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.state;
  
  import static java.util.stream.Collectors.toSet;
  import static org.apache.commons.collections4.CollectionUtils.union;
  
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Set;
  
  import org.apache.ambari.server.AmbariException;
  import org.apache.ambari.server.StackAccessException;
  import org.apache.ambari.server.api.services.AmbariMetaInfo;
  
  import com.google.inject.Inject;
  import com.google.inject.Provider;
  import com.google.inject.Singleton;
  
  /**
   * Collects services and components which are installed but not supported in the target stack
   */
  @Singleton
  public class ServiceComponentSupport {
    private final Provider<AmbariMetaInfo> metaInfo;
  
    @Inject
    public ServiceComponentSupport(Provider<AmbariMetaInfo> metaInfo) {
      this.metaInfo = metaInfo;
    }
  
    /**
     * Collects the service names from the cluster which are not supported (service doesn't exist or was deleted) in the given stack.
     */
    public Set<String> unsupportedServices(Cluster cluster, String stackName, String stackVersion) {
      return cluster.getServices().keySet().stream()
        .filter(serviceName -> !isServiceSupported(serviceName, stackName, stackVersion))
        .collect(toSet());
    }
  
    /**
     * Checks if the service is supported by the stack using metainfo
     */
    public boolean isServiceSupported(String serviceName, String stackName, String stackVersion) {
      try {
        ServiceInfo service = metaInfo.get().getServices(stackName, stackVersion).get(serviceName);
        return service != null && !service.isDeleted();
      } catch (AmbariException e) {
        throw new RuntimeException(e);
      }
    }
  
    /**
     * Collects the ServiceComponents from the cluster which are not supported (component doesn't exist or was deleted) in the given stack.
     * Non versionAdvertised components are ignored.
     */
    public Set<ServiceComponent> unsupportedComponents(Cluster cluster, String stackName, String stackVersion) throws AmbariException {
  
      Set<ServiceComponent> unsupportedComponents = new HashSet<>();
      for (Service service : cluster.getServices().values()) {
        for (ServiceComponent component : service.getServiceComponents().values()) {
          if (!component.isVersionAdvertised())
            continue;
          if (!isComponentSupported(service.getName(), component.getName(), stackName, stackVersion)) {
            unsupportedComponents.add(component);
          }
        }
      }
      return unsupportedComponents;
    }
  
    private boolean isComponentSupported(String serviceName, String componentName, String stackName, String stackVersion) throws AmbariException {
      try {
        ComponentInfo component = metaInfo.get().getComponent(stackName, stackVersion, serviceName, componentName);
        return !component.isDeleted();
      } catch (StackAccessException e) {
        return false;
      }
    }
  
    /**
     * @return the union of unsupported components and services
     */
    public Collection<String> allUnsupported(Cluster cluster, String stackName, String stackVersion) throws AmbariException {
      return union(
        unsupportedServices(cluster, stackName, stackVersion),
        names(unsupportedComponents(cluster, stackName, stackVersion)));
    }
  
    private Set<String> names(Set<ServiceComponent> serviceComponents) {
      return serviceComponents.stream().map(each -> each.getName()).collect(toSet());
    }
  }
  