comet | 易学教程

GWT [WARN] 404 - GET /birgit.chat.Chat.nocache.js comet

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问题 i can't get a comet chat example to run. i get this error [WARN] 404 - GET /birgit.chat.Chat.nocache.js (127.0.0.1) 1413 bytes this is how my web.xml looks like <servlet> <servlet-name>chatComet</servlet-name> <servlet-class>net.zschech.gwt.comet.server.CometServlet</servlet-class> </servlet> <servlet> <servlet-name>chatServiceImpl</servlet-name> <servlet-class>birgit.chat.server.ChatServiceImpl</servlet-class> </servlet> <servlet-mapping> <servlet-name>chatServiceImpl</servlet-name> <url

Android, Cometd : Cometd sending alternate messages

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问题 I am working on an Android application in which I am implementing Chat functionality. The chat is quite fast given the usage of Cometd, but for some reason, Cometd is sending alternate messages. If it sends message-1, it doesn't send message-2, then 3 is sent, so on and so-forth. This is a very strange behaviour and hard to isolate the problem as there is no error. I added system logs to check if the onClick method is getting called and the loop inside which sends the message. Also, I added a

Why setting a client-side timeout when using long polling?

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问题 In almost every long polling examples I see, there is something like a timeout of 30 seconds client-side. What is the precise reason for this? 回答1: Some routers, proxies or whatever device there is in the middle might decide to drop TCP/IP connections being idle for extensive period of time. Also refreshing connection once in a while makes sure you'll discover server failure quicker. 来源： https://stackoverflow.com/questions/14903223/why-setting-a-client-side-timeout-when-using-long-polling

Pushing messages to clients from a server-side application?

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问题 I have a javascript-based client that is currently polling a .NET web service for new content. While polling works...I'm not happy with this approach because I'm using system resources and creating overhead when there aren't any changes to receive. My question is how do I notify my client(s) that there is new content for it to display? I am open to on any additional technologies I would have to implement this solution with. 回答1: First of all, polling is the way to go. You could do it with

How websockets can be faster than a simple HTTP request?

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问题 You still need to send requests from your computer to the website's server and back and forth. How can websockets make it so much faster? 回答1: WebSocket is a extension for HTTP. For low-latency communication Web Sockets are better. Also check this article How can websockets make it so much faster? To establish a WebSocket connection, the client and server upgrade from the HTTP protocol to the WebSocket protocol during their initial handshake, as shown in the following example:- GET /text HTTP

Intel连牙膏也懒得挤：直接玩马甲

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9代酷睿处理器已经登陆桌面平台，不过，仅有三款，而且都是价格不菲的型号。按惯例，Intel将会逐步面向移动平台、入门级桌面等部署更多的款式。联想网站一款名为IdeaPad S530-131WL的笔记本电脑规格页面，处理器一栏赫然写着Core i7-9550U、i5-9250U、i3-9130U，都是新面貌。同时，按照联想的表述，i7-9550U对位i7-8565U，i5-9250U对位i5-8265U，i3-9130U对位i3-8145U，看来性能方面几无差别。后三款是Intel8月份发布的8代酷睿新品，隶属于Whiskey Lake家族。早先的消息称，用于笔记本平台的9代低电压酷睿CPU预计2019年Q2发布，热设计功耗均为15W，每核心配2MB三缓。至于这批Core 9000U处理器是不是10nm的Ice Lake，或者是新曝光的Comet Lake（彗星湖），还不得而知。由于10nm的延期，14nm工艺是优化再优化，阵容实在是有些混乱。原文来自： https://news.mydrivers.com/1/604/604800.htm 本文地址： https://www.linuxprobe.com/intel-comet-lake.html 编辑：任倩倩，审核员：逄增宝来源： oschina 链接： https://my.oschina.net/u/3308739

Realtime server push with Socket IO (or Strophe.js), XMPP and Django

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问题 I have a couple of Android and iOS native mobile application that I wrote which connect directly to an XMPP server that I host. They push and pull realtime data through XMPP. I also use some of the XMPP XEP extensions. For other operations, I have a django application running on the same server which all the mobile applications consume through an HTTP REST interface. I use Celery and Redis for the django side to do some operations asynchronously (like doing heavy batched writes to my db).

What's a simple way to web-ify my command-line daemon?

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问题 Suppose I have a simple daemon type script that I run on my webserver. I run it in a terminal, with gnu screen, so I can keep an eye on it. That works fine (incidentally, I use this trick). But now suppose I'd like to make a web page where I can keep an eye on my script's output. What's the easiest way to do that? Notes: This is mainly for myself and a couple co-hackers so if websockets is the answer and it only works on Chrome or something, that's acceptable. This question is asking

Sending messages to server with Comet long-polling

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问题 What's the best way to send data from client to server? The example code I'm using is from How do I implement basic "Long Polling"? 回答1: Just use XHR to do a POST. One problem is on some browsers you can only have 2 (or some number n) concurrent XHR connections per server. You can work around this by making a queue that lets you post all waiting messages when the current XHR completes, then filling up a new queue until that post completes, and back and forth. 回答2: Sending data to the server

Scaling Microsoft's ASP.NET Reverse AJAX “long poll” codeplex example

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问题 I'm investigating Microsoft's reverse-AJAX sample wherein they use a long timeout in the ScriptManager <asp:ScriptManager ID="ScriptManager1" runat="server" AsyncPostBackTimeout="2147483647"> And a ManualResetEvent to control the wait: private ManualResetEvent messageEvent = new ManualResetEvent(false); public Message DequeueMessage() { // Wait until a new message. messageEvent.WaitOne(); } public void EnqueueMessage(Message message) { lock (messageQueue) { messageQueue.Enqueue(message); //