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.client.meta;
  
  import alluxio.AbstractMasterClient;
  import alluxio.Constants;
  import alluxio.grpc.BackupPRequest;
  import alluxio.grpc.BackupStatusPRequest;
  import alluxio.grpc.CheckpointPOptions;
  import alluxio.grpc.GetConfigReportPOptions;
  import alluxio.grpc.GetMasterInfoPOptions;
  import alluxio.grpc.ListProxyStatusPRequest;
  import alluxio.grpc.MasterInfo;
  import alluxio.grpc.MasterInfoField;
  import alluxio.grpc.MetaMasterClientServiceGrpc;
  import alluxio.grpc.ProxyStatus;
  import alluxio.grpc.ServiceType;
  import alluxio.master.MasterClientContext;
  import alluxio.wire.BackupStatus;
  import alluxio.wire.ConfigCheckReport;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.util.List;
  import java.util.Set;
  import java.util.UUID;
  import javax.annotation.concurrent.ThreadSafe;
  
  /**
   * A wrapper for the gRPC client to interact with the meta master.
   */
  @ThreadSafe
  public class RetryHandlingMetaMasterClient extends AbstractMasterClient
      implements MetaMasterClient {
    private static final Logger RPC_LOG = LoggerFactory.getLogger(MetaMasterClient.class);
    private MetaMasterClientServiceGrpc.MetaMasterClientServiceBlockingStub mClient = null;
  
    /**
     * Creates a new meta master client.
     *
     * @param conf master client configuration
     */
    public RetryHandlingMetaMasterClient(MasterClientContext conf) {
      super(conf);
    }
  
    @Override
    protected ServiceType getRemoteServiceType() {
      return ServiceType.META_MASTER_CLIENT_SERVICE;
    }
  
    @Override
    protected String getServiceName() {
      return Constants.META_MASTER_CLIENT_SERVICE_NAME;
    }
  
    @Override
    protected long getServiceVersion() {
      return Constants.META_MASTER_CLIENT_SERVICE_VERSION;
    }
  
    @Override
    protected void afterConnect() {
      mClient = MetaMasterClientServiceGrpc.newBlockingStub(mChannel);
    }
  
    @Override
    public BackupStatus backup(BackupPRequest backupRequest) throws IOException {
      return retryRPC(() -> BackupStatus.fromProto(mClient.backup(backupRequest)),
          RPC_LOG, "Backup", "backupRequest=%s", backupRequest);
    }
  
    @Override
    public BackupStatus getBackupStatus(UUID backupId) throws IOException {
      return retryRPC(() -> BackupStatus.fromProto(mClient.getBackupStatus(
          BackupStatusPRequest.newBuilder().setBackupId(backupId.toString()).build())),
          RPC_LOG, "GetBackupStatus", "backupId=%s", backupId);
    }
  
    @Override
    public ConfigCheckReport getConfigReport() throws IOException {
      return retryRPC(() -> ConfigCheckReport.fromProto(
          mClient.getConfigReport(GetConfigReportPOptions.getDefaultInstance()).getReport()),
          RPC_LOG, "GetConfigReport", "");
    }
  
    @Override
    public MasterInfo getMasterInfo(final Set<MasterInfoField> fields)
        throws IOException {
      return retryRPC(() -> mClient
          .getMasterInfo(GetMasterInfoPOptions.newBuilder().addAllFilter(fields).build())
          .getMasterInfo(), RPC_LOG, "GetMasterInfo", "fields=%s", fields);
    }
  
    @Override
    public String checkpoint() throws IOException {
      return retryRPC(() -> mClient
          .checkpoint(CheckpointPOptions.newBuilder().build()).getMasterHostname(),
          RPC_LOG, "Checkpoint", "");
    }
  
    @Override
    public List<ProxyStatus> listProxyStatus() throws IOException {
      return retryRPC(() -> mClient.listProxyStatus(
          ListProxyStatusPRequest.getDefaultInstance()).getProxyStatusesList(),
          RPC_LOG, "ListProxyStatus", "");
    }
  }
  