RE: [picocontainer-dev] circular refs.

Hi Paul,

Paul Hammant wrote:
> Mike went through JIRA updating things (thanks Mike).
> 
> One is - http://jira.codehaus.org/browse/PICO-188
> 
> It's about circular refs.  It turns out that we always supported
> circular refs unwittingly. If you did Implementation hiding,
> then the
> circular was possible. Rather than suggest to users that adding
> ImplemementationHiding must be part of the CAF chain for this, I've
> added a characteristic that allows it to specified as you're adding
> the component: 
> 
>      @Test
>      public void circularIsPossible() {
>          DefaultPicoContainer pico = new DefaultPicoContainer(new
> Caching().wrap(new SetterInjection()));
> 
> pico.as(Characteristics.ENABLE_CIRCULAR).addComponent(IFish.class,
>          Fish.class); pico.addComponent(IWater.class, Water.class);
>          IWater water = pico.getComponent(IWater.class);
>          IFish fish = pico.getComponent(IFish.class);
>          assertNotNull(water.getFish());
>          assertNotNull(fish.getWater());
>      }
> It does not matter which component (in a circular log jam) that you
> specify as ENABLE_CIRCULAR, it amounts to the same thing -
> HiddenImplementation will be in the CA chain for that component.
> 
> Thoughts?

IMHO a good idea to enable this as feature for a single component instead of using internally proxies for all components (which was in fact the reason why we did not use it by default in Pico 1.0 IIRC).

- Jörg

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