fix: Add warning about conflict signaling URL (#887)

* add warning about conflict signaling settings

* Revert "add warning about conflict signaling settings"

This reverts commit 6fbbc71.

* add warning when same url signaling instance

Author: kannan-xiao4

com.unity.renderstreaming/Runtime/Scripts/Signaling/HttpSignaling.cs

@@ -1,5 +1,7 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Net;
 using System.Threading;
 using Unity.WebRTC;
@@ -9,9 +11,11 @@ namespace Unity.RenderStreaming.Signaling
 {
     public class HttpSignaling : ISignaling
     {
-        private string m_url;
-        private int m_timeout;
-        private SynchronizationContext m_mainThreadContext;
+        private static HashSet<HttpSignaling> instances = new HashSet<HttpSignaling>();
+
+        private readonly string m_url;
+        private readonly int m_timeout;
+        private readonly SynchronizationContext m_mainThreadContext;
         private bool m_running;
         private Thread m_signalingThread;
 
@@ -35,11 +39,19 @@ public HttpSignaling(SignalingSettings signalingSettings, SynchronizationContext
                 ServicePointManager.ServerCertificateValidationCallback =
                     (sender, certificate, chain, errors) => true;
             }
+
+            if (instances.Any(x => x.Url == m_url))
+            {
+                Debug.LogWarning($"Other {nameof(HttpSignaling)} exists with same URL:{m_url}. Signaling process may be in conflict.");
+            }
+
+            instances.Add(this);
         }
 
         ~HttpSignaling()
         {
             Stop();
+            instances.Remove(this);
         }
 
         public void Start()

com.unity.renderstreaming/Runtime/Scripts/Signaling/WebSocketSignaling.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Security.Authentication;
 using System.Text;
 using System.Threading;
@@ -10,12 +12,14 @@ namespace Unity.RenderStreaming.Signaling
 {
     public class WebSocketSignaling : ISignaling
     {
-        private string m_url;
-        private float m_timeout;
-        private SynchronizationContext m_mainThreadContext;
+        private static HashSet<WebSocketSignaling> instances = new HashSet<WebSocketSignaling>();
+
+        private readonly string m_url;
+        private readonly float m_timeout;
+        private readonly SynchronizationContext m_mainThreadContext;
         private bool m_running;
         private Thread m_signalingThread;
-        private AutoResetEvent m_wsCloseEvent;
+        private readonly AutoResetEvent m_wsCloseEvent;
         private WebSocket m_webSocket;
 
         public string Url { get { return m_url; } }
@@ -30,12 +34,21 @@ public WebSocketSignaling(SignalingSettings signalingSettings, SynchronizationCo
             m_timeout = 5.0f;
             m_mainThreadContext = mainThreadContext;
             m_wsCloseEvent = new AutoResetEvent(false);
+
+            if (instances.Any(x => x.Url == m_url))
+            {
+                Debug.LogWarning($"Other {nameof(WebSocketSignaling)} exists with same URL:{m_url}. Signaling process may be in conflict.");
+            }
+
+            instances.Add(this);
         }
 
         ~WebSocketSignaling()
         {
             if (m_running)
                 Stop();
+
+            instances.Remove(this);
         }
 
         public void Start()