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ServiceLocator Quick Tip

1 Comment

Depending on your services setup, and if you use Cairngorm, you have probably seen or written alot of code like this:

public function execute (event:CairngormEvent):void {
var call:AbstractOperation = ServiceLocator.getInstance().getWebService("someName").getOperation("someOperation");

So suppose you have many WSDLs or if you are like me and are using AMFPHP, you might have quite a few Remote Objects logically split up. For instance, you might have 6 RemoteObjects in your ServiceLocator subclass mxml. Like so:

<?xml version="1.0" encoding="utf-8"?>

<mx:RemoteObject id="userServices" source="userServices" destination="amfphp" showBusyCursor="false"/>
<mx:RemoteObject id="journalServices" source="journalServices" destination="amfphp" showBusyCursor="false"/>
<mx:RemoteObject id="adminServices" source="adminServices" destination="amfphp" showBusyCursor="false"/>
<mx:RemoteObject id="activityServices" source="activityServices" destination="amfphp" showBusyCursor="false"/>
<mx:RemoteObject id="miscServices" source="miscServices" destination="amfphp" showBusyCursor="false"/>


I like being able to code quickly and know that I am pointing to the correct RemoteObject without a) having to look at the mxml to get the right name or b) hope that I remember what I called it. In order to do so I added a few lines of code in my <script/> tags to my ServiceLocator subclass named ApplicationServices.mxml:

public static function getInstance ():ApplicationServices {
return ApplicationServices(ServiceLocator.getInstance());

Now when I am quickly making command classes that I want to ensure use a particular RemoteObject without relying on the getRemoteObject() method and my fuzzy memory of what was named I can type:

public function execute (event:CairngormEvent):void {
var call:AbstractOperation = ApplicationServices.getInstance().userServices.getOperation("someOperation");

I think this is a bit cleaner and nicer looking.  And its just one less step to have to remember or reference when creating your commands.


One thought on “ServiceLocator Quick Tip

  1. Often, this is referred to as a facade. It’s extremely good practice.

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