Cached ping executor

core/src/mindustry/net/Net.java

@@ -34,7 +34,7 @@ public class Net{
     private final ObjectMap<Class<?>, Cons> clientListeners = new ObjectMap<>();
     private final ObjectMap<Class<?>, Cons2<NetConnection, Object>> serverListeners = new ObjectMap<>();
     private final IntMap<StreamBuilder> streams = new IntMap<>();
-    private final ExecutorService pingExecutor = Threads.executor(Math.max(Runtime.getRuntime().availableProcessors(), 6));
+    private final ExecutorService pingExecutor = Threads.cachedExecutor();
 
     private final NetProvider provider;
 
@@ -326,13 +326,6 @@ public class Net{
         pingExecutor.submit(() -> provider.pingHost(address, port, valid, failed));
     }
 
-    /**
-     * Pings a host in an new thread. If an error occurred, failed() should be called with the exception.
-     */
-    public void pingHostThread(String address, int port, Cons<Host> valid, Cons<Exception> failed){
-        Threads.daemon(() -> provider.pingHost(address, port, valid, failed));
-    }
-
     /**
      * Whether the net is active, e.g. whether this is a multiplayer game.
      */

core/src/mindustry/ui/dialogs/JoinDialog.java

@@ -375,7 +375,7 @@ public class JoinDialog extends BaseDialog{
             for(String address : group.addresses){
                 String resaddress = address.contains(":") ? address.split(":")[0] : address;
                 int resport = address.contains(":") ? Strings.parseInt(address.split(":")[1]) : port;
-                net.pingHostThread(resaddress, resport, res -> {
+                net.pingHost(resaddress, resport, res -> {
                     if(refreshes != cur) return;
                     res.port = resport;