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Service Factory with Declared Service [message #1181219]

Mon, 11 November 2013 13:05

Richard Meyer

Messages: 40
Registered: June 2012

Member

Hy,

I use a Service Factory to control the creation of my Service Components.
Simply something like this:

public class LoggerServiceFactory implements ServiceFactory<ILogger>
{
	@Override
	public ILogger getService(Bundle bundle,
			ServiceRegistration<ILogger> registration) 
	{
		return new LoggerImpl();
	}

	@Override
	public void ungetService(Bundle bundle,
			ServiceRegistration<ILogger> registration, ILogger service) {
		
	}
}

now I can register this factory at the bundle startup:

Hashtable<String, Object> props = new Hashtable<>();
bundleContext.registerService(ILogger.class.getName(), new LoggerFactory(), props);

My question now is:
How can I exchange the programmaticly registration on bundle startup with declarative services?
I have tried to declare it in the XML file like a normal Component but it does not work:

 <implementation class="org.my.LoggerServiceFactory"/>
   <service>
      <provide interface="org.my.ILogger"/>
   </service>

Thanks in advance.
Richard

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Re: Service Factory with Declared Service [message #1181298 is a reply to message #1181219]

Mon, 11 November 2013 14:06

Thomas Watson

Messages: 503
Registered: July 2009

Senior Member

Try using the following instead which has the attribute servicefactory

 <implementation class="org.my.LoggerServiceFactory"/>
   <service servicefactory="true">
      <provide interface="org.my.ILogger"/>
   </service>

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Re: Service Factory with Declared Service [message #1181329 is a reply to message #1181298]

Mon, 11 November 2013 14:35

Richard Meyer

Messages: 40
Registered: June 2012

Member

Hy Thomas,

many thanks for your quick reply.
But if I set the servicefactory="true" I received the following error:

!MESSAGE FrameworkEvent ERROR
!STACK 0
org.osgi.framework.ServiceException: org.eclipse.equinox.internal.ds.ServiceReg.getService() returned a service object that is not an instance of the service class org.my.ILogger

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Re: Service Factory with Declared Service [message #1181380 is a reply to message #1181329]

Mon, 11 November 2013 15:13

Thomas Watson

Messages: 503
Registered: July 2009

Senior Member

Hmmm, now that is strange, because your code you posted before seems to indicate that it DID return ILogger instances. Is there any chance multiple versions of the package org.my are available in the system?

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Re: Service Factory with Declared Service [message #1181554 is a reply to message #1181380]

Mon, 11 November 2013 17:27

BJ Hargrave

Messages: 60
Registered: July 2009

Member

When you use servicefactory=true in DS, your implementation class must NOT implement ServiceFactory. DS takes care of creating the instances of your implementation class. So make your implementation class be LoggerImpl and not LoggerServiceFactory.

<implementation class="org.my.impl.LoggerImpl"/>
   <service servicefactory="true">
      <provide interface="org.my.ILogger"/>
   </service>

Also, make sure to place your service types (e.g. ILogger) in a different package than your impl types (e.g. LoggerImpl).

[Updated on: Mon, 11 November 2013 17:29]

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Re: Service Factory with Declared Service [message #1182849 is a reply to message #1181554]

Tue, 12 November 2013 13:02

Richard Meyer

Messages: 40
Registered: June 2012

Member

Hy BJ,

thanks for your reply.
But my aim is to use my own service factory to create the instances and not to use the default implementation of DS!
(The point is that the real LoggerImpl is an EMF class and therefore I have to call the EMF Factory to create the class)

[Updated on: Tue, 12 November 2013 13:04]

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Re: Service Factory with Declared Service [message #1183129 is a reply to message #1182849]

Tue, 12 November 2013 17:02

BJ Hargrave

Messages: 60
Registered: July 2009

Member

Then you cannot use DS for that. DS will not delegate to your ServiceFactory implementation. In this case you need to register your service using the OSGi API.

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