diff --git a/src/java/com/samskivert/util/Invoker.java b/src/java/com/samskivert/util/Invoker.java
index 2416cb62..2a72f198 100644
--- a/src/java/com/samskivert/util/Invoker.java
+++ b/src/java/com/samskivert/util/Invoker.java
@@ -27,6 +27,7 @@ import com.samskivert.Log;
  * invoker is desirable.
  */
 public class Invoker extends LoopingThread
+    implements RunQueue
 {
     /**
      * The unit encapsulates a unit of executable code that will be run on
@@ -122,6 +123,23 @@ public class Invoker extends LoopingThread
         _queue.append(unit);
     }
 
+    // from RunQueue
+    public void postRunnable (final Runnable r)
+    {
+        postUnit(new Unit() {
+            public boolean invoke () {
+                r.run();
+                return false;
+            }
+        });
+    }
+
+    // from RunQueue
+    public boolean isDispatchThread ()
+    {
+        return (this == Thread.currentThread());
+    }
+
     // documentation inherited
     public void iterate ()
     {