Torsten Curdt wrote:
>
> Since we would really like to have an autoload
> feature of components. I'd propose the following:
>
> <component class="org.apache.something" autoload="true">
> <parameter name="test" value=""/>
> </component>
>
> In configure
>
> componentManager.configure(conf)
>
> the componentManager is supposed on autoload="true" to
> do a subsequent lookup of this component (or whatever
> is appropriate to create an instance of this component)
>
> Is this a possible sollution?
Take a look at Excalibur's ComponentManagement architecture.
It will allow you to use the ComponentManager to automatically
set up and manage all the components specified in a configuration
file. It has a standard method of declaring components, as well
as a shorthand/user-friendly method. Both methods accomplish the
same thing--however the shorthand method has the added benefit of
enabling a Component to not be declared in a configuration file,
and _still_ be accessed (through the default-class info).
The ComponentManager/Selector automagically determines if the
Component in question is ThreadSafe, SingleThreaded, or Poolable.
If no Configuration element is provided for a Component, but the
Component is Configurable, it will manufacture an empty Configuaration
element. It's pretty cool stuff.
STANDARD DECLARATION
--------------------
<!--
A component directly accessible from the manager
-->
<component role="org.apache.avalon.excalibur.MyRole"
class="org.apache.something">
<parameter name="test" value=""/>
</component>
<!--
A component indirectly accessible from a selector
-->
<component role="org.apache.somethingSelector"
class="org.apache.avalon.excalibur.ExcaliburSelector">
<component-instance hint="foo"
class="org.apache.something">
<parameter name="test" value="foo"/>
</component-instance>
<component-instance hint="bar"
class="org.apache.something">
<parameter name="test" value="bar"/>
</component-instance>
</component>
SHORTHAND ROLE MANAGER CONFIG
-----------------------------
<roles>
<role name="org.apache.avalon.excalibur.MyRole"
shorthand="something"
default-class="org.apache.something"/>
<role name="org.apache.somethingSelector"
shorthand="things"
default-class="org.apache.avalon.excalibur.ExcaliburSelector">
<hint shorthand="something" class="org.apache.something"/>
</role>
</roles>
SHORTHAND COMPONENT CONFIG
--------------------------
<!--
A component directly accessible from the manager
-->
<something>
<parameter name="test" value=""/>
</something>
<!--
A component indirectly accessible from a selector
-->
<things>
<something hint="foo">
<parameter name="test" value="foo"/>
</something>
<something hint="bar">
<parameter name="test" value="bar"/>
</something>
</things>
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