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   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
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   *
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  package org.apache.cassandra.test.microbench;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Random;
  import java.util.UUID;
  
  import org.apache.commons.lang3.tuple.Pair;
  
  import org.apache.cassandra.SchemaLoader;
  import org.apache.cassandra.Util;
  import org.apache.cassandra.config.CassandraRelevantProperties;
  import org.apache.cassandra.config.Config;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.RowUpdateBuilder;
  import org.apache.cassandra.db.commitlog.CommitLog;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.schema.TableMetadata;
  import org.apache.cassandra.service.snapshot.SnapshotManager;
  import org.apache.cassandra.service.snapshot.TableSnapshot;
  import org.apache.cassandra.tcm.ClusterMetadataService;
  
  import static org.apache.cassandra.service.snapshot.SnapshotOptions.userSnapshot;
  import static org.junit.Assert.assertEquals;
  
  public abstract class AbstractSnapshotManagerBase
  {
      static final String KEYSPACE = "KEYSPACE";
  
      private final Random random = new Random();
  
      static int NUM_SSTABLES = 10;
      static int NUM_KEYSPACES = 5;
      static int NUM_TABLES_PER_KEYSPACE = 10;
      static int NUM_SNAPSHOTS_PER_TABLE = 10;
  
      public void teardown()
      {
          SnapshotManager.instance.clearAllSnapshots();
          CQLTester.tearDownClass();
          CommitLog.instance.stopUnsafe(true);
          // TODO CASSANDRA-20119
          ClusterMetadataService.instance().log().close();
          CQLTester.cleanup();
      }
  
      public void setup(boolean takeSnapshotAfterTablePopulation)
      {
          CassandraRelevantProperties.SNAPSHOT_CLEANUP_INITIAL_DELAY_SECONDS.getInt(1000);
          CassandraRelevantProperties.SNAPSHOT_CLEANUP_PERIOD_SECONDS.setInt(60);
  
          DatabaseDescriptor.daemonInitialization(() -> {
              Config config = DatabaseDescriptor.loadConfig();
              config.dump_heap_on_uncaught_exception = false;
              return config;
          });
  
          SchemaLoader.prepareServer();
          SnapshotManager.instance.start(true);
  
          populateTables(takeSnapshotAfterTablePopulation);
      }
  
      public void populateTables(boolean takeSnapshotAfterTablePopulation)
      {
          for (int i = 0; i < NUM_KEYSPACES; i++)
          {
              String keyspaceName = KEYSPACE + '_' + i;
  
              // Create Schema
              TableMetadata[] tables = new TableMetadata[NUM_TABLES_PER_KEYSPACE];
              for (int j = 0; j < NUM_TABLES_PER_KEYSPACE; j++)
              {
                  tables[j] = SchemaLoader.standardCFMD(keyspaceName, String.format("table%d", i + '_' + j)).build();
              }
  
              SchemaLoader.createKeyspace(keyspaceName,
                                          KeyspaceParams.simple(1),
                                          tables);
  
              for (int j = 0; j < NUM_TABLES_PER_KEYSPACE; j++)
              {
                  String tableName = String.format("table%d", i + '_' + j);
  
                  ColumnFamilyStore cfs = Keyspace.open(keyspaceName).getColumnFamilyStore(tableName);
                  cfs.disableAutoCompaction();
                  for (int k = 0; k < NUM_SSTABLES; k++)
                  {
                      new RowUpdateBuilder(cfs.metadata(), 0, "key1")
                      .clustering("Column1")
                      .add("val", "asdf")
                      .build()
                      .applyUnsafe();
                      Util.flush(cfs);
                  }
                  if (takeSnapshotAfterTablePopulation)
                  {
                      for (int snapId = 0; snapId < NUM_SNAPSHOTS_PER_TABLE; snapId++)
                          SnapshotManager.instance.takeSnapshot(userSnapshot(String.format("snap_%d_%d_%d", i, j, snapId), cfs.getKeyspaceTableName()));
                  }
              }
          }
  
          if (takeSnapshotAfterTablePopulation)
          {
              List<TableSnapshot> snapshots = SnapshotManager.instance.getSnapshots(t -> true);
              assertEquals(NUM_KEYSPACES * NUM_TABLES_PER_KEYSPACE * NUM_SNAPSHOTS_PER_TABLE, snapshots.size());
          }
      }
  
      public String getRandomKeyspaceTable()
      {
          List<Keyspace> keyspaces = new ArrayList<>();
          Keyspace.nonSystem().forEach(keyspaces::add);
          Keyspace randomKeyspace = keyspaces.get(random.nextInt(keyspaces.size()));
          List<ColumnFamilyStore> cfss = new ArrayList<>(randomKeyspace.getColumnFamilyStores());
          ColumnFamilyStore cfs = cfss.get(random.nextInt(cfss.size()));
  
          return cfs.getKeyspaceTableName();
      }
  
      public String getRandomKeyspace()
      {
          List<Keyspace> keyspaces = new ArrayList<>();
          Keyspace.nonSystem().forEach(keyspaces::add);
          Keyspace randomKeyspace = keyspaces.get(random.nextInt(keyspaces.size()));
          return randomKeyspace.getName();
      }
  
      public Pair<String, String> getRandomKeyspaceTablePair()
      {
          List<Keyspace> keyspaces = new ArrayList<>();
          Keyspace.nonSystem().forEach(keyspaces::add);
          Keyspace randomKeyspace = keyspaces.get(random.nextInt(keyspaces.size()));
          List<ColumnFamilyStore> cfss = new ArrayList<>(randomKeyspace.getColumnFamilyStores());
          ColumnFamilyStore cfs = cfss.get(random.nextInt(cfss.size()));
  
          return Pair.of(cfs.getKeyspaceName(), cfs.getTableName());
      }
  
  
      public void takeSnapshotOnRandomTable()
      {
          SnapshotManager.instance.takeSnapshot(userSnapshot("snap_" + UUID.randomUUID(), getRandomKeyspaceTable()));
      }
  }
  