Think in Pushlet

用户评论列表

#1 评论作者: tcmak 发表时间: 2007-01-16 11:54 上午

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)

#2 评论作者: crazylb 发表时间: 2007-01-16 04:08 下午

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...

#3 评论作者: cleverpig 发表时间: 2007-01-16 06:12 下午

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！

#4 评论作者: fjzuser 发表时间: 2007-01-21 09:25 上午

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？

#5 评论作者: cleverpig 发表时间: 2007-01-22 10:19 上午

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。

#6 评论作者: cleverpig 发表时间: 2007-01-22 10:42 上午

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。

#7 评论作者: Anson 发表时间: 2007-10-17 04:34 下午

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！

#8 评论作者: Anson 发表时间: 2007-10-17 04:34 下午

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！

#9 评论作者: Anson 发表时间: 2007-10-17 04:34 下午

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！

#10 评论作者: Anson 发表时间: 2007-10-17 04:34 下午

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！

#11 评论作者: Anson 发表时间: 2007-10-17 04:34 下午

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！

#12 评论作者: Anson 发表时间: 2007-10-17 04:34 下午

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！

#13 评论作者: Anson 发表时间: 2007-10-17 04:34 下午

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！

#14 评论作者: Anson 发表时间: 2007-10-17 04:35 下午

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！

#15 评论作者: Anson 发表时间: 2007-10-17 04:35 下午

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！

#16 评论作者: Anson 发表时间: 2007-10-17 04:35 下午

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！

#17 评论作者: Anson 发表时间: 2007-10-17 04:36 下午

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！

#18 评论作者: Anson 发表时间: 2007-10-17 04:37 下午

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！

#19 评论作者: Anson 发表时间: 2007-10-17 04:49 下午

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！

#20 评论作者: yangkee 发表时间: 2008-04-10 06:00 下午

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#22 评论作者: yangkee 发表时间: 2008-04-10 06:05 下午

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#23 评论作者: 804e 发表时间: 2008-05-18 10:09 下午

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#24 评论作者: 804e 发表时间: 2008-05-18 10:09 下午

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