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 com.cloud.network.resource.wrapper;
  
  
  import com.cloud.agent.api.Answer;
  import com.cloud.agent.api.CheckHealthAnswer;
  import com.cloud.agent.api.CheckHealthCommand;
  import com.cloud.network.nicira.ControlClusterStatus;
  import com.cloud.network.nicira.NiciraNvpApi;
  import com.cloud.network.nicira.NiciraNvpApiException;
  import com.cloud.network.resource.NiciraNvpResource;
  import com.cloud.resource.CommandWrapper;
  import com.cloud.resource.ResourceWrapper;
  
  @ResourceWrapper(handles = CheckHealthCommand.class)
  public class NiciraCheckHealthCommandWrapper extends CommandWrapper<CheckHealthCommand, Answer, NiciraNvpResource> {
  
      private static final String CONTROL_CLUSTER_STATUS_IS_STABLE = "stable";
  
      @Override
      public Answer execute(final CheckHealthCommand command, final NiciraNvpResource serverResource) {
          final NiciraNvpApi niciraNvpApi = serverResource.getNiciraNvpApi();
          boolean healthy = true;
          try {
              final ControlClusterStatus clusterStatus = niciraNvpApi.getControlClusterStatus();
              final String status = clusterStatus.getClusterStatus();
              if (clusterIsUnstable(status)) {
                  logger.warn("Control cluster is not stable. Current status is " + status);
                  healthy = false;
              }
          } catch (final NiciraNvpApiException e) {
              logger.error("Exception caught while checking control cluster status during health check", e);
              healthy = false;
          }
  
          return new CheckHealthAnswer(command, healthy);
      }
  
      protected boolean clusterIsUnstable(final String clusterStatus) {
          return !CONTROL_CLUSTER_STATUS_IS_STABLE.equals(clusterStatus);
      }
  
  }
  