hi,
When implementing the LDAP carbon component I got the requirement to deploy
the LDAP carbon component before
User core component. The other requirement was that the User core component
should wait only if the LDAP component present.
There was a similar work done by Sameera to deploy Axis2 bundle and Axis2
modules before the carbon core. So I used the same
method but implemented it in a generic manner so that any one can use it.
The only thing I wrote was a bundle Activator which can be extended by any
component which need others to start before it.
public abstract class BundleCheckActivator implements BundleActivator {
private static final Log log =
LogFactory.getLog(BundleCheckActivator.class);
private String DEPLOY_BEFORE_PREFIX = "DeployBefore";
public void start(final BundleContext bundleContext) throws Exception {
// check for the services should deploy before this if there exists.
// if there are such services we wait for such bundles to deploy and
gets the notification
// through a service listner.
// first check whether there are such services and they have already
deployed.
String requiredItem = null;
final List<String> pendingBundles = new ArrayList<String>();
for (Bundle bundle : bundleContext.getBundles()) {
requiredItem = (String)
bundle.getHeaders().get(DEPLOY_BEFORE_PREFIX + getName());
if ((requiredItem != null) && (bundle.getState() !=
Bundle.ACTIVE)) {
// i.e this bundle should start before the user manager but
yet has not started
pendingBundles.add(requiredItem);
}
}
if (pendingBundles.isEmpty()) {
startDeploy(bundleContext);
} else {
BundleListener bundleListener = new BundleListener() {
public void bundleChanged(BundleEvent bundleEvent) {
synchronized (pendingBundles) {
if (bundleEvent.getType() == BundleEvent.STARTED) {
String requiredItem =
(String)
bundleEvent.getBundle().getHeaders().get(DEPLOY_BEFORE_PREFIX + getName());
pendingBundles.remove(requiredItem);
if (pendingBundles.isEmpty()) {
// now start the deployment
bundleContext.removeBundleListener(this);
try {
startDeploy(bundleContext);
} catch (Exception e) {
log.error("Can not start the bundle ",
e);
}
}
}
}
}
};
bundleContext.addBundleListener(bundleListener);
}
}
public abstract void startDeploy(BundleContext bundleContext) throws
Exception;
public abstract String getName();
}
here in the actual Activator code can implement the startBundle method and
should give a name for that bundle.
Then any module which should before this bundle should have a header with
name -- DeployBefore + bundleName
eg. For ldap component this can be done by adding following entry to pom.xml
<DeployBeforeUserCore>directoryServer</DeployBeforeUserCore>
thanks,
Amila.
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