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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.
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  package org.apache.cassandra.db.compaction;
  
  import java.util.Collections;
  
  import com.google.common.collect.Iterables;
  import org.junit.After;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.junit.Assert;
  import org.apache.cassandra.SchemaLoader;
  import org.apache.cassandra.Util;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.RowUpdateBuilder;
  import org.apache.cassandra.db.lifecycle.ILifecycleTransaction;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.schema.CompactionParams;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.utils.FBUtilities;
  
  public class AbstractCompactionStrategyTest
  {
      private static final String KEYSPACE1 = "Keyspace1";
      private static final String LCS_TABLE = "LCS_TABLE";
      private static final String STCS_TABLE = "STCS_TABLE";
      private static final String TWCS_TABLE = "TWCS_TABLE";
  
      @BeforeClass
      public static void loadData() throws ConfigurationException
      {
          SchemaLoader.prepareServer();
          SchemaLoader.createKeyspace(KEYSPACE1,
                                      KeyspaceParams.simple(1),
                                      SchemaLoader.standardCFMD(KEYSPACE1, LCS_TABLE)
                                                  .compaction(CompactionParams.lcs(Collections.emptyMap())),
                                      SchemaLoader.standardCFMD(KEYSPACE1, STCS_TABLE)
                                                  .compaction(CompactionParams.stcs(Collections.emptyMap())),
                                      SchemaLoader.standardCFMD(KEYSPACE1, TWCS_TABLE)
                                                  .compaction(CompactionParams.create(TimeWindowCompactionStrategy.class, Collections.emptyMap())));
          Keyspace.open(KEYSPACE1).getColumnFamilyStore(LCS_TABLE).disableAutoCompaction();
          Keyspace.open(KEYSPACE1).getColumnFamilyStore(STCS_TABLE).disableAutoCompaction();
          Keyspace.open(KEYSPACE1).getColumnFamilyStore(TWCS_TABLE).disableAutoCompaction();
      }
  
      @After
      public void tearDown()
      {
  
          Keyspace.open(KEYSPACE1).getColumnFamilyStore(LCS_TABLE).truncateBlocking();
          Keyspace.open(KEYSPACE1).getColumnFamilyStore(STCS_TABLE).truncateBlocking();
          Keyspace.open(KEYSPACE1).getColumnFamilyStore(TWCS_TABLE).truncateBlocking();
      }
  
      @Test(timeout=30000)
      public void testGetNextBackgroundTaskDoesNotBlockLCS()
      {
          testGetNextBackgroundTaskDoesNotBlock(LCS_TABLE);
      }
  
      @Test(timeout=30000)
      public void testGetNextBackgroundTaskDoesNotBlockSTCS()
      {
          testGetNextBackgroundTaskDoesNotBlock(STCS_TABLE);
      }
  
      @Test(timeout=30000)
      public void testGetNextBackgroundTaskDoesNotBlockTWCS()
      {
          testGetNextBackgroundTaskDoesNotBlock(TWCS_TABLE);
      }
  
      public void testGetNextBackgroundTaskDoesNotBlock(String table)
      {
          ColumnFamilyStore cfs = Keyspace.open(KEYSPACE1).getColumnFamilyStore(table);
          AbstractCompactionStrategy strategy = cfs.getCompactionStrategyManager().getStrategies().get(1).get(0);
  
          // Add 4 sstables
          for (int i = 1; i <= 4; i++)
          {
              insertKeyAndFlush(table, i);
          }
  
          // Check they are returned on the next background task
          long gcBefore1 = FBUtilities.nowInSeconds();
          try (ILifecycleTransaction txn = Iterables.getOnlyElement(strategy.getNextBackgroundTasks(gcBefore1), null).transaction)
          {
              Assert.assertEquals(cfs.getLiveSSTables(), txn.originals());
          }
  
          // now remove sstables on the tracker, to simulate a concurrent transaction
          cfs.getTracker().removeUnsafe(cfs.getLiveSSTables());
  
          // verify the compaction strategy will return null
          long gcBefore = FBUtilities.nowInSeconds();
          Assert.assertNull(Iterables.<AbstractCompactionTask>getOnlyElement(strategy.getNextBackgroundTasks(gcBefore), null));
      }
  
  
      private static void insertKeyAndFlush(String table, int key)
      {
          long timestamp = System.currentTimeMillis();
          DecoratedKey dk = Util.dk(String.format("%03d", key));
          ColumnFamilyStore cfs = Keyspace.open(KEYSPACE1).getColumnFamilyStore(table);
          new RowUpdateBuilder(cfs.metadata(), timestamp, dk.getKey())
          .clustering(String.valueOf(key))
          .add("val", "val")
          .build()
          .applyUnsafe();
          Util.flush(cfs);
      }
  }
  