From 7d861e3ae328168621aa68d6aad893aa86ba1a45 Mon Sep 17 00:00:00 2001
From: Mygod <contact-github@mygod.be>
Date: Sun, 14 Oct 2018 14:51:41 +0800
Subject: [PATCH] Fix ConcurrentModificationException

---
 .../java/be/mygod/vpnhotspot/net/monitor/UpstreamMonitor.kt   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/UpstreamMonitor.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/UpstreamMonitor.kt
index 2f0b8e71..8c30f5fa 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/UpstreamMonitor.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/UpstreamMonitor.kt
@@ -4,6 +4,8 @@ import android.content.SharedPreferences
 import android.net.LinkProperties
 import be.mygod.vpnhotspot.App.Companion.app
 import java.net.InetAddress
+import java.util.*
+import java.util.concurrent.ConcurrentHashMap
 
 abstract class UpstreamMonitor {
     companion object : SharedPreferences.OnSharedPreferenceChangeListener {
@@ -63,7 +65,7 @@ abstract class UpstreamMonitor {
         }
     }
 
-    val callbacks = HashSet<Callback>()
+    val callbacks = Collections.newSetFromMap(ConcurrentHashMap<Callback, Boolean>())
     protected abstract val currentLinkProperties: LinkProperties?
     open val currentIface: String? get() = currentLinkProperties?.interfaceName
     /**