Why not using bundle:watch ?
Regards
JB
On 08/26/2015 05:29 PM, sreeraaman wrote:
Dear All,
We have a requirement, wherein, all updates should happen automatically.
Our application is packaged as a custom karaf distro and run as a service in
the end-user environment. All the application specific bundles / features
are hosted in our nexus repo and the same is added to the
org.ops4j.pax.url.mvn.cfg file under the property
org.ops4j.pax.url.mvn.repositories. Hence, all bundle / feature resolution
will pickup our nexus repository.
Now, to enable an auto update for our application, we were thinking of the
following possibility.
Have a quartz scheduler that will run everyday at a pre-determined time and
trigger our AutoUpdater Service which is a SCR Component.
The component looks like this.
@Component(name="AppUpdater",provide=IAutoUpdater.class,immediate=true)
public class AutoUpdater implements IAutoUpdater{
//we inject the FeaturesService & MavenResolver (pax url aether)
FeaturesService featureService;
MavenResolver mavenResolver;
@Reference(service=MavenResolver.class,optional=false)
public void setMavenResolver(..){
..
}
@Reference(service=FeaturesService.class,optional=false)
public void setFeatureService(...){
..
}
The IAutoUpdater interface has a method with the following signature.
public void update(String[] featuresToUpdate);
In the implementation of the update method, we do the following:
public void update(String[] featuresToUpdate){
for (String feature:featuresToUpdate){
//Try to retrieve the feature by name
Feature f = featureService.getFeature(feature);
if (f != null) { // feature is already installed
//we build the feature url. for eg.
mvn:mygroupid/feature/LATEST/features/xml //feature name &
//artifact ids are the same.
String featureUrl = buildFeatureUrl(feature);
//This resolves and downloads the feature xml file
File file = mavenResolver.resolve(featureUrl);
//parse the xml to obtain the latest feature version.
String latestVersion = parseFeatureFile(file);
//compare the latestversion with the installed feature version.
if (!f.getVersion().equals(latestVersion)){
//feature requires an update.
//remove the current feature
featureService.uninstallFeature(feature);
//remove the repository as well
featureService.removeRepository(featureService.getRepositoryUriFor(feature,
f.getVersion()), true);
featureService.addRepository(file.toURI());
featureService.installFeature(feature);
else{
//you are already running the latest version of the feature. leave it as
it is.
}
}
}
}
}
Just wanted to understand if this is the right way of doing it or is there
any other approach that can be
adopted.
Note: MavenResolver is available only as of pax-url-aether 2.4.1.
This solution would work only on karaf 3.0.4 +.
best regards
Sriraman.
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--
Jean-Baptiste Onofré
jbono...@apache.org
http://blog.nanthrax.net
Talend - http://www.talend.com
