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想飞��飞 — Wed, 25 Aug 2010 05:55:00 GMT

1.如何动态获取Object中的属性和�?/pre>
var ct:CustomObject=newCustomObject(); 

var xml:XML = describeType(ct);

for each(var accessor in xml..accessor){

  var name:String= accessor.@name;

  var type:String= accessor.@type;

  trace(ct[name]);

}




2. 对象之间的拷�?br />

/**

 * copies a source object to a destination object

 * @param sourceObject the source object

 * @param destinationObject the destination object

 *

 */

public static function copyObject(sourceObject:Object, destinationObject:Object):void

{

    // check if the objects are not null

    if((sourceObject) && (destinationObject)) {

        try

        {

            //retrive information about the source object via XML

            var sourceInfo:XML = describeType(sourceObject);

            var objectProperty:XML;

            var propertyName:String;



            // loop through the properties

            for each(objectProperty in sourceInfo.variable)

            {

                propertyName = objectProperty.@name;

                if(sourceObject[objectProperty.@name] != null)

                {

                    if(destinationObject.hasOwnProperty(objectProperty.@name)) {

                        destinationObject[objectProperty.@name] = sourceObject[objectProperty.@name];

                    }

                }

            }

            //loop through the accessors

            for each(objectProperty in sourceInfo.accessor) {

                if(objectProperty.@access == "readwrite") {

                    propertyName = objectProperty.@name;

                    if(sourceObject[objectProperty.@name] != null)

                    {

                        if(destinationObject.hasOwnProperty(objectProperty.@name)) {

                            destinationObject[objectProperty.@name] = sourceObject[objectProperty.@name];

                        }

                    }

                }

            }

        }

        catch (err:*) {

            ;

        }

    }











想飞���飞 2010-08-25 13:55 发表评论

Flex讉K��BlazeDS/LCDSservice 避免��编码的�Ҏ��

想飞��飞 — Tue, 20 Jul 2010 05:45:00 GMT

�q�篇文章提到的方法挺好的�Q�就是用一个httpservie动态加载一个配�|�文�Ӟ��在配�|�文仉��写好remote service的配�|?
原文请参�?
http://coenraets.org/blog/2009/03/externalizing-service-configuration-using-blazeds-and-lcds/

A typical source of confusion when developers start working with RemoteObject or other BlazeDS/LCDS related classes is where and most importantly *when* the configuration of your services is being read.

The question often arises after an application stops working when you move it to another server. This is one of the most frequently asked questions related to BlazeDS and LCDS, so I figured I would answer it here. There is nothing really new in this post, but hopefully this will be a good point of reference.

When you create a new BlazeDS or LCDS project in Flex Builder, you are typically told to select J2EE as the “Application Server Type” and then check “use remote object access service”. This adds a compiler argument pointing to the location of your services-config.xml. If you check the Flex Compiler properties of your Flex Builder project, you’ll see something like this:

-services “c:\blazeds\tomcat\webapps\samples\WEB-INF\flex\services-config.xml”

When you then compile your application, the required values of services-config.xml are baked into the SWF. In other words, services-config.xml is read at compile time and not at runtime as you may have thought intuitively. To abstract things a little bit, you can use tokens such as {server.name}, {server.port}, and {context.root} in services-config.xml. However, {context.root} is still substituted at compile time, while {server.name} and {server.port} are replaced at runtime using the server name and port number of the server the SWF was loaded from (which is why you can’t use these tokens for AIR applications).

Fortunately, the Flex SDK provides an API that allows you to configure your channels at runtime and entirely externalize your services configuration from your code (you definitely don’t want to recompile your application when you move it to another server). At a high level, it works like this:

var channelSet:ChannelSet = new ChannelSet();
var channel:AMFChannel = new AMFChannel("my-amf", "http://localhost:8400/lcds-samples/messagebroker/amf");
channelSet.addChannel(channel);
remoteObject.channelSet = channelSet;

This is still not what we want because the endpoint URL is still hardcoded in the application. At least in this case it’s obvious that it is. So, the last step is to pass that endpoint URL value at runtime. There are a number of ways you can pass values to a SWF at runtime (flashvars, page parameters, etc). The approach I usually use is to read a configuration file using HTTPService at application startup. That configuration file includes (among other things) the information I need to programmatically create my channel set at runtime. Here is a basic implementation:

xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
    applicationComplete="configSrv.send()">

    <mx:Script>
    [CDATA[

    import mx.controls.Alert;
    import mx.messaging.channels.AMFChannel;
    import mx.messaging.ChannelSet;
    import mx.rpc.events.ResultEvent;

    private var channelSet:ChannelSet;

    private function configResultHandler(event:ResultEvent):void
    {
        var xml:XML = event.result as XML;
        var amfEndpoint:String = "" + xml..channel.(@id=="amf").@endpoint;
        if (amfEndpoint == "")
        {
            Alert.show("amf channel not configured", "Error");
        }
        else
        {
            channelSet = new ChannelSet();
            var channel:AMFChannel = new AMFChannel("my-amf", amfEndpoint);
            channelSet.addChannel(channel);
            ro.channelSet = channelSet;
            ro.getProducts();
        }
    }

    ]]>
    mx:Script>

    <mx:HTTPService id="configSrv" url="config.xml" resultFormat="e4x" result="configResultHandler(event)"/>

    <mx:RemoteObject id="ro" destination="product"/>

    <mx:DataGrid dataProvider="{ro.getProducts.lastResult}" width="100%" height="100%"/>

mx:Application>

The configuration file looks like this:

xml version="1.0" encoding="utf-8"?>
<config>
    <channels>
        <channel id="amf" endpoint="http://localhost:8400/lcds-samples/messagebroker/amf"/>
    channels>
config>

NOTE: With that type of runtime configuration in place, you can create plain Flex Builder projects (you can select None as the application server type).

This particular example is not extremely flexible. It assumes I will always work with an AMF channel and therefore the only thing my application needs to know at runtime is the AMF channel endpoint URL. For RemoteObject that’s a fairly safe bet, however for messaging-related classes (Producer and Consumer), you may also want to externalize the type of channel you use (AMF Polling, long polling, streaming, RTMP, etc.). Before you start creating that kind of dynamic configuration system, you may want to take a look at the Flex ActionScript framework that does that very well.

想飞��飞 2010-07-20 13:45 发表评论

想飞��飞 — Mon, 01 Mar 2010 09:16:00 GMT

1.Channel和Endpoint的定�?/strong>
Channels are client-side objects that encapsulate the connection behavior between Flex components and the BlazeDS server. Channels communicate with corresponding endpoints on the BlazeDS server. You configure the properties of a channel and its corresponding endpoint in the services-config.xml file.

2.从数据格式上分，Channels分�ؓAMF Channel和HTTP Channel�Q�区别在�?/strong>�Q?br /> The difference between AMF and HTTP channels is that AMF channels transport data in the binary AMF format and HTTP channels transport data in AMFX, the text-based XML representation of AMF.

3.从客��L��与服务端的交互方式上分，Channels主要分�ؓ�Q?/strong>
Simple channels and endpoints 包括�Q?br />    (1) Non-polling channels
   (2) Polling channels
   (3) Long polling channels

Streaming channels
   (1) Streaming channels

3.关于 Non-polling,Polling,Long polling和steaming的一些解�?/strong>
http://www.qgy18.com/2008/08/webim-design-transport/
http://newteevee.com/2009/10/04/adobe-to-finally-support-http-streaming/

1.短轮�?polling)�Q�核心思想是客��L��定时��L��务器取消息。�ؓ了实现即时效果，轮询的间隔必��设计得��_��短，另外��Z��操作的流畅，需要��用Ajax来发送请求。本人的QGYWebIM��是采用的此�Ҏ��。这�U�方案的优点是：后端�E�序�~�写比较�Ҏ��Q�发送完响应信息马上断开�q�接�Q�不会占用太多服务器资源。缺�Ҏ��一般情况下�Q�频�J�的��h��中有大半是无用，�q�些冗余��h��无�Ş中浪费了带宽和服务器资源。我们可以通过判断用户的活跃程度来决策��h��服务器的间隔�Q�我�?1的一个帖子提到过�q�种�Ҏ��Q�但是间隔一旦长了，消息的传送就有�g�Ӟ��q�背了即时聊天的初衷了�?br />
2.长轮�?long-polling)�Q�基本原理是客户端向服务器发送请求，服务器接到请求后hold住连接，直到有新消息才返回响应信息�ƈ关闭�q�接�Q�连接被断开期间用户的新信息会被服务器缓存�v来。客��L��处理完响应信息后再向服务器发送新的请求。这�U�做法的优势是如果用户一直没新消息，客户端不会频�J�的轮询��L��务器取消息，节省了流量，但是服务器维持长�q�接是很消耗资源的。具体实现�v来，前端�q�边基本不需要什么改动，依然是用Ajax轮询取信息，后端需要在没有新消息时处理一下�?br />
3.长连�?streaming)�Q�其实很早以前就有�h使用�q�种技术来实现聊天室的通讯�Q�HTTP1.1开始支持。以前在��面中嵌入一个iframe�Q�iframe里放一个��用长�q�接��面�Q�服务器有新消息��׃��及时的在iframe里反映出来，再依靠客��L��的脚本解析出来就OK了。这样做一个比较严重的问题是：使用 iframe��h��长连接时�Q�无论是IE�q�是firefox都会认�ؓ��面没有加蝲完而显�C��度条�Q�很隄��。不�q�这个问题是可以解决的。firefox支持了Streaming Ajax�Q�在readyState�?的时候就能接受数据，所以问题不大；IE则只能在readyState�?�Q�即�q�接断开时才能得到返回倹{��但是伟大的Google工程师��用了一个hack成功的解决了�q�个问题�Q��用一个被�U�Cؓ“htmlfile”的ActiveX�Q�把iframe攑֜��q�个ActiveX里就OK了�?br />
无疑�Q��用长�q�接对于用户来说是最好的�Ҏ��Q�用户体验最好（消息能及时的到达�Q�、占用用户带宽最��（不会发送无用的��h��Q�，但是会增加服务器的开销�Q�长轮询是折中方案，Facebook IM ��是采用�q�种�Ҏ��Q�不�q�做了一�Ҏ��动：客户端发��L��每个�q�接服务器都hold10S�Q�这10S中新消息会源源不断的�q�回�l�客��L��Q?0s后连接关闭，客户端发起下一个连接。这样做是因为Facebook的用户会不断的打开、关闭新��面�Q�如果每个页面都建立一个永久的长连接，会阻塞浏览器其他��h��Q�服务器也会吃不消的�Q�短轮询因�ؓ实现��h��单，适用于小型应用�?br />

想飞��飞 2010-03-01 17:16 发表评论

使用Flex和Grails快速的创徏Hello World

想飞��飞 — Wed, 16 Jul 2008 14:35:00 GMT
     摘要: 使用Flex和Grails快速的创徏Hello World   阅读全文

想飞��飞 2008-07-16 22:35 发表评论

想飞��飞 — Tue, 08 Jul 2008 15:24:00 GMT
     摘要: 快速搭建Flex和Grails的集成开发环�?nbsp; 阅读全文

想飞��飞 2008-07-08 23:24 发表评论

配置FlexUnit 和Ant

想飞��飞 — Fri, 27 Jun 2008 07:05:00 GMT
     摘要: 配置FlexUnit 和Ant  阅读全文

想飞��飞 2008-06-27 15:05 发表评论

初识Flex Data Services(FDS)

想飞��飞 — Thu, 06 Dec 2007 09:54:00 GMT
     摘要: FDS全称Flex Data Services(现在Adobe��其改名为LiveCycle Data Services),是运行在服务器端的java�E�序.它能够运行在大部分的java应用服务器上,包括JRun, JBoss, WebLogic, WebSphere, Oracle10g, and Tomcat�{?使用FDS,能够帮助你创建实时的,数据驱动的Flex Application.  阅读全文

想飞��飞 2007-12-06 17:54 发表评论

想飞��飞 — Mon, 03 Dec 2007 07:32:00 GMT
嘿嘿,工作需�?开始搞Flex�?br /> 今天装上了Flex SDK �?Flex Builder2
有志同道合的兄弟多多帮助!

想飞��飞 2007-12-03 15:32 发表评论

亚洲男人的天堂在线,亚洲无码一区二区三区,亚洲精品无码中文久久字幕

Flex讉K��BlazeDS/LCDSservice 避免���编码的�Ҏ��

使用Flex和Grails快速的创徏Hello World

配置FlexUnit 和Ant

初识Flex Data Services(FDS)

Flex讉K��BlazeDS/LCDSservice 避免��编码的�Ҏ��