content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.ambari.server.events.publishers;
  
  import java.util.List;
  import java.util.stream.Collectors;
  
  import org.apache.ambari.server.EagerSingleton;
  import org.apache.ambari.server.events.HostComponentUpdate;
  import org.apache.ambari.server.events.HostComponentsUpdateEvent;
  import org.apache.ambari.server.events.STOMPEvent;
  
  import com.google.common.eventbus.EventBus;
  import com.google.inject.Inject;
  
  @EagerSingleton
  public class HostComponentUpdateEventPublisher extends BufferedUpdateEventPublisher<HostComponentsUpdateEvent> {
  
    @Inject
    public HostComponentUpdateEventPublisher(STOMPUpdatePublisher stompUpdatePublisher) {
      super(stompUpdatePublisher);
    }
  
    @Override
    public STOMPEvent.Type getType() {
      return STOMPEvent.Type.HOSTCOMPONENT;
    }
  
    @Override
    public void mergeBufferAndPost(List<HostComponentsUpdateEvent> events, EventBus m_eventBus) {
      List<HostComponentUpdate> hostComponentUpdates = events.stream().flatMap(
          u -> u.getHostComponentUpdates().stream()).collect(Collectors.toList());
  
      HostComponentsUpdateEvent resultEvents = new HostComponentsUpdateEvent(hostComponentUpdates);
      //TODO add logging and metrics posting
      m_eventBus.post(resultEvents);
    }
  }
  