This a modified version of Jeff Tapper's singleton DataManager
class for AS3 web service calls. Francis, note the private class
constuctor at the bottom. Sorry about the jagged alignment.
- Tim Hoff
package code.business {
import mx.managers.CursorManager;
import flash.events.EventDispatcher;
import mx.rpc.soap.WebService;
import mx.rpc.events.ResultEvent;
import mx.rpc.events.FaultEvent;
import mx.rpc.AbstractOperation;
import mx.controls.Alert;
import flash.util.*;
public class DataServices extends EventDispatcher {
private var ws:WebService;
private static var instanceMap:Object = new Object();
public function DataServices(pri:PrivateClass, wsdl:String)
{
this.ws = new WebService();
ws.wsdl = wsdl;
ws.loadWSDL();
ws.useProxy = false;
}
public static function getDataService
(wsdl:String):DataServices
{
if(DataServices.instanceMap[wsdl] == null)
{
DataServices.instanceMap[wsdl] = new DataServices
(new PrivateClass(),wsdl);
}
var ds:DataServices = DataServices.instanceMap[wsdl];
if(ds.ws.canLoadWSDL())
{
return ds;
} else {
throw new Error("BAD WSDL:"+wsdl);
}
}
public function makeRemoteCall
(methodName:String,showBusyCursor:Boolean,args:Object):void
{
var op:mx.rpc.AbstractOperation = ws[methodName];
if(showBusyCursor)
{
CursorManager.setBusyCursor();
}
ws.addEventListener("result",onResult);
ws.addEventListener("fault",onFault);
if(args)
{
op.arguments = args;
}
op.send();
}
private function onResult(result:ResultEvent):void
{
CursorManager.removeBusyCursor();
this.dispatchEvent(result);
}
private function onFault(fault:FaultEvent):void
{
CursorManager.removeBusyCursor();
this.dispatchEvent(fault);
}
public override function toString():String
{
return "DataServices";
}
}
}
/** PrivateClass is used to make DataServices constructor private
*/
class PrivateClass
{
public function PrivateClass() {}
}
--- In [email protected], "Francis Cheng" <[EMAIL PROTECTED]>
wrote:
>
> That works in C# because the default access specifier for class
members
> in C# is private. It won't work in ActionScript 3.0 because the
> constructor is always public, whether or not you declare it as
such.
>
> Francis
>
> > -----Original Message-----
> > From: [email protected]
[mailto:[EMAIL PROTECTED]
> On
> > Behalf Of crnet_flex
> > Sent: Friday, April 14, 2006 3:19 PM
> > To: [email protected]
> > Subject: [flexcoders] Re: Singleton not usable?
> >
> >
> > Hi
> >
> > Have anyone tried using a construction like the following?
> >
> > public class Singleton
> > {
> > public static const Instance:Singleton = new Singleton();
> >
> > function Singleton()
> > {
> > }
> >
> > public function doSomething():void
> > {
> > }
> > }
> >
> > This is actually the recommandations of creating a singleton in
c#,
> > and it seems that it fullfils the job here as well.
> >
> > I know that, if you use flexbuilder 2 beta, then you'll get a
> > warning if you leave out the scope of the constructor, but maybe
> > it's worth it.
> >
> > By the way, be aware that the singleton posted initially as an
> > example is not a recommended way of creating a singleton, i guess
> > it's not a problem in AS3, but lazy loaded singletons must have a
> > syncronized/looked load section when thread safety is an issue.
> >
> > BR Casper
>
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