From 02cfe40f8ad2c2f095aaa779aa081426f1ad3780 Mon Sep 17 00:00:00 2001
From: howiekang <1494797292@qq.com>
Date: Sat, 1 Jan 2022 11:06:16 +0800
Subject: [PATCH] Fix DynamicSentinelProperty synchronized listener set
 iterator race-condition problem (#2519)

---
 .../csp/sentinel/property/DynamicSentinelProperty.java   | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/sentinel-core/src/main/java/com/alibaba/csp/sentinel/property/DynamicSentinelProperty.java b/sentinel-core/src/main/java/com/alibaba/csp/sentinel/property/DynamicSentinelProperty.java
index b432df71..94648d4a 100755
--- a/sentinel-core/src/main/java/com/alibaba/csp/sentinel/property/DynamicSentinelProperty.java
+++ b/sentinel-core/src/main/java/com/alibaba/csp/sentinel/property/DynamicSentinelProperty.java
@@ -15,15 +15,14 @@
  */
 package com.alibaba.csp.sentinel.property;
 
-import java.util.Collections;
-import java.util.HashSet;
-import java.util.Set;
-
 import com.alibaba.csp.sentinel.log.RecordLog;
 
+import java.util.Set;
+import java.util.concurrent.CopyOnWriteArraySet;
+
 public class DynamicSentinelProperty<T> implements SentinelProperty<T> {
 
-    protected Set<PropertyListener<T>> listeners = Collections.synchronizedSet(new HashSet<PropertyListener<T>>());
+    protected Set<PropertyListener<T>> listeners = new CopyOnWriteArraySet<>();
     private T value = null;
 
     public DynamicSentinelProperty() {