ambari-server/src/main/java/org/apache/ambari/server/stack/StackServiceDirectory.java

/**
 * 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.stack;

import org.apache.ambari.server.AmbariException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;


/**
 * Encapsulates IO operations on a stack service directory.
 */
public class StackServiceDirectory extends ServiceDirectory {

  /**
   * logger instance
   */
  private static final Logger LOG = LoggerFactory.getLogger(StackServiceDirectory.class);

  /**
   * Constructor.
   *
   * @param servicePath     path of the service directory
   * @throws org.apache.ambari.server.AmbariException if unable to parse the service directory
   */
  public StackServiceDirectory(String servicePath) throws AmbariException {
    super(servicePath);
  }

  @Override
  /**
   * Obtain the advisor name.
   *
   * @return advisor name
   */
  public String getAdvisorName(String serviceName) {
    if (getAdvisorFile() == null || serviceName == null)
      return null;

    File serviceDir = new File(getAbsolutePath());
    File stackVersionDir = serviceDir.getParentFile().getParentFile();
    File stackDir = stackVersionDir.getParentFile();

    String stackName = stackDir.getName();
    String versionString = stackVersionDir.getName().replaceAll("\\.", "");

    return stackName + versionString + serviceName + "ServiceAdvisor";
  }

  @Override
  /**
   * Calculate the stack service directories.
   * packageDir Format: stacks/<stackName>/<stackVersion>/services/<serviceName>/package
   * Example:
   *  directory: "/var/lib/ambari-server/resources/stacks/HDP/2.0.6/services/HDFS"
   *  packageDir: "stacks/HDP/2.0.6/services/HDFS/package"
   */
  protected void calculateDirectories() {
    File serviceDir = new File(getAbsolutePath());
    File stackVersionDir = serviceDir.getParentFile().getParentFile();
    File stackDir = stackVersionDir.getParentFile();

    String stackId = String.format("%s-%s", stackDir.getName(), stackVersionDir.getName());

    File absPackageDir = new File(getAbsolutePath() + File.separator + PACKAGE_FOLDER_NAME);
    if (absPackageDir.isDirectory()) {
      String[] files = absPackageDir.list();
      int fileCount = files.length;
      if (fileCount > 0) {
        packageDir = absPackageDir.getPath().substring(stackDir.getParentFile().getParentFile().getPath().length() + 1);
        LOG.debug("Service package folder for service %s for stack %s has been resolved to %s",
                serviceDir.getName(), stackId, packageDir);
      }
      else {
        LOG.debug("Service package folder %s for service %s for stack %s is empty.",
                absPackageDir, serviceDir.getName(), stackId);
      }
    } else {
      LOG.debug("Service package folder %s for service %s for stack %s does not exist.",
              absPackageDir, serviceDir.getName(), stackId);
    }

    File absUpgradesDir = new File(getAbsolutePath() + File.separator + UPGRADES_FOLDER_NAME);
    if (absUpgradesDir.isDirectory()) {
      String[] files = absUpgradesDir.list();
      int fileCount = files.length;
      if (fileCount > 0) {
        upgradesDir = absUpgradesDir;
        LOG.debug("Service upgrades folder for service %s for stack %s has been resolved to %s",
                serviceDir.getName(), stackId, packageDir);
      }
      else {
        LOG.debug("Service upgrades folder %s for service %s for stack %s is empty.",
                absUpgradesDir, serviceDir.getName(), stackId);
      }
    } else {
      LOG.debug("Service upgrades folder %s for service %s for stack %s does not exist.",
              absUpgradesDir, serviceDir.getName(), stackId);
    }
  }
}