content: /*
   * 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.bookkeeper.statelib.impl.rocksdb.checkpoint;
  
  import java.io.File;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Paths;
  import java.time.Duration;
  import java.util.List;
  import java.util.concurrent.TimeoutException;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.statelib.api.checkpoint.CheckpointStore;
  import org.apache.bookkeeper.statelib.api.exceptions.StateStoreException;
  import org.apache.bookkeeper.stream.proto.kv.store.CheckpointMetadata;
  
  /**
   * A task that restore a rocksdb instance.
   */
  @Slf4j
  public class RocksdbRestoreTask {
  
      private final String dbName;
      private final File checkpointDir;
      private final CheckpointStore checkpointStore;
      private final String dbPrefix;
      private final Duration idleWait;
  
      public RocksdbRestoreTask(String dbName,
                                File checkpointDir,
                                CheckpointStore checkpointStore) {
          this(dbName, checkpointDir, checkpointStore, Duration.ofMinutes(5));
      }
  
      public RocksdbRestoreTask(String dbName,
                                File checkpointDir,
                                CheckpointStore checkpointStore,
                                Duration idleWait) {
          this.dbName = dbName;
          this.checkpointDir = checkpointDir;
          this.checkpointStore = checkpointStore;
          this.dbPrefix = String.format("%s", dbName);
          this.idleWait = idleWait;
      }
  
      public void restore(String checkpointId, CheckpointMetadata metadata) throws StateStoreException, TimeoutException {
          File checkpointedDir = new File(checkpointDir, checkpointId);
  
          try {
  
              if (!checkpointedDir.exists()) {
                  Files.createDirectories(
                          Paths.get(checkpointedDir.getAbsolutePath()));
              }
              List<CheckpointFile> files = getCheckpointFiles(checkpointedDir, metadata);
              copyFilesFromRemote(checkpointId, files);
          } catch (IOException ioe) {
              log.error("Failed to restore checkpoint {} to local directory {}",
                  new Object[] { checkpointId, checkpointedDir, ioe });
              throw new StateStoreException(
                  "Failed to restore checkpoint " + checkpointId + " to local directory " + checkpointedDir,
                  ioe);
          }
      }
  
      protected List<CheckpointFile> getCheckpointFiles(File checkpointedDir, CheckpointMetadata metadata) {
          return CheckpointFile.list(checkpointedDir, metadata);
      }
  
      private void copyFilesFromRemote(String checkpointId,
                                       List<CheckpointFile> remoteFiles) throws IOException, TimeoutException {
          for (CheckpointFile file : remoteFiles) {
              file.copyFromRemote(checkpointStore, dbPrefix, checkpointId, idleWait);
          }
      }
  }
  