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.agent.stomp;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.agent.AgentSessionManager;
  import org.apache.ambari.server.agent.stomp.dto.Hash;
  import org.apache.ambari.server.events.AgentConfigsUpdateEvent;
  import org.apache.ambari.server.events.AlertDefinitionsAgentUpdateEvent;
  import org.apache.ambari.server.events.HostLevelParamsUpdateEvent;
  import org.apache.ambari.server.events.MetadataUpdateEvent;
  import org.apache.ambari.server.events.TopologyUpdateEvent;
  import org.apache.ambari.server.state.fsm.InvalidStateTransitionException;
  import org.springframework.messaging.handler.annotation.Header;
  import org.springframework.messaging.handler.annotation.MessageMapping;
  import org.springframework.messaging.simp.annotation.SendToUser;
  import org.springframework.stereotype.Controller;
  
  import com.google.inject.Injector;
  
  @Controller
  @SendToUser("/")
  @MessageMapping("/agents")
  public class AgentCurrentDataController {
  
    private final AgentSessionManager agentSessionManager;
    private final TopologyHolder topologyHolder;
    private final MetadataHolder metadataHolder;
    private final HostLevelParamsHolder hostLevelParamsHolder;
    private final AgentConfigsHolder agentConfigsHolder;
    private final AlertDefinitionsHolder alertDefinitionsHolder;
  
    public AgentCurrentDataController(Injector injector) {
      agentSessionManager = injector.getInstance(AgentSessionManager.class);
      topologyHolder = injector.getInstance(TopologyHolder.class);
      metadataHolder = injector.getInstance(MetadataHolder.class);
      hostLevelParamsHolder = injector.getInstance(HostLevelParamsHolder.class);
      agentConfigsHolder = injector.getInstance(AgentConfigsHolder.class);
      alertDefinitionsHolder = injector.getInstance(AlertDefinitionsHolder.class);
    }
  
    @MessageMapping("/topologies")
    public TopologyUpdateEvent getCurrentTopology(Hash hash) throws AmbariException, InvalidStateTransitionException {
      return topologyHolder.getUpdateIfChanged(hash.getHash());
    }
  
    @MessageMapping("/metadata")
    public MetadataUpdateEvent getCurrentMetadata(Hash hash) throws AmbariException {
      return metadataHolder.getUpdateIfChanged(hash.getHash());
    }
  
    @MessageMapping("/alert_definitions")
    public AlertDefinitionsAgentUpdateEvent getAlertDefinitions(@Header String simpSessionId, Hash hash) throws AmbariException {
      Long hostId = agentSessionManager.getHost(simpSessionId).getHostId();
      return alertDefinitionsHolder.getUpdateIfChanged(hash.getHash(), hostId);
    }
  
    @MessageMapping("/configs")
    public AgentConfigsUpdateEvent getCurrentConfigs(@Header String simpSessionId, Hash hash) throws AmbariException {
      return agentConfigsHolder.getUpdateIfChanged(hash.getHash(), agentSessionManager.getHost(simpSessionId).getHostId());
    }
  
    @MessageMapping("/host_level_params")
    public HostLevelParamsUpdateEvent getCurrentHostLevelParams(@Header String simpSessionId, Hash hash) throws AmbariException {
      return hostLevelParamsHolder.getUpdateIfChanged(hash.getHash(), agentSessionManager.getHost(simpSessionId).getHostId());
    }
  
  }
  