Re: [equinox-dev] Working with ConfigAdmin service

[Ali Naddaf <ali@xxxxxxxxxx>]

Hi Simon.

Thanks for you detailed help, very much appreciated. I managed to get around that and now I am running into a different problem when I am trying to update teh configuration in my managed service. I see the following in my log:

Warn [4] Configuration for service.pid=test.bundle could not be bound to file:LogTest2_1.0.0.jar initial@reference:file:org.eclipse.equinox.cm_1.0.100.v20090520-1800.jar/

What are the possible causes of this and where should I start looking for the issue? I have a simple Managed Service, LogTest2 bundle:

------- Activator of LogTest2 Bundle ------------------------
(snippet)

public void start(BundleContext context) throws Exception {
       ......
        Properties properties = new Properties();
        properties.put(Constants.SERVICE_PID, "test.bundle");
        registration = context.registerService(ManagedService.class.getName(), this, properties);
       .......
}

public void updated(Dictionary properties) throws ConfigurationException {
        System.out.println("Configuration is being updated...");
        Integer newLogLevel = (Integer) properties.get("log-level");
        String newLogLocation = (String) properties.get("log-location");
       ........
}
---------------------------------------------------------------------------------

And I have a bundle (called LogConfigurator) to update configuration for LogTest2 bundle:

-------my main Component for LogConfigurator -------------

    public void setConfigAdmin(ConfigurationAdmin admin) {
        this.admin = admin;
    }
   
    public void unsetConfigAdmin(ConfigurationAdmin admin) {
        this.admin = null;
    }
   
    public void activate(ComponentContext context) {
        try {
            config = admin.getConfiguration("test.bundle");
            if (null != config) {
                Dictionary properties = config.getProperties();
                // this prints out the location for LogConfigurator instead of LogTest2!
                // which I guess it means it hasn't found the LogTest2 bundle
                System.out.println(config.getBundleLocation());
                if (null == properties) {
                    properties = new Properties();
                }
                properties.put("log-level", 3);
                config.update(properties);
                System.out.println("Updated configuration to log level 3");
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
       
    }

--------------------------------------------------------------

The order in which I do these is that first I install and activate Logtest2 and then I install and enable LogConfigurator. The println at the top of the "updated()" method is never called when LogConfigurator is installed, which is consistent with the wrong bundle location that I get in LogConfigurator.

Thanks,
Ali.

P.S. the warning message that I mentioned earlier is when I reverse the order of installations.



Simon J Archer wrote:

Ali,

I think the problem you're having is one of ordering.  If your bundle starts before the ConfigurationAdmin service is registered then you're not going to find it. This is not a problem and is part of how OSGi works. There are a number of solutions:

1. Use Declarative Services (DS). This is by far the easiest approach since it removes the ordering problem entirely. I strongly recommend that you use DS.

2. Use the ServiceTracker to track the ConfigurationAdmin service.  This works in theory, but in practice is way harder to get right than you might imagine.

3. Register a ServiceListener to track the ConfigurationAdmin service. This also works in theory, but in practice is more work that you'd care to do.  It's debatable whether this is easier or harder than using the ServiceTracker.

See the attached zip that shows how to use DS to acquire a ConfigurationAdmin service.



I hope this helps,

Simon

From:	Ali Naddaf <ali@xxxxxxxxxx>
To:	Equinox development mailing list <equinox-dev@xxxxxxxxxxx>
Date:	09/28/2009 07:41 PM
Subject:	[equinox-dev] Working with ConfigAdmin service
Sent by:	equinox-dev-bounces@xxxxxxxxxxx

---

Hello everyone.

I am trying to write a few simple examples with ConfigurationAdmin
service to familiarize myself with it but have a difficulty obtaining a
pointer to the service. I am running Equinox 3.5 and have deployed
org.eclipse.equinox.cm_1.0.100 bundle in my framework but still when I
try to get a reference to the ConfiguartionAdmin (via
context.getServiceReference(ConfigurationAdmin.class.getName()) ), I get
a null pointer. Do I need to set any particular security settings?

Many thanks,
Ali.
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