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 org.glassfish.jersey.media.sse.EventOutput;
  16 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  17 import org.opendaylight.restconf.common.errors.RestconfError.ErrorTag;
  18 import org.opendaylight.restconf.common.errors.RestconfError.ErrorType;
  19 import org.opendaylight.restconf.nb.rfc8040.rests.services.api.RestconfDataStreamService;
  20 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.BaseListenerInterface;
  21 import org.opendaylight.restconf.nb.rfc8040.streams.listeners.ListenersBroker;
  22 import org.opendaylight.restconf.nb.rfc8040.streams.sse.SSEInitializer;
  23 import org.opendaylight.restconf.nb.rfc8040.streams.sse.SSESessionHandler;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 /**
  28  * Implementation of {@link RestconfDataStreamService}.
  29  */
  30 @Singleton
  31 public class RestconfDataStreamServiceImpl implements RestconfDataStreamService {
  32     private static final Logger LOG = LoggerFactory.getLogger(RestconfDataStreamServiceImpl.class);
  33
  34     private final ListenersBroker listenersBroker = ListenersBroker.getInstance();
  35     private final ScheduledExecutorService executorService;
  36     private final int maximumFragmentLength;
  37     private final int heartbeatInterval;
  38
  39     @Inject
  40     public RestconfDataStreamServiceImpl(final SSEInitializer configuration) {
  41         executorService = configuration.getExecutorService();
  42         heartbeatInterval = configuration.getHeartbeatInterval();
  43         maximumFragmentLength = configuration.getMaximumFragmentLength();
  44     }
  45
  46     @Override
  47     public EventOutput getSSE(final String identifier, final UriInfo uriInfo) {
  48         final String streamName = ListenersBroker.createStreamNameFromUri(identifier);
  49         final Optional<BaseListenerInterface> listener = listenersBroker.getListenerFor(streamName);
  50
  51         if (listener.isEmpty()) {
  52             LOG.debug("Listener for stream with name {} was not found.", streamName);
  53             throw new RestconfDocumentedException("Data missing", ErrorType.APPLICATION, ErrorTag.DATA_MISSING);
  54         }
  55
  56         LOG.debug("Listener for stream with name {} has been found, SSE session handler will be created.", streamName);
  57         final EventOutput eventOutput = new EventOutput();
  58         final SSESessionHandler handler = new SSESessionHandler(executorService, eventOutput, listener.get(),
  59             maximumFragmentLength, heartbeatInterval);
  60         handler.init();
  61         return eventOutput;
  62     }
  63 }