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   * Licensed to the Apache Software Foundation (ASF) under one
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   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     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
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  package com.datastax.dse.driver.api.core.graph.reactive;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import com.datastax.dse.driver.api.core.config.DseDriverOption;
  import com.datastax.dse.driver.api.core.graph.ScriptGraphStatement;
  import com.datastax.dse.driver.internal.core.graph.GraphProtocol;
  import com.datastax.oss.driver.api.core.CqlSession;
  import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
  import com.datastax.oss.driver.api.core.cql.ExecutionInfo;
  import com.datastax.oss.driver.api.testinfra.ccm.CustomCcmRule;
  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.tngtech.java.junit.dataprovider.DataProvider;
  import com.tngtech.java.junit.dataprovider.DataProviderRunner;
  import io.reactivex.Flowable;
  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.rules.RuleChain;
  import org.junit.rules.TestRule;
  import org.junit.runner.RunWith;
  
  @BackendRequirement(
      type = BackendType.DSE,
      minInclusive = "6.8.0",
      description = "Graph paging requires DSE 6.8+")
  @RunWith(DataProviderRunner.class)
  public class DefaultReactiveGraphResultSetIT {
  
    private static CustomCcmRule ccmRule = CustomCcmRule.builder().withDseWorkloads("graph").build();
  
    private static SessionRule<CqlSession> sessionRule =
        SessionRule.builder(ccmRule)
            .withCreateGraph()
            .withCoreEngine()
            .withGraphProtocol(GraphProtocol.GRAPH_BINARY_1_0.toInternalCode())
            .build();
  
    @ClassRule public static TestRule chain = RuleChain.outerRule(ccmRule).around(sessionRule);
  
    @BeforeClass
    public static void setupSchema() {
      sessionRule
          .session()
          .execute(
              ScriptGraphStatement.newInstance(
                      "schema.vertexLabel('person')"
                          + ".partitionBy('pk', Int)"
                          + ".clusterBy('cc', Int)"
                          + ".property('name', Text)"
                          + ".create();")
                  .setGraphName(sessionRule.getGraphName()));
      for (int i = 1; i <= 1000; i++) {
        sessionRule
            .session()
            .execute(
                ScriptGraphStatement.newInstance(
                        String.format(
                            "g.addV('person').property('pk',0).property('cc',%d).property('name', '%s');",
                            i, "user" + i))
                    .setGraphName(sessionRule.getGraphName()));
      }
    }
  
    @Test
    @DataProvider(
        value = {"1", "10", "100", "999", "1000", "1001", "2000"},
        format = "%m [page size %p[0]]")
    public void should_retrieve_all_rows(int pageSize) {
      DriverExecutionProfile profile =
          sessionRule
              .session()
              .getContext()
              .getConfig()
              .getDefaultProfile()
              .withInt(DseDriverOption.GRAPH_CONTINUOUS_PAGING_PAGE_SIZE, pageSize);
      ScriptGraphStatement statement =
          ScriptGraphStatement.builder("g.V()").setExecutionProfile(profile).build();
      ReactiveGraphResultSet rs = sessionRule.session().executeReactive(statement);
      List<ReactiveGraphNode> results = Flowable.fromPublisher(rs).toList().blockingGet();
      assertThat(results.size()).isEqualTo(1000);
      Set<ExecutionInfo> expectedExecInfos = new LinkedHashSet<>();
      for (ReactiveGraphNode row : results) {
        assertThat(row.getExecutionInfo()).isNotNull();
        assertThat(row.isVertex()).isTrue();
        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);
    }
  }
  