Very good! Thanks for the info. -----Original Message----- From: Richard S. Hall [mailto:[email protected]] Sent: Tuesday, June 29, 2010 11:01 AM To: [email protected] Subject: Re: iPOJO and OSGi LogService
On 6/29/10 12:15, Joel Schuster wrote: > What's the functional difference b/t > > @Component > @Instantiate > > And > > @Component( immediate=true) > @Component declares some class as an iPOJO component type. It does not create an instance. The "immediate" attribute tells iPOJO, "if at some point in time you create an instance of this type, don't defer creation", but it still doesn't create an instance, it just tells iPOJO how to handle instance creation. @Instantiate actually informs iPOJO to create an instance of the component type when its dependencies are satisfied at which point in time iPOJO will defer actual instance creation until a request is made for a service provided by the instance, unless "immediate=true" is specified, then iPOJO will instantiate the component as soon as its dependencies are satisfied. Deferring actual instance creation is a performance optimization, but sometimes you don't want instantiation to be deferred because you need to kickstart your application. Note that @Instantiate may seem convenient, but it is bad practice since it couples types to instances and makes reuse of your types more difficult. It is better to use a separate bundle with an iPOJO XML file to create and configure instances. -> richard > ?? > > -----Original Message----- > From: Clement Escoffier [mailto:[email protected]] > Sent: Tuesday, June 29, 2010 10:08 AM > To: [email protected] > Subject: Re: iPOJO and OSGi LogService > > Hi, > > > On 29.06.2010, at 16:28, LongkerDandy wrote: > > >> Hi >> >> I've problem to inject the LogService with iPOJO. >> My environment is: >> Framwork 3.0.1 with Gogo Shell >> org.apache.felix.log-1.0.0 >> iPOJO 1.6.2 >> >> I'm trying to inject the LogService with a field: >> "private transient LogService logger;" >> And with iPOJO metadata.xml configured >> >> >> <ipojo> >> <component name="disks-service" >> classname="net.redrabbit.homecenter.system.DisksService"> >> <requires field="logger"/> >> <provides /> >> <callback transition="validate" method="start"/> >> <callback transition="invalidate" method="stop"/> >> </component> >> <instance name="disks-instance" component="disks-service"/> >> </ipojo> >> >> >> But the logger turned out to be NULL when executing. >> I can't understand. >> > This should work. I tried: > @Component > @Instantiate > public class Test { > > @Requires > private transient LogService logger; > > @Validate > public void start() { > logger.log(LogService.LOG_INFO, "Hello"); > } > } > > And I got the expected result. > > Could to post the code of your component ? > > Regards, > > Clement > > > >> Regards >> LongkerDandy >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: [email protected] >> For additional commands, e-mail: [email protected] >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
