Hi,
It looks like what you are trying to achieve can simply be made using a regular
@Requires injection (or with the @Bind/@Unbind annotations, if you want to be
notified when an algorithm arrives or leaves).
Your Algorithm class is the service specification. You concrete class should be
a component registering the Algorithm service:
@Component
@Provides
@Instantiate
public ConcreteClass implements Algorithm {
//...
}
Notice that because it’s a component, the concrete class constructor must be
either without parameter or use @Property to inject values.
Finally, your ‘extender’ is just:
@Component(immediate=true
@Provides
@Instantiate
public Host {
@Requires
Algorithm[] algorithms;
}
To answer your initial question, the extender is looking for bundle’s manifest
entry, which does not seem adequate in your context.
Regards,
Clement
On 5 juin 2014, at 18:34, Luis Neto <[email protected]> wrote:
> Hi all, sorry if this question is to naive but i am struggling to
> understand how
> iPOJO indentifies the extender matching bundles.
>
> I have a super class and a concrete class that i want to perform some
> logic, first i have
> thought that iPOJO automatically by declaring the property:
>
>> <provides specifications="Algorithm"/>
>>
> on the concrete class.
>
> Then i've done some more reading and i have seen the PAX-WEB example and i
> tried to declare
> the property <Algorithm> in the concrete class bundle manifest header.
>
> So my question is how to declare the property so the extender service can
> identify the bundle?
>
> I've declared and implemented my extender service as follows:
>
>
> <component
>> classname="com.MyExtender"
>> name = "MyExtender" public="false">
>> <extender:extender
>> extension="Algorithm" onArrival="onBundleArrival"
>> onDeparture="onBundleDeparture" />
>> <callback transition="invalidate" method="stop" />
>> <callback transition="validate" method="start" />
>> </component>
>> <instance
>> name="algorithm.extender"
>> component="MyExtender">
>> </instance>
>>
>
> The superclass:
>
> public abstract class Algorithm{
>>
>> String name;
>> String version;
>>
>> public Algorithm(String name, String version){
>> this.name = name;
>> this.version = version;
>> }
>>
>> public String getName(){
>> return name;
>> }
>> ...
>>
>> abstract public void computeSomething(Map<a,b> data);
>>
>
> And concrete subclasses as follows:
>
> public class ConcreteAlgorithm extends Algorithm{
>>
>> Map<a,b> data;
>>
>> public ConcreteAlgorithm(String name, Map<a,b> data){
>> super(name);
>> data = data;
>> }
>>
>> public void computeSomething(Map<a,b> data){
>> //compute data
>> }
>
>
> Best regards,
> Luis
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