Hi,
On 28.04.2010, at 03:24, Tribon Cheng wrote:
> I am not sure i'v catch your mind.
>
> But i also attemp to use service factory to construct various service
> instance with different runtime configurations.
This is partially doable with ManagedServiceFactories (configuration admin).
>
> I found it's difficult to do this. How can the configuration be set through
> blueprint?
>
> I mean when you use the "<Reference>" to use a servicefactory service , it's
> not supported to configure parameters to construct different service
> instance.
I don't know about blueprint, but iPOJO provides this feature.
when you declare a component type (with @Component), you can then create
several instances of this type with different configurations. The
configurations can impacts properties, service properties, service dependency
filters...
So, image that you have
@Component
@Provides
public void MyImpl implements MyService {
@Property
private String prop1;
//...
}
Then, you can declare two instances:
<ipojo>
<instance component="...MyImpl">
<property name="prop1" value="value1"/>
</instance>
<instance component="...MyImpl">
<property name="prop1" value="value2"/>
</instance>
</ipojo>
At runtime, you will have two instances with different properties. The service
will be published by the two instances.
Regards,
Clement
>
> 2010/4/28 Holger Hoffstätte <[email protected]>
>
>> Donald Whytock wrote:
>>> Then it occurred to me that there are multiple types of services I'd
>>> like to do this with, which seemed to call for an abstract class,
>>> similar to ServiceBinder.GenericActivator, that could be subclassed
>>> with the ServiceImpl and the ServiceFactoryImpl. Thus serving as a
>>> service factory service...factory.
>>>
>>> Is there an easy, already-established way to do this?
>>
>> Sadly not standardized, which is why there is currently an RFP open for
>> voting within the OSGi member group - hopefully resulting soon in a proper
>> RFC and implementation. Until then you will probably have to look at what
>> iPOJO, SpringDM or Blueprint offer or roll your own.
>>
>> -h
>>
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>
>
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