X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=opendaylight%2Fmd-sal%2Fsal-binding-api%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fsal%2Fbinding%2Fapi%2FNotificationService.java;h=335f55bcbbade9ce84898eafee05ff146ef2d382;hb=919145b1bf7d68e436efa9b22c174965005a174a;hp=46e372aea652e29439408da9b6d1ccc963e86acc;hpb=5135f2d97f0886632f3ad3b7160a3be54909810f;p=controller.git diff --git a/opendaylight/md-sal/sal-binding-api/src/main/java/org/opendaylight/controller/sal/binding/api/NotificationService.java b/opendaylight/md-sal/sal-binding-api/src/main/java/org/opendaylight/controller/sal/binding/api/NotificationService.java index 46e372aea6..335f55bcbb 100644 --- a/opendaylight/md-sal/sal-binding-api/src/main/java/org/opendaylight/controller/sal/binding/api/NotificationService.java +++ b/opendaylight/md-sal/sal-binding-api/src/main/java/org/opendaylight/controller/sal/binding/api/NotificationService.java @@ -10,24 +10,108 @@ package org.opendaylight.controller.sal.binding.api; import org.opendaylight.yangtools.concepts.ListenerRegistration; import org.opendaylight.yangtools.yang.binding.Notification; +/** + * Notification broker which allows clients to subscribe for and publish YANG-modeled notifications. + * + *
+ * Two styles of listeners are supported: + *
{ModelName}Listener
interface,
+ * which has dispatch methods for each defined notification. Methods are invoked based on notification type (class).
+ *
+ * A generic listener implements the {@link NotificationListener} interface which has one callback method
+ * onNotification
that is invoked for any notification type the listener is subscribed to.
+ *
+ * A generic listener is subscribed using the {@link #registerNotificationListener(Class, NotificationListener)} + * method by which you specify the type of notification to receive. A generic listener may be registered for + * multiple notification types via multiple subscriptions. + *
+ * Generic listeners allow for a more flexible approach, allowing you to subscribe for just + * one type of notification from a YANG model. You could also have a general subscription + * for all notification in the system via + *
+ * service.registerNotificationListener(Notification.class, listener); + *+ * + *
+ * A dispatch listener implements a YANG-generated module interface {ModuleName}Listener
+ * which handles all the notifications defined in the YANG model. Each notification type translates to
+ * a specific method of the form on{NotificationType}
on the generated interface.
+ * The generated interface also extends the
+ * {@link org.opendaylight.yangtools.yang.binding.NotificationListener} interface and implementations
+ * are registered using {@link #registerNotificationListener(org.opendaylight.yangtools.yang.binding.NotificationListener)}
+ * method.
+ *
+ *
+ * Lets assume we have following YANG model: + * + *
+ * module example { + * ... + * + * notification start { + * ... + * } + * + * notification stop { + * ... + * } + * } + *+ * + * The generated interface will be: + *
+ * public interface ExampleListener extends NotificationListener { + * void onStart(Start notification); + * void onStop(Stop notification); + * } + *+ * The following defines an implementation of the generated interface: + *
+ * public class MyExampleListener implements ExampleListener { + * public void onStart(Start notification) { + * // do something + * } + * + * public void onStop(Stop notification) { + * // do something + * } + * } + *+ * The implementation is registered as follows: + *
+ * MyExampleListener listener = new MyExampleListener(); + * ListenerRegistration+ * Thereg = service.registerNotificationListener( listener ); + *
onStart
method will be invoked when someone publishes a Start
notification and
+ * the onStop
method will be invoked when someone publishes a Stop
notification.
+ */
public interface NotificationService extends BindingAwareService {
/**
- * Register a generic listener for specified notification type only.
+ * Registers a generic listener implementation for a specified notification type.
*
- * @param notificationType
- * @param listener
- * @return Registration for listener. To unregister listener invoke {@link ListenerRegistration#close()} method.
+ * @param notificationType the YANG-generated interface of the notification type.
+ * @param listener the listener implementation that will receive notifications.
+ * @return a {@link ListenerRegistration} instance that should be used to unregister the listener
+ * by invoking the {@link ListenerRegistration#close()} method when no longer needed.
*/