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Pushlet白皮书中英文对照周健zhoujianqinfen@yahoo.com.cn昆明理工大学2010-1-15最近在学习pushlet的时候，深感中文文档缺乏。我在参照pushlet官网上的白皮书，以及搜索网上其他先驱者的翻译资料，还加上自己的一些翻译特整理而成，由于水平有限，不正确之处，请大家见谅。本文中英文对照，方便大家学习参考，制作纯属个人学习与交流之用，大家可以自由传载，不得用于商业用途。1．介绍(Introduction)......................................................................................................................32．动机(Motivation)........................................................................................................................43．通知解决(NotificationSolutions)...............................................................................................53.1轮询(Polling).......................................................................................................................63.2服务器端回调(Server-sidecallbacks).................................................................................63.3消息(MessagingMOM).....................................................................................................63.4讨论(Discussion).................................................................................................................74．pushlet基础(PushletBasics)......................................................................................................84.1HTTP流(HTTPStreaming)....................................................................................................94.2示例1(Example1)...............................................................................................................94.3示例2(Example2).............................................................................................................105．不仅Java-动态超文本标记语言(NotjustJava-DynamicHTML).........................................146．框架设计(DesignoftheFramework).......................................................................................166.1.服务器端类设计Server-sideclassdesign.....................................................................186.1.1.场景：事件订阅(Scenario:EventSubscription).................................................206.1.2.场景：发送和派分事件Scenario:SendingandDispatchingEvents....................226.2.客户端框架Client-sideframework.................................................................................247．应用(Applications)....................................................................................................................277.1.监控Monitoring.............................................................................................................287.2.游戏Gaming...................................................................................................................287.3.分布式模型-视图-控制器DistributedModelViewController(MVC)...........................287.4.Web表现层WebPresentations......................................................................................297.5.用户辅助UserAssistance..............................................................................................307.6.社区工具CommunityTools............................................................................................318．倾向(Liabilities).........................................................................................................................318.1.优点Advantages.............................................................................................................318.2.缺点Disadvantages.........................................................................................................329．更进一步的工作(FurtherWork)..............................................................................................339.1.额外的客户端接收协议：例如TCP和UDP（Additionalclientreceiver-protocolssuchasTCPandUDP）.......................................................................................................................339.2.额外的服务器端发送协议additionalclientsender-protocols.....................................349.3.主题状态subjectstate...................................................................................................349.4.多用户multi-user...........................................................................................................3510．参考(References)....................................................................................................................351．介绍(Introduction)Server-sidenotificationtobrowser-clientsisoftenimplementedusingappletswithRMI,CORBAorcustomTCP/IPmessaging.Thesetechniquesareoftencomplextoimplement,havefirewallrestrictions,andrequireadditionalserverdevelopment/maintenance.Alsoitishardtointegratethestateoftheclient-appletwiththebrowser'spage-contentotherthanrefreshingthepageordoingallcontent-layoutwithintheapplet.Server端向浏览器client发送通知这种通讯模式通常采用RMI、CORBA或者自定义TCP/IP信息来实现。这些技术往往由于复杂而难以实现：存在防火墙限制（因为需要打开非HTTP的通讯端口）、需要额外的server开发和维护。并且除了刷新整个页面或者完全采用applet展示内容之外，很难找到别的方法将client端applet的状态和浏览器的页面内容集成在一起。Pushletsareaservlet-basedmechanismwheredataispusheddirectlyfromserver-sideJavaobjectsto(Dynamic)HTMLpageswithinaclient-browserwithoutusingJavaappletsorplug-ins.Thisallowsawebpagetobeperiodicallyupdatedbytheserver.ThebrowserclientusesJavaScr