RE: [flexcoders] Cairngorm ServiceLocator and FDS

[Dimitrios Gianninas]

Glad to see I'm not crazy :) With this thread this afternoon, I was like "oh ya, I still need to clean my DataServices code and put it in the ServiceLocator". And then I started the work and was like, how is this going to work, a DataService ain't so simple as RPC services. As you noted below it is much more "smart" since it has properties like 'commitRequired' and 'mergeRequired'... in my app those property are binded to controls to provide visual feedback to the user.   So my first thought was to wrap it in some class... like a delegate, but seems redundant, so still thinking....   Dimitrios Gianninas RIA Developer Optimal Payments Inc.   From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Steven Webster Sent: Tuesday, July 11, 2006 5:32 PM To: flexcoders@yahoogroups.com Subject: RE: [flexcoders] Cairngorm ServiceLocator and FDS Hey Mike,   So that's an interesting question you ask; our intention for ServiceLocator is support for the RPC services in Flex ... at least that is the heritage of the ServiceLocator from Flex 1.5, and that's how we've personally been using it in Flex 2.   For the Flex Data Services apps that we're building, we're still chewing around on a number of different approaches, and haven't yet reached a conensus on what we consider "bestest-practice"; there are so many different use-cases.    My instincts are that data services don't need to be declared on the ServiceLocator, and that managed collections are more akin to "intelligent model" objects; that if a command is used to manipulating a model (via the model locator) onResult of an RPC call, it makes sense in the data services world that a Command no-longer needs asynchronous result handlers, but can instead optimistically manipulate a model (a collection with data services) within the execute() method of a command.  So a command still updates the model, and binding notifies the view - so the "MVC" approach we achieve in Cairngorm still holds.   This then begs the question of where you define/create/initialise/etc your collections; is that the ServiceLocator, or is it somewhere else.  Jury is still out for me.   I'm as keen to hear your thoughts as you may be to hear ours.  It still "feels" right to me that the ServiceLocator remains "RPC only", but I can be convinced with a good argument.   Thoughts ?   Steven     Steven Webster Practice Director (Rich Internet Applications) Adobe Consulting Westpoint, 4 Redheughs Rigg, South Gyle, Edinburgh, EH12 9DQ, UK p: +44 (0) 131 338 6108 m: +44 (0) 7917 428 947  [EMAIL PROTECTED]   From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Mike_Robinson_98 Sent: 11 July 2006 19:17 To: flexcoders@yahoogroups.com Subject: [flexcoders] Cairngorm ServiceLocator and FDS Is it possible to define a <mx:DataService> in the ServiceLocator or is ServiceLocator useful only for <mx:RemoteObject> and <mx:WebService>? In the examples I have seen you retrieve a service from the ServiceLocator with something like this: ServiceLocator.getInstance().getService("ordersService"); However, the getService() method returns an AbstractService which only WebService and RemoteObject extend. Is there some other mechanism to be able to use a DataService within the ServiceLocator? The getInvokerService method also does not look like it is useful for this purpose. Thanks, Mike AVIS IMPORTANT WARNING Ce message électronique et ses pièces jointes peuvent contenir des renseignements confidentiels, exclusifs ou légalement privilégiés destinés au seul usage du destinataire visé. L'expéditeur original ne renonce à aucun privilège ou à aucun autre droit si le présent message a été transmis involontairement ou s'il est retransmis sans son autorisation. 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