Added support for physics listeners. Necessary for the real solution

pspeed42 · pspeed42 · commit 3423e5254c14 · 2016-08-13T03:17:23.000-04:00
and I'll use it to temporarily send upates the 'naive' way.
diff --git a/sim-eth-basic/src/main/java/example/sim/PhysicsListener.java b/sim-eth-basic/src/main/java/example/sim/PhysicsListener.java
@@ -0,0 +1,54 @@
+/*
+ * $Id$
+ * 
+ * Copyright (c) 2016, Simsilica, LLC
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions 
+ * are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in 
+ *    the documentation and/or other materials provided with the 
+ *    distribution.
+ * 
+ * 3. Neither the name of the copyright holder nor the names of its 
+ *    contributors may be used to endorse or promote products derived 
+ *    from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package example.sim;
+
+import com.simsilica.sim.SimTime;
+
+/**
+ *
+ *
+ *  @author    Paul Speed
+ */
+public interface PhysicsListener {
+
+    public void beginFrame( SimTime time );
+ 
+    public void updateBody( Body body );
+    
+    public void endFrame( SimTime time ); 
+    
+}
diff --git a/sim-eth-basic/src/main/java/example/sim/SimplePhysics.java b/sim-eth-basic/src/main/java/example/sim/SimplePhysics.java
@@ -58,9 +58,24 @@ public class SimplePhysics extends AbstractGameSystem {
     
     private ConcurrentLinkedQueue<Body> toAdd = new ConcurrentLinkedQueue<>();
     private ConcurrentLinkedQueue<Body> toRemove = new ConcurrentLinkedQueue<>();
+ 
+    private SafeArrayList<PhysicsListener> listeners = new SafeArrayList<>(PhysicsListener.class);
     
     public SimplePhysics() {
     }
+ 
+    /**
+     *  Adds a listener that will be notified about physics related updates.
+     *  This is not a thread safe method call so must be called during setup
+     *  or from the physics/simulation thread.
+     */   
+    public void addPhysicsListener( PhysicsListener l ) {
+        listeners.add(l);
+    }
+
+    public void removePhysicsListener( PhysicsListener l ) {
+        listeners.remove(l);
+    }
     
     public int createBody() {
         return createBody(null);        
@@ -106,6 +121,10 @@ private void updateBodyList() {
 
     @Override
     public void update( SimTime time ) {
+ 
+        for( PhysicsListener l : listeners.getArray() ) {
+            l.beginFrame(time);
+        }
         
         updateBodyList();
  
@@ -123,7 +142,16 @@ public void update( SimTime time ) {
             b.integrate(tpf);
         }
  
-        // Publish the results       
+        // Publish the results
+        for( PhysicsListener l : listeners.getArray() ) {
+            for( Body b : bodies.getArray() ) {
+                l.updateBody(b);
+            }
+        }
+               
+        for( PhysicsListener l : listeners.getArray() ) {
+            l.endFrame(time);
+        }
     }
     
 }
