restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/streams/AbstractNotificationListenerAdaptor.java

   1 /*
   2  * Copyright (c) 2022 PANTHEON.tech, s.r.o. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.restconf.nb.rfc8040.streams;
   9
  10 import java.time.Instant;
  11 import org.eclipse.jdt.annotation.NonNull;
  12 import org.opendaylight.mdsal.dom.api.DOMEvent;
  13 import org.opendaylight.mdsal.dom.api.DOMNotification;
  14 import org.opendaylight.mdsal.dom.api.DOMNotificationListener;
  15 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
  16 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
  17 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  18 import org.slf4j.Logger;
  19 import org.slf4j.LoggerFactory;
  20
  21 /**
  22  * Abstract base class for functionality shared between {@link NotificationListenerAdapter} and
  23  * {@link DeviceNotificationListenerAdaptor}.
  24  */
  25 abstract class AbstractNotificationListenerAdaptor extends AbstractCommonSubscriber<DOMNotification>
  26         implements DOMNotificationListener {
  27     private static final Logger LOG = LoggerFactory.getLogger(AbstractNotificationListenerAdaptor.class);
  28     private static final NotificationFormatterFactory JSON_FORMATTER_FACTORY =
  29         JSONNotificationFormatter.createFactory(JSONCodecFactorySupplier.RFC7951);
  30
  31     AbstractNotificationListenerAdaptor(final String streamName, final NotificationOutputType outputType,
  32             final ListenersBroker listenersBroker) {
  33         super(streamName, outputType, getFormatterFactory(outputType), listenersBroker);
  34     }
  35
  36     private static NotificationFormatterFactory getFormatterFactory(final NotificationOutputType outputType) {
  37         return switch (outputType) {
  38             case JSON -> JSON_FORMATTER_FACTORY;
  39             case XML -> XMLNotificationFormatter.FACTORY;
  40         };
  41     }
  42
  43     @Override
  44     @SuppressWarnings("checkstyle:IllegalCatch")
  45     public final void onNotification(final DOMNotification notification) {
  46         final var eventInstant = notification instanceof DOMEvent domEvent ? domEvent.getEventInstant() : Instant.now();
  47         final String data;
  48         try {
  49             data = formatter().eventData(effectiveModel(), notification, eventInstant);
  50         } catch (Exception e) {
  51             LOG.error("Failed to process notification {}", notification, e);
  52             return;
  53         }
  54         if (data != null) {
  55             post(data);
  56         }
  57     }
  58
  59     abstract @NonNull EffectiveModelContext effectiveModel();
  60 }