From b0aa6e72013861020f0c270ceeabbe70a7dfe065 Mon Sep 17 00:00:00 2001
From: Nikita <abracham.mitchell@gmail.com>
Date: Tue, 1 May 2018 18:11:13 +0300
Subject: [PATCH] RExecutorService.countActiveWorkers hangs if there no
 registered workers.  #1387

---
 .../src/main/java/org/redisson/RedissonExecutorService.java   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/redisson/src/main/java/org/redisson/RedissonExecutorService.java b/redisson/src/main/java/org/redisson/RedissonExecutorService.java
index 8b610049c..aed77a9cf 100644
--- a/redisson/src/main/java/org/redisson/RedissonExecutorService.java
+++ b/redisson/src/main/java/org/redisson/RedissonExecutorService.java
@@ -199,6 +199,10 @@ public class RedissonExecutorService implements RScheduledExecutorService {
     public int countActiveWorkers() {
         String id = generateRequestId();
         int subscribers = (int) workersTopic.publish(id);
+        if (subscribers == 0) {
+            return 0;
+        }
+
         RSemaphore semaphore = redisson.getSemaphore(workersSemaphoreName + ":" + id);
         try {
             semaphore.tryAcquire(subscribers, 10, TimeUnit.MINUTES);