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   * "License"); you may not use this file except in compliance
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  package com.datastax.dse.driver.api.core.cql.continuous.reactive;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingITBase;
  import com.datastax.dse.driver.api.core.cql.reactive.ReactiveRow;
  import com.datastax.dse.driver.api.core.metrics.DseSessionMetric;
  import com.datastax.oss.driver.api.core.CqlSession;
  import com.datastax.oss.driver.api.core.config.DefaultDriverOption;
  import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
  import com.datastax.oss.driver.api.core.cql.ColumnDefinitions;
  import com.datastax.oss.driver.api.core.cql.ExecutionInfo;
  import com.datastax.oss.driver.api.core.cql.SimpleStatement;
  import com.datastax.oss.driver.api.core.metrics.DefaultNodeMetric;
  import com.datastax.oss.driver.api.testinfra.ccm.CcmRule;
  import com.datastax.oss.driver.api.testinfra.requirement.BackendRequirement;
  import com.datastax.oss.driver.api.testinfra.requirement.BackendType;
  import com.datastax.oss.driver.api.testinfra.session.SessionRule;
  import com.datastax.oss.driver.api.testinfra.session.SessionUtils;
  import com.datastax.oss.driver.categories.ParallelizableTests;
  import com.tngtech.java.junit.dataprovider.DataProviderRunner;
  import com.tngtech.java.junit.dataprovider.UseDataProvider;
  import io.reactivex.Flowable;
  import java.util.Collections;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Set;
  import org.junit.BeforeClass;
  import org.junit.ClassRule;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.rules.RuleChain;
  import org.junit.rules.TestRule;
  import org.junit.runner.RunWith;
  
  @BackendRequirement(
      type = BackendType.DSE,
      minInclusive = "5.1.0",
      description = "Continuous paging is only available from 5.1.0 onwards")
  @Category(ParallelizableTests.class)
  @RunWith(DataProviderRunner.class)
  public class ContinuousPagingReactiveIT extends ContinuousPagingITBase {
  
    private static CcmRule ccmRule = CcmRule.getInstance();
  
    private static SessionRule<CqlSession> sessionRule =
        SessionRule.builder(ccmRule)
            .withConfigLoader(
                SessionUtils.configLoaderBuilder()
                    .withStringList(
                        DefaultDriverOption.METRICS_SESSION_ENABLED,
                        Collections.singletonList(DseSessionMetric.CONTINUOUS_CQL_REQUESTS.getPath()))
                    .withStringList(
                        DefaultDriverOption.METRICS_NODE_ENABLED,
                        Collections.singletonList(DefaultNodeMetric.CQL_MESSAGES.getPath()))
                    .build())
            .build();
  
    @ClassRule public static TestRule chain = RuleChain.outerRule(ccmRule).around(sessionRule);
  
    @BeforeClass
    public static void setUp() {
      initialize(sessionRule.session(), sessionRule.slowProfile());
    }
  
    @Test
    @UseDataProvider("pagingOptions")
    public void should_execute_reactively(Options options) {
      CqlSession session = sessionRule.session();
      SimpleStatement statement = SimpleStatement.newInstance("SELECT v from test where k=?", KEY);
      DriverExecutionProfile profile = options.asProfile(session);
      ContinuousReactiveResultSet rs =
          session.executeContinuouslyReactive(statement.setExecutionProfile(profile));
      List<ReactiveRow> results = Flowable.fromPublisher(rs).toList().blockingGet();
      assertThat(results).hasSize(options.expectedRows);
      Set<ExecutionInfo> expectedExecInfos = new LinkedHashSet<>();
      for (int i = 0; i < results.size(); i++) {
        ReactiveRow row = results.get(i);
        assertThat(row.getInt("v")).isEqualTo(i);
        expectedExecInfos.add(row.getExecutionInfo());
      }
  
      List<ExecutionInfo> execInfos =
          Flowable.<ExecutionInfo>fromPublisher(rs.getExecutionInfos()).toList().blockingGet();
      // DSE may send an empty page as it can't always know if it's done paging or not yet.
      // See: CASSANDRA-8871. In this case, this page's execution info appears in
      // rs.getExecutionInfos(), but is not present in expectedExecInfos since the page did not
      // contain any rows.
      assertThat(execInfos).containsAll(expectedExecInfos);
  
      List<ColumnDefinitions> colDefs =
          Flowable.<ColumnDefinitions>fromPublisher(rs.getColumnDefinitions()).toList().blockingGet();
      ReactiveRow first = results.get(0);
      assertThat(colDefs).hasSize(1).containsExactly(first.getColumnDefinitions());
  
      List<Boolean> wasApplied = Flowable.fromPublisher(rs.wasApplied()).toList().blockingGet();
      assertThat(wasApplied).hasSize(1).containsExactly(first.wasApplied());
  
      validateMetrics(session);
    }
  }
  