Avoid allocating a wrapper for a runnable every time an actor is scheduled

src/main/java/org/syndicate_lang/actors/Actor.java

@@ -13,10 +13,10 @@ import java.util.logging.Logger;
 /**
  * I represent the shared execution concepts for a collection of objects; I am roughly analogous to the E concept of a Vat.
  */
-public class Actor {
+public class Actor extends ForkJoinTask<Void> {
     private final static AtomicLong _count = new AtomicLong(0);
     private final static AtomicLong _actorId = new AtomicLong(0);
-    protected final static ExecutorService _executor = new ForkJoinPool(
+    protected final static ForkJoinPool _executor = new ForkJoinPool(
         Runtime.getRuntime().availableProcessors(),
         ForkJoinPool.defaultForkJoinWorkerThreadFactory,
         null,
@@ -212,12 +212,14 @@ public class Actor {
         }
     }
 
-    private Runnable __runWorkItems = this::_runWorkItems;
+    public final Void getRawResult() { return null; }
+    public final void setRawResult(Void v) { }
+    public final boolean exec() { this._runWorkItems(); return false; }
 
     public void execute(WorkItem item) {
         tail.getAndSet(item).set(item);
         if (workItemCount.getAndIncrement() == 0) {
-            _executor.execute(__runWorkItems);
+            _executor.execute(this);
         }
     }