c++ - How to implement a WebSocket server serving only 1 client at a time -

i'm using websocket++ library implement websocket server.

due characteristic of server, serve 1 client @ time. is, once client has been connected server, stop listening other potential clients until connected client disconnects.

currently server looks like:

typedef websocketpp::server<websocketpp::config::asio> server; static void onreceivedata(server *s, websocketpp::connection_hdl hdl, server::message_ptr msg) {     std::string payload(msg->get_payload());     // process inside payload     websocketpp::lib::error_code ec;     s->send(hdl, payload, websocketpp::frame::opcode::binary, ec); }  int main(void) {     server myserver;     myserver.init_asio();     myserver.set_message_handler(websocketpp::lib::bind(&onreceivedata, &myserver, websocketpp::lib::placeholders::_1, websocketpp::lib::placeholders::_2));     myserver.listen(9002);     myserver.start_accept();     myserver.run(); } 

how should pause , resume listening, or there parameter limiting number of concurrent clients?

use validate decide when accept or refuse connection:

static bool accept_new_connections = true;  bool validate(server *, websocketpp::connection_hdl) {     return accept_new_connections; }  void on_open(server *, websocketpp::connection_hdl hdl) {     accept_new_connections = false; }  void on_close(server *, websocketpp::connection_hdl hdl) {     accept_new_connections = true; } 

obviously make above work need set additional handlers open, close , validate:

myserver.set_open_handler(bind(&on_open, &echo_server, ::_1)); myserver.set_close_handler(bind(&on_close, &echo_server, ::_1)); myserver.set_validate_handler(bind(&validate, &echo_server, ::_1));