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.stack;
  
  import java.net.URI;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Set;
  import java.util.concurrent.Callable;
  
  import org.apache.ambari.server.stack.StackModule;
  import org.apache.ambari.server.state.RepositoryInfo;
  import org.apache.ambari.server.state.StackId;
  import org.apache.ambari.server.state.StackInfo;
  import org.apache.ambari.server.state.repository.VersionDefinitionXml;
  import org.apache.commons.collections4.MapUtils;
  import org.apache.commons.lang.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Encapsulates the work to resolve the latest repo information for a stack.
   * This class must be used AFTER the stack has created its owned repositories.
   */
  public class RepoVdfCallable implements Callable<Void> {
  
    private final static Logger LOG = LoggerFactory.getLogger(RepoVdfCallable.class);
  
    // !!! these are required for this callable to work
    private final StackInfo m_stack;
    private final OsFamily m_family;
    private final Map<String, URI> m_vdfMap;
  
    // !!! determines if this is for manifests or latest-vdf
    private String m_version;
  
    public RepoVdfCallable(StackModule stackModule,
        String version, Map<String, URI> vdfOsMap, OsFamily os_family) {
      m_stack = stackModule.getModuleInfo();
      m_family = os_family;
      m_version = version;
      m_vdfMap = vdfOsMap;
    }
  
    public RepoVdfCallable(StackModule stackModule,
        Map<String, URI> vdfOsMap, OsFamily os_family) {
      m_stack = stackModule.getModuleInfo();
      m_family = os_family;
      m_version = null;
      m_vdfMap = vdfOsMap;
    }
  
    @Override
    public Void call() throws Exception {
      if (MapUtils.isEmpty(m_vdfMap)) {
        return null;
      }
  
      boolean forLatest = (null == m_version);
  
      StackId stackId = new StackId(m_stack);
  
      VersionDefinitionXml xml = mergeDefinitions(stackId, m_version, m_vdfMap);
  
      if (null == xml) {
        return null;
      }
  
      if (forLatest) {
        xml.setStackDefault(true);
        m_stack.setLatestVersionDefinition(xml);
      } else {
        m_stack.addVersionDefinition(m_version, xml);
      }
  
      return null;
    }
  
    /**
     * Merges definitions loaded from the common file
     * @param stackId the stack id
     * @param version the version string
     * @param osMap   the map containing all the VDF for an OS
     * @return the merged version definition
     * @throws Exception
     */
    private VersionDefinitionXml mergeDefinitions(StackId stackId, String version,
        Map<String, URI> osMap) throws Exception {
  
      Set<String> oses = new HashSet<>();
      for (RepositoryInfo ri : m_stack.getRepositories()) {
        if (null != m_family.find(ri.getOsType())) {
          oses.add(m_family.find(ri.getOsType()));
        }
      }
  
      VersionDefinitionXml.Merger merger = new VersionDefinitionXml.Merger();
  
      for (Entry<String, URI> versionEntry : osMap.entrySet()) {
  
        String osFamily = m_family.find(versionEntry.getKey());
        URI uri = versionEntry.getValue();
  
        // !!! check for aliases.  Moving this to OsFamily could result in incorrect behavior
        if (null == osFamily) {
          String alias = m_family.getAliases().get(versionEntry.getKey());
          if (null != alias) {
            osFamily = m_family.find(alias);
          }
        }
  
        // !!! if the family is not known OR not part of the stack, skip
        if (null == osFamily || !oses.contains(osFamily)) {
          LOG.info("Stack {} cannot resolve OS {} to the supported ones: {}. Family: {}",
              stackId, versionEntry.getKey(), StringUtils.join(oses, ','), osFamily);
          continue;
        }
  
        try {
          VersionDefinitionXml xml = timedVDFLoad(uri);
  
          version = (null == version) ? xml.release.version : version;
          merger.add(version, xml);
  
        } catch (Exception e) {
          LOG.warn("Could not load version definition for {} identified by {}. {}",
              stackId, uri.toString(), e.getMessage(), e);
        }
      }
  
      return merger.merge();
    }
  
    private VersionDefinitionXml timedVDFLoad(URI uri) throws Exception {
      long time = System.currentTimeMillis();
  
      try {
        return VersionDefinitionXml.load(uri.toURL());
      } finally {
        LOG.debug("Loaded VDF {} in {}ms", uri, System.currentTimeMillis() - time);
      }
  
    }
  
  }
  