Right, but in addition to instanceFactory, we also need to provide the
methodFactory.
So if we have
class ColorFactory {
public void setFoo(String foo) { }
public Color createColor(String type) { }
}
class RGBColor extends Color {
public void setR(int r) {}
public void setG(int g) {}
public void setB(int g) {}
}
class YUVColor extends Color {
public void setY(int y) {}
public void setU(int u) {}
public void setV(int v) {}
}
then, we'd have:
ObjectRecipe colorFactoryRecipe = new ObjectRecipe(ColorFactory.class)
colorFactoryRecipe.setProperty("foo", "bar"); factory
ObjectRecipe rgbRecipe = new ObjectRecipe();
rgbRecipe.setInstanceFactory(colorFactoryRecipe);
rgbRecipe.setMethodFactory("createColor");
rgbRecipe.setProperty("type", "rgb");
rgbRecipe.setProperty("r", "255");
rgbRecipe.setProperty("g", "255");
rgbRecipe.setProperty("b", "255");
If we have:
class ColorFactory {
public static Color createColor(String type) { }
}
then we'd have:
ObjectRecipe redRecipe = new ObjectRecipe();
redRecipe.setClassName(ColorFactory.class);
redRecipe.setInstanceFactory(null);
redRecipe.setMethodFactory("createColor");
redRecipe.setProperty("r", "255");
But Jarek is right, and we might have other problems with the way the
arguments matching is done.
On Thu, Apr 23, 2009 at 19:26, David Blevins <[email protected]> wrote:
> [cc'ing the [email protected] list]
>
> On Apr 23, 2009, at 9:56 AM, Guillaume Nodet wrote:
>
>>>>
>>>> In blueprint, there is a notion of factory
>>>> component, which should be built by its own recipe
>>>
>>> With you so far.
>>>
>>>> , then used as a reference to create the object using arguments if any
>>>
>>> Not sure what "used as a reference" means. Also not sure what "using
>>> arguments" means. Are the arguments somehow different than the
>>> properties
>>> in a recipe? Where do they come from?
>>
>> Just meaning that the factory is itself a bean usually created with
>> its own recipe.
>> So the properties on the recipe that uses the factory will be used to:
>> * call the factory method
>> * populate the created beans with properties
>>
>>>> , then populating the created beans using properties.
>>>
>>> So the factory is allowed to create several beans and I guess is kept
>>> around
>>> and the resulting beans should be injected with it's own set of
>>> properties?
>>
>> Right
>
> So is this basically what you're talking about? (making up some api here)
>
> ObjectRecipe colorFactoryRecipe = new ObjectRecipe(ColorFactory.class)
> colorFactoryRecipe.setProperty("foo", "bar"); // set the properties for the
> factory
>
> ColorFactory colorFactory = (ColorFactory) factoryRecipe.create();
>
> ObjectRecipe redRecipe = new ObjectRecipe();
> redRecipe.setInstanceFactory(colorFactory);
> redRecipe.setProperty("r", "255");
> redRecipe.setProperty("g", "0");
> redRecipe.setProperty("b", "0");
>
> Color red = (Color) redRecipe.create();
>
> ObjectRecipe blueRecipe = new ObjectRecipe();
> blueRecipe.setInstanceFactory(colorFactory);
> blueRecipe.setProperty("r", "0");
> blueRecipe.setProperty("g", "0");
> blueRecipe.setProperty("b", "255");
>
> Color blue = (Color) redRecipe.create();
>
> That the basic idea?
>
> -David
>
>
>
--
Cheers,
Guillaume Nodet
------------------------
Blog: http://gnodet.blogspot.com/
------------------------
Open Source SOA
http://fusesource.com
