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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.db;
  
  import java.io.IOException;
  import java.net.UnknownHostException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.stream.Collectors;
  
  import com.google.common.collect.ImmutableSet;
  import com.google.common.collect.Lists;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import org.apache.cassandra.ServerTestUtils;
  import org.apache.cassandra.Util;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.dht.BootStrapper;
  import org.apache.cassandra.dht.IPartitioner;
  import org.apache.cassandra.dht.Murmur3Partitioner;
  import org.apache.cassandra.dht.Token;
  import org.apache.cassandra.distributed.test.log.ClusterMetadataTestHelper;
  import org.apache.cassandra.io.sstable.format.SSTableReader;
  import org.apache.cassandra.io.util.File;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.schema.MockSchema;
  import org.apache.cassandra.service.StorageService;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.tcm.Epoch;
  import org.apache.cassandra.tcm.membership.NodeAddresses;
  import org.apache.cassandra.tcm.transformations.Register;
  import org.apache.cassandra.tcm.transformations.UnsafeJoin;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.apache.cassandra.utils.FBUtilities;
  
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotSame;
  import static org.junit.Assert.assertSame;
  import static org.junit.Assert.fail;
  
  public class DiskBoundaryManagerTest extends CQLTester
  {
      private DiskBoundaryManager dbm;
      private MockCFS mock;
      private Directories dirs;
      private List<Directories.DataDirectory> datadirs;
      private List<File> tableDirs;
      private Path tmpDir;
  
      @BeforeClass
      public static void setUpClass()
      {
          ServerTestUtils.daemonInitialization();
          StorageService.instance.setPartitionerUnsafe(Murmur3Partitioner.instance);
          ServerTestUtils.prepareServerNoRegister();
          ClusterMetadataTestHelper.register(FBUtilities.getBroadcastAddressAndPort());
          ClusterMetadataTestHelper.join(FBUtilities.getBroadcastAddressAndPort(),
                                         BootStrapper.getRandomTokens(ClusterMetadata.current(), 10));
          ServerTestUtils.markCMS();
      }
  
      @Before
      public void setup() throws IOException
      {
          DisallowedDirectories.clearUnwritableUnsafe();
          createTable("create table %s (id int primary key, x text)");
          tmpDir = Files.createTempDirectory("DiskBoundaryManagerTest");
          datadirs = Lists.newArrayList(new Directories.DataDirectory(new File(tmpDir, "1")),
                                        new Directories.DataDirectory(new File(tmpDir, "2")),
                                        new Directories.DataDirectory(new File(tmpDir, "3")));
          dirs = new Directories(getCurrentColumnFamilyStore().metadata(), datadirs);
          mock = new MockCFS(getCurrentColumnFamilyStore(), dirs);
          dbm = mock.diskBoundaryManager;
          tableDirs = datadirs.stream().map(ddir -> mock.getDirectories().getLocationForDisk(ddir)).collect(Collectors.toList());
      }
  
      @Test
      public void getBoundariesTest()
      {
          DiskBoundaries dbv = dbm.getDiskBoundaries(mock);
          Assert.assertEquals(3, dbv.positions.size());
          assertEquals(dbv.directories, dirs.getWriteableLocations());
      }
  
      @Test
      public void disallowedDirectoriesTest()
      {
          DiskBoundaries dbv = dbm.getDiskBoundaries(mock);
          Assert.assertEquals(3, dbv.positions.size());
          assertEquals(dbv.directories, dirs.getWriteableLocations());
          DisallowedDirectories.maybeMarkUnwritable(new File(tmpDir, "3"));
          dbv = dbm.getDiskBoundaries(mock);
          Assert.assertEquals(2, dbv.positions.size());
          Assert.assertEquals(Lists.newArrayList(new Directories.DataDirectory(new File(tmpDir, "1")),
                                                 new Directories.DataDirectory(new File(tmpDir, "2"))),
                                   dbv.directories);
      }
  
      @Test
      public void updateTokensTest() throws UnknownHostException
      {
          //do not use mock to since it will not be invalidated after alter keyspace
          DiskBoundaryManager dbm = getCurrentColumnFamilyStore().diskBoundaryManager;
          DiskBoundaries dbv1 = dbm.getDiskBoundaries(mock);
          InetAddressAndPort ep = InetAddressAndPort.getByName("127.0.0.10");
          UnsafeJoin.unsafeJoin(Register.register(new NodeAddresses(ep)), BootStrapper.getRandomTokens(ClusterMetadata.current(), 10));
          DiskBoundaries dbv2 = dbm.getDiskBoundaries(mock);
          assertFalse(dbv1.equals(dbv2));
      }
  
      @Test
      public void alterKeyspaceTest() throws Throwable
      {
          //do not use mock to since it will not be invalidated after alter keyspace
          DiskBoundaryManager dbm = getCurrentColumnFamilyStore().diskBoundaryManager;
          DiskBoundaries dbv1 = dbm.getDiskBoundaries(mock);
          execute("alter keyspace "+keyspace()+" with replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 3 }");
          DiskBoundaries dbv2 = dbm.getDiskBoundaries(mock);
          assertNotSame(dbv1, dbv2);
          DiskBoundaries dbv3 = dbm.getDiskBoundaries(mock);
          assertSame(dbv2, dbv3);
  
      }
  
      @Test
      public void testGetDisksInBounds()
      {
          List<PartitionPosition> pps = new ArrayList<>();
  
          pps.add(pp(100));
          pps.add(pp(200));
          pps.add(pp(Long.MAX_VALUE)); // last position is always the max token
  
          DiskBoundaries diskBoundaries = new DiskBoundaries(mock, dirs.getWriteableLocations(), pps, Epoch.EMPTY, 0);
  
          Assert.assertEquals(Lists.newArrayList(datadirs.get(0)),                  diskBoundaries.getDisksInBounds(dk(10),  dk(50)));
          Assert.assertEquals(Lists.newArrayList(datadirs.get(2)),                  diskBoundaries.getDisksInBounds(dk(250), dk(500)));
          Assert.assertEquals(Lists.newArrayList(datadirs),                         diskBoundaries.getDisksInBounds(dk(0),   dk(250)));
          Assert.assertEquals(Lists.newArrayList(datadirs),                         diskBoundaries.getDisksInBounds(dk(0),   dk(250)));
          Assert.assertEquals(Lists.newArrayList(datadirs.get(1), datadirs.get(2)), diskBoundaries.getDisksInBounds(dk(150), dk(250)));
          Assert.assertEquals(Lists.newArrayList(datadirs),                         diskBoundaries.getDisksInBounds(null,       dk(250)));
  
          Assert.assertEquals(Lists.newArrayList(datadirs.get(0)),                  diskBoundaries.getDisksInBounds(dk(0),   dk(99)));
          Assert.assertEquals(Lists.newArrayList(datadirs.get(0)),                  diskBoundaries.getDisksInBounds(dk(0),   dk(100))); // pp(100) is maxKeyBound, so dk(100) < pp(100)
          Assert.assertEquals(Lists.newArrayList(datadirs.get(0), datadirs.get(1)), diskBoundaries.getDisksInBounds(dk(100), dk(200)));
          Assert.assertEquals(Lists.newArrayList(datadirs.get(1)),                  diskBoundaries.getDisksInBounds(dk(101), dk(101)));
  
      }
  
      @Test
      public void testGetDataDirectoriesForFiles()
      {
          int gen = 1;
          List<Murmur3Partitioner.LongToken> tokens = mock.getDiskBoundaries().positions.stream().map(t -> (Murmur3Partitioner.LongToken)t.getToken()).collect(Collectors.toList());
          IPartitioner partitioner = Murmur3Partitioner.instance;
  
          Murmur3Partitioner.LongToken sstableFirstDisk1 = (Murmur3Partitioner.LongToken) partitioner.midpoint(partitioner.getMinimumToken(), tokens.get(0));
          Murmur3Partitioner.LongToken sstableEndDisk1   = (Murmur3Partitioner.LongToken) partitioner.midpoint(sstableFirstDisk1,             tokens.get(0));
          Murmur3Partitioner.LongToken sstableEndDisk2   = (Murmur3Partitioner.LongToken) partitioner.midpoint(tokens.get(0),                 tokens.get(1));
          Murmur3Partitioner.LongToken sstableFirstDisk2 = (Murmur3Partitioner.LongToken) partitioner.midpoint(tokens.get(0),                 sstableEndDisk2);
  
          SSTableReader containedDisk1 = MockSchema.sstable(gen++, (long)sstableFirstDisk1.getTokenValue(), (long)sstableEndDisk1.getTokenValue(), 0, mock);
          SSTableReader startDisk1EndDisk2 = MockSchema.sstable(gen++, (long)sstableFirstDisk1.getTokenValue(), (long)sstableEndDisk2.getTokenValue(), 0, mock);
          SSTableReader containedDisk2 = MockSchema.sstable(gen++, (long)sstableFirstDisk2.getTokenValue(), (long)sstableEndDisk2.getTokenValue(), 0, mock);
  
          SSTableReader disk1Boundary = MockSchema.sstable(gen++, (long)sstableFirstDisk1.getTokenValue(), (long)tokens.get(0).getTokenValue(), 0, mock);
          SSTableReader disk2Full = MockSchema.sstable(gen++, (long)tokens.get(0).nextValidToken().getTokenValue(), (long)tokens.get(1).getTokenValue(), 0, mock);
          SSTableReader disk3Full = MockSchema.sstable(gen++, (long)tokens.get(1).nextValidToken().getTokenValue(), (long)partitioner.getMaximumTokenForSplitting().getTokenValue(), 0, mock);
  
          Assert.assertEquals(tableDirs, mock.getDirectoriesForFiles(ImmutableSet.of()));
          Assert.assertEquals(Lists.newArrayList(tableDirs.get(0)), mock.getDirectoriesForFiles(ImmutableSet.of(containedDisk1)));
          Assert.assertEquals(Lists.newArrayList(tableDirs.get(0), tableDirs.get(1)), mock.getDirectoriesForFiles(ImmutableSet.of(containedDisk1, startDisk1EndDisk2)));
          Assert.assertEquals(Lists.newArrayList(tableDirs.get(1)), mock.getDirectoriesForFiles(ImmutableSet.of(containedDisk2)));
          Assert.assertEquals(Lists.newArrayList(tableDirs.get(0), tableDirs.get(1)), mock.getDirectoriesForFiles(ImmutableSet.of(containedDisk1, containedDisk2)));
  
          Assert.assertEquals(Lists.newArrayList(tableDirs.get(0)), mock.getDirectoriesForFiles(ImmutableSet.of(disk1Boundary)));
          Assert.assertEquals(Lists.newArrayList(tableDirs.get(1)), mock.getDirectoriesForFiles(ImmutableSet.of(disk2Full)));
  
          Assert.assertEquals(tableDirs, mock.getDirectoriesForFiles(ImmutableSet.of(containedDisk1, disk3Full)));
      }
  
      private PartitionPosition pp(long t)
      {
          return t(t).maxKeyBound();
      }
      private Token t(long t)
      {
          return new Murmur3Partitioner.LongToken(t);
      }
      private DecoratedKey dk(long t)
      {
          return new BufferDecoratedKey(t(t), ByteBufferUtil.EMPTY_BYTE_BUFFER);
      }
  
      private static void assertEquals(List<Directories.DataDirectory> dir1, Directories.DataDirectory[] dir2)
      {
          if (dir1.size() != dir2.length)
              fail();
          for (int i = 0; i < dir2.length; i++)
          {
              if (!dir1.get(i).equals(dir2[i]))
                  fail();
          }
      }
  
      // just to be able to override the data directories
      private static class MockCFS extends ColumnFamilyStore
      {
          MockCFS(ColumnFamilyStore cfs, Directories dirs)
          {
              super(cfs.keyspace, cfs.getTableName(), Util.newSeqGen(), cfs.metadata.get(), dirs, false, false);
          }
      }
  }
  