Leverage utility class for determining thread type.

Author: rlubke

providers/grizzly/src/main/java/org/asynchttpclient/providers/grizzly/FeedableBodyGenerator.java

@@ -31,6 +31,7 @@
 import org.glassfish.grizzly.impl.FutureImpl;
 import org.glassfish.grizzly.nio.NIOConnection;
 import org.glassfish.grizzly.nio.SelectorRunner;
+import org.glassfish.grizzly.threadpool.Threads;
 import org.glassfish.grizzly.utils.Futures;
 
 import static java.lang.Boolean.TRUE;
@@ -185,7 +186,7 @@ public void run() {
         // If the current thread is a selector thread, we need to execute
         // the remainder of the task on the worker thread to prevent
         // it from being blocked.
-        if (isCurrentThreadSelectorRunner()) {
+        if (isServiceThread()) {
             c.getTransport().getWorkerThreadPool().execute(r);
         } else {
             r.run();
@@ -196,10 +197,8 @@ public void run() {
     // --------------------------------------------------------- Private Methods
 
 
-    private boolean isCurrentThreadSelectorRunner() {
-        final NIOConnection c = (NIOConnection) context.getConnection();
-        final SelectorRunner runner = c.getSelectorRunner();
-        return (Thread.currentThread() == runner.getRunnerThread());
+    private boolean isServiceThread() {
+        return Threads.isService();
     }