Added enqueue runnable

jme3-core/src/main/java/com/jme3/app/Application.java

@@ -650,6 +650,8 @@ public class Application implements SystemListener {
      * Callables are executed right at the beginning of the main loop.
      * They are executed even if the application is currently paused
      * or out of focus.
+     * 
+     * @param callable The callable to run in the main jME3 thread
      */
     public <V> Future<V> enqueue(Callable<V> callable) {
         AppTask<V> task = new AppTask<V>(callable);
@@ -657,6 +659,20 @@ public class Application implements SystemListener {
         return task;
     }
     
+    /**
+     * Enqueues a runnable object to execute in the jME3
+     * rendering thread.
+     * <p>
+     * Runnables are executed right at the beginning of the main loop.
+     * They are executed even if the application is currently paused
+     * or out of focus.
+     * 
+     * @param runnable The runnable to run in the main jME3 thread
+     */    
+    public void enqueue(Runnable runnable){
+        enqueue(new RunnableWrapper(runnable));
+    }
+
     /**
      * Runs tasks enqueued via {@link #enqueue(Callable)}
      */
@@ -740,4 +756,19 @@ public class Application implements SystemListener {
         return viewPort;
     }
 
+    private class RunnableWrapper implements Callable{
+        private final Runnable runnable;
+
+        public RunnableWrapper(Runnable runnable){
+            this.runnable = runnable;
+        }
+
+        @Override
+        public Object call(){
+            runnable.run();
+            return null;
+        }
+        
+    }
+    
 }

jme3-examples/src/main/java/jme3test/app/TestEnqueueRunnable.java

@@ -0,0 +1,72 @@
+package jme3test.app;
+
+import com.jme3.app.SimpleApplication;
+import com.jme3.material.Material;
+import com.jme3.math.ColorRGBA;
+import com.jme3.scene.Geometry;
+import com.jme3.scene.shape.Box;
+
+/**
+ * @author john01dav
+ */
+public class TestEnqueueRunnable extends SimpleApplication{
+    private ExampleAsyncTask exampleAsyncTask;
+    
+    public static void main(String[] args){
+        new TestEnqueueRunnable().start();
+    }
+    
+    @Override
+    public void simpleInitApp(){
+        Geometry geom = new Geometry("Box", new Box(1, 1, 1));
+        Material material = new Material(getAssetManager(), "/Common/MatDefs/Misc/Unshaded.j3md");
+        material.setColor("Color", ColorRGBA.Blue); //a color is needed to start with
+        geom.setMaterial(material);
+        getRootNode().attachChild(geom);
+        
+        exampleAsyncTask = new ExampleAsyncTask(material);
+        exampleAsyncTask.getThread().start();
+    }
+
+    @Override
+    public void destroy(){
+        exampleAsyncTask.endTask();
+        super.destroy();
+    }
+    
+    private class ExampleAsyncTask implements Runnable{
+        private final Thread thread;
+        private final Material material;
+        private volatile boolean running = true;
+
+        public ExampleAsyncTask(Material material){
+            this.thread = new Thread(this);
+            this.material = material;
+        }
+
+        public Thread getThread(){
+            return thread;
+        }
+        
+        public void run(){
+            while(running){
+                enqueue(new Runnable(){ //primary usage of this in real applications would use lambda expressions which are unavailable at java 6
+                    public void run(){
+                        material.setColor("Color", ColorRGBA.randomColor());
+                    }
+                });
+                
+                try{
+                    Thread.sleep(1000);
+                }catch(InterruptedException e){}
+            }
+        }
+        
+        public void endTask(){
+            running = false;
+            thread.interrupt();
+        }
+        
+    }
+    
+}