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Pushlet 已經存在了好一段日子, 都是因為 AJAX 才再有人留意到他們的存在. 早在 2000 年 JavaWorld 提及到 Pushlet 的文章 http://www.javaworld.com/jw-03-2000/jw-03-pushlet.html 有興趣的我推介這網頁, 當中提及到不同的 HTTP Streaming 的方法 http://ajaxpatterns.org/HTTP_Streaming 還有, 我想問一下: "跨越浏览器的DHTML:Pushlet需要使用能工作在任何平台、所有浏览器版本的DHTML库。" 這個好像是所有不同類型的 AJAX 都遇到的問題呢. 我在會, 會不會和其他的 HTTP Streaming/Reverse AJAX 的方法作比較會合適一點? 前部份的原文: http://www.pushlets.com/doc/whitepaper-toc.html (BTW, "垄断者" 這游戲, 是不是就是 "大富翁" 呢? "Risk" 應該是"戰國風雲" 呢, 翻譯文章時要留意的細節)
很早的技术了,若用在一般的服务器上开销会很大,很浪费资源。一般这样做的都是自己开发web server。不过现在jetty已经支持了,她的Continuation结合SelectChannelConnector正解决此问题,不知道其他服务器什么时候会支持...
感谢tcmak同学的帮助,翻译的如此写意! 垄断者-->大富翁 Risk-->戰國風雲..佩服。希望以后多多纠错哦!
这个始终不是解决问题的好办法,能不能用消息结合dhtml达到服务器主动发送信息呢?
to fjzuser同学: >>这个始终不是解决问题的好办法,能不能用消息结合dhtml达到服务器主动发送信息呢? Pushlet支持poll、push、pull、AJAX请求等方式,而且并不是采用无限循环,而是使用wait/notify的通知模式。相对request/response的模式来讲,其弱点便是需要建立长连接,当用户数过多时,服务器网络/内存负载都会大大增加。 如果采用NIO技术会提升一定的server端处理能力。 而dwr2.0的reverse ajax也只能通过client poll来模拟comet 连接。这虽然减少了server负担,但是这并不是push而是poll。
使用Jetty6的Continuation方法可以比较有效的减少对server端资源的消耗: 首先Jetty挂起请求时,request handler调用continuation.getEvent(timeoutMS),将抛出RetryReqeuest runtime异常,Jetty捕捉此异常并处理之:将此事件放置到timeout对列,并将此线程回收; 当请求过期或者其它线程调用continuation.resume(event)方法企图继续使用此请求,此时Jetty将调用continuation.getEvent(timeoutMS)方法,它将返回事件或者表示事件已经过期的null,request handler会根据返回的事件产生相应的response。 这样便依照请求的利用情况有效的分配server资源(socket、线程),减少浪费在挂起线程上的长连接。
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
本人用pushlet进行英文聊天就没有问题,但是用中文聊天的时候,就出现当前会话session被removed掉,push不了信息。 请问下是什么原因?多谢!
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