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.metadata;
  
  import java.util.LinkedHashSet;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.state.Cluster;
  import org.apache.ambari.server.state.Clusters;
  import org.apache.commons.lang.builder.HashCodeBuilder;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.Inject;
  import com.google.inject.Injector;
  import com.google.inject.Singleton;
  
  /**
   * RoleCommandOrderProvider which caches RoleCommandOrder objects for a cluster to avoid the cost of construction of
   * RoleCommandOrder objects each time.
   */
  @Singleton
  public class CachedRoleCommandOrderProvider implements RoleCommandOrderProvider {
  
    private static final Logger LOG = LoggerFactory.getLogger(CachedRoleCommandOrderProvider.class);
  
    @Inject
    private Injector injector;
  
    @Inject
    private Clusters clusters;
  
    private Map<Integer, RoleCommandOrder> rcoMap = new ConcurrentHashMap<>();
  
    @Inject
    public CachedRoleCommandOrderProvider() {
    }
  
    @Override
    public RoleCommandOrder getRoleCommandOrder(Long clusterId) {
      Cluster cluster = null;
      try {
        cluster = clusters.getCluster(clusterId);
        return getRoleCommandOrder(cluster);
      } catch (AmbariException e) {
        return null;
      }
  
    }
  
    @Override
    public RoleCommandOrder getRoleCommandOrder(Cluster cluster) {
      boolean hasGLUSTERFS = false;
      boolean isNameNodeHAEnabled = false;
      boolean isResourceManagerHAEnabled = false;
  
      try {
        if (cluster != null && cluster.getService("GLUSTERFS") != null) {
          hasGLUSTERFS = true;
        }
      } catch (AmbariException ignored) {
      }
  
      try {
        if (cluster != null &&
          cluster.getService("HDFS") != null &&
          cluster.getService("HDFS").getServiceComponent("JOURNALNODE") != null) {
          isNameNodeHAEnabled = true;
        }
      } catch (AmbariException ignored) {
      }
  
      try {
        if (cluster != null &&
          cluster.getService("YARN") != null &&
          cluster.getService("YARN").getServiceComponent("RESOURCEMANAGER").getServiceComponentHosts().size() > 1) {
          isResourceManagerHAEnabled = true;
        }
      } catch (AmbariException ignored) {
      }
  
      int clusterCacheId = new HashCodeBuilder()
        .append(cluster != null ? cluster.getClusterId() : -1)
        .append(hasGLUSTERFS)
        .append(isNameNodeHAEnabled)
        .append(isResourceManagerHAEnabled)
        .toHashCode();
  
      RoleCommandOrder rco = rcoMap.get(clusterCacheId);
      if (rco == null) {
        rco = injector.getInstance(RoleCommandOrder.class);
  
        LinkedHashSet<String> sectionKeys = new LinkedHashSet<>();
  
        if (hasGLUSTERFS) {
          sectionKeys.add(RoleCommandOrder.GLUSTERFS_DEPS_KEY);
        } else {
          sectionKeys.add(RoleCommandOrder.NO_GLUSTERFS_DEPS_KEY);
        }
  
        if (isNameNodeHAEnabled) {
          sectionKeys.add(RoleCommandOrder.NAMENODE_HA_DEPS_KEY);
        }
  
        if (isResourceManagerHAEnabled) {
          sectionKeys.add(RoleCommandOrder.RESOURCEMANAGER_HA_DEPS_KEY);
        }
  
        rco.initialize(cluster, sectionKeys);
        rcoMap.put(clusterCacheId, rco);
      }
      return rco;
    }
  
    /**
     * Clear all entries - used after an upgrade
     */
    public void clearRoleCommandOrderCache() {
      rcoMap.clear();
    }
  }
  