restconf/restconf-nb/src/main/java/org/opendaylight/restconf/nb/rfc8040/rests/services/impl/RestconfDataStreamServiceImpl.java

   1 /*
   2  * Copyright (c) 2020 Lumina Networks, Inc. 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.rests.services.impl;
   9
  10 import java.util.concurrent.ScheduledExecutorService;
  11 import javax.inject.Inject;
  12 import javax.inject.Singleton;
  13 import javax.ws.rs.core.UriInfo;
  14 import javax.ws.rs.sse.Sse;
  15 import javax.ws.rs.sse.SseEventSink;
  16 import org.opendaylight.controller.config.threadpool.ScheduledThreadPool;
  17 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  18 import org.opendaylight.restconf.nb.rfc8040.rests.services.api.RestconfDataStreamService;
  19 import org.opendaylight.restconf.nb.rfc8040.rests.utils.RestconfStreamsConstants;
  20 import org.opendaylight.restconf.nb.rfc8040.streams.Configuration;
  21 import org.opendaylight.restconf.nb.rfc8040.streams.SSESessionHandler;
  22 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.BaseListenerInterface;
  23 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.ListenersBroker;
  24 import org.opendaylight.yangtools.yang.common.ErrorTag;
  25 import org.opendaylight.yangtools.yang.common.ErrorType;
  26 import org.slf4j.Logger;
  27 import org.slf4j.LoggerFactory;
  28
  29 /**
  30  * Implementation of {@link RestconfDataStreamService}.
  31  */
  32 @Singleton
  33 public class RestconfDataStreamServiceImpl implements RestconfDataStreamService {
  34     private static final Logger LOG = LoggerFactory.getLogger(RestconfDataStreamServiceImpl.class);
  35
  36     private final ListenersBroker listenersBroker = ListenersBroker.getInstance();
  37     private final ScheduledExecutorService executorService;
  38     private final int maximumFragmentLength;
  39     private final int heartbeatInterval;
  40
  41     @Inject
  42     public RestconfDataStreamServiceImpl(final ScheduledThreadPool scheduledThreadPool,
  43             final Configuration configuration) {
  44         executorService = scheduledThreadPool.getExecutor();
  45         heartbeatInterval = configuration.getHeartbeatInterval();
  46         maximumFragmentLength = configuration.getMaximumFragmentLength();
  47     }
  48
  49     @Override
  50     public void getSSE(final String identifier, final UriInfo uriInfo, final SseEventSink sink, final Sse sse) {
  51         final String streamName = ListenersBroker.createStreamNameFromUri(identifier);
  52         final BaseListenerInterface listener;
  53         final String notificaionType =
  54             uriInfo.getQueryParameters().getFirst(RestconfStreamsConstants.NOTIFICATION_TYPE);
  55         if (notificaionType != null && notificaionType.equals(RestconfStreamsConstants.DEVICE)) {
  56             listener = listenersBroker.deviceNotificationListenerFor(streamName);
  57             if (listener == null) {
  58                 LOG.debug("Listener for device path with name {} was not found.", streamName);
  59                 throw new RestconfDocumentedException("Data missing", ErrorType.APPLICATION, ErrorTag.DATA_MISSING);
  60             }
  61         } else {
  62             listener = listenersBroker.listenerFor(streamName);
  63             if (listener == null) {
  64                 LOG.debug("Listener for stream with name {} was not found.", streamName);
  65                 throw new RestconfDocumentedException("Data missing", ErrorType.APPLICATION, ErrorTag.DATA_MISSING);
  66             }
  67         }
  68
  69         LOG.debug("Listener for stream with name {} has been found, SSE session handler will be created.", streamName);
  70         // FIXME: invert control here: we should call 'listener.addSession()', which in turn should call
  71         //        handler.init()/handler.close()
  72         final SSESessionHandler handler = new SSESessionHandler(executorService, sink, sse, listener,
  73             maximumFragmentLength, heartbeatInterval);
  74         handler.init();
  75     }
  76 }