dart - 如何从 Controller 检测Websocket连接的打开

Question

我有一个 Controller (MyController)，它在初始化时从websocket连接(wsService)请求数据。

检测并等待Websocket连接已打开然后发出来自 Controller 的请求的最佳方法是什么？

现在，我正在使用以下解决方案:

my_controller.dart:

MyController(wsService ws){
  // when refresh() in wsService is called, 
  // the call is redirected to MyController's load()
  ws.refresh = load; 
}

load(){
  ws.send(request);
}

ws_service.dart:

onConnect(){ //this is called when websocket connection is opened
  refresh(); //this calls MyController's load()
}

Answer 1

我仍然认为您应该执行类似的操作，而不是使Angular轮询状态。

MyController(wsService ws){
  if(ws.readyState == WebSocket.OPEN) {
    load();
  } else {
    ws.onOpen.first.then((_) => load());
  }
}

load(){
  ws.send(request);
}