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.hints;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.concurrent.ScheduledExecutors;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.service.StorageService;
  
  import static org.apache.cassandra.utils.Clock.Global.currentTimeMillis;
  
  /**
   * Delete the expired orphaned hints files.
   * An orphaned file is considered as no associating endpoint with its host ID.
   * An expired file is one that has lived longer than the largest gcgs of all tables.
   */
  final class HintsCleanupTrigger implements Runnable
  {
      private static final Logger logger = LoggerFactory.getLogger(HintsCleanupTrigger.class);
      private final HintsCatalog hintsCatalog;
      private final HintsDispatchExecutor dispatchExecutor;
  
      HintsCleanupTrigger(HintsCatalog catalog, HintsDispatchExecutor dispatchExecutor)
      {
          this.hintsCatalog = catalog;
          this.dispatchExecutor = dispatchExecutor;
      }
  
      public void run()
      {
          if (!DatabaseDescriptor.isAutoHintsCleanupEnabled())
              return;
  
          hintsCatalog.stores()
                      .filter(store -> StorageService.instance.getEndpointForHostId(store.hostId) == null)
                      .forEach(this::cleanup);
      }
  
      private void cleanup(HintsStore hintsStore)
      {
          logger.info("Found orphaned hints files for host: {}. Try to delete.", hintsStore.hostId);
  
          // The host ID has been replaced and the store is still writing hint for the old host
          if (hintsStore.isWriting())
              hintsStore.closeWriter();
  
          // Interrupt the dispatch if any. At this step, it is certain that the hintsStore is orphaned.
          dispatchExecutor.interruptDispatch(hintsStore.hostId);
          Runnable cleanup = () -> hintsStore.deleteExpiredHints(currentTimeMillis());
          ScheduledExecutors.optionalTasks.execute(cleanup);
      }
  }
  