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.index.sai.disk.io;
  
  import java.io.IOException;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  
  import com.google.common.base.Throwables;
  
  import org.apache.cassandra.io.util.FileHandle;
  import org.apache.cassandra.io.util.SequentialWriterOption;
  import org.apache.lucene.store.IndexInput;
  
  import static org.junit.Assert.assertNotNull;
  
  public class TrackingIndexFileUtils extends IndexFileUtils
  {
      private final Map<TrackedForwardingIndexInput, String> openInputs = Collections.synchronizedMap(new HashMap<>());
  
      public TrackingIndexFileUtils(SequentialWriterOption writerOption)
      {
          super(writerOption);
      }
  
      @Override
      public IndexInput openInput(FileHandle handle)
      {
          TrackedForwardingIndexInput input = new TrackedForwardingIndexInput(super.openInput(handle));
          openInputs.put(input, Throwables.getStackTraceAsString(new RuntimeException("Input created")));
          return input;
      }
  
      public Map<IndexInput, String> getOpenInputs()
      {
          return new HashMap<>(openInputs);
      }
  
      public class TrackedForwardingIndexInput extends IndexInput
      {
          private final IndexInput delegate;
  
          protected TrackedForwardingIndexInput(IndexInput delegate)
          {
              super(delegate.toString());
              this.delegate = delegate;
          }
  
          @Override
          public void close() throws IOException
          {
              delegate.close();
              final String creationStackTrace = openInputs.remove(this);
              assertNotNull("Closed unregistered input: " + this, creationStackTrace);
          }
  
          @Override
          public long getFilePointer()
          {
              return delegate.getFilePointer();
          }
  
          @Override
          public void seek(long pos) throws IOException
          {
              delegate.seek(pos);
          }
  
          @Override
          public long length()
          {
              return delegate.length();
          }
  
          @Override
          public IndexInput slice(String sliceDescription, long offset, long length) throws IOException
          {
              return delegate.slice(sliceDescription, offset, length);
          }
  
          @Override
          public byte readByte() throws IOException
          {
              return delegate.readByte();
          }
  
          @Override
          public void readBytes(byte[] b, int offset, int len) throws IOException
          {
              delegate.readBytes(b, offset, len);
          }
  
          @Override
          public String toString()
          {
              return delegate.toString();
          }
      }
  }
  