ADH-5240

- refactored page process provider

plugin/trino-adb/src/main/java/io/trino/plugin/adb/connector/protocol/gpfdist/load/process/GpfdistPageProcessorProvider.java

@@ -43,7 +43,6 @@ public void add(PageProcessor processor)
         lock.lock();
         try {
             pageProcessors.add(processor);
-            isReadyForProcessing.set(true);
             isReadyForProcessingCondition.signalAll();
         }
         finally {
@@ -71,6 +70,7 @@ public PageProcessor take()
                         throw new RuntimeException(e);
                     }
                 }
+                isReadyForProcessing.set(true);
             }
             PageProcessor pageProcessor = pageProcessors.poll();
             pageProcessors.offer(pageProcessor);