Dlang,Socket,Chat Server

[sarahjohn]

I want to write a chat server. Using the programming language D. 
(Dlang) It is desirable to use OOP.

My example.(Not working)

import std.stdio;
import std.concurrency;
import core.thread;
import std.conv;
import std.socket;

synchronized class DataInfo{
     shared this()
     {
     }
     public shared Socket[] sockList;
     shared void AddSocket(shared Socket scket)
     {
         sockList ~= scket;
     }

     shared(Socket[]) getSockList()
     {
         return to!(shared Socket[])(sockList);
     }
}
void UserLoop(shared DataInfo data,shared(int) id)
{
     Socket client;
     synchronized(data)
     {
         client = cast(Socket)(data.sockList[id]);
     }

     while(true)
     {
         char[1024] buffer;
         int sockCount = 0;
         client.receive(buffer);
         synchronized(data)
         {
             sockCount = data.sockList.length;
         }

         for(int i =0 ; i < sockCount; i++)
         {
             synchronized(data)
             {
                 auto sk = cast( Socket)(data.sockList[i]);
                 sk.send("Hello world");
             }
         }
     }
}

int main()
{

         ushort port;
         port = 4444;

         auto listener = new TcpSocket();
         assert(listener.isAlive);
         listener.blocking = false;
         listener.bind(new InternetAddress(port));
         listener.listen(10);
         writefln("Listening on port %d.", port);
         shared(DataInfo) data = new shared(DataInfo);
         while(true)
         {
             int len = 0;
             auto client = cast(shared Socket)listener.accept();
             synchronized(data)
             {
                 data.AddSocket(client);
                 len = data.sockList.length;
             }
             spawn(&UserLoop,data,cast(shared int)len);
         }
         return 0;
}
How? How to fix the bug? Can I get an example of correct chat 
servers? (Only Dlang & 
(Hadoop)[https://mindmajix.com/hadoop-training]) Also, can you 
give an example of the correct client.

Help me on this!