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.io.sstable;
  
  import java.util.Collection;
  import java.util.Set;
  
  import com.google.common.base.Throwables;
  
  import org.apache.cassandra.db.partitions.UnfilteredPartitionIterator;
  import org.apache.cassandra.io.sstable.format.SSTableReader;
  import org.apache.cassandra.utils.JVMStabilityInspector;
  
  /**
   * An ISSTableScanner is an abstraction allowing multiple SSTableScanners to be
   * chained together under the hood.  See LeveledCompactionStrategy.getScanners.
   */
  public interface ISSTableScanner extends UnfilteredPartitionIterator
  {
      public long getLengthInBytes();
      public long getCompressedLengthInBytes();
      public long getCurrentPosition();
      public long getBytesScanned();
      public Set<SSTableReader> getBackingSSTables();
  
      public static void closeAllAndPropagate(Collection<ISSTableScanner> scanners, Throwable throwable)
      {
          for (ISSTableScanner scanner: scanners)
          {
              try
              {
                  scanner.close();
              }
              catch (Throwable t2)
              {
                  JVMStabilityInspector.inspectThrowable(t2);
                  if (throwable == null)
                  {
                      throwable = t2;
                  }
                  else
                  {
                      throwable.addSuppressed(t2);
                  }
              }
          }
  
          if (throwable != null)
          {
              Throwables.throwIfUnchecked(throwable);
              throw new RuntimeException(throwable);
          }
  
      }
  }
  