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.underfs;
  
  import alluxio.AlluxioURI;
  import alluxio.ClientContext;
  import alluxio.conf.Configuration;
  import alluxio.exception.status.NotFoundException;
  import alluxio.exception.status.UnavailableException;
  import alluxio.grpc.UfsInfo;
  import alluxio.master.MasterClientContext;
  import alluxio.util.network.NetworkAddressUtils;
  import alluxio.worker.file.FileSystemMasterClient;
  
  import com.google.common.base.Preconditions;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * The default implementation of UfsManager to manage the ufs used by different worker services.
   */
  @ThreadSafe
  public final class WorkerUfsManager extends AbstractUfsManager {
    private static final Logger LOG = LoggerFactory.getLogger(WorkerUfsManager.class);
  
    private final FileSystemMasterClient mMasterClient;
  
    /**
     * Constructs an instance of {@link WorkerUfsManager}.
     */
    public WorkerUfsManager() {
      mMasterClient = mCloser.register(new FileSystemMasterClient(MasterClientContext
          .newBuilder(ClientContext.create(Configuration.global())).build()));
    }
  
    /**
     * {@inheritDoc}.
     *
     * If this mount id is new to this worker, this method will query master to get the
     * corresponding ufs info.
     */
    @Override
    public UfsClient get(long mountId) throws NotFoundException, UnavailableException {
      try {
        return super.get(mountId);
      } catch (NotFoundException e) {
        // Not cached locally, let's query master
      }
  
      UfsInfo info;
      try {
        info = mMasterClient.getUfsInfo(mountId);
      } catch (IOException e) {
        throw new UnavailableException(
            String.format("Failed to create UFS info for mount point with id %d", mountId), e);
      }
      Preconditions.checkState((info.hasUri() && info.hasProperties()), "unknown mountId");
      super.addMount(mountId, new AlluxioURI(info.getUri()),
          new UnderFileSystemConfiguration(
              Configuration.global(), info.getProperties().getReadOnly())
              .createMountSpecificConf(info.getProperties().getPropertiesMap()));
      return super.get(mountId);
    }
  
    @Override
    protected void connectUfs(UnderFileSystem fs) throws IOException {
      fs.connectFromWorker(
          NetworkAddressUtils.getConnectHost(NetworkAddressUtils.ServiceType.WORKER_RPC,
              Configuration.global()));
    }
  }
  