restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/streams/listeners/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.listeners;
   9
  10 import java.time.Instant;
  11 import java.util.Optional;
  12 import org.eclipse.jdt.annotation.NonNull;
  13 import org.opendaylight.mdsal.dom.api.DOMEvent;
  14 import org.opendaylight.mdsal.dom.api.DOMNotification;
  15 import org.opendaylight.mdsal.dom.api.DOMNotificationListener;
  16 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
  17 import org.opendaylight.yangtools.yang.data.codec.gson.JSONCodecFactorySupplier;
  18 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  19 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * Abstract base class for functionality shared between {@link NotificationListenerAdapter} and
  24  * {@link DeviceNotificationListenerAdaptor}.
  25  */
  26 abstract class AbstractNotificationListenerAdaptor extends AbstractCommonSubscriber<DOMNotification>
  27         implements DOMNotificationListener {
  28     private static final Logger LOG = LoggerFactory.getLogger(AbstractNotificationListenerAdaptor.class);
  29     private static final NotificationFormatterFactory JSON_FORMATTER_FACTORY =
  30         JSONNotificationFormatter.createFactory(JSONCodecFactorySupplier.RFC7951);
  31
  32     AbstractNotificationListenerAdaptor(final String streamName, final NotificationOutputType outputType,
  33             final ListenersBroker listenersBroker) {
  34         super(streamName, outputType, getFormatterFactory(outputType), listenersBroker);
  35     }
  36
  37     private static NotificationFormatterFactory getFormatterFactory(final NotificationOutputType outputType) {
  38         return switch (outputType) {
  39             case JSON -> JSON_FORMATTER_FACTORY;
  40             case XML -> XMLNotificationFormatter.FACTORY;
  41         };
  42     }
  43
  44     @Override
  45     @SuppressWarnings("checkstyle:IllegalCatch")
  46     public final void onNotification(final DOMNotification notification) {
  47         final var eventInstant = notification instanceof DOMEvent domEvent ? domEvent.getEventInstant() : Instant.now();
  48         if (!checkStartStop(eventInstant)) {
  49             return;
  50         }
  51
  52         final Optional<String> maybeOutput;
  53         try {
  54             maybeOutput = formatter().eventData(effectiveModel(), notification, eventInstant);
  55         } catch (Exception e) {
  56             LOG.error("Failed to process notification {}", notification, e);
  57             return;
  58         }
  59         maybeOutput.ifPresent(this::post);
  60     }
  61
  62     abstract @NonNull EffectiveModelContext effectiveModel();
  63 }