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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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   *
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   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
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  package com.datastax.dse.driver.internal.core.graph.reactive;
  
  import static com.datastax.dse.driver.api.core.DseProtocolVersion.DSE_V1;
  import static com.datastax.dse.driver.internal.core.graph.GraphTestUtils.createGraphBinaryModule;
  import static com.datastax.dse.driver.internal.core.graph.GraphTestUtils.defaultDseFrameOf;
  import static com.datastax.dse.driver.internal.core.graph.GraphTestUtils.tenGraphRows;
  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.api.core.DseProtocolVersion;
  import com.datastax.dse.driver.api.core.graph.GraphStatement;
  import com.datastax.dse.driver.api.core.graph.ScriptGraphStatement;
  import com.datastax.dse.driver.api.core.graph.reactive.ReactiveGraphNode;
  import com.datastax.dse.driver.api.core.graph.reactive.ReactiveGraphResultSet;
  import com.datastax.dse.driver.internal.core.cql.continuous.ContinuousCqlRequestHandlerTestBase;
  import com.datastax.dse.driver.internal.core.graph.GraphProtocol;
  import com.datastax.dse.driver.internal.core.graph.GraphRequestAsyncProcessor;
  import com.datastax.dse.driver.internal.core.graph.GraphRequestHandlerTestHarness;
  import com.datastax.dse.driver.internal.core.graph.GraphSupportChecker;
  import com.datastax.dse.driver.internal.core.graph.binary.GraphBinaryModule;
  import com.datastax.oss.driver.api.core.cql.ExecutionInfo;
  import com.datastax.oss.driver.internal.core.context.DefaultDriverContext;
  import com.datastax.oss.driver.internal.core.cql.PoolBehavior;
  import com.datastax.oss.driver.internal.core.session.DefaultSession;
  import com.tngtech.java.junit.dataprovider.UseDataProvider;
  import io.reactivex.Flowable;
  import java.io.IOException;
  import java.util.List;
  import org.junit.Before;
  import org.junit.Test;
  import org.mockito.Mockito;
  
  public class ReactiveGraphRequestProcessorTest extends ContinuousCqlRequestHandlerTestBase {
  
    private GraphRequestAsyncProcessor asyncProcessor;
    private GraphSupportChecker graphSupportChecker;
  
    @Before
    public void setUp() {
      DefaultDriverContext context = mock(DefaultDriverContext.class);
      graphSupportChecker = mock(GraphSupportChecker.class);
      asyncProcessor = Mockito.spy(new GraphRequestAsyncProcessor(context, graphSupportChecker));
    }
  
    @Test
    public void should_be_able_to_process_graph_reactive_result_set() {
      ReactiveGraphRequestProcessor processor = new ReactiveGraphRequestProcessor(asyncProcessor);
      assertThat(
              processor.canProcess(
                  ScriptGraphStatement.newInstance("g.V()"),
                  ReactiveGraphRequestProcessor.REACTIVE_GRAPH_RESULT_SET))
          .isTrue();
    }
  
    @Test
    public void should_create_reactive_result_set() {
      GraphRequestHandlerTestHarness.Builder builder =
          GraphRequestHandlerTestHarness.builder().withProtocolVersion(DSE_V1);
      try (GraphRequestHandlerTestHarness harness = builder.build()) {
        ReactiveGraphRequestProcessor processor = new ReactiveGraphRequestProcessor(asyncProcessor);
        GraphStatement<?> graphStatement = ScriptGraphStatement.newInstance("g.V()");
        assertThat(
                processor.process(graphStatement, harness.getSession(), harness.getContext(), "test"))
            .isInstanceOf(DefaultReactiveGraphResultSet.class);
      }
    }
  
    @Test
    @UseDataProvider(
        value = "allDseProtocolVersionsAndSupportedGraphProtocols",
        location = DseTestDataProviders.class)
    public void should_complete_single_page_result(
        DseProtocolVersion version, GraphProtocol graphProtocol) throws IOException {
      when(graphSupportChecker.isPagingEnabled(any(), any())).thenReturn(false);
      when(graphSupportChecker.inferGraphProtocol(any(), any(), any())).thenReturn(graphProtocol);
  
      GraphRequestHandlerTestHarness.Builder builder =
          GraphRequestHandlerTestHarness.builder().withProtocolVersion(version);
      PoolBehavior node1Behavior = builder.customBehavior(node1);
      try (GraphRequestHandlerTestHarness harness = builder.build()) {
  
        DefaultSession session = harness.getSession();
        DefaultDriverContext context = harness.getContext();
        GraphStatement<?> graphStatement = ScriptGraphStatement.newInstance("g.V()");
  
        GraphBinaryModule graphBinaryModule = createGraphBinaryModule(context);
        when(asyncProcessor.getGraphBinaryModule()).thenReturn(graphBinaryModule);
  
        ReactiveGraphResultSet publisher =
            new ReactiveGraphRequestProcessor(asyncProcessor)
                .process(graphStatement, session, context, "test");
  
        Flowable<ReactiveGraphNode> rowsPublisher = Flowable.fromPublisher(publisher).cache();
        rowsPublisher.subscribe();
  
        // emulate single page
        node1Behavior.setResponseSuccess(
            defaultDseFrameOf(tenGraphRows(graphProtocol, graphBinaryModule, 1, true)));
  
        List<ReactiveGraphNode> rows = rowsPublisher.toList().blockingGet();
  
        assertThat(rows).hasSize(10);
        checkResultSet(rows);
  
        Flowable<ExecutionInfo> execInfosFlowable =
            Flowable.fromPublisher(publisher.getExecutionInfos());
        assertThat(execInfosFlowable.toList().blockingGet())
            .hasSize(1)
            .containsExactly(rows.get(0).getExecutionInfo());
      }
    }
  
    @Test
    @UseDataProvider(
        value = "allDseProtocolVersionsAndSupportedGraphProtocols",
        location = DseTestDataProviders.class)
    public void should_complete_multi_page_result(
        DseProtocolVersion version, GraphProtocol graphProtocol) throws IOException {
      when(graphSupportChecker.isPagingEnabled(any(), any())).thenReturn(true);
      when(graphSupportChecker.inferGraphProtocol(any(), any(), any())).thenReturn(graphProtocol);
  
      GraphRequestHandlerTestHarness.Builder builder =
          GraphRequestHandlerTestHarness.builder().withProtocolVersion(version);
      PoolBehavior node1Behavior = builder.customBehavior(node1);
      try (GraphRequestHandlerTestHarness harness = builder.build()) {
  
        DefaultSession session = harness.getSession();
        DefaultDriverContext context = harness.getContext();
        GraphStatement<?> graphStatement = ScriptGraphStatement.newInstance("g.V()");
  
        GraphBinaryModule graphBinaryModule = createGraphBinaryModule(context);
        when(asyncProcessor.getGraphBinaryModule()).thenReturn(graphBinaryModule);
  
        ReactiveGraphResultSet publisher =
            new ReactiveGraphRequestProcessor(asyncProcessor)
                .process(graphStatement, session, context, "test");
  
        Flowable<ReactiveGraphNode> rowsPublisher = Flowable.fromPublisher(publisher).cache();
        rowsPublisher.subscribe();
  
        // emulate page 1
        node1Behavior.setResponseSuccess(
            defaultDseFrameOf(tenGraphRows(graphProtocol, graphBinaryModule, 1, false)));
        // emulate page 2
        node1Behavior.setResponseSuccess(
            defaultDseFrameOf(tenGraphRows(graphProtocol, graphBinaryModule, 2, true)));
  
        List<ReactiveGraphNode> rows = rowsPublisher.toList().blockingGet();
        assertThat(rows).hasSize(20);
        checkResultSet(rows);
  
        Flowable<ExecutionInfo> execInfosFlowable =
            Flowable.fromPublisher(publisher.getExecutionInfos());
        assertThat(execInfosFlowable.toList().blockingGet())
            .hasSize(2)
            .containsExactly(rows.get(0).getExecutionInfo(), rows.get(10).getExecutionInfo());
      }
    }
  
    private void checkResultSet(List<ReactiveGraphNode> rows) {
      for (ReactiveGraphNode row : rows) {
        assertThat(row.isVertex()).isTrue();
        ExecutionInfo executionInfo = row.getExecutionInfo();
        assertThat(executionInfo.getCoordinator()).isEqualTo(node1);
        assertThat(executionInfo.getErrors()).isEmpty();
        assertThat(executionInfo.getIncomingPayload()).isEmpty();
        assertThat(executionInfo.getSpeculativeExecutionCount()).isEqualTo(0);
        assertThat(executionInfo.getSuccessfulExecutionIndex()).isEqualTo(0);
        assertThat(executionInfo.getWarnings()).isEmpty();
      }
    }
  }
  