content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.table.common.udb;
  
  import alluxio.AlluxioURI;
  import alluxio.Constants;
  import alluxio.exception.AlluxioException;
  import alluxio.exception.InvalidPathException;
  import alluxio.grpc.CreateDirectoryPOptions;
  import alluxio.grpc.MountPOptions;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.Map;
  import java.util.Objects;
  
  /**
   * Udb related utils.
   */
  public class UdbUtils {
    private UdbUtils() {}
  
    private static final Logger LOG = LoggerFactory.getLogger(UdbUtils.class);
  
    /**
     * Mount ufs path to alluxio path.
     *
     * @param tableName Table name
     * @param ufsUri the uri of ufs
     * @param tableUri the alluxio uri for table
     * @param udbContext udb context
     * @param udbConfiguration Udb configurations
     * @return table uri
     * @throws IOException
     * @throws AlluxioException
     */
    public static String mountAlluxioPath(String tableName, AlluxioURI ufsUri, AlluxioURI tableUri,
        UdbContext udbContext, UdbConfiguration udbConfiguration)
        throws IOException, AlluxioException {
      if (Objects.equals(ufsUri.getScheme(), Constants.SCHEME)) {
        // already an alluxio uri, return the alluxio uri
        return ufsUri.toString();
      }
      try {
        tableUri = udbContext.getFileSystem().reverseResolve(ufsUri);
        LOG.debug("Trying to mount table {} location {}, but it is already mounted at location {}",
            tableName, ufsUri, tableUri);
        return tableUri.getPath();
      } catch (InvalidPathException e) {
        // ufs path not mounted, continue
      }
      // make sure the parent exists
      udbContext.getFileSystem().createDirectory(tableUri.getParent(),
          CreateDirectoryPOptions.newBuilder().setRecursive(true).setAllowExists(true).build());
      Map<String, String> mountOptionMap = udbConfiguration.getMountOption(
          String.format("%s://%s/", ufsUri.getScheme(), ufsUri.getAuthority().toString()));
      MountPOptions.Builder option = MountPOptions.newBuilder();
      for (Map.Entry<String, String> entry : mountOptionMap.entrySet()) {
        if (entry.getKey().equals(UdbConfiguration.READ_ONLY_OPTION)) {
          option.setReadOnly(Boolean.parseBoolean(entry.getValue()));
        } else if (entry.getKey().equals(UdbConfiguration.SHARED_OPTION)) {
          option.setShared(Boolean.parseBoolean(entry.getValue()));
        } else {
          option.putProperties(entry.getKey(), entry.getValue());
        }
      }
      udbContext.getFileSystem().mount(tableUri, ufsUri, option.build());
  
      LOG.info("mounted table {} location {} to Alluxio location {} with mountOption {}",
          tableName, ufsUri, tableUri, option.build());
      return tableUri.getPath();
    }
  }
  