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   * Licensed to the Apache Software Foundation (ASF) under one
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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
   *
   * 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.virtual;
  
  import java.util.concurrent.atomic.AtomicInteger;
  
  import com.google.common.collect.ImmutableList;
  
  import com.datastax.driver.core.PreparedStatement;
  import com.datastax.driver.core.ResultSet;
  import com.datastax.driver.core.Session;
  
  import static org.junit.Assert.assertEquals;
  
  import org.junit.Test;
  
  import org.apache.cassandra.cql3.CQLTester;
  import org.apache.cassandra.cql3.QueryProcessor;
  import org.apache.cassandra.metrics.CQLMetrics;
  
  public class CQLMetricsTableTest extends CQLTester
  {
      private static final String KS_NAME = "vts";
  
      private void queryAndValidateMetrics(CQLMetrics expectedMetrics) throws Throwable
      {
          String getMetricsQuery = "SELECT * FROM " + KS_NAME + "." + CQLMetricsTable.TABLE_NAME;
          ResultSet vtsRows = executeNet(getMetricsQuery);
  
          assertEquals(2, vtsRows.getColumnDefinitions().size());
  
          AtomicInteger rowCount = new AtomicInteger(0);
          vtsRows.forEach(r -> {
              final double metricValue = r.getDouble(CQLMetricsTable.VALUE_COL);
              switch (r.getString(CQLMetricsTable.NAME_COL))
              {
                  case CQLMetricsTable.PREPARED_STATEMENTS_COUNT:
                      assertEquals(expectedMetrics.preparedStatementsCount.getValue(), metricValue, 0);
                      break;
                  case CQLMetricsTable.PREPARED_STATEMENTS_EVICTED:
                      assertEquals(expectedMetrics.preparedStatementsEvicted.getCount(), metricValue, 0);
                      break;
                  case CQLMetricsTable.PREPARED_STATEMENTS_EXECUTED:
                      assertEquals(expectedMetrics.preparedStatementsExecuted.getCount(), metricValue, 0);
                      break;
                  case CQLMetricsTable.PREPARED_STATEMENTS_RATIO:
                      assertEquals(expectedMetrics.preparedStatementsRatio.getValue(), metricValue, 0.01);
                      break;
                  case CQLMetricsTable.REGULAR_STATEMENTS_EXECUTED:
                      assertEquals(expectedMetrics.regularStatementsExecuted.getCount(), metricValue, 0);
                      break;
              }
              rowCount.getAndIncrement();
          });
  
          assertEquals(5, rowCount.get());
      }
  
      @Test
      public void testUsingPrepareStmts() throws Throwable
      {
          CQLMetricsTable table = new CQLMetricsTable(KS_NAME);
          VirtualKeyspaceRegistry.instance.register(new VirtualKeyspace(KS_NAME, ImmutableList.of(table)));
  
          String ks = createKeyspace("CREATE KEYSPACE %s WITH replication={ 'class' : 'SimpleStrategy', 'replication_factor' : 1 }");
          String tbl = createTable(ks, "CREATE TABLE %s (id int PRIMARY KEY, cid int, val text)");
          Session session = sessionNet();
  
          String insertCQL = "INSERT INTO " + ks + "." + tbl + " (id, cid, val) VALUES (?, ?, ?)";
          PreparedStatement preparedInsert = session.prepare(insertCQL);
  
          String selectCQL = "Select * from " + ks + "." + tbl + " where id = ?";
          PreparedStatement preparedSelect = session.prepare(selectCQL);
  
          for (int i = 0; i < 10; i++)
          {
              session.execute(preparedInsert.bind(i, i, "value" + i));
              session.execute(preparedSelect.bind(i));
          }
  
          queryAndValidateMetrics(QueryProcessor.metrics);
      }
  
      @Test
      public void testUsingInjectedValues() throws Throwable
      {
          CQLMetrics cqlMetrics = new CQLMetrics();
          CQLMetricsTable table = new CQLMetricsTable(KS_NAME, cqlMetrics);
          VirtualKeyspaceRegistry.instance.register(new VirtualKeyspace(KS_NAME, ImmutableList.of(table)));
  
          // With initial injected values
          cqlMetrics.preparedStatementsExecuted.inc(50);
          cqlMetrics.regularStatementsExecuted.inc(100);
          cqlMetrics.preparedStatementsEvicted.inc(25);
          queryAndValidateMetrics(cqlMetrics);
  
          // Test again with updated values
          cqlMetrics.preparedStatementsExecuted.inc(150);
          cqlMetrics.regularStatementsExecuted.inc(200);
          cqlMetrics.preparedStatementsEvicted.inc(50);
          queryAndValidateMetrics(cqlMetrics);
      }
  }
  