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https://issues.apache.org/jira/browse/FELIX-5862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Stefan Bischof closed FELIX-5862.
---------------------------------
Resolution: Not A Bug
> Bind a Service with an configurable target/placeholder in @Referance
> annotation
> -------------------------------------------------------------------------------
>
> Key: FELIX-5862
> URL: https://issues.apache.org/jira/browse/FELIX-5862
> Project: Felix
> Issue Type: New Feature
> Components: Declarative Services (SCR)
> Affects Versions: scr-2.1.0
> Reporter: Stefan Bischof
> Priority: Major
>
> Hello,
> my Component ServiceA exists one for each configuration. (foo and bar)
>
> {code:java}
> @Component(service = ServiceA.class, immediate = true)
> @Designate(factory = true, ocd = ConfigA.class)
> public class ServiceA {
> @ObjectClassDefinition
> public @interface ConfigA {
> String ident();
> }
> private ConfigA config;
> private void activate(ConfigA config) {
> this.config = config;
> System.out.println("ServiceA activated with ident: " + config.ident());
> }
> public String getIdent() {
> return config.ident();
> }
> }
> ---
> "my.test.cfgservicetest.ServiceA~foo": {\
> "ident:String": "foo"\
> },\
> "my.test.cfgservicetest.ServiceA~bar": {\
> "ident:String": "bar"\
> },\
> {code}
>
>
> When i use a static target filter "(ident=foo)" felix could find the correct
> service by because the value is set in Component Configuration Properties.
> {code:java}
> @Component(service = ServiceB.class, immediate = true)
> public class ServiceB {
> @Reference(target = "(ident=foo)")
> public void bindServiceA(ServiceA serviceA) {
> System.out.println("Service B -> Service A (ident): " +
> serviceA.getIdent());
> }
> }
> {code}
>
> It would be great if there is a more flexible way, using a placeholder like
> *$CCP*
> {serviceARefIdent} in the targetfilter. When Felix tryes bind the ServiceA to
> ServiceC it could lookup for the *C*omponent *C*onfiguration *P*roperties of
> ServiceC and replace the placeholder in the target filter before searching
> fore the right ServiceA.
>
>
>
>
> {code:java}
> @Component(service = ServiceC.class, immediate = true)
> @Designate(factory = true, ocd = ConfigC.class)
> public class ServiceC {
>
> @ObjectClassDefinition
> public @interface ConfigC { String serviceARefIdent(); }
>
> private ConfigC config;
>
>
> @Reference(target = "(ident=$CCP{serviceARefIdent}
> )")
> public void bindServiceA(ServiceA serviceA)
> { System.out.println("Service B -> Service A (ident): " +
> serviceA.getIdent()); }
> }
> — config
> "my.test.cfgservicetest.ServiceC~foo":
> {\
> "serviceARefIdent:String": "foo"\
> },\
> "my.test.cfgservicetest.ServiceC~bar":{\
> "serviceARefIdent:String": "bar"\
> }\{code}
>
> I couldn't find information about this in the OSGi Spec.
>
> Is there any way to do this at the moment?
> Is there a better way to bind 2 factory-configured services to each other
> (without Servicetracker)?
> Is there any way to add this to Felix SCR(direct or as kind of scr-plugin?)
>
> It also would be nice to filter with SystemEnviromentPropertys
> {code:java}
> @Reference(target = "(ident=$ENV{serviceARefIdent})")
> {code}
>
>
>
> Regards
> Stefan
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