Re: Architecture of reusable modules with different view perproject

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João Saleiro Email/MSN: joao.saleirowebfuel.pt" class="style2">joao.saleirowebfuel.pt Skype: joao.saleiro Tel: +351 916 077 097 / +351 968 203 370 WWW: http://www.webfuel.pt

mail.gmail.com" type="cite">I agree this is a common issue.
I think you are on the right track.
If it was me I would do something like this (which is similiar to what you describe).

You have 1 container that runs pureMVC.

Usually within PureMVC you must register serveral mediators, several CommandClasses (including command classes that prep the model and view).
To support modules I would think you should create a mechanism to inject these registrations at run time.

Whether you can get more reusability by including V or just the M and the C is your choice, but I would replace the hardcoded registrations with a dynamic one that uses objects that come from the module being used.

More specifically the module should expose functionality that allows the applicationFacad to iterate through a Mediator Factory and a Command Class factory.  Your applicationFacad should iterate through each module and for each module iterate through the factories to get all of the objects that will be registerd.

Does seem right?

On Wed, May 7, 2008 at 5:15 PM, João Saleiro <webfuel.pt">joao.saleirowebfuel.pt> wrote:

Iman,

If you post this question to the www.oodforum.com with more information and an example I will try to give you a more exact solution.

what if I post more information here on osflash, will you give me a more exact solution?

I am setting up an ecosystem for building several large-scale enterprise RIAs. Each RIA can be composed by one or several Modules. I am not worried right now with having different SWF's (aka Flex Modules), but with encapsulating modules for reusability and maintainability.
Each module is responsible for a part of the application. For example, managing registered users. So a module can add users, remove, update, etc.
Each module has it's own MVC architecture, so I needed a multi-core framework to solve the problem of having multiple singletons.
I can have different teams working on a different module, and testing it without depending on the application.

Normally these modules are never the same between projects. There are always slight differences between businesses so it's hard to reuse a full module (in another words, import the module from a shared library path and use it as it is)

But there are also modules that are always the same between projects. For example, our LocaleManager that allows the user to add new languages to the RIA and create custom localizations. So we have for example our application on the package com.application  and the module on the package pt.webfuel.modules.locale .

Until this point everything's fine. The problem starts when we want to reuse the module on different projects, but the view is different on each project. The behaviour (controller) is the same , the proxys and VO's are the same (model), but the view is different.
The solution I come with involves keeping the MC parts of MVC on the module, and making the V (components+mediators) part on the application, allowing it to inject the view on the module. My module implements an IViewReceiver so it has a method injectView(mediator:Mediator).This method will register the view on the ApplicationFacade of the module.
If I want to use the same view on several projects, I also can. I just need to put the view on the package of the module, and the application just injects that specific view.

This way I can reuse modules between projects, but with completey different views. What's shared is the data (model) and behaviour (controller).

Of course, the application needs to know the "core" of the module (the framework) since it's the application that has the implementation of the mediator of the module's view. I don't see a problem there. Also, the module knows nothing about the application, so it's also fine to me. The thing is that:

• This is just my solution, that isn't fully implemented so I haven't tested on a real situation;
• This is probably a common problem... and normally for common problems there are common solutions. Is there other solutions?
  

BTW, for those who don't know PureMVC, one of the best things of the framework is that the views are 100% independent of the framework. There are also some other "details" I like (multicore, being platform independent, simple structure), but I still haven't tested it fully on a production project. If there is interest, after I get better with PureMVC I can make a review from the point of view of an old ARP/Cairngorm addict.

Thanks,

João Saleiro

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