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   * 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
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   */
  
  package org.apache.cassandra.utils.binlog;
  
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Random;
  
  import org.apache.cassandra.io.util.File;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  public class DeletingArchiverTest
  {
      @Test
      public void testDelete() throws IOException
      {
          DeletingArchiver da = new DeletingArchiver(45);
          List<File> files = generateFiles(10, 5);
          for (File f : files)
              da.onReleased(1, f.toJavaIOFile());
          // adding 5 files, each with size 10, this means the first one should have been deleted:
          assertFalse(files.get(0).exists());
          for (int i = 1; i < files.size(); i++)
              assertTrue(files.get(i).exists());
          assertEquals(40, da.getBytesInStoreFiles());
      }
  
      @Test
      public void testArchiverBigFile() throws IOException
      {
          DeletingArchiver da = new DeletingArchiver(45);
          List<File> largeFiles = generateFiles(50, 1);
          da.onReleased(1, largeFiles.get(0).toJavaIOFile());
          assertFalse(largeFiles.get(0).exists());
          assertEquals(0, da.getBytesInStoreFiles());
      }
  
      @Test
      public void testArchiverSizeTracking() throws IOException
      {
          DeletingArchiver da = new DeletingArchiver(45);
          List<File> smallFiles = generateFiles(10, 4);
          List<File> largeFiles = generateFiles(40, 1);
  
          for (File f : smallFiles)
          {
              da.onReleased(1, f.toJavaIOFile());
          }
          assertEquals(40, da.getBytesInStoreFiles());
          // we now have 40 bytes in deleting archiver, adding the large 40 byte file should delete all the small ones
          da.onReleased(1, largeFiles.get(0).toJavaIOFile());
          for (File f : smallFiles)
              assertFalse(f.exists());
  
          smallFiles = generateFiles(10, 4);
  
          // make sure that size tracking is ok - all 4 new small files should still be there and the large one should be gone
          for (File f : smallFiles)
              da.onReleased(1, f.toJavaIOFile());
  
          assertFalse(largeFiles.get(0).exists());
          for (File f : smallFiles)
              assertTrue(f.exists());
          assertEquals(40, da.getBytesInStoreFiles());
      }
  
  
      private List<File> generateFiles(int size, int count) throws IOException
      {
          Random r = new Random();
          List<File> files = new ArrayList<>(count);
          byte [] content = new byte[size];
          r.nextBytes(content);
  
          for (int i = 0; i < count; i++)
          {
              Path p = Files.createTempFile("logfile", ".cq4");
              Files.write(p, content);
              files.add(new File(p));
          }
          files.forEach(File::deleteOnExit);
          return files;
      }
  }
  