WebRTC的Java WebSocket信令服务器

Question

我正在尝试为使用webrtc的简单Chatroom系统设置java / jetty websocket信令服务器。这只是我想要制作的多人游戏的前奏。我坚持的是当有人加入聊天室时如何通知其他同行，以及如何告诉这位新同伴关于谁已经进入聊天室。同样在客户端上，websocket.onopen事件似乎没有被触发，但是在服务器上，onOpen在客户端连接时被触发。

我使用了一些Muaz的代码，但我找不到兼容的例子。我显然错过了SDP部分。

<script src="https://cdn.webrtc-experiment.com/DataChannel.js"> </script>
<script>
var chatRoom = document.getElementById('chat-room');
var chatOutput = document.getElementById('chat-output');
var chatInput = document.getElementById('chat-input');
chatInput.onkeypress = function(e) {
    if (e.keyCode != 13) return;
    channel.send(this.value);
    chatOutput.innerHTML = 'Me: ' + this.value + '<hr />' 
                         + chatOutput.innerHTML;
    this.value = '';
};
roomName =chatRoom.value;
var channel = new DataChannel('Session Unique Identifier'); 

channel.onopen = function(userid) {
    chatInput.disabled = false;
    chatInput.value = 'Hi, ' + userid;
    chatInput.focus();
};

channel.onmessage = function(message, userid) {
    chatOutput.innerHTML = userid + ': ' + message + '<hr />' 
                         + chatOutput.innerHTML;
};

channel.onleave = function(userid) {
    chatOutput.innerHTML = userid + ' Left.<hr />' 
                         + chatOutput.innerHTML;
};


var websocket = new WebSocket('ws://localhost:8080/events/');
    channel.openSignalingChannel = function (config) {
        config.channel = config.channel || this.channel;

        websocket.channel = config.channel;
        websocket.onopen = function() {
            console.log("in onopen");// code is not reached for some reason
           // console.log(JSON.stringify({open: true,channel: config.channel}));
            websocket.push(JSON.stringify({
                open: true,
                channel: config.channel,
                op : "JoinRoom",
                RoomName : roomName

            }));
            if (config.callback)
                config.callback(websocket);
        };
        websocket.onmessage = function(event) {
            config.onmessage(JSON.parse(event.data));
        };
        websocket.push = websocket.send;
        websocket.send = function(data) {
            console.log(JSON.stringify({data: data,channel: config.channel}));
            websocket.push(JSON.stringify({
                data: data,
                channel: config.channel
            }));
        };
     };
</script>

对于我的WebSocketServer：

@WebSocket
@ServerEndpoint(value="/events/")
public class SignallingSocket  extends WebSocketHandler{
private static Map<String,ArrayList<Session>> rooms = new HashMap<String,ArrayList<Session>>(); //Collections.synchronizedSet(new HashSet<Session>());
Session sess;
String currentRoom="NOTSET";
JSONParser parser=new JSONParser();

@OnMessage
public String onMessage(String message) {
    //sess.getContainer().
    System.out.println("I just got " + message);
    Map json;
    try {
        json = (Map)parser.parse(message);
        String op = json.get("op").toString();
        if(op.equals("JoinRoom")){
            currentRoom = json.get("RoomName").toString();
            if(!rooms.containsKey(currentRoom)){
                rooms.put(currentRoom, new ArrayList<Session>());
            }
            ArrayList<Session> othersInRoom = rooms.get(currentRoom);
            for (Session otherPeer : othersInRoom) {
                 try{
                     otherPeer.getBasicRemote().sendText("Tell other peers in the room this new person has joined"); //How???
                  } catch (Exception ex) {
                      System.out.println("Broadcast error: "+ex.getMessage());
                  } 
            }
            sess.getBasicRemote().sendText("Tell this new peer about others already in the room");//How???
            rooms.get(currentRoom).add(sess);
        }
    }catch (Exception e) {
        System.out.println("Broadcast error: "+e.getMessage());
        e.printStackTrace();
    } 
    return "{\"someresponse\":\"What should i return\"}";
}

@OnOpen
public void onOpen (Session peer) { //This works
    this.sess = peer;
    System.out.println("A client connected");

}


@OnClose
public void onClose(Session peer) {
    //peers.remove(peer); 
    rooms.get(currentRoom).remove(peer);
    ArrayList<Session> othersInRoom = rooms.get(currentRoom);
    if(othersInRoom.size()==0){
        rooms.remove(currentRoom);
    }else{
        for (Session otherPeer : othersInRoom) {
             try{
                 otherPeer.getBasicRemote().sendText("Tell other peers in the room this person has left");//How???
              } catch (Exception ex) {
                  System.out.println("Broadcast error: "+ex.getMessage());
              } 
        }
    }
}

@OnError
public void onError(Throwable t) {
    t.printStackTrace();
}

//@Override
public void configure(WebSocketServletFactory factory) {
    factory.register(SignallingSocket.class);

}

}