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