Make CompletableTask potentially extendable to RunnablePromise (protected access to runTask)

Author: vsilaev

src/main/java/net/tascalate/concurrent/CompletableTask.java

@@ -240,6 +240,10 @@ public static Promise<Duration> delay(Duration duration, Executor executor) {
                .unwrap();
     }
 
+    protected void runTask() {
+        task.run();
+    }
+    
     @Override
     void fireTransition(Callable<T> code) {
         throw new UnsupportedOperationException();

src/main/java/net/tascalate/concurrent/TaskExecutors.java

@@ -19,7 +19,6 @@
 import java.util.List;
 
 import java.util.concurrent.Callable;
-import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Executor;
 import java.util.concurrent.ExecutorService;
@@ -185,8 +184,7 @@ static <T> RunnablePromise<T> newRunnablePromise(Executor executor, Callable<T>
     }
 
     static class RunnableCompletableTask<T> extends CompletableTask<T> 
-                                            implements RunnablePromise<T>,
-                                                       CompletableFuture.AsynchronousCompletionTask{
+                                            implements RunnablePromise<T> {
 
         RunnableCompletableTask(Executor executor, Callable<T> callable) {
             super(executor, callable);
@@ -195,7 +193,7 @@ static class RunnableCompletableTask<T> extends CompletableTask<T>
 
         @Override
         public void run() {
-            task.run();
+            runTask();
         }
     }