Re: [equinox-dev] Influencing component start with DS

[BJ Hargrave <hargrave@xxxxxxxxxx>]

A better way to do this would be to use an immediate component which 
enables/disables the interesting component when the criteria is met/unmet. 
The details of the criteria could be supplied in component properties of 
the immediate component.

BJ Hargrave
Senior Technical Staff Member, IBM
OSGi Fellow and CTO of the OSGi Alliance
hargrave@xxxxxxxxxx
Office: +1 407 849 9117 Mobile: +1 386 848 3788



Roy Paterson/Austin/IBM@IBMUS 
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2006-02-23 10:34 AM
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Re: [equinox-dev] Influencing component start with DS







There is no interface for hooking in to DS in that way, but you could 
implement the same thing with a service.  Your logic could sit in it's own 
bundle checking it's criteria.  When the criteria is met it publishes some 
dummy service.  The Service Component would be dependent on the service, 
so when the service is published the component will be activated. 

Roy

-----------------------------------------
Roy Paterson
IBM Pervasive Computing
Austin, TX
Phone: (512) 838-8898



Subbarao Meduri <subbarao_meduri@xxxxxxxxx> 
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02/23/2006 07:43 AM 

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[equinox-dev] Influencing component start with DS








Imagine a scenario where a service component should only start if certain 
environment 
criteria is met. One way to handle this would be that the criteria is 
represented as 
a property in the component meta-data and the component can use it at 
runtime to decide
to shut itself down if the criteria is not met. The downside of such 
approach is that 
the component code is now contaminated with the criteria. 

Is there a mechanism that allows to plug-in additional logic to SCR 
runtime to 
influence whether a component should be started ?

Regards,
Subbarao

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