[英]How do I use org.osgi.service.prefs.Preferences.clear()
[英]How do I use an osgi service in a dockable?
例如,如果我有一个通过注释用作可停靠窗口的类,我应该如何在该类中使用 osgi 服务? 最好将它作为私有成员字段。
你可以例如。 使用 ServiceTracker:
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceReference;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
...
@ViewDocking(...)
public class MyView extends SomeNode{
private final ServiceTracker<MyService, MyService> myServiceTracker;
private MyService myService;
public MyView(){
BundleContext bundleContext = FrameworkUtil.getBundle(MyView.class).getBundleContext();
myServiceTracker = new ServiceTracker<>(bundleContext, MyService.class,
new MyServiceTrackerCustomizer(bundleContext));
myServiceTracker.open(false);
}
...
public void setMyService(MyService myService) {
if (this.myService != null){
...
}
this.myService = myService;
if (this.myService != null){
...
}
}
...
private class MyServiceTrackerCustomizer implements
ServiceTrackerCustomizer<MyService, MyService> {
private final BundleContext context;
public MyServiceTrackerCustomizer(BundleContext context) {
this.context = context;
}
@Override
public MyService addingService(ServiceReference<MyService> reference) {
MyService myService = context.getService(reference);
setMyService(myService);
return myService;
}
@Override
public void modifiedService(ServiceReference<MyService> reference, MyService service) {
addingService(reference);
removedService(reference, service);
}
@Override
public void removedService(ServiceReference<MyService> reference, MyService service) {
setMyService(null);
context.ungetService(reference);
}
}
}
是否以及如何使用 CDI 也是一个悬而未决的问题。
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