Thanks a lot for taking the time to explain it. That helps quite a bit.
Ricardo
On Apr 7, 2012, at 11:07 PM, Henrique Prange wrote:
> Hi Ricardo,
>
> WOInject is a framework that enables dependency injection in WebObjects
> applications by integrating the Guice framework.
>
> OK. It doesn't help much. :) I'm not sure about the level of knowledge you
> have about DI or Guice. So, here is a list of the topics you should know to
> understand what WOInject can do for you. You can skip the topics you are
> already familiar with.
>
> 1) What is dependency injection?
>
> You can learn the theory behind dependency injection and inversion of control
> containers in the Martin Fowler article [1] about the subject.
>
> 2) What is Guice?
>
> I think the Motivation page [2] on the Guice's User Guide is the best place
> to start understanding the basic problems, and the solutions proposed by
> Guice.
>
> 3) What is WOInject?
>
> WOInject is just a framework to integrate Guice with WebObjects in a
> non-intrusive manner. So, what Guice can do for you?
>
> Suppose you have a Service interface and a BasicService implementation for
> it. This Service is required across your components. So you have something
> like this:
>
> class ComponentOne {
> Service service = new BasicService();
> }
>
> class ComponentTwo {
> Service service = new BasicService();
> }
>
> ...
>
> Then, the project evolves, and you develop a new AdvancedService
> implementation for the Service interface. You have to traverse the entire
> code base updating the instantiation of Service.
>
> On the other hand, if you use Guice, you can delegate the creation of
> Services to Guice, and inject the instances of Service when required. You
> write code like this:
>
> class ComponentOne {
> @Inject
> Service service;
> }
>
> class ComponentTwo {
> @Inject
> Service service;
> }
>
> ...
>
> And you configure a Guice Module to specify that you want an instance of
> BasicService (or an AdvancedService) when you need a Service.
>
> class AppModule extends AbstractModule {
> void configure() {
> bind(Service.class).to(BasicService.class);
> }
> }
>
> If you need to change the implementation class, you just have to redefine
> your module:
>
> class AppModule extends AbstractModule {
> void configure() {
> bind(Service.class).to(AdvancedService.class);
> }
> }
>
> This is a basic example of what Guice (and dependency injection) can do for
> you. Real-world problems are much more complex. A Service implementation may
> require a Connection that needs a URL and Credentials to work. Guice can
> handle the entire hierarchy of dependencies for you.
>
> Of course, Guice can do a lot more for you. I'm still preparing a few use
> cases for the WOInject's User Guide to demonstrate situations where
> dependency injection is helpful and other Guice's features that make it so
> powerful.
>
> [1]http://martinfowler.com/articles/injection.html
> [2]http://code.google.com/p/google-guice/wiki/Motivation
>
> Cheers,
>
> Henrique
>
> On 05/04/2012, at 16:17, Ricardo J. Parada wrote:
>
>>
>>
>> Is there a short explanation of what it does? Can it be explained with a
>> code snippet or in a paragraph?
>> I still don't quite understand the concept. :-)
>>
>>
>>
>>
>> On Apr 4, 2012, at 1:11 PM, Henrique Prange wrote:
>>
>>> Hi Paul,
>>>
>>> Don't get me wrong. I really appreciate the interest in WOInject. It is an
>>> honor for me to talk on WOWODC again. I'm working hard here to make it
>>> happen. However, I'm still not sure if I'll be able to afford the trip to
>>> Canada. :( So, I don't want to create expectations for something I may not
>>> be able to deliver.
>>>
>>> Cheers,
>>>
>>> Henrique
>>>
>>> On 04/04/2012, at 02:02, Paul Hoadley wrote:
>>>
>>>> On 15/03/2012, at 5:04 PM, Johann Werner wrote:
>>>>
>>>>> Am 15.03.2012 um 07:12 schrieb ISHIMOTO Ken:
>>>>>
>>>>>> Would be nice to see that at WOWODC in Action.
>>>>>
>>>>> +1
>>>>
>>>> Hey, Henrique, I didn't see a response to this—any chance you'll be at
>>>> WOWODC 12 and in the mood for a talk/demo/workshop on WOInject? Even
>>>> informally?
>>>>
>>>>
>>>> --
>>>> Paul.
>>>>
>>>> http://logicsquad.net/
>>>>
>>>>
>>>>
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>>>
>>>
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>
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