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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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   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
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  package org.apache.cassandra.metrics;
  
  import java.io.IOException;
  import java.util.function.Supplier;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import org.junit.AfterClass;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import com.codahale.metrics.Metric;
  import com.datastax.driver.core.Cluster;
  import com.datastax.driver.core.ResultSet;
  import com.datastax.driver.core.Row;
  import com.datastax.driver.core.Session;
  import org.apache.cassandra.ServerTestUtils;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.exceptions.ConfigurationException;
  import org.apache.cassandra.service.EmbeddedCassandraService;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  public class KeyspaceMetricsTest
  {
      private static Session session;
      private static Cluster cluster;
      private static EmbeddedCassandraService cassandra;
  
      @BeforeClass
      public static void setup() throws ConfigurationException, IOException
      {
          cassandra = ServerTestUtils.startEmbeddedCassandraService();
  
          cluster = Cluster.builder().addContactPoint("127.0.0.1").withPort(DatabaseDescriptor.getNativeTransportPort()).build();
          session = cluster.connect();
      }
  
      @Test
      public void testMetricsCleanupOnDrop()
      {
          String keyspace = "keyspacemetricstest_metrics_cleanup";
          CassandraMetricsRegistry registry = CassandraMetricsRegistry.Metrics;
          Supplier<Stream<String>> metrics = () -> registry.getNames().stream().filter(m -> m.contains(keyspace));
  
          // no metrics before creating
          assertEquals(0, metrics.get().count());
  
          session.execute(String.format("CREATE KEYSPACE %s WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };", keyspace));
          // some metrics
          assertTrue(metrics.get().count() > 0);
  
          session.execute(String.format("DROP KEYSPACE %s;", keyspace));
          // no metrics after drop
          assertEquals(metrics.get().collect(Collectors.joining(",")), 0, metrics.get().count());
      }
  
      @Test
      public void testKeyspaceVirtualTable()
      {
          String keyspace = "uniquemetricskeyspace1";
          session.execute(String.format(
              "CREATE KEYSPACE %s WITH replication = { 'class' : 'SimpleStrategy', 'replication_factor' : 1 };",
              keyspace));
  
          assertTrue(CassandraMetricsRegistry.Metrics.getNames().stream().anyMatch(m -> m.endsWith(keyspace)));
          ResultSet resultSet = session.execute(
              "SELECT * FROM system_metrics.keyspace_group WHERE scope = '" + keyspace + "';");
  
          int count = 0;
          for (Row row : resultSet)
          {
              String metricName = row.getString("name");
              if (!metricName.endsWith(keyspace))
                  continue;
  
              Metric metric = CassandraMetricsRegistry.Metrics.getMetrics().get(metricName);
              assertEquals(CassandraMetricsRegistry.getValueAsString(metric), row.getString("value"));
              count++;
          }
  
          assertTrue("Keyspace " + keyspace + " metrics was not found", count > 0);
  
          session.execute(String.format("DROP KEYSPACE %s;", keyspace));
          assertFalse(CassandraMetricsRegistry.Metrics.getNames().stream().anyMatch(m -> m.endsWith(keyspace)));
      }
  
      @AfterClass
      public static void tearDown()
      {
          if (cluster != null)
              cluster.close();
          if (cassandra != null)
              cassandra.stop();
      }
  }
  