Also notify waiting lists when a single URL has been schedules, instead

of only after scheduleAll.

Author: EgbertW

src/main/java/edu/uci/ics/crawler4j/frontier/Frontier.java

@@ -120,6 +120,11 @@ public void schedule(WebURL url) {
         logger.error("Error while putting the url in the work queue", e);
       }
     }
+    
+    // Wake up threads
+    synchronized (waitingList) {
+      waitingList.notifyAll();
+    }
   }
 
   public void getNextURLs(int max, List<WebURL> result) {
@@ -198,4 +203,4 @@ public void finish() {
       waitingList.notifyAll();
     }
   }
-}
+}