问题
I'm building a websocket proof of concept based on atmosphere. Created a javascript client that subscribes to 2 channels, and created thread on the server that creates two broadcasters and keep sending data to then, but I'm not able to get the data on the client.
Is there a way to check if the messages are getting stuck on the server side or client side ? Am I dropping the ball somewhere ? :)
This is what I have until now :
PublishServerState - create the broadcasters and send message
import javax.servlet.http.HttpServlet;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.atmosphere.cpr.AtmosphereFramework;
import org.atmosphere.cpr.Broadcaster;
import org.atmosphere.cpr.BroadcasterFactory;
// TODO desligar os threads quando a app esta desligando
public class PublishServerState extends HttpServlet {
private static final long serialVersionUID = 1L;
public static String value1 = "um-";
public static String value2 = "dois-";
private final Logger logger = LogManager
.getLogger(PublishServerState.class);
private static BroadcasterFactory broadcasterFactory;
public void init() {
BasicConfigurator.configure();
logger.info("init()");
AtmosphereFramework framework = (AtmosphereFramework) getServletContext()
.getAttribute("AtmosphereServlet");
broadcasterFactory = framework.getBroadcasterFactory();
Thread t = new Thread() {
public void run() {
/**
* cria canais para publicacao separada, um para cada jogo
*/
logger.info("cria os canais");
Broadcaster canal1 = broadcasterFactory.get("/canal/1");
Broadcaster canal2 = broadcasterFactory.get("/canal/2");
logger.info("adiciona a lista");
GameSubscription.getInstance().addBroadCast("/canal/1", canal1);
GameSubscription.getInstance().addBroadCast("/canal/2", canal2);
long threshold = 5000;
int messages = 0;
long start = System.currentTimeMillis();
String time = "";
while (true) {
time = Long.toString(System.currentTimeMillis());
messages ++;
canal1.broadcast(new Response(value1 + time));
canal2.broadcast(new Response(value2 + time));
try {
Thread.sleep(20);
} catch (InterruptedException e) {
logger.error("erro interrompendo thread", e);
}
if (System.currentTimeMillis() - start > threshold) {
logger.info("broadcasting messages, sent " + messages + " messages.");
messages = 0;
start = System.currentTimeMillis();
}
}
};
};
t.start();
logger.info("start the thread");
}
}
WebSocketFacade - receive the websocket connections
@WebSocketHandlerService(path = "/",broadcaster = SimpleBroadcaster.class)
public class WebSocketFacade extends WebSocketHandlerAdapter{
private final Logger logger = LogManager.getLogger(WebSocketFacade.class);
@Override
public void onOpen(WebSocket webSocket) throws IOException {
logger.info("onOpen()");
String servletPath = webSocket.resource().getRequest().getServletPath();
String pathInfo = webSocket.resource().getRequest().getPathInfo();
String canal = servletPath + pathInfo;
logger.info("onOpen(), canal=" + canal );
// recebe broadcaster a partir do nome assinado
Broadcaster b = GameSubscription.getInstance().getBroadCast(canal);
// adiciona a conexao como um assinante
// TODO verificar se eh um nome valido
b.addAtmosphereResource(webSocket.resource());
}
}
poc.js - the javascript implementation
$(document).ready(function() {
console.debug('start: setup');
var socket = $.atmosphere;
var status = $('#status');
var canal1 = $('#button_canal1');
var canal2 = $('#button_canal2');
var inputDados = $('#input_dados');
var buttonDados = $('#button_dados');
canal1.click(function() {
console.debug('assinar canal 1');
subscribe('1');
});
canal2.click(function() {
console.debug('assinar canal 2');
subscribe('2');
});
buttonDados.click(function() {
console.debug('dados=' + inputDados.val());
});
console.debug('end: setup');
});
function subscribe(canal) {
console.debug('subscribe : canal = ' + canal );
var request = {
url : document.location.toString() + 'canal/' + canal,
contentType : "application/json",
logLevel : 'debug',
transport : 'websocket',
trackMessageLength : true,
fallbackTransport : 'long-polling'
};
request.onOpen = function(response) {
console.debug('onOpen()');
$('#status').text('connection open');
};
request.onMessage = function(response) {
console.debug('onMessage()');
var message = response.responseBody;
console.debug('onMessage(), message = ' + message );
try {
var json = jQuery.parseJSON(message);
} catch (e) {
console.log('invalid JSON: ', message);
return;
}
$('#content-' + canal).html(json.text);
};
request.onError = function(response) {
console.debug('onError()');
$('#status').text('error');
};
$.atmosphere.subscribe(request);
console.debug( request );
}
Server side log
0 [localhost-startStop-1] INFO com.vacavitoria.atmosphere.poc.PublishServerState - init()
7 [Thread-2] INFO com.vacavitoria.atmosphere.poc.PublishServerState - cria os canais
8 [Thread-2] INFO com.vacavitoria.atmosphere.poc.PublishServerState - adiciona a lista
13 [localhost-startStop-1] INFO com.vacavitoria.atmosphere.poc.PublishServerState - start the thread
Sep 01, 2014 12:50:22 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Sep 01, 2014 12:50:22 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Sep 01, 2014 12:50:22 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 3739 ms
5011 [Thread-2] INFO com.vacavitoria.atmosphere.poc.PublishServerState - broadcasting messages, sent 230 messages.
5516 [http-bio-8080-exec-5] INFO com.vacavitoria.atmosphere.poc.WebSocketFacade - onOpen()
5517 [http-bio-8080-exec-5] INFO com.vacavitoria.atmosphere.poc.WebSocketFacade - onOpen(), canal=/canal/1
10027 [Thread-2] INFO com.vacavitoria.atmosphere.poc.PublishServerState - broadcasting messages, sent 228 messages.
15059 [Thread-2] INFO com.vacavitoria.atmosphere.poc.PublishServerState - broadcasting messages, sent 225 messages.
16082 [http-bio-8080-exec-6] INFO com.vacavitoria.atmosphere.poc.WebSocketFacade - onOpen()
16087 [http-bio-8080-exec-6] INFO com.vacavitoria.atmosphere.poc.WebSocketFacade - onOpen(), canal=/canal/2
20078 [Thread-2] INFO com.vacavitoria.atmosphere.poc.PublishServerState - broadcasting messages, sent 220 messages.
25085 [Thread-2] INFO com.vacavitoria.atmosphere.poc.PublishServerState - broadcasting messages, sent 222 messages.
Client side log
start: setup poc.js:3
end: setup poc.js:28
assinar canal 1 poc.js:15
subscribe : canal = 1 poc.js:34
Invoking executeWebSocket jquery.atmosphere.js:2980
Using URL: ws://localhost:8080/atmosphere-poc/canal/1?X-Atmosphere-tracking-id=0&X-Atmosphere-Framework=2.2.3-jquery&X-Atmosphere-Transport=websocket&X-Atmosphere-TrackMessageSize=true&Content-Type=application/json&X-atmo-protocol=true jquery.atmosphere.js:2980
Object {url: "http://localhost:8080/atmosphere-poc/canal/1", contentType: "application/json", logLevel: "debug", transport: "websocket", trackMessageLength: true…} poc.js:74
Websocket successfully opened jquery.atmosphere.js:2980
onOpen() poc.js:47
assinar canal 2 poc.js:20
subscribe : canal = 2 poc.js:34
Invoking executeWebSocket jquery.atmosphere.js:2980
Using URL: ws://localhost:8080/atmosphere-poc/canal/2?X-Atmosphere-tracking-id=0&X-Atmosphere-Framework=2.2.3-jquery&X-Atmosphere-Transport=websocket&X-Atmosphere-TrackMessageSize=true&Content-Type=application/json&X-atmo-protocol=true jquery.atmosphere.js:2980
Object {url: "http://localhost:8080/atmosphere-poc/canal/2", contentType: "application/json", logLevel: "debug", transport: "websocket", trackMessageLength: true…} poc.js:74
Websocket successfully opened jquery.atmosphere.js:2980
onOpen()
回答1:
Using the response from the question : Atmosphere responses, broadcasts do not call javascript onMessage handler, I was able to solve the problem !! just removed the trackMessageLength : true from the request and was able to see the messages at the client !!
来源：https://stackoverflow.com/questions/25598745/not-able-to-get-broadcast-on-websockethandleradapter