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.cassandra.utils.binlog;
  
  import java.io.File; // checkstyle: permit this import
  import java.util.Queue;
  import java.util.concurrent.ConcurrentLinkedQueue;
  
  import com.google.common.annotations.VisibleForTesting;
  import com.google.common.base.Preconditions;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class DeletingArchiver implements BinLogArchiver
  {
      private static final Logger logger = LoggerFactory.getLogger(DeletingArchiver.class);
      /**
       * The files in the chronicle queue that have already rolled
       */
      private final Queue<File> chronicleStoreFiles = new ConcurrentLinkedQueue<>();
      private final long maxLogSize;
      /**
       * The number of bytes in store files that have already rolled
       */
      private long bytesInStoreFiles;
  
      public DeletingArchiver(long maxLogSize)
      {
          Preconditions.checkArgument(maxLogSize > 0, "maxLogSize must be > 0");
          this.maxLogSize = maxLogSize;
      }
  
      /**
       * Track store files as they are added and their storage impact. Delete them if over storage limit.
       * @param cycle
       * @param file
       */
      public synchronized void onReleased(int cycle, File file)
      {
          chronicleStoreFiles.offer(file);
          //This isn't accurate because the files are sparse, but it's at least pessimistic
          bytesInStoreFiles += file.length();
          logger.debug("Chronicle store file {} rolled file size {}", file.getPath(), file.length());
          while (bytesInStoreFiles > maxLogSize & !chronicleStoreFiles.isEmpty())
          {
              File toDelete = chronicleStoreFiles.poll();
              long toDeleteLength = toDelete.length();
              if (!toDelete.delete())
              {
                  logger.error("Failed to delete chronicle store file: {} store file size: {} bytes in store files: {}. " +
                               "You will need to clean this up manually or reset full query logging.",
                               toDelete.getPath(), toDeleteLength, bytesInStoreFiles);
              }
              else
              {
                  bytesInStoreFiles -= toDeleteLength;
                  logger.info("Deleted chronicle store file: {} store file size: {} bytes in store files: {} max log size: {}.",
                              file.getPath(), toDeleteLength, bytesInStoreFiles, maxLogSize);
              }
          }
      }
  
      @VisibleForTesting
      long getBytesInStoreFiles()
      {
          return bytesInStoreFiles;
      }
  
      public void stop()
      {
      }
  }
  