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<h1 class="page">Your Own Logic Thread</h1>
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<p>You can add AppStates to the SimpleApplication and your whole program will run on a single thread.
This can have benefits, but this Entity System is optimized to run on several Threads.
Because of this, it is recommended that you run the game logic in a separate thread and independent from the framerate.
In this example, we will say that we want to run the game logic every 20 milliseconds. This means 50 updates per second and a tpf value of 0.2f   .</p>
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<h2 id="gamelogic-class"><a class="anchor" href="#gamelogic-class"></a>GameLogic class</h2>
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<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class GameLogicThread implements Runnable {

    private final float tpf = 0.02f;
    private AppStateManager stateManager;

    public GameLogicThread(Application app) {
        stateManager = new AppStateManager(app);

        //add the logic AppStates to this thread
        stateManager.attach(new MovementAppState());
        stateManager.attach(new ExpiresAppState());
        stateManager.attach(new CollisionAppState());
        stateManager.attach(new EnemyAppState());
    }

    public void run() {
        stateManager.update(tpf);
    }
}</code></pre>
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<h2 id="application"><a class="anchor" href="#application"></a>Application</h2>
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<pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java">public class Example extends SimpleApplication {

    private EntitySystem entitySystem;
    private ScheduledExecutorService exec;

    @Override
    public void simpleInitApp() {

        //Init the Entity System
        entitySystem = new EntitySystem(new MapEntityData());

        //Init the Game Systems for the visualisation
        stateManager.attach(new EntityDisplayAppState(rootNode));
        stateManager.attach(new PlayerInputAppState());

        //create the Thread for the game logic
        exec = Executors.newSingleThreadScheduledExecutor();
        exec.scheduleAtFixedRate(new GameLogicThread(this), 0, 20, TimeUnit.MILLISECONDS);
    }

    public EntitySystem getEntitySystem() {
        return entitySystem;
    }

    @Override
    public void destroy() {
        super.destroy();
        //Shutdown the thread when the game is closed
        exec.shutdown();
    }
}</code></pre>
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