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Configure default instance of a service [message #1801849]

Mon, 28 January 2019 12:19

Pedro de Arquer

Messages: 34
Registered: December 2018

Member

Hi,

I've created a service to be used as singleton. I was wondering if there is a way to create the instance by default and make it non-deletable similarly to, for example, the ClockService?

Kind regards,

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Re: Configure default instance of a service [message #1802029 is a reply to message #1801849]

Thu, 31 January 2019 07:25

Matteo Maiero

Messages: 423
Registered: July 2015
Location: Italy

Senior Member

Hello,
I believe you should replicate the configuration of ClockService into your bundle files.
Furthermore, you could customise the config.ini file to locate and start the jar that wraps your bundle at Kura boot.

Best regards,
Matteo

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Re: Configure default instance of a service [message #1803672 is a reply to message #1802029]

Wed, 06 March 2019 14:28

Pedro de Arquer

Messages: 34
Registered: December 2018

Member

Thank you for your response.

I've replicated ClockService configuration to hide the service implementation and avoid a recreation, but I was unable to avoid deletion of the service.

About the config.ini file, could you point me more precisely to one example. I've configured the snapshot_0.xml to include the service in the initial execution, is there a better approach? This method is vulnerable if a configuration without the service is uploaded as there would be no way to create the service from the interface.

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Re: Configure default instance of a service [message #1803765 is a reply to message #1803672]

Fri, 08 March 2019 16:53

Matteo Maiero

Messages: 423
Registered: July 2015
Location: Italy

Senior Member

Sorry, I don't understand this:
Quote:

but I was unable to avoid deletion of the service

A singleton cannot be deleted from the Kura web ui.

If you had a look at the clock service configuration, https://github.com/eclipse/kura/blob/develop/kura/org.eclipse.kura.linux.clock/OSGI-INF/clock.xml
it says:

configuration-policy="require" enabled="true" immediate="true"

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Re: Configure default instance of a service [message #1803811 is a reply to message #1803765]

Mon, 11 March 2019 11:21

Pedro de Arquer

Messages: 34
Registered: December 2018

Member

Quote:

A singleton cannot be deleted from the Kura web ui

Then maybe I've configured wrongly the component. I've used the following annotation over the class:

@Component(scope = ServiceScope.SINGLETON)

I'll test the immediate clause soon. Thanks for the indication

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Re: Configure default instance of a service [message #1803959 is a reply to message #1803811]

Thu, 14 March 2019 10:48

Pedro de Arquer

Messages: 34
Registered: December 2018

Member

I've tried the immediate clause and the service effectively gets instantiated but it can be configured in the web UI as it is not listed among Kura services. Not even in the snapshot file.

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Re: Configure default instance of a service [message #1803963 is a reply to message #1803959]

Thu, 14 March 2019 13:08

Matteo Maiero

Messages: 423
Registered: July 2015
Location: Italy

Senior Member

Maybe the service did not start.
Please have a look at the OSGi console.

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Re: Configure default instance of a service [message #1804463 is a reply to message #1803963]

Tue, 26 March 2019 12:08

Pedro de Arquer

Messages: 34
Registered: December 2018

Member

Well, definitively I got it. Thanks for all the help provided.

The Singleton declaration was completely counter-productive. Besides it was needed to remove factoryPid from Designate in the configuration file. With these two modifications (ClockService was made this way, so the initial indication you made was correct) the service works like a charm.

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