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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.internal.core.cql.reactive;
  
  import static com.datastax.dse.driver.DseTestFixtures.singleDseRow;
  import static com.datastax.dse.driver.api.core.DseProtocolVersion.DSE_V1;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  import com.datastax.dse.driver.DseTestDataProviders;
  import com.datastax.dse.driver.DseTestFixtures;
  import com.datastax.dse.driver.api.core.cql.reactive.ReactiveResultSet;
  import com.datastax.dse.driver.api.core.cql.reactive.ReactiveRow;
  import com.datastax.oss.driver.api.core.ProtocolVersion;
  import com.datastax.oss.driver.api.core.cql.AsyncResultSet;
  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.Statement;
  import com.datastax.oss.driver.internal.core.context.InternalDriverContext;
  import com.datastax.oss.driver.internal.core.cql.Conversions;
  import com.datastax.oss.driver.internal.core.cql.CqlRequestAsyncProcessor;
  import com.datastax.oss.driver.internal.core.cql.CqlRequestHandlerTestBase;
  import com.datastax.oss.driver.internal.core.cql.PoolBehavior;
  import com.datastax.oss.driver.internal.core.cql.RequestHandlerTestHarness;
  import com.datastax.oss.driver.internal.core.session.DefaultSession;
  import com.tngtech.java.junit.dataprovider.UseDataProvider;
  import io.reactivex.Flowable;
  import java.util.List;
  import java.util.concurrent.CompletableFuture;
  import org.junit.Test;
  
  public class CqlRequestReactiveProcessorTest extends CqlRequestHandlerTestBase {
  
    @Test
    public void should_be_able_to_process_reactive_result_set() {
      CqlRequestReactiveProcessor processor =
          new CqlRequestReactiveProcessor(new CqlRequestAsyncProcessor());
      assertThat(
              processor.canProcess(
                  UNDEFINED_IDEMPOTENCE_STATEMENT, CqlRequestReactiveProcessor.REACTIVE_RESULT_SET))
          .isTrue();
    }
  
    @Test
    public void should_create_request_handler() {
      RequestHandlerTestHarness.Builder builder =
          RequestHandlerTestHarness.builder().withProtocolVersion(DSE_V1);
      try (RequestHandlerTestHarness harness = builder.build()) {
        CqlRequestReactiveProcessor processor =
            new CqlRequestReactiveProcessor(new CqlRequestAsyncProcessor());
        assertThat(
                processor.process(
                    UNDEFINED_IDEMPOTENCE_STATEMENT,
                    harness.getSession(),
                    harness.getContext(),
                    "test"))
            .isInstanceOf(DefaultReactiveResultSet.class);
      }
    }
  
    @Test
    @UseDataProvider(value = "allDseAndOssProtocolVersions", location = DseTestDataProviders.class)
    public void should_complete_single_page_result(ProtocolVersion version) {
      try (RequestHandlerTestHarness harness =
          RequestHandlerTestHarness.builder()
              .withProtocolVersion(version)
              .withResponse(node1, defaultFrameOf(singleDseRow()))
              .build()) {
  
        DefaultSession session = harness.getSession();
        InternalDriverContext context = harness.getContext();
  
        ReactiveResultSet publisher =
            new CqlRequestReactiveProcessor(new CqlRequestAsyncProcessor())
                .process(UNDEFINED_IDEMPOTENCE_STATEMENT, session, context, "test");
  
        List<ReactiveRow> rows = Flowable.fromPublisher(publisher).toList().blockingGet();
  
        assertThat(rows).hasSize(1);
        ReactiveRow row = rows.get(0);
        assertThat(row.getString("message")).isEqualTo("hello, world");
        ExecutionInfo executionInfo = row.getExecutionInfo();
        assertThat(executionInfo.getCoordinator()).isEqualTo(node1);
        assertThat(executionInfo.getErrors()).isEmpty();
        assertThat(executionInfo.getIncomingPayload()).isEmpty();
        assertThat(executionInfo.getPagingState()).isNull();
        assertThat(executionInfo.getSpeculativeExecutionCount()).isEqualTo(0);
        assertThat(executionInfo.getSuccessfulExecutionIndex()).isEqualTo(0);
        assertThat(executionInfo.getWarnings()).isEmpty();
  
        Flowable<ExecutionInfo> execInfosFlowable =
            Flowable.fromPublisher(publisher.getExecutionInfos());
        assertThat(execInfosFlowable.toList().blockingGet()).containsExactly(executionInfo);
  
        Flowable<ColumnDefinitions> colDefsFlowable =
            Flowable.fromPublisher(publisher.getColumnDefinitions());
        assertThat(colDefsFlowable.toList().blockingGet())
            .containsExactly(row.getColumnDefinitions());
  
        Flowable<Boolean> wasAppliedFlowable = Flowable.fromPublisher(publisher.wasApplied());
        assertThat(wasAppliedFlowable.toList().blockingGet()).containsExactly(row.wasApplied());
      }
    }
  
    @Test
    @UseDataProvider(value = "allDseAndOssProtocolVersions", location = DseTestDataProviders.class)
    public void should_complete_multi_page_result(ProtocolVersion version) {
      RequestHandlerTestHarness.Builder builder =
          RequestHandlerTestHarness.builder().withProtocolVersion(version);
      PoolBehavior node1Behavior = builder.customBehavior(node1);
      try (RequestHandlerTestHarness harness = builder.build()) {
  
        DefaultSession session = harness.getSession();
        InternalDriverContext context = harness.getContext();
  
        // The 2nd page is obtained by an "external" call to session.executeAsync(),
        // so we need to mock that.
        CompletableFuture<AsyncResultSet> page2Future = new CompletableFuture<>();
        when(session.executeAsync(any(Statement.class))).thenAnswer(invocation -> page2Future);
        ExecutionInfo mockInfo = mock(ExecutionInfo.class);
  
        ReactiveResultSet publisher =
            new CqlRequestReactiveProcessor(new CqlRequestAsyncProcessor())
                .process(UNDEFINED_IDEMPOTENCE_STATEMENT, session, context, "test");
  
        Flowable<ReactiveRow> rowsPublisher = Flowable.fromPublisher(publisher).cache();
        rowsPublisher.subscribe();
  
        // emulate arrival of page 1
        node1Behavior.setResponseSuccess(defaultFrameOf(DseTestFixtures.tenDseRows(1, false)));
  
        // emulate arrival of page 2 following the call to session.executeAsync()
        page2Future.complete(
            Conversions.toResultSet(
                DseTestFixtures.tenDseRows(2, true),
                mockInfo,
                harness.getSession(),
                harness.getContext()));
  
        List<ReactiveRow> rows = rowsPublisher.toList().blockingGet();
        assertThat(rows).hasSize(20);
  
        ReactiveRow first = rows.get(0);
        ExecutionInfo firstExecutionInfo = first.getExecutionInfo();
        assertThat(firstExecutionInfo.getCoordinator()).isEqualTo(node1);
        assertThat(firstExecutionInfo.getErrors()).isEmpty();
        assertThat(firstExecutionInfo.getIncomingPayload()).isEmpty();
        assertThat(firstExecutionInfo.getPagingState()).isNotNull();
        assertThat(firstExecutionInfo.getSpeculativeExecutionCount()).isEqualTo(0);
        assertThat(firstExecutionInfo.getSuccessfulExecutionIndex()).isEqualTo(0);
        assertThat(firstExecutionInfo.getWarnings()).isEmpty();
  
        ReactiveRow inSecondPage = rows.get(10);
        ExecutionInfo secondExecutionInfo = inSecondPage.getExecutionInfo();
        assertThat(secondExecutionInfo).isSameAs(mockInfo);
  
        Flowable<ExecutionInfo> execInfosFlowable =
            Flowable.fromPublisher(publisher.getExecutionInfos());
        assertThat(execInfosFlowable.toList().blockingGet())
            .containsExactly(firstExecutionInfo, secondExecutionInfo);
  
        Flowable<ColumnDefinitions> colDefsFlowable =
            Flowable.fromPublisher(publisher.getColumnDefinitions());
        assertThat(colDefsFlowable.toList().blockingGet())
            .containsExactly(first.getColumnDefinitions());
  
        Flowable<Boolean> wasAppliedFlowable = Flowable.fromPublisher(publisher.wasApplied());
        assertThat(wasAppliedFlowable.toList().blockingGet()).containsExactly(first.wasApplied());
      }
    }
  }
  