EdgeGrpcSession - move check of empty high priority msgs into submethod

application/src/main/java/org/thingsboard/server/service/edge/rpc/EdgeGrpcSession.java

@@ -292,9 +292,7 @@ public abstract class EdgeGrpcSession implements Closeable {
 
     protected void processEdgeEvents(EdgeEventFetcher fetcher, PageLink pageLink, SettableFuture<Pair<Long, Long>> result) {
         try {
-            if (!highPriorityQueue.isEmpty()) {
-                processHighPriorityEvents();
-            }
+            processHighPriorityEvents();
             PageData<EdgeEvent> pageData = fetcher.fetchEdgeEvents(edge.getTenantId(), edge, pageLink);
             if (isConnected() && !pageData.getData().isEmpty()) {
                 log.trace("[{}][{}][{}] event(s) are going to be processed.", tenantId, sessionId, pageData.getData().size());
@@ -537,6 +535,9 @@ public abstract class EdgeGrpcSession implements Closeable {
     public void processHighPriorityEvents() {
         try {
             if (isConnected() && isSyncCompleted()) {
+                if (highPriorityQueue.isEmpty()) {
+                    return;
+                }
                 List<EdgeEvent> highPriorityEvents = new ArrayList<>();
                 EdgeEvent event;
                 while ((event = highPriorityQueue.poll()) != null) {
@@ -606,8 +607,13 @@ public abstract class EdgeGrpcSession implements Closeable {
                 }
             }, ctx.getGrpcCallbackExecutorService());
         } else {
-            log.trace("[{}][{}] edge is not connected or sync is not completed. Skipping iteration", tenantId, sessionId);
-            result.set(null);
+            if (!isSyncCompleted()) {
+                log.trace("[{}][{}] edge sync is not completed yet. Skipping iteration", tenantId, sessionId);
+                result.set(Boolean.TRUE);
+            } else {
+                log.trace("[{}][{}] edge is not connected. Skipping iteration", tenantId, sessionId);
+                result.set(null);
+            }
         }
         return result;
     }