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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
   * limitations under the License.
   */
  
  package org.apache.cassandra.distributed.test;
  
  import java.io.IOException;
  import java.nio.file.FileStore;
  import java.util.Map;
  
  import org.junit.Test;
  
  import net.bytebuddy.ByteBuddy;
  import net.bytebuddy.dynamic.loading.ClassLoadingStrategy;
  import net.bytebuddy.implementation.MethodDelegation;
  import org.apache.cassandra.db.Directories;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.ConsistencyLevel;
  
  import static net.bytebuddy.matcher.ElementMatchers.named;
  import static net.bytebuddy.matcher.ElementMatchers.takesArguments;
  import static org.junit.Assert.fail;
  
  public class LeveledCompactionTaskTest extends TestBaseImpl
  {
      @Test
      public void testBuildCompactionCandidatesForAvailableDiskSpace() throws IOException
      {
          try (Cluster cluster = init(builder().withNodes(1)
                                               .withConfig(config -> config.set("autocompaction_on_startup_enabled", false))
                                               .withInstanceInitializer(BB::install).start()))
          {
              cluster.schemaChange(withKeyspace("CREATE TABLE %s.tbl (id int primary key) WITH compaction = {'class':'LeveledCompactionStrategy', 'enabled':'false'}"));
              for (int i = 0; i < 100; i++)
              {
                  cluster.coordinator(1).execute(withKeyspace("INSERT INTO %s.tbl (id) VALUES (?)"), ConsistencyLevel.ALL, i);
                  if (i % 10 == 0)
                      cluster.get(1).flush(KEYSPACE);
              }
              cluster.get(1).flush(KEYSPACE);
              cluster.setUncaughtExceptionsFilter((exception) -> exception.getMessage() != null && exception.getMessage().contains("Not enough space for compaction"));
  
              cluster.get(1).runOnInstance(() -> {
                  BB.hasDiskSpaceResult = false;
                  try
                  {
                      Keyspace.open(KEYSPACE).getColumnFamilyStore("tbl").enableAutoCompaction(true);
                      fail("This should fail, but only due to having no disk space");
                  }
                  catch (Exception e)
                  {
                      if (!(e.getMessage() != null && e.getMessage().contains("Not enough space for compaction")))
                          throw e;
                  }
              });
          }
      }
  
      public static class BB
      {
          static volatile boolean hasDiskSpaceResult = true;
  
          @SuppressWarnings("resource")
          public static void install(ClassLoader cl, int id)
          {
              new ByteBuddy().rebase(Directories.class)
                             .method(named("hasDiskSpaceForCompactionsAndStreams").and(takesArguments(2)))
                             .intercept(MethodDelegation.to(BB.class))
                             .make()
                             .load(cl, ClassLoadingStrategy.Default.INJECTION);
          }
  
          @SuppressWarnings("unused")
          public static boolean hasDiskSpaceForCompactionsAndStreams(Map<FileStore, Long> totalToWrite)
          {
              return hasDiskSpaceResult;
          }
      }
  }
  