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.db.compaction;
  
  import java.util.AbstractCollection;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.stream.Collectors;
  
  import org.apache.cassandra.utils.FBUtilities;
  
  public class CompactionTasks extends AbstractCollection<AbstractCompactionTask> implements AutoCloseable
  {
      private static final CompactionTasks EMPTY = new CompactionTasks(Collections.emptyList());
  
      private final Collection<AbstractCompactionTask> tasks;
  
      private CompactionTasks(Collection<AbstractCompactionTask> tasks)
      {
          this.tasks = tasks;
      }
  
      public static CompactionTasks create(Collection<AbstractCompactionTask> tasks)
      {
          if (tasks == null || tasks.isEmpty())
              return EMPTY;
          return new CompactionTasks(tasks);
      }
  
      public static CompactionTasks empty()
      {
          return EMPTY;
      }
  
      public Iterator<AbstractCompactionTask> iterator()
      {
          return tasks.iterator();
      }
  
      public int size()
      {
          return tasks.size();
      }
  
      public void close()
      {
          try
          {
              FBUtilities.closeAll(tasks.stream().map(task -> task.transaction).collect(Collectors.toList()));
          }
          catch (Exception e)
          {
              throw new RuntimeException(e);
          }
      }
  }
  