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</mx:Panel>
</mx:Application>
RegularApplication.mxml implements the interface 
IGreeting
from Example 7-12. Un-
der the SSCD scenario, a portlet will see the definition of the 
IGreeting
loaded by the
portal. Accordingly, the portal will be able to cast the portlet to 
IGreeting
, as shown
in Example 7-35 (you may compare 
swfLoader.content
with 
moduleLoader.child
).
Example 7-35. Interface-based scripting of the portlet loaded into the child domain
public function modifyValue():void {
var systemManager:SystemManager = SystemManager(swfLoader.content);
loadedApplication.setGreeting(" accessed from outside");
}
Similarly to the way you arranged event-based communication with the modules, this
portlet listens to and communicates with the loading application via 
loaderInfo.share
dEvents
(Example 7-36).
Example 7-36. Event-based portlet-portal communication via sharedEvents
private function onCreationComplete():void {
// Subscribe to command from the application
swfBridge.addEventListener("command", onCommand,false,0,true );
// Notify the application that creation has completed
var evt:RemoteEvent = new RemoteEvent("creationComplete");
evt.data = ". Loaded application reported createComplete!";
swfBridge.dispatchEvent(evt);
}
Make sure to deploy RegularApplication.mxml into an entirely dedicated BlazeDS or
LCDS context. This example creates a combined Flex/Java LCDS/Web Tools Platform
(WTP) project called RemoteSite, as shown in Figure 7-14. (Please see the Adobe doc-
umentation on how to create a combined Flex/Java project with LiveCycle Data Serv-
ices and WTP.) Having a dedicated Flex/JEE project enables you to define destinations
of the portlet without affecting a portal or another portlet application.
To the RemoteSite/WebContent/WEB-INF/flex/proxy-config.xml file of this project, you
need to add the destination 
GoogleNews
, as shown in Example 7-37.
Example 7-37. GoogleNews proxy destination
<destination id="GoogleNews">
<properties>
<url>http://news.google.com/?output=rss</url>
</properties>
</destination>
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Example 7-38 presents the class 
GoogleNews
, a descendant of 
DataGrid
that encapsulates
HTTPService
and displays Google News headlines to the user. When you run the portlet,
it should look like Figure 7-15.
Example 7-38. GoogleNews DataGrid
<?xml version="1.0" encoding="utf-8"?>
<!-- GoogleNews.mxml -->
<mx:DataGrid  xmlns:mx="http://www.adobe.com/2006/mxml"
creationComplete="news.send()"
dataProvider="{news.lastResult.channel.item}"
variableRowHeight="true">
<mx:columns>
<mx:DataGridColumn headerText="Date"  dataField="pubDate" />
</mx:columns>
<mx:HTTPService id="news" useProxy="true"  destination="GoogleNews"
resultFormat="e4x" fault="onFault(event)" />
<mx:Script>
<![CDATA[
import mx.rpc.events.*;
private function onFault(event:FaultEvent):void {
"\n" + "Fault code:" + event.fault.faultCode + "\n" +
"Detail:" + event.fault.faultDetail, "News feed failure"
);
}
]]>
</mx:Script>
</mx:DataGrid>
Figure 7-14. Applications from RemoteSite will be accessed via domain 127.0.0.1
368 | | Chapter 7: Modules, Libraries, Applications, and Portals
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Figure 7-15. Sample portlet of RegularApplication
Finally, consider the sample portal, SameSandboxChildDomainDemo.mxml, in Exam-
ple 7-39. We suggest you create a separate combined Flex/Java/WTP Eclipse project,
as shown in Figure 7-16. To illustrate the cross-domain specifics, you can run the portal
from http://localhost while loading the portlet from the different domain, http://
127.0.0.1.
Example 7-39. SameSandboxChildDomainDemo application
<?xml version="1.0"?>
<!-- SameSandboxChildDomainDemo.mxml -->
<mx:Script>
<![CDATA[
import events.RemoteEvent;
import mx.managers.SystemManager;
private const APP_URL:String =
"http://127.0.0.1:8080/RemoteSite/RegularApplication.swf";
public function modifyValue():void {
// Casting to SystemManager and IGreeting is possible
loadedApplication.setGreeting(" accessed from outside");
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}
private function loadApplication():void {
swfLoader.addEventListener("complete", onLoadComplete);
swfLoader.source = APP_URL;
}
[Bindable] private var applicationLoaded:Boolean;
private var sharedEventDispatcher:IEventDispatcher;
private function onLoadComplete(event:Event):void {
applicationLoaded = true;
sharedEventDispatcher.addEventListener(
"creationComplete", onLoadedApplicationCreated
);
}
[Bindable] private var reply:String="";
// Casting to RemoteEvent is possible
reply = event.data as String;
var remoteEvent:RemoteEvent = new RemoteEvent("command");
remoteEvent.data = ". Two-way communication works!";
sharedEventDispatcher.dispatchEvent(remoteEvent);
}
]]>
</mx:Script>
<mx:HBox>
<mx:Button label="Load Application" click="loadApplication()" />
<mx:Button label="Modify Value" click="modifyValue();"
enabled="{applicationLoaded}"/>
</mx:HBox>
<mx:Panel title="Yahoo News{reply}" width="100%" height="50%"
id="panel">
<local:YahooNews width="100%" height="100%"/>
</mx:Panel>
<mx:SWFLoader id="swfLoader" width="100%" height="50%"
trustContent="true"/>
</mx:Application>
Notice the setting 
trustContent="true"
of the 
swfLoader
. This guarantees that despite
different web domains of the portal and portlet, class loading happens into the same
sandbox and, by default, to the child application domain.
That said, you should stick to the golden Flash security rule that the .swf (of the portal)
can access a resource (portlet) on the different web domain only when such domain
holds a cross-domain policy file that expresses trust to the domain of the .swf. So make
sure your root web application contains the file shown in Example 7-40.
370 | | Chapter 7: Modules, Libraries, Applications, and Portals
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Figure 7-16. ApplicationLoaders project
Example 7-40. Policy file cross-domain.xml
<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy
SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
<allow-access-from domain="*"/>
</cross-domain-policy>
Make sure that you do not use this indiscriminating policy file in production. For more
information on secure cross-domain communication in Flash Player, see http://www
.adobe.com/devnet/flashplayer/articles/secure_swf_apps.html.
SameSandboxChildDomainDemo.mxml has its own news grid—it displays Yahoo!
News. (The code of 
YahooNews
is identical to 
GoogleNews
from Example 7-37, except
that it uses the different destination, as presented in Example 7-41. You should add
this destination to ApplicationLoaders/WebContent/WEB-INF/flex/proxy-config.xml.)
Example 7-41. Proxy destination for Yahoo! News
<destination id="YahooNews">
<properties>
<url>http://rss.news.yahoo.com/rss/topstories</url>
</properties>
</destination>
When you run the application and click OK on the pop up called “Loaded application
talks back,” it will look like Figure 7-17.
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Loading Portlets for Multiversioning
What about the scenarios that support multiversioning? The default loading scenario
from different web domains is Different Sandbox Different Domain. Example 7-42’s
sample portal, DifferentSandboxDifferentDomainDemo, not only illustrates this sce-
nario, it will also help you to understand the Same Sandbox Different Domain scenario.
When you examine the code, notice the seemingly redundant reference to the class
PopUpManager
. It’s not accidental. You always have to link the 
PopUpManager
class to your
portal to allow pop-up controls in the portlets. That’s how Adobe implemented it, and
this requirement does not seem like too much to ask for.
Next, note that casting across sibling domains is out of reach. Look at the body of the
modifyValue()
method. You can’t cast the 
loadedApplication
either to 
IGreeting
or to 
mx.core.Application
. Instead, the example declares it as 
flash.dis
play.DisplayObject
. For similar reasons, the declaration of the 
onLoadedApplication
Created()
method downcasts the type of object to 
flash.events.Event
. If you instead
try to declare 
loadedApplication
as 
Application
, you will receive this runtime error:
Figure 7-17. SameSandboxChildDomainDemo
372 | | Chapter 7: Modules, Libraries, Applications, and Portals
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TypeError: Error #1034: Type Coercion failed: cannot convert
TrustfulApplication@c8f20a1 to mx.core.Application.
Now, examine the function 
onLoadComplete()
. To obtain the reference to the
sharedEventDispatcher
, the function uses the expression 
swfLoader.swfBridge
instead
of 
swfLoader.content.loaderInfo.sharedEvents
.
Example 7-42. DifferentSandboxDifferentDomainDemo
<?xml version="1.0"?>
<!-- DifferentSandboxDifferentDomainDemo.mxml -->
<mx:Script>
<![CDATA[
import events.RemoteEvent;
import mx.managers.PopUpManager; PopUpManager;
import mx.managers.SystemManager;
private const APP_URL:String =
"http://127.0.0.1:8080/RemoteSite/TrustfulApplication.swf";
public function modifyValue():void {
loadedApplication["setGreeting"]("loaded from outside");
}
private function loadApplication():void {
swfLoader.addEventListener("complete", onLoadComplete);
swfLoader.source=APP_URL;
}
[Bindable] private var applicationLoaded:Boolean;
private var sharedEventDispatcher:IEventDispatcher;
private function onLoadComplete(event:Event):void {
swfLoader.removeEventListener("complete", onLoadComplete);
applicationLoaded = true;
// Since swfLoader.content.loaderInfo.sharedEvents=null,
// use swfLoader.swfBridge
sharedEventDispatcher = swfLoader.swfBridge;
sharedEventDispatcher.addEventListener("creationComplete",
onLoadedApplicationCreated);
}
[Bindable] private var reply:String="";
// We cannot cast RemoteEvent across Application Domains
if (event.hasOwnProperty("data")) {
reply = event["data"];
}
var remoteEvent:RemoteEvent = new RemoteEvent("command");
remoteEvent.data = ". Two-way communication works!";
sharedEventDispatcher.dispatchEvent(remoteEvent);
}
]]>
Sibling Domains and Multiversioning g | 373
</mx:Script>
<mx:HBox>
<mx:Button label="Load Application" click="loadApplication()" />
<mx:Button label="Modify Value" click="modifyValue();"
enabled="{applicationLoaded}"/>
</mx:HBox>
<local:YahooNews width="100%" height="100%"/>
</mx:Panel>
<mx:SWFLoader id="swfLoader" width="100%" height="50%"/>
</mx:Application>
The same concepts hold true for the Same Sandbox Different Domain scenario as well.
Specific to the cross-domain scenario, however, is that DifferentSandBoxDifferentDo-
mainDemo loads TrustfulApplication.swf (Example 7-43), which extends the
RegularApplication
merely to express cross-scripting trust to the web domain of the
portal via 
Security.allowDomain("*")
.
Example 7-43. TrustfulApplication
<?xml version="1.0"?>
<!-- TrustfulApplication.mxml-->
<RegularApplication xmlns:mx="http://www.adobe.com/2006/mxml" xmlns="*"
preinitialize="onPreinitialize(event)">
<mx:Script>
<![CDATA[
private function onPreinitialize(event:Event):void {
}
]]>
</mx:Script>
</RegularApplication>
The body of the function 
modifyValue()
takes advantage of these cross-scripting
permissions, referring to 
swfLoader.content
. Had you loaded the untrusted
RemoteApplication.swf, you would have received the error shown in Example 7-44.
Example 7-44. Example of security error
SecurityError: Error #2121: Security sandbox violation: Loader.content:
cannot access http://127.0.0.1:8080/RemoteSite/RegularApplication.swf.
This may be worked around by calling Security.allowDomain.
at flash.display::Loader/get content()
at mx.controls::SWFLoader/get content
This is the only coding specific to the DSDD scenario versus SSDD. Of course, in the
case of SSDD, the 
loadingForCompatibility
property of the 
swfLoader
would be set to
true, and you would specify 
trustContent="true"
to offset the domain difference.
374 | | Chapter 7: Modules, Libraries, Applications, and Portals
The successfully running DSDD application was previously presented in Figure 7-16,
and Figure 7-18 illustrates a problem in the SSDD scenario: the Google News panel is
showing up empty. As it turns out, in the case of SSDD, you need to change your
architecture and preload Flex messaging, RPC, and Data Management Services–related
classes in the application domain that will parent the domain of the portal.
Figure 7-18. Same Sandbox Different Domain: Flex Messaging does not work without bootstrap
loading of the messaging classes
Bootstrap Class Loading
The previous section mentioned that casting is out of reach across sibling domains.
That constraint is not as tight, however, as you might think. Remember how you cast
loaded modules and applications to the 
IGreeting
interface earlier in the chapter? You
did not cast the 
IGreeting
of the child to the 
IGreeting
of the parent, because the
IGreeting
of the child did not exist. A child is always reusing classes loaded in the
parental chain. So, two sibling domains can cast classes if they share a common parent
that preloads these classes. In particular, such bootstrap class loading, as Adobe calls
it, is required to maintain a common definition of the following classes from the 
mx.mes
saging.messages
package per security domain:
Sibling Domains and Multiversioning g | 375
ConfigMap
AcknowledgeMessage
AcknowledgeMessageExt
AsyncMessage
AsyncMessageExt
CommandMessage
CommandMessageExt
ErrorMessage
HTTPRequestMessage
MessagePerformanceInfo
RemotingMessage
SOAPMessage
In the Different Sandbox Different Domain scenario, the portal and portlet reside in
the different sandboxes, so bootstrap loading of the Flex messaging classes is not an
issue. However, in the Same Sandbox Different Domain scenario, the absence of the
common bootstrap loader results in the first application that happens to load these
classes into its own domain (be that portal or portlet) to block all other siblings from
receiving messages from the 
MessageBroker
.
At Farata Systems, we customized PortalBootstrapLoader, which is a separate Action-
Script project (Figure 7-19).
Figure 7-19. PortalBootstrapLoader project
As you study the code for PortalBootstrapLoader in Example 7-45, notice that in ad-
dition to linking in all classes required by Adobe, we also link in the class
com.farata.portal.Message
. Follow this pattern to link in any class that you want to
make available for all portlets in your portal (and the portal itself).
Example 7-45. PortalBootstrapLoader.as
//PortalBootstrapLoader.as
package {
376 | | Chapter 7: Modules, Libraries, Applications, and Portals
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