[jira] Commented: (FELIX-1114) callback after configuration change needed

["Ron Koerner (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FELIX-1114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12704716#action_12704716 ] 

Ron Koerner commented on FELIX-1114:
------------------------------------

Since I desperately need something like this, I'll provide a patch next week (unless someone tells me how to do it on another way).

> callback after configuration change needed
> ------------------------------------------
>
>                 Key: FELIX-1114
>                 URL: https://issues.apache.org/jira/browse/FELIX-1114
>             Project: Felix
>          Issue Type: Improvement
>          Components: iPOJO
>    Affects Versions: iPOJO-1.2.0
>            Reporter: Ron Koerner
>
> It often occurs that a configuration/property change requires some work to be done. If only a single property is affected method injection can be used.
> If multiple properties are changed and these changes are kind of an atomic transaction, there is no (sensible) way to tell the service to use the new values.
> Imagine a service listening on a port and writing the output to a file. The service has the two string properties "port" and "file". When the service is validated, it opens a listening port and a writable file according to the properties. Now imagine it is either dangerous to have a port input written to the wrong file or opening ports and files is very costly or there is already an object doing the work for us but it needs to be constructed with port number and filename and cannot be changed at runtime. Therefore we cannot use method injection like
> @Property(name="port")
> public void setPort(String port)
> {
>    incomingSocket.close();
>    incomingSocket=new IncomingSocket(port);
> }
> because that is costly and leaves the possibility to have things written to the wrong file.
> Therefore something like
> @Updated
> public void updatedConfiguration()
> {
>   // put changed configuration in use
> }
> is needed. The method annotated with @Updated (or specified in XML) is to called after all the configuration changes are done.
> Right now, the only way is to stop and start the service since only one ManagedService per PID is recognized by ConfigurationAdmin.

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