public static boolean findServiceLater(
final ServiceBroker sb, final Class cl, final Object requestor, final Callback cb) {
final Object req = (requestor == null ? ServiceFinder.class : requestor);
if (sb.hasService(cl)) {
Service s = (Service) sb.getService(req, cl, null);
cb.foundService(s);
return true;
}
ServiceAvailableListener sal =
new ServiceAvailableListener() {
public void serviceAvailable(ServiceAvailableEvent ae) {
if (cl.isAssignableFrom(ae.getService())) {
Service s = (Service) sb.getService(req, cl, null);
cb.foundService(s);
// sb.removeServiceListener(this);
}
}
};
sb.addServiceListener(sal);
return false;
}
@Override
public void load() {
super.load();
// we want the servlet service, but it's loaded after the MTS.
// Also, we want the agent's proxy to the node-level
// ServletService. The blackboard is loaded late enough, so we
// wait 'til then...
if (sb.hasService(BlackboardService.class)) {
registerServlet();
} else {
ServiceAvailableListener sal =
new ServiceAvailableListener() {
public void serviceAvailable(ServiceAvailableEvent ae) {
Class<?> cl = ae.getService();
if (BlackboardService.class.isAssignableFrom(cl)) {
registerServlet();
}
}
};
sb.addServiceListener(sal);
}
}