import nz.ac.massey.javaecs.examples.Components.RidgidBody;
 import nz.ac.massey.javaecs.examples.Components.Vec2D;
 
@@ -28,41 +25,35 @@ public class CollisionSystem extends ECSSystem {
     public void init() {
     }
 
-    // This is a quick & naive physics implementation. Not all collision states are accurately calculated
+    // This is a quick & naive physics implementation.
-    // I also expect it is highly inefficient, though I was able to run it with 500 subscribed entities
+    // I expect it is highly inefficient, though it is able to run it with 500
+    // subscribed entities
     // with no major performance issues
-    // Replace this with a proper system as required
+    // Replace this with a proper system as required - I.e. Box2D or etc.
     @Override
-    public void update() {
+    public void update(double dt) {
-        Set<Entity> processed = new HashSet<>();
-        // Gets all items we have collided with
         for (Entity entity : entities) {
             Vec2D pos = (Vec2D) gameEngine.getComponentData(entity, Vec2D.class);
             RidgidBody ridgidBody = (RidgidBody) gameEngine.getComponentData(entity, RidgidBody.class);
             Collider collider = (Collider) gameEngine.getComponentData(entity, Collider.class);
             if (ridgidBody.mass >= 0) {
                 // Only ignore non-static colliders
-                //processed.add(entity);
                 for (Entity entity2 : entities) {
-                    if (!processed.contains(entity2)) {
                     // skip entities that have already been processed
                     Vec2D otherPos = (Vec2D) gameEngine.getComponentData(entity2, Vec2D.class);
-                        RidgidBody otherRidgidBody = (RidgidBody) gameEngine.getComponentData(entity2,
+                    RidgidBody otherRidgidBody = (RidgidBody) gameEngine.getComponentData(entity2, RidgidBody.class);
-                                RidgidBody.class);
                     Collider otherCollider = (Collider) gameEngine.getComponentData(entity2, Collider.class);
 
-                        if (ridgidBody.mass >= 0 || otherRidgidBody.mass >= 0) {
+                    if (otherRidgidBody.mass < 0) {
                         // Evaluate a collision in the top-left
                         boolean tlCollide = pos.x > otherPos.x && pos.x < otherPos.x + otherCollider.x
                                 && pos.y > otherPos.y && pos.y < otherPos.y + otherCollider.y;
                         // Evaluate a collision in the bottom-left
                         boolean blCollide = pos.x > otherPos.x && pos.x < otherPos.x + otherCollider.x
-                                    && pos.y + collider.y > otherPos.y
+                                && pos.y + collider.y > otherPos.y && pos.y + collider.y < otherPos.y + otherCollider.y;
-                                    && pos.y + collider.y < otherPos.y + otherCollider.y;
                         // Evaluate a collision in the bottom-right
                         boolean brCollide = pos.x + collider.x > otherPos.x
-                                    && pos.x + collider.x < otherPos.x + otherCollider.x
+                                && pos.x + collider.x < otherPos.x + otherCollider.x && pos.y + collider.y > otherPos.y
-                                    && pos.y + collider.y > otherPos.y
                                 && pos.y + collider.y < otherPos.y + otherCollider.y;
                         // Evaluate a collision in the top-right
                         boolean trCollide = pos.x + collider.x > otherPos.x
@@ -74,8 +65,7 @@ public class CollisionSystem extends ECSSystem {
                             double totalYVel = Math.abs(ridgidBody.yVel) + Math.abs(otherRidgidBody.yVel);
                             double xMult = 0;
                             double yMult = 0;
-                                double multTot = (1 + ridgidBody.bounciness);
+                            double multTot = 1;
-                                double totalMass = ridgidBody.mass + otherRidgidBody.mass;
                             boolean fullEdge = false;
                             // left-hand collision
                             if (tlCollide && blCollide) {
@@ -90,40 +80,26 @@ public class CollisionSystem extends ECSSystem {
                                 xMult = -multTot;
                             }
                             // Bottom collision
-                                if (blCollide && brCollide) {
+                            else if (blCollide && brCollide) {
                                 fullEdge = true;
-                                    //pos.y = otherPos.y + otherCollider.y;
+                                // pos.y = otherPos.y + otherCollider.y;
                                 pos.y = otherPos.y - collider.y;
                                 yMult = -multTot;
                             }
                             // top collision
                             else if (trCollide && tlCollide) {
                                 fullEdge = true;
-                                    //pos.y = otherPos.y - collider.y;
+                                // pos.y = otherPos.y - collider.y;
                                 pos.y = otherPos.y + otherCollider.y;
                                 yMult = multTot;
                             }
                             if (fullEdge) {
-                                    // Finally, actuate the calculation
+                                    double newXVel = totalXVel * (xMult
-                                    // entity 2 is immovable; full acceleration applied to the current entity
+                                            * (Math.abs(xMult) + (ridgidBody.bounciness * otherRidgidBody.bounciness)));
-                                    
+                                    double newYVel = totalYVel * (yMult
-                                    if (otherRidgidBody.mass > 0){
+                                            * (Math.abs(yMult) + (ridgidBody.bounciness * otherRidgidBody.bounciness)));
-                                        ridgidBody.xVel += totalXVel * xMult * ((totalMass - ridgidBody.mass) / totalMass);
+                                    ridgidBody.xVel += newXVel;
-                                        ridgidBody.yVel += totalYVel * yMult * ((totalMass - ridgidBody.mass) / totalMass);
+                                    ridgidBody.yVel += newYVel;
-
-                                        otherRidgidBody.xVel -= totalXVel * xMult * ((totalMass - otherRidgidBody.mass) / totalMass);
-                                        otherRidgidBody.yVel -= totalYVel * yMult * ((totalMass - otherRidgidBody.mass) / totalMass);
-                                    }
-                                    else{
-                                        ridgidBody.xVel += totalXVel * xMult;
-                                        ridgidBody.yVel += totalYVel * yMult;
-                                    }
-                                    Object grav = gameEngine.getComponentData(entity, Gravity.class);
-                                    if (grav != null) {
-                                        // negate gravity while collided
-                                        Gravity gravity = (Gravity) grav;
-                                        ridgidBody.xAcc += gravity.x * -1.;
-                                        ridgidBody.yAcc += gravity.y * -1.;
                             }
                         }
                     }
@@ -131,30 +107,4 @@ public class CollisionSystem extends ECSSystem {
             }
         }
     }
-
-        }
-    }
-
-    /**
-     * Zero degrees is straight up, 90 east -90 (270) = west 180 south
-     * 
-     * @param xVel
-     * @param yVel
-     * @return
-     */
-    public static double calcAngle(double xVel, double yVel) {
-        if (xVel == 0) { // Div zero; = +- 90
-            return yVel < 0 ? 270 : 90;
-        } else if (xVel < 0 && yVel < 0) { // bottom-left quad (180 - 270)
-            return 180. + Math.tanh(yVel / xVel);
-        } else if (xVel < 0) { // Top left quad (270 - 360)
-            return 360 - Math.tanh(yVel / xVel);
-        } else if (yVel < 0) {
-            return 180 - Math.tanh(yVel / xVel);
-        } else {
-            return Math.tanh(yVel / xVel);
-        }
-
-    }
-
 }

demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/ExistenceSystem.java

@@ -34,9 +34,6 @@ public class ExistenceSystem extends ECSSystem{
     }
 
     @Override
-    public void update() {        
-    }
-
     public void update(double dt){
         Queue<Entity> deletions = new LinkedList<>();
         for (Entity entity : entities) {

demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/LogUpdateSystem.java

@@ -24,7 +24,7 @@ public class LogUpdateSystem extends ECSSystem{
     }
 
     @Override
-    public void update() {
+    public void update(double dt) {
         for (Entity entity : entities) {
             Vec2D pos = (Vec2D)gameEngine.getComponentData(entity, Vec2D.class);
             System.out.println(String.format("X: %.6g, Y: %.6g", pos.x, pos.y));

demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/PhysicsSystem.java

@@ -30,11 +30,6 @@ public class PhysicsSystem extends ECSSystem {
     }
 
     @Override
-    public void update() {
-        // TODO Auto-generated method stub
-        
-    }
-
     public void update(double dt){
         for (Entity entity : entities) {
             Vec2D pos = (Vec2D)gameEngine.getComponentData(entity, Vec2D.class);

demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/RenderSystem.java

@@ -14,6 +14,7 @@ import javafx.stage.Stage;
 import nz.ac.massey.javaecs.ECSSystem;
 import nz.ac.massey.javaecs.Engine;
 import nz.ac.massey.javaecs.Entity;
+import nz.ac.massey.javaecs.examples.App;
 import nz.ac.massey.javaecs.examples.Components.BoxRender;
 import nz.ac.massey.javaecs.examples.Components.Render;
 import nz.ac.massey.javaecs.examples.Components.TextRender;
@@ -24,8 +25,8 @@ public class RenderSystem extends ECSSystem{
     Engine gameEngine;
     Thread renderThread;
     double renderScale;
-    int screenX = 1024;
+    int screenX = 512;
-    int screenY = 1024;
+    int screenY = 512;
 
     public RenderSystem(Engine gameEngine, double renderScale){
         this.gameEngine = gameEngine;
@@ -44,7 +45,8 @@ public class RenderSystem extends ECSSystem{
     }
 
     @Override
-    public void update() {
+    public void update(double dt) {
+        // This approach needs reconsidering, as it creates an excessive amount of objects that 
         Group renderScene = new Group();
         for (Entity entity : entities) {
             if (((Render)gameEngine.getComponentData(entity, Render.class)).renderType == BoxRender.class){
@@ -53,8 +55,8 @@ public class RenderSystem extends ECSSystem{
 
                 Rectangle rect = new Rectangle(box.xSize* renderScale, box.ySize * renderScale);
                 rect.setFill(new Color(box.r, box.g, box.b, box.a));
-                rect.setX(12 + (vec2d.x * renderScale));
+                rect.setX(6 + (vec2d.x * renderScale));
-                rect.setY(1012 - (vec2d.y * renderScale) - rect.getHeight());
+                rect.setY(506 - (vec2d.y * renderScale) - rect.getHeight());
                 renderScene.getChildren().add(rect);
             }
             else if (((Render)gameEngine.getComponentData(entity, Render.class)).renderType == TextRender.class){
@@ -99,9 +101,11 @@ public class RenderSystem extends ECSSystem{
         public void start(Stage primaryStage) throws Exception {
             // based on the colorful circles sample at https://docs.oracle.com/javase/8/javafx/get-started-tutorial/animation.htm 
             root = new Group();
-            Scene scene = new Scene(root, 1024, 1024, Color.BLACK);
+            Scene scene = new Scene(root, 512, 512, Color.BLACK);
             primaryStage.setScene(scene);
             primaryStage.show();
+            // Signal the renderer is ready
+            App.rendererReadySemaphore.release();
         }
         
         public static void run(){

demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/ReportSystem.java

@@ -23,7 +23,7 @@ public class ReportSystem extends ECSSystem{
     }
 
     @Override
-    public void update() {
+    public void update(double dt) {
         for (Entity entity : entities) {
             TextRender text = (TextRender)gameEngine.getComponentData(entity, TextRender.class);
             text.content = "Num Entities: " + gameEngine.getNumEntities();

demo2/.editorconfig

@@ -0,0 +1,17 @@
+# Editor configuration, see http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 80
+
+[*.sh]
+end_of_line = lf
+
+[*.java]
+indent_size = 4
+max_line_length = 120

demo2/.gitattributes

@@ -0,0 +1,2 @@
+# When shell scripts end in CRLF, bash gives a cryptic error message
+*.sh text eol=lf

demo2/.gitignore

@@ -0,0 +1,28 @@
+#
+# Standard Maven .gitignore
+#
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+
+#
+# IntelliJ
+#
+*.iml
+.idea/*
+!.idea/runConfigurations/
+
+#
+# Visual Studio Code
+#
+.settings/
+.classpath
+.factorypath
+.project
+.vscode/

demo2/.travis.yml

@@ -0,0 +1,4 @@
+language: java
+jdk: openjdk8
+after_success:
+  - mvn coveralls:report

demo2/pom.xml

@@ -0,0 +1,200 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>nz.ac.massey.javaecs.examples</groupId>
+  <artifactId>demo2</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <properties>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <junit.version>5.6.0</junit.version>
+    <maven-enforcer-plugin.version>3.0.0-M3</maven-enforcer-plugin.version>
+    <maven-checkstyle-plugin.version>3.1.0</maven-checkstyle-plugin.version>
+    <checkstyle.version>8.29</checkstyle.version>
+    <checkstyle-rules.version>4.0.1</checkstyle-rules.version>
+    <maven-surefire-plugin.version>3.0.0-M4</maven-surefire-plugin.version>
+    <jacoco-maven-plugin.version>0.8.4</jacoco-maven-plugin.version>
+    <maven-javadoc-plugin.version>3.0.0</maven-javadoc-plugin.version>
+    <coveralls-maven-plugin.version>4.3.0</coveralls-maven-plugin.version>
+    <!-- JaCoCo thresholds. Increase gradually as you add tests. -->
+    <jacoco.unit-tests.limit.instruction-ratio>0%</jacoco.unit-tests.limit.instruction-ratio>
+    <jacoco.unit-tests.limit.branch-ratio>0%</jacoco.unit-tests.limit.branch-ratio>
+    <jacoco.unit-tests.limit.class-complexity>20</jacoco.unit-tests.limit.class-complexity>
+    <jacoco.unit-tests.limit.method-complexity>5</jacoco.unit-tests.limit.method-complexity>
+  </properties>
+  <dependencies>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <version>${junit.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <version>${junit.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>nz.ac.massey.javaecs</groupId>
+      <artifactId>javaecs</artifactId>
+      <version>1.0.1</version>
+  </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>${maven-enforcer-plugin.version}</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <requireMavenVersion>
+                  <version>3.6.3</version>
+                </requireMavenVersion>
+              </rules>
+              <fail>true</fail>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <version>${maven-checkstyle-plugin.version}</version>
+        <dependencies>
+          <dependency>
+            <groupId>com.puppycrawl.tools</groupId>
+            <artifactId>checkstyle</artifactId>
+            <version>${checkstyle.version}</version>
+          </dependency>
+          <dependency>
+            <groupId>com.github.ngeor</groupId>
+            <artifactId>checkstyle-rules</artifactId>
+            <version>${checkstyle-rules.version}</version>
+          </dependency>
+        </dependencies>
+        <configuration>
+          <configLocation>com/github/ngeor/checkstyle.xml</configLocation>
+          <includeTestSourceDirectory>true</includeTestSourceDirectory>
+          <skip>${skipTests}</skip>
+        </configuration>
+        <executions>
+          <execution>
+            <id>checkstyle</id>
+            <phase>validate</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>${maven-surefire-plugin.version}</version>
+      </plugin>
+      <plugin>
+        <groupId>org.jacoco</groupId>
+        <artifactId>jacoco-maven-plugin</artifactId>
+        <version>${jacoco-maven-plugin.version}</version>
+        <executions>
+          <execution>
+            <id>pre-unit-test</id>
+            <goals>
+              <goal>prepare-agent</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>post-unit-test</id>
+            <phase>test</phase>
+            <goals>
+              <goal>report</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>check-unit-test</id>
+            <phase>test</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+            <configuration>
+              <dataFile>${project.build.directory}/jacoco.exec</dataFile>
+              <rules>
+                <rule>
+                  <element>BUNDLE</element>
+                  <limits>
+                    <limit>
+                      <counter>INSTRUCTION</counter>
+                      <value>COVEREDRATIO</value>
+                      <minimum>${jacoco.unit-tests.limit.instruction-ratio}</minimum>
+                    </limit>
+                    <limit>
+                      <counter>BRANCH</counter>
+                      <value>COVEREDRATIO</value>
+                      <minimum>${jacoco.unit-tests.limit.branch-ratio}</minimum>
+                    </limit>
+                  </limits>
+                </rule>
+                <rule>
+                  <element>CLASS</element>
+                  <limits>
+                    <limit>
+                      <counter>COMPLEXITY</counter>
+                      <value>TOTALCOUNT</value>
+                      <maximum>${jacoco.unit-tests.limit.class-complexity}</maximum>
+                    </limit>
+                  </limits>
+                </rule>
+                <rule>
+                  <element>METHOD</element>
+                  <limits>
+                    <limit>
+                      <counter>COMPLEXITY</counter>
+                      <value>TOTALCOUNT</value>
+                      <maximum>${jacoco.unit-tests.limit.method-complexity}</maximum>
+                    </limit>
+                  </limits>
+                </rule>
+              </rules>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+  <reporting>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-javadoc-plugin</artifactId>
+        <version>${maven-javadoc-plugin.version}</version>
+      </plugin>
+    </plugins>
+  </reporting>
+  <profiles>
+    <!-- Publish coverage report to Coveralls, only when running in Travis. -->
+    <profile>
+      <id>travis</id>
+      <activation>
+        <property>
+          <name>env.TRAVIS</name>
+        </property>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.eluder.coveralls</groupId>
+            <artifactId>coveralls-maven-plugin</artifactId>
+            <version>${coveralls-maven-plugin.version}</version>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+</project>

demo2/src/main/java/nz/ac/massey/javaecs/examples/App.java

@@ -0,0 +1,120 @@
+package nz.ac.massey.javaecs.examples;
+
+import java.io.FileInputStream;
+import java.util.concurrent.Semaphore;
+
+import javafx.scene.Group;
+import javafx.scene.image.Image;
+import javafx.stage.Stage;
+import nz.ac.massey.javaecs.Engine;
+import nz.ac.massey.javaecs.Entity;
+import nz.ac.massey.javaecs.examples.Components.Control;
+import nz.ac.massey.javaecs.examples.Components.Input;
+import nz.ac.massey.javaecs.examples.Components.Render;
+import nz.ac.massey.javaecs.examples.Components.Sprite;
+import nz.ac.massey.javaecs.examples.Components.Vec2D;
+import nz.ac.massey.javaecs.examples.Systems.ControlSystem;
+import nz.ac.massey.javaecs.examples.Systems.PlayerSystem;
+import nz.ac.massey.javaecs.examples.Systems.RenderSystem;
+
+/**
+ * Hello world!
+ */
+public class App {
+    static App thisApp;
+    public App() {
+        thisApp = this;
+    }
+    static Engine gameEngine;
+    public static Stage worldStage;
+    public static Group worldGroup;
+    static Integer syncManager = 0;
+    static Semaphore rendererFinished = new Semaphore(0);
+    /**
+     * Says hello to the world.
+     * @param args The arguments of the program.
+     */
+    public static void main(String[] args) throws Exception{
+        /************************************
+        **        Initialise engine        **
+        *************************************/
+        gameEngine = new Engine(16384);
+
+        /************************************
+        **    Register game components     **
+        *************************************/
+        gameEngine.registerComponent(Control.class);
+        gameEngine.registerComponent(Render.class);
+        gameEngine.registerComponent(Sprite.class);
+        gameEngine.registerComponent(Vec2D.class);
+        gameEngine.registerComponent(Input.class);
+
+
+        /************************************
+        ** Register and initialise systems **
+        *************************************/
+        ControlSystem controlSystem = new ControlSystem(gameEngine);
+        gameEngine.registerSystem(ControlSystem.class, controlSystem);
+
+        RenderSystem renderSystem = new RenderSystem(gameEngine, 5.);
+        gameEngine.registerSystem(RenderSystem.class, renderSystem);
+
+        PlayerSystem playerSystem = new PlayerSystem(gameEngine);
+        gameEngine.registerSystem(PlayerSystem.class, playerSystem);
+
+
+
+        /************************************
+        **       Create known entities     **
+        *************************************/
+        // Input controller - gets player input
+        Entity inputEntity = gameEngine.createEntity();
+        gameEngine.addComponent(inputEntity, Input.class, new Input());
+
+        Entity playerEntity = gameEngine.createEntity();
+        gameEngine.addComponent(playerEntity, Vec2D.class, new Vec2D(25,25));
+        gameEngine.addComponent(playerEntity, Render.class, new Render(Sprite.class));
+        gameEngine.addComponent(playerEntity, Control.class, new Render(Control.class));
+        // Load the sprite
+        System.err.println(System.getProperty("user.dir"));
+        Image image = new Image(new FileInputStream("sprite.png"));
+        gameEngine.addComponent(playerEntity, Sprite.class, new Sprite(image, 50, 50));
+        // Push rendering into its own thread (to meet the design principle of a JavaFX program)
+        Thread renderThread = new Thread(new RenderStarter());
+        renderThread.start();
+
+        
+        // Use a semaphore to block until the renderer is set-up
+        rendererFinished.acquire();
+        
+        /************************************
+        **    Run init() on the systems    **
+        *************************************/
+
+        controlSystem.init(worldStage);
+        playerSystem.init(inputEntity);
+        renderSystem.init(worldGroup);
+
+        double dt = 0.001;
+        double frameRate = 1.0 / 144; // 1 second divided by target number of frames
+        
+        boolean exit = false;
+        long startTime = System.nanoTime();
+
+        while (!exit){
+            // Run system updates
+            controlSystem.update(dt);
+            playerSystem.update(dt);
+            renderSystem.update(dt);
+
+            dt = (System.nanoTime() - startTime) / 1e9; // convert nanoseconds to seconds
+            startTime = System.nanoTime();
+            if (dt < frameRate){
+                Thread.sleep((int)((frameRate-dt)*1000));
+                dt = (System.nanoTime() - startTime) / 1e9;
+                startTime = System.nanoTime();
+            }
+        } 
+        renderThread.join(); // Wait for any render task to exit     
+    }
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/Components/Control.java

@@ -0,0 +1,5 @@
+package nz.ac.massey.javaecs.examples.Components;
+
+public class Control {
+    public int input = -1;
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/Components/Input.java

@@ -0,0 +1,9 @@
+package nz.ac.massey.javaecs.examples.Components;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class Input {
+    // As this is a user-input- (i.e. timeframe in 10's or 100's of milliseconds) -derived value, the performance impact of
+    // AtomicInteger is irrelevant compared to its synchronisation ability.
+    public AtomicInteger input = new AtomicInteger(-1);
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/Components/Render.java

@@ -0,0 +1,11 @@
+package nz.ac.massey.javaecs.examples.Components;
+
+import java.lang.reflect.Type;
+
+public class Render {
+    public Type renderType;
+
+    public Render(Type t){
+        renderType = t;
+    }
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/Components/Sprite.java

@@ -0,0 +1,15 @@
+package nz.ac.massey.javaecs.examples.Components;
+
+import javafx.scene.image.Image;
+
+public class Sprite {
+    public Image sprite;
+    public Integer height;
+    public Integer width;
+
+    public Sprite(Image sprite, int height, int width){
+        this.sprite = sprite;
+        this.width = width;
+        this.height = height;
+    }
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/Components/Vec2D.java

@@ -0,0 +1,11 @@
+package nz.ac.massey.javaecs.examples.Components;
+
+public class Vec2D {
+    public double x;
+    public double y;
+
+    public Vec2D(double x, double y){
+        this.x = x;
+        this.y = y;
+    }
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/JFXView.java

@@ -0,0 +1,28 @@
+package nz.ac.massey.javaecs.examples;
+
+
+import javafx.application.Application;
+import javafx.scene.Group;
+import javafx.scene.Scene;
+import javafx.scene.paint.Color;
+import javafx.stage.Stage;
+
+public class JFXView extends Application {
+    public static Group root;
+
+    @Override
+    public void start(Stage primaryStage) throws Exception {
+        primaryStage.setTitle("JavaECS Demo 2");
+        App.worldGroup = new Group();
+        App.worldStage = primaryStage;
+        Scene scene = new Scene(App.worldGroup, 512, 512, Color.BLACK);
+        primaryStage.setScene(scene);
+        primaryStage.show();
+        // Notifiy that the renderer is ready
+        App.rendererFinished.release();
+    }
+    
+    public static void run(){
+        launch(new String[0]);
+    }
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/RenderStarter.java

@@ -0,0 +1,16 @@
+package nz.ac.massey.javaecs.examples;
+
+import javafx.scene.Group;
+
+// Add a renderer
+public class RenderStarter implements Runnable{
+
+    @Override
+    public void run() {
+        JFXView.run();
+    }
+    void updateScene(Group newGroup){
+        JFXView.root.getChildren().clear();
+        JFXView.root.getChildren().add(newGroup); 
+    }
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/Systems/ControlSystem.java

@@ -0,0 +1,81 @@
+package nz.ac.massey.javaecs.examples.Systems;
+
+import java.util.BitSet;
+
+import javafx.application.Platform;
+import javafx.scene.input.KeyCode;
+import javafx.scene.input.KeyEvent;
+import javafx.stage.Stage;
+import nz.ac.massey.javaecs.ECSSystem;
+import nz.ac.massey.javaecs.Engine;
+import nz.ac.massey.javaecs.Entity;
+import nz.ac.massey.javaecs.examples.Components.Input;
+
+
+/**
+ * The control system creates a handler for input in the world stage.
+ * It then passes input events as they occur to the Input component
+ * The ControlSystem reads this input every frame update and enacts
+ * on the player controller
+ */
+public class ControlSystem extends ECSSystem {
+    Engine gameEngine;
+    Entity inputEntity;
+
+    public ControlSystem(Engine gamEngine){
+        this.gameEngine = gamEngine;
+        registrationSet = new BitSet();
+        registrationSet.set(gameEngine.getComponentIndex(Input.class));
+    }
+
+    public void init(Stage world) {
+        // use a single entity to control inputs, it is present in the world stage
+        // and is responsible for collecting & passing data
+        inputEntity = entities.iterator().next();
+
+        // Add an event handler to the stage. This
+        Platform.runLater(new Runnable(){
+            @Override
+            public void run() {
+                world.addEventHandler(KeyEvent.KEY_PRESSED, (key) -> {
+                    if(key.getCode()==KeyCode.W) {
+                        updateKeyPress(0);
+                        System.err.println("W pressed");
+                    }
+                    else if(key.getCode()==KeyCode.S) {
+                        updateKeyPress(1);
+                        System.err.println("S pressed");
+                    }
+                    else if(key.getCode()==KeyCode.A) {
+                        updateKeyPress(2);
+                        System.err.println("A pressed");
+                    }
+                    else if(key.getCode()==KeyCode.D) {
+                        updateKeyPress(3);
+                        System.err.println("D pressed");
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    public void update(double dt) {
+        //Input inputUpdate = (Input)gameEngine.getComponentData(inputEntity, Input.class);
+        // TODO Auto-generated method stub
+        
+    }
+
+    // Updates the input's keypressed state
+    protected void updateKeyPress(int dir){
+        Input inputUpdate = (Input)gameEngine.getComponentData(inputEntity, Input.class);
+        inputUpdate.input.set(dir);
+    }
+
+    @Override
+    public void init() throws Exception {
+        // TODO Auto-generated method stub
+        
+    }
+    
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/Systems/PlayerSystem.java

@@ -0,0 +1,59 @@
+package nz.ac.massey.javaecs.examples.Systems;
+
+import java.util.BitSet;
+
+import nz.ac.massey.javaecs.ECSSystem;
+import nz.ac.massey.javaecs.Engine;
+import nz.ac.massey.javaecs.Entity;
+import nz.ac.massey.javaecs.examples.Components.Control;
+import nz.ac.massey.javaecs.examples.Components.Input;
+import nz.ac.massey.javaecs.examples.Components.Sprite;
+import nz.ac.massey.javaecs.examples.Components.Vec2D;
+
+public class PlayerSystem extends ECSSystem{
+    Engine gameEngine;
+    Entity inputEntity; // Entity which recieves event data
+
+
+    public PlayerSystem(Engine gameEngine){
+        this.gameEngine = gameEngine;
+        registrationSet = new BitSet();
+        registrationSet.set(gameEngine.getComponentIndex(Control.class));
+    }
+
+    public void init(Entity inputEntity){
+        this.inputEntity = inputEntity;
+    }
+
+    @Override
+    public void init() throws Exception {
+        // TODO Auto-generated method stub
+        
+    }
+
+    @Override
+    public void update(double dt) {
+        int state = ((Input)gameEngine.getComponentData(inputEntity, Input.class)).input.get();
+        // The value of the input may change before control leaves here; sychronisation isn't
+        // hugely important through this section. So we can just ignore the change
+        for (Entity entity : entities) {
+            Vec2D pos = (Vec2D)gameEngine.getComponentData(entity, Vec2D.class);
+            Sprite sprite = (Sprite)gameEngine.getComponentData(entity, Sprite.class);
+            if (state == 0){ // W
+                pos.y -= sprite.height/2;
+            }
+            else if (state == 1){ // S
+                pos.y += sprite.height/2;
+            }
+            else if (state == 2){ // A
+                pos.x -= sprite.width/2;
+            }
+            else if (state == 3){ // D
+                pos.x += sprite.width/2;
+            }
+        }
+        // Finally, unset the state 
+        ((Input)gameEngine.getComponentData(inputEntity, Input.class)).input.set(-1); // Unset the state, it has been handled        
+    }
+    
+}

demo2/src/main/java/nz/ac/massey/javaecs/examples/Systems/RenderSystem.java

@@ -0,0 +1,69 @@
+package nz.ac.massey.javaecs.examples.Systems;
+
+import java.util.BitSet;
+
+import javafx.application.Platform;
+import javafx.scene.Group;
+import javafx.scene.image.ImageView;
+import nz.ac.massey.javaecs.ECSSystem;
+import nz.ac.massey.javaecs.Engine;
+import nz.ac.massey.javaecs.Entity;
+import nz.ac.massey.javaecs.examples.Components.Render;
+import nz.ac.massey.javaecs.examples.Components.Sprite;
+import nz.ac.massey.javaecs.examples.Components.Vec2D;
+/*
+ * This render system is different from demo 1, as its main functionality is provided directly by the program, not as an entity.
+*/
+public class RenderSystem extends ECSSystem {
+    Engine gameEngine;
+    Group renderGroup;
+    Thread renderThread;
+    double renderScale;
+    int screenX = 512;
+    int screenY = 512;
+
+    public RenderSystem(Engine gameEngine, double renderScale){
+        this.gameEngine = gameEngine;
+        // Set registrations
+        registrationSet = new BitSet();
+        registrationSet.set(gameEngine.getComponentIndex(Render.class));
+        this.renderScale = renderScale;
+    }
+    public void init(Group renderGroup) throws Exception {
+        this.renderGroup = renderGroup;        
+    }
+
+    @Override
+    public void init() throws Exception {
+        // TODO Auto-generated method stub
+        
+    }
+
+    @Override
+    public void update(double dt) {
+        Group frame = new Group();
+        for (Entity entity : entities) {
+            Vec2D pos = (Vec2D)gameEngine.getComponentData(entity, Vec2D.class);
+            if (((Render)gameEngine.getComponentData(entity, Render.class)).renderType == Sprite.class){
+                // Render the sprite
+                Sprite sprite = (Sprite)gameEngine.getComponentData(entity, Sprite.class);
+                ImageView spriteRender = new ImageView(sprite.sprite);
+                spriteRender.setX(pos.x);
+                spriteRender.setY(pos.y);
+                spriteRender.setFitWidth(sprite.width);
+                spriteRender.setFitHeight(sprite.height);
+                frame.getChildren().add(spriteRender);
+            }
+        }
+        
+        // Must be run by the UI thread, not the main thread.
+        // This dispatches the operation run() to the UI.
+        Platform.runLater(new Runnable(){
+            @Override
+            public void run() {
+                renderGroup.getChildren().clear();
+                renderGroup.getChildren().add(frame);
+            }
+        });
+    }
+}

demo2/src/test/java/nz/ac/massey/javaecs/examples/AppTest.java

@@ -0,0 +1,18 @@
+package nz.ac.massey.javaecs.examples;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Unit test for simple App.
+ */
+class AppTest {
+    /**
+     * Rigorous Test.
+     */
+    @Test
+    void testApp() {
+        assertEquals(1, 1);
+    }
+}

perftest/.editorconfig

@@ -0,0 +1,17 @@
+# Editor configuration, see http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 80
+
+[*.sh]
+end_of_line = lf
+
+[*.java]
+indent_size = 4
+max_line_length = 120

perftest/.gitattributes

@@ -0,0 +1,2 @@
+# When shell scripts end in CRLF, bash gives a cryptic error message
+*.sh text eol=lf

perftest/.gitignore

@@ -0,0 +1,31 @@
+#
+# Standard Maven .gitignore
+#
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+
+#
+# IntelliJ
+#
+*.iml
+.idea/*
+!.idea/runConfigurations/
+
+#
+# Visual Studio Code
+#
+.settings/
+.classpath
+.factorypath
+.project
+.vscode/
+
+# Ignore logs, these came from an error in the VM
+*.log

perftest/.travis.yml

@@ -0,0 +1,4 @@
+language: java
+jdk: openjdk8
+after_success:
+  - mvn coveralls:report

perftest/pom.xml

@@ -0,0 +1,200 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>nz.ac.massey.javaecs.examples</groupId>
+  <artifactId>perftest</artifactId>
+  <version>1.0-SNAPSHOT</version>
+  <properties>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <junit.version>5.6.0</junit.version>
+    <maven-enforcer-plugin.version>3.0.0-M3</maven-enforcer-plugin.version>
+    <maven-checkstyle-plugin.version>3.1.0</maven-checkstyle-plugin.version>
+    <checkstyle.version>8.29</checkstyle.version>
+    <checkstyle-rules.version>4.0.1</checkstyle-rules.version>
+    <maven-surefire-plugin.version>3.0.0-M4</maven-surefire-plugin.version>
+    <jacoco-maven-plugin.version>0.8.4</jacoco-maven-plugin.version>
+    <maven-javadoc-plugin.version>3.0.0</maven-javadoc-plugin.version>
+    <coveralls-maven-plugin.version>4.3.0</coveralls-maven-plugin.version>
+    <!-- JaCoCo thresholds. Increase gradually as you add tests. -->
+    <jacoco.unit-tests.limit.instruction-ratio>0%</jacoco.unit-tests.limit.instruction-ratio>
+    <jacoco.unit-tests.limit.branch-ratio>0%</jacoco.unit-tests.limit.branch-ratio>
+    <jacoco.unit-tests.limit.class-complexity>20</jacoco.unit-tests.limit.class-complexity>
+    <jacoco.unit-tests.limit.method-complexity>5</jacoco.unit-tests.limit.method-complexity>
+  </properties>
+  <dependencies>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <version>${junit.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <version>${junit.version}</version>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>nz.ac.massey.javaecs</groupId>
+      <artifactId>javaecs</artifactId>
+      <version>1.0.1</version>
+  </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-enforcer-plugin</artifactId>
+        <version>${maven-enforcer-plugin.version}</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>enforce</goal>
+            </goals>
+            <configuration>
+              <rules>
+                <requireMavenVersion>
+                  <version>3.6.3</version>
+                </requireMavenVersion>
+              </rules>
+              <fail>true</fail>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+        <version>${maven-checkstyle-plugin.version}</version>
+        <dependencies>
+          <dependency>
+            <groupId>com.puppycrawl.tools</groupId>
+            <artifactId>checkstyle</artifactId>
+            <version>${checkstyle.version}</version>
+          </dependency>
+          <dependency>
+            <groupId>com.github.ngeor</groupId>
+            <artifactId>checkstyle-rules</artifactId>
+            <version>${checkstyle-rules.version}</version>
+          </dependency>
+        </dependencies>
+        <configuration>
+          <configLocation>com/github/ngeor/checkstyle.xml</configLocation>
+          <includeTestSourceDirectory>true</includeTestSourceDirectory>
+          <skip>${skipTests}</skip>
+        </configuration>
+        <executions>
+          <execution>
+            <id>checkstyle</id>
+            <phase>validate</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>${maven-surefire-plugin.version}</version>
+      </plugin>
+      <plugin>
+        <groupId>org.jacoco</groupId>
+        <artifactId>jacoco-maven-plugin</artifactId>
+        <version>${jacoco-maven-plugin.version}</version>
+        <executions>
+          <execution>
+            <id>pre-unit-test</id>
+            <goals>
+              <goal>prepare-agent</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>post-unit-test</id>
+            <phase>test</phase>
+            <goals>
+              <goal>report</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>check-unit-test</id>
+            <phase>test</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+            <configuration>
+              <dataFile>${project.build.directory}/jacoco.exec</dataFile>
+              <rules>
+                <rule>
+                  <element>BUNDLE</element>
+                  <limits>
+                    <limit>
+                      <counter>INSTRUCTION</counter>
+                      <value>COVEREDRATIO</value>
+                      <minimum>${jacoco.unit-tests.limit.instruction-ratio}</minimum>
+                    </limit>
+                    <limit>
+                      <counter>BRANCH</counter>
+                      <value>COVEREDRATIO</value>
+                      <minimum>${jacoco.unit-tests.limit.branch-ratio}</minimum>
+                    </limit>
+                  </limits>
+                </rule>
+                <rule>
+                  <element>CLASS</element>
+                  <limits>
+                    <limit>
+                      <counter>COMPLEXITY</counter>
+                      <value>TOTALCOUNT</value>
+                      <maximum>${jacoco.unit-tests.limit.class-complexity}</maximum>
+                    </limit>
+                  </limits>
+                </rule>
+                <rule>
+                  <element>METHOD</element>
+                  <limits>
+                    <limit>
+                      <counter>COMPLEXITY</counter>
+                      <value>TOTALCOUNT</value>
+                      <maximum>${jacoco.unit-tests.limit.method-complexity}</maximum>
+                    </limit>
+                  </limits>
+                </rule>
+              </rules>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+  <reporting>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-javadoc-plugin</artifactId>
+        <version>${maven-javadoc-plugin.version}</version>
+      </plugin>
+    </plugins>
+  </reporting>
+  <profiles>
+    <!-- Publish coverage report to Coveralls, only when running in Travis. -->
+    <profile>
+      <id>travis</id>
+      <activation>
+        <property>
+          <name>env.TRAVIS</name>
+        </property>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.eluder.coveralls</groupId>
+            <artifactId>coveralls-maven-plugin</artifactId>
+            <version>${coveralls-maven-plugin.version}</version>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+</project>

perftest/src/main/java/nz/ac/massey/javaecs/examples/App.java

@@ -0,0 +1,65 @@
+package nz.ac.massey.javaecs.examples;
+
+import nz.ac.massey.javaecs.*;
+import nz.ac.massey.javaecs.examples.Components.*;
+import nz.ac.massey.javaecs.examples.Systems.*;
+
+/**
+ * Benchmark,
+ * A port of https://github.com/abeimler/ecs_benchmark 
+ */
+public final class App {
+    private App() {
+    }
+
+    /**
+     * Says hello to the world.
+     * @param args The arguments of the program.
+     * @throws InterruptedException
+     */
+    public static void main(String[] args) throws InterruptedException {
+        int nEntities = 1_000_000;
+        double startTime = System.nanoTime();
+        Engine engine = new Engine(nEntities);
+        double endTime = System.nanoTime();
+
+        System.out.println("Constructor Time taken: " + (endTime - startTime) / 1e6+ " ms " + "("+ (endTime - startTime) / 1e9 + " seconds )");
+        
+
+        engine.registerComponent(ComflabulationComponent.class);
+        engine.registerComponent(DirectionComponent.class);
+        engine.registerComponent(PositionComponent.class);
+
+        ComflabSystem comflabSystem = new ComflabSystem(engine);
+        engine.registerSystem(ComflabSystem.class, comflabSystem);
+
+        MovementSystem movementSystem = new MovementSystem(engine);
+        engine.registerSystem(MovementSystem.class, movementSystem);
+
+        startTime = System.nanoTime();
+
+        for (int i = 0; i < nEntities; i++) {
+            Entity entity = engine.createEntity();
+            engine.addComponent(entity, PositionComponent.class, new PositionComponent());
+            engine.addComponent(entity, DirectionComponent.class, new DirectionComponent());
+            if (i % 2 != 0){
+                engine.addComponent(entity, ComflabulationComponent.class, new ComflabulationComponent());
+            }
+            
+        }
+        endTime = System.nanoTime();
+
+        System.out.println("Entity creation Time taken: " + (endTime - startTime) / 1e6+ " ms " + "("+ (endTime - startTime) / 1e9 + " seconds )");
+        // Delay as object creation is multithreaded in at least OpenJDK 1.8 - lets use see the single core performance
+        Thread.sleep(5000);
+        double dt = 1.0f/60.0f;
+        startTime = System.nanoTime();
+        movementSystem.update(dt);
+        comflabSystem.update(dt);
+        endTime = System.nanoTime();
+
+        System.out.println("Single Loop Time taken: " + (endTime - startTime) / 1e6+ " ms " + "("+ (endTime - startTime) / 1e9 + " seconds )");
+
+        System.out.println("Hello World!");
+    }
+}

perftest/src/main/java/nz/ac/massey/javaecs/examples/Components/ComflabulationComponent.java

@@ -0,0 +1,22 @@
+package nz.ac.massey.javaecs.examples.Components;
+
+public class ComflabulationComponent {
+    public double thingy;
+    public int dingy;
+    public boolean mingy;
+    public String stringy;
+
+    public ComflabulationComponent(double thingy, int dingy, boolean mingy, String stringy){
+        this.thingy = thingy;
+        this.dingy = dingy;
+        this.mingy = mingy;
+        this.stringy = stringy;
+    }
+
+    public ComflabulationComponent(){
+        thingy =  0.0f;
+        dingy = 0;
+        mingy = false;
+        stringy = "";
+    }
+}

perftest/src/main/java/nz/ac/massey/javaecs/examples/Components/DirectionComponent.java

@@ -0,0 +1,16 @@
+package nz.ac.massey.javaecs.examples.Components;
+
+public class DirectionComponent {
+    public double x;
+    public double y;
+
+    public DirectionComponent(double x, double y){
+        this.x = x;
+        this.y = y;
+    }
+
+    public DirectionComponent(){
+        x = 0.0f;
+        y = 0.0f;
+    }
+}

perftest/src/main/java/nz/ac/massey/javaecs/examples/Components/PositionComponent.java

@@ -0,0 +1,16 @@
+package nz.ac.massey.javaecs.examples.Components;
+
+public class PositionComponent {
+    public double x;
+    public double y;
+
+    public PositionComponent(double x, double y){
+        this.x = x;
+        this.y = y;
+    }
+
+    public PositionComponent(){
+        x = 0.0f;
+        y = 0.0f;
+    }
+}

perftest/src/main/java/nz/ac/massey/javaecs/examples/Systems/ComflabSystem.java

@@ -0,0 +1,34 @@
+package nz.ac.massey.javaecs.examples.Systems;
+
+import java.util.BitSet;
+
+import nz.ac.massey.javaecs.ECSSystem;
+import nz.ac.massey.javaecs.Engine;
+import nz.ac.massey.javaecs.Entity;
+import nz.ac.massey.javaecs.examples.Components.ComflabulationComponent;
+
+public class ComflabSystem extends ECSSystem  {
+    Engine ecs;
+
+    public ComflabSystem(Engine ecs){
+        this.ecs = ecs;
+        registrationSet = new BitSet();
+        registrationSet.set(ecs.getComponentIndex(ComflabulationComponent.class));
+    }
+
+    @Override
+    public void init() {
+        // TODO Auto-generated method stub
+        
+    }
+
+    @Override
+    public void update(double dt) {
+        for (Entity entity : entities) {
+            ComflabulationComponent comflab = (ComflabulationComponent)ecs.getComponentData(entity, ComflabulationComponent.class);
+            comflab.thingy *= 1.000001;
+            comflab.mingy = !comflab.mingy;
+            comflab.dingy++;
+        } 
+    }
+}

perftest/src/main/java/nz/ac/massey/javaecs/examples/Systems/MovementSystem.java

@@ -0,0 +1,39 @@
+package nz.ac.massey.javaecs.examples.Systems;
+
+import java.util.BitSet;
+
+import nz.ac.massey.javaecs.ECSSystem;
+import nz.ac.massey.javaecs.Engine;
+import nz.ac.massey.javaecs.Entity;
+import nz.ac.massey.javaecs.examples.Components.DirectionComponent;
+import nz.ac.massey.javaecs.examples.Components.PositionComponent;
+
+public class MovementSystem extends ECSSystem {
+    Engine ecs;
+
+    public MovementSystem(Engine ecs){
+        this.ecs = ecs;
+        registrationSet = new BitSet();
+        registrationSet.set(ecs.getComponentIndex(PositionComponent.class));
+        registrationSet.set(ecs.getComponentIndex(DirectionComponent.class));
+    }
+
+    @Override
+    public void init() {
+        // TODO Auto-generated method stub
+        
+    }
+
+    @Override
+    public void update(double dt) {
+        for (Entity entity : entities) {
+            PositionComponent position = (PositionComponent)ecs.getComponentData(entity, PositionComponent.class);
+            DirectionComponent direction = (DirectionComponent)ecs.getComponentData(entity, DirectionComponent.class);
+            position.x += direction.x * dt;
+            position.y += direction.y * dt;
+        }
+        
+        
+    }
+    
+}

perftest/src/test/java/nz/ac/massey/javaecs/examples/AppTest.java

@@ -0,0 +1,18 @@
+package nz.ac.massey.javaecs.examples;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Unit test for simple App.
+ */
+class AppTest {
+    /**
+     * Rigorous Test.
+     */
+    @Test
+    void testApp() {
+        assertEquals(1, 1);
+    }
+}