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   * "License"); you may not use this file except in compliance
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  package org.apache.cassandra.distributed.test;
  
  import java.io.IOException;
  import java.util.Set;
  import java.util.concurrent.ExecutionException;
  import java.util.stream.Collectors;
  
  import org.junit.Test;
  
  import org.apache.cassandra.cql3.QueryHandler;
  import org.apache.cassandra.cql3.QueryProcessor;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.SystemKeyspace;
  import org.apache.cassandra.distributed.Cluster;
  import org.apache.cassandra.distributed.api.IInvokableInstance;
  import org.apache.cassandra.schema.Schema;
  import org.apache.cassandra.schema.SchemaConstants;
  import org.apache.cassandra.schema.TableMetadata;
  
  import static com.datastax.driver.core.ParseUtils.doubleQuote;
  import static org.assertj.core.api.Assertions.assertThat;
  
  public class SystemKeyspacesDataLocationTest extends TestBaseImpl
  {
      @Test
      public void preparedStatementsShouldNotBeMovedOnStartupTest() throws IOException, ExecutionException, InterruptedException
      {
          try (Cluster cluster = Cluster.build(1).withDataDirCount(3).start())
          {
              // to test the behaviour we need have sstables of prepared statements in more than one data directory
              cluster.get(1).runOnInstance(() -> {
                  ColumnFamilyStore preparedStatementsCFS = ColumnFamilyStore.getIfExists(SchemaConstants.SYSTEM_KEYSPACE_NAME, SystemKeyspace.PREPARED_STATEMENTS);
                  preparedStatementsCFS.disableAutoCompaction();
                  createSSTablesForPreparedStatementsTable(preparedStatementsCFS);
              });
  
              Set<String> preparedStatementsDataLocationsBefore = getPreparedStatementsDataLocations(cluster.get(1));
              assertThat(preparedStatementsDataLocationsBefore).hasSizeGreaterThan(1);
              cluster.get(1).shutdown().get();
  
              // we expect that for prepared statements, sstables will not be moved to the first data directory on startup
              cluster.get(1).startup();
              Set<String> preparedStatementsDataLocationsAfter = getPreparedStatementsDataLocations(cluster.get(1));
              assertThat(preparedStatementsDataLocationsAfter).isEqualTo(preparedStatementsDataLocationsBefore);
          }
      }
  
      private static Set<String> getPreparedStatementsDataLocations(IInvokableInstance i)
      {
          return i.callOnInstance(() -> ColumnFamilyStore.getIfExists(SchemaConstants.SYSTEM_KEYSPACE_NAME, SystemKeyspace.PREPARED_STATEMENTS)
                                                         .getLiveSSTables().stream()
                                                         // sstables are located at <data-location>/<keyspace-name>/<table-name-with-id> so we need to go up two directories to get the data location
                                                         .map(sstr -> sstr.descriptor.directory.parent().parent().toString())
                                                         .collect(Collectors.toSet()));
      }
  
      private static void createSSTablesForPreparedStatementsTable(ColumnFamilyStore preparedStatementsCFS)
      {
          for (String keyspaceName : SchemaConstants.LOCAL_SYSTEM_KEYSPACE_NAMES)
          {
              for (TableMetadata tableMetadata : Schema.instance.getKeyspaceMetadata(keyspaceName).tables)
              {
                  String query = String.format("select * from %s.%s", keyspaceName, doubleQuote(tableMetadata.name));
                  QueryHandler.Prepared prepared = QueryProcessor.prepareInternal(query);
                  QueryProcessor.storePreparedStatement(query, keyspaceName, prepared);
                  preparedStatementsCFS.forceBlockingFlush(ColumnFamilyStore.FlushReason.UNIT_TESTS);
              }
          }
      }
  }
  