restconf/restconf-nb-rfc8040/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.Optional;
  11 import java.util.concurrent.ScheduledExecutorService;
  12 import javax.inject.Inject;
  13 import javax.inject.Singleton;
  14 import javax.ws.rs.core.UriInfo;
  15 import javax.ws.rs.sse.Sse;
  16 import javax.ws.rs.sse.SseEventSink;
  17 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  18 import org.opendaylight.restconf.common.errors.RestconfError.ErrorTag;
  19 import org.opendaylight.restconf.common.errors.RestconfError.ErrorType;
  20 import org.opendaylight.restconf.nb.rfc8040.rests.services.api.RestconfDataStreamService;
  21 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.BaseListenerInterface;
  22 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.ListenersBroker;
  23 import org.opendaylight.restconf.nb.rfc8040.streams.sse.SSEInitializer;
  24 import org.opendaylight.restconf.nb.rfc8040.streams.sse.SSESessionHandler;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 /**
  29  * Implementation of {@link RestconfDataStreamService}.
  30  */
  31 @Singleton
  32 public class RestconfDataStreamServiceImpl implements RestconfDataStreamService {
  33     private static final Logger LOG = LoggerFactory.getLogger(RestconfDataStreamServiceImpl.class);
  34
  35     private final ListenersBroker listenersBroker = ListenersBroker.getInstance();
  36     private final ScheduledExecutorService executorService;
  37     private final int maximumFragmentLength;
  38     private final int heartbeatInterval;
  39
  40     @Inject
  41     public RestconfDataStreamServiceImpl(final SSEInitializer configuration) {
  42         executorService = configuration.getExecutorService();
  43         heartbeatInterval = configuration.getHeartbeatInterval();
  44         maximumFragmentLength = configuration.getMaximumFragmentLength();
  45     }
  46
  47     @Override
  48     public void getSSE(final String identifier, final UriInfo uriInfo, final SseEventSink sink, final Sse sse) {
  49         final String streamName = ListenersBroker.createStreamNameFromUri(identifier);
  50         final Optional<BaseListenerInterface> listener = listenersBroker.getListenerFor(streamName);
  51
  52         if (listener.isEmpty()) {
  53             LOG.debug("Listener for stream with name {} was not found.", streamName);
  54             throw new RestconfDocumentedException("Data missing", ErrorType.APPLICATION, ErrorTag.DATA_MISSING);
  55         }
  56
  57         LOG.debug("Listener for stream with name {} has been found, SSE session handler will be created.", streamName);
  58
  59         // FIXME: invert control here: we should call 'listener.addSession()', which in turn should call
  60         //        handler.init()/handler.close()
  61         final SSESessionHandler handler = new SSESessionHandler(executorService, sink, sse, listener.get(),
  62             maximumFragmentLength, heartbeatInterval);
  63         handler.init();
  64     }
  65 }