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.master.file;
  
  import alluxio.AbstractMasterClient;
  import alluxio.Constants;
  import alluxio.grpc.FileSystemMasterWorkerServiceGrpc;
  import alluxio.grpc.GetFileInfoPRequest;
  import alluxio.grpc.GetUfsInfoPRequest;
  import alluxio.grpc.GrpcUtils;
  import alluxio.grpc.ServiceType;
  import alluxio.grpc.UfsInfo;
  import alluxio.master.MasterClientContext;
  import alluxio.wire.FileInfo;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * A wrapper for the gRPC client to interact with the file system master, used by Alluxio job
   * service.
   */
  @ThreadSafe
  public final class FileSystemMasterClient extends AbstractMasterClient {
    private static final Logger LOG = LoggerFactory.getLogger(FileSystemMasterClient.class);
    private FileSystemMasterWorkerServiceGrpc.FileSystemMasterWorkerServiceBlockingStub mClient =
            null;
  
    /**
     * Creates an instance of {@link FileSystemMasterClient}.
     *
     * @param conf master client configuration
     */
    public FileSystemMasterClient(MasterClientContext conf) {
      super(conf);
    }
  
    @Override
    protected ServiceType getRemoteServiceType() {
      return ServiceType.FILE_SYSTEM_MASTER_JOB_SERVICE;
    }
  
    @Override
    protected String getServiceName() {
      return Constants.FILE_SYSTEM_MASTER_JOB_SERVICE_NAME;
    }
  
    @Override
    protected long getServiceVersion() {
      return Constants.FILE_SYSTEM_MASTER_JOB_SERVICE_VERSION;
    }
  
    @Override
    protected void afterConnect() throws IOException {
      mClient = FileSystemMasterWorkerServiceGrpc.newBlockingStub(mChannel);
    }
  
    /**
     * @param fileId the id of the file for which to get the {@link FileInfo}
     * @return the file info for the given file id
     */
    public FileInfo getFileInfo(final long fileId) throws IOException {
      return retryRPC(() -> GrpcUtils.fromProto(mClient
          .getFileInfo(GetFileInfoPRequest.newBuilder().setFileId(fileId).build()).getFileInfo()),
          LOG, "GetFileInfo", "fileId=%d", fileId);
    }
  
    /**
     * @param mountId the id of the mount
     * @return the ufs information for the give ufs
     * @throws IOException if an I/O error occurs
     */
    public UfsInfo getUfsInfo(final long mountId) throws IOException {
      return retryRPC(() -> mClient
          .getUfsInfo(GetUfsInfoPRequest.newBuilder().setMountId(mountId).build()).getUfsInfo(),
          LOG, "GetUfsInfo", "mountId=%d", mountId);
    }
  }
  