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From "Felix Meschberger (JIRA)" <j...@apache.org>
Subject [jira] Closed: (FELIX-2288) Felix SCR API problem/misunderstanding
Date Mon, 16 Aug 2010 12:12:22 GMT

     [ https://issues.apache.org/jira/browse/FELIX-2288?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Felix Meschberger closed FELIX-2288.

Apache Felix Declarative Services 1.6.0 has been released. The issues are now closed.

> Felix SCR API problem/misunderstanding
> --------------------------------------
>                 Key: FELIX-2288
>                 URL: https://issues.apache.org/jira/browse/FELIX-2288
>             Project: Felix
>          Issue Type: Bug
>          Components: Declarative Services (SCR), Web Console
>    Affects Versions: scr-1.0.0, scr-1.0.2, scr-1.0.4, scr-1.0.6, scr-1.0.8, scr-1.2.0,
 scr-1.4.0, webconsole-3.1.0
>            Reporter: Valentin Valchev
>            Assignee: Felix Meschberger
>            Priority: Critical
>             Fix For:  scr-1.6.0, webconsole-3.1.2
> I've been playing with the Components plugin of the Web Console and it work perfectly
with the Felix SCR implementation. When I switched to ProSyst/Equinox implementation (they
are basically the same) I found a small problem.
> When I disable a component, it's ID becomes -1 and I cannot enable it anymore. As long
as I disable components all their IDs becomes -1.
> I opened the OSGi r4.2 specification to see if there is a reason for this behaviour.
The JavaDoc for ComponentConstants states for the component ID, that 
> "The value of this property is assigned by the Service Component Runtime when a component
configuration is created."
> In part 112.6 Component Properties, the specification says, that 'component.id' property
is always added by the SCR but for "Each component configuration".
> When a component is disabled or uninstalled, there is no configuration - it's just a
component definition. So the SCR is not required to assign ID.
> As for the Web Console we can easily fix the problem by using the pair bundle + component
name for identification, instead of ID. However, since Apache SCR API is becoming recommended
OSGi API, it would be better to define a mature and compatible API.

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