Extract ObjectSleeper.sleep() method to make it reusable (e.g. in m…

…etafacture-fix). (#559)

metafacture-flowcontrol/src/main/java/org/metafacture/flowcontrol/ObjectSleeper.java

@@ -65,15 +65,22 @@ public long getSleepTime() {
         return sleepTime;
     }
 
-    @Override
-    public void process(final T obj) {
+    /**
+     * Sleeps for the specified amount of time.
+     */
+    public void sleep() {
         try {
             Thread.sleep(sleepTime);
         }
         catch (final InterruptedException e) {
             Thread.currentThread().interrupt();
             throw new MetafactureException(e.getMessage(), e);
         }
+    }
+
+    @Override
+    public void process(final T obj) {
+        sleep();
         getReceiver().process(obj);
     }