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From Stephen Colebourne <>
Subject Re: [lang] Generic object factories
Date Sat, 26 Dec 2009 23:55:15 GMT
Once upon a time, there was a commons sandbox project that held all 
sorts of small interfaces just like this one. It was called commons-pattern.

It didn't suceed, because these interfaces really need to be provided by 
the JDK and implemented by all the JDK classes to be successful. Beyond 
that, it turned out to be better to have domain specific interfaces.

Thus, I would recommend stronlgy against having this in [lang]. Today, 
[functor] and [collections] are the right places for this in commons - 
[lang] doesn't have the necessary domain to back it up.


Oliver Heger wrote:
> With Java 1.5 it is possible to define a generic interface for creating 
> an object:
> public interface ObjectFactory<T> {
>     T create();
> }
> This is a proposal to add such an interface to [lang] 3.0 with a couple 
> of default implementations, e.g.
> - a ConstantObjectFactory returning always the same constant object,
> - a ReflectionObjectFactory which creates new instances of a given class 
> using reflection
> Some Initializer classes in the concurrent package also deal with the 
> creation of objects. They could implement this interface, too.
> Client classes that use this interface to create dependent objects would 
> be pretty flexible. By specifying concrete factory implementations it is 
> easy to configure the concrete objects they use and how they are created 
> as well.
> Does this make sense?
> Oliver
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