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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
   * 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,
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   * See the License for the specific language governing permissions and
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  package com.datastax.dse.driver.internal.core.cql.continuous;
  
  import static com.datastax.oss.driver.Assertions.assertThatStage;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.ArgumentMatchers.anyString;
  import static org.mockito.Mockito.never;
  
  import com.datastax.dse.driver.DseTestDataProviders;
  import com.datastax.dse.driver.DseTestFixtures;
  import com.datastax.dse.driver.api.core.DseProtocolVersion;
  import com.datastax.dse.driver.api.core.cql.continuous.ContinuousAsyncResultSet;
  import com.datastax.oss.driver.api.core.AllNodesFailedException;
  import com.datastax.oss.driver.api.core.NodeUnavailableException;
  import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
  import com.datastax.oss.driver.api.core.metadata.Node;
  import com.datastax.oss.driver.api.core.session.Request;
  import com.datastax.oss.driver.api.core.session.Session;
  import com.datastax.oss.driver.internal.core.cql.RequestHandlerTestHarness;
  import com.datastax.oss.driver.internal.core.metadata.LoadBalancingPolicyWrapper;
  import com.tngtech.java.junit.dataprovider.UseDataProvider;
  import java.util.List;
  import java.util.Map;
  import java.util.concurrent.CompletionStage;
  import org.junit.Test;
  import org.mockito.InOrder;
  import org.mockito.Mockito;
  
  public class ContinuousCqlRequestHandlerNodeTargetingTest
      extends ContinuousCqlRequestHandlerTestBase {
  
    @Test
    @UseDataProvider(value = "allDseProtocolVersions", location = DseTestDataProviders.class)
    public void should_fail_if_targeted_node_not_available(DseProtocolVersion version) {
      try (RequestHandlerTestHarness harness =
          continuousHarnessBuilder()
              .withResponse(node1, defaultFrameOf(DseTestFixtures.singleDseRow()))
              .withResponse(node2, defaultFrameOf(DseTestFixtures.singleDseRow()))
              .withEmptyPool(node3)
              .withProtocolVersion(version)
              .build()) {
  
        LoadBalancingPolicyWrapper loadBalancingPolicy =
            harness.getContext().getLoadBalancingPolicyWrapper();
        InOrder invocations = Mockito.inOrder(loadBalancingPolicy);
  
        // target node3, which should be unavailable
        CompletionStage<ContinuousAsyncResultSet> resultSetFuture =
            new ContinuousCqlRequestHandler(
                    UNDEFINED_IDEMPOTENCE_STATEMENT.setNode(node3),
                    harness.getSession(),
                    harness.getContext(),
                    "target node 3, unavailable")
                .handle();
  
        assertThatStage(resultSetFuture)
            .isFailed(
                error -> {
                  assertThat(error).isInstanceOf(AllNodesFailedException.class);
                  Map<Node, List<Throwable>> errors =
                      ((AllNodesFailedException) error).getAllErrors();
                  assertThat(errors).hasSize(1);
                  List<Throwable> nodeErrors = errors.values().iterator().next();
                  assertThat(nodeErrors).singleElement().isInstanceOf(NodeUnavailableException.class);
                  invocations
                      .verify(loadBalancingPolicy, never())
                      .newQueryPlan(any(Request.class), anyString(), any(Session.class));
                });
  
        resultSetFuture =
            new ContinuousCqlRequestHandler(
                    UNDEFINED_IDEMPOTENCE_STATEMENT,
                    harness.getSession(),
                    harness.getContext(),
                    "no node targeting, should use node 1")
                .handle();
  
        assertThatStage(resultSetFuture)
            .isSuccess(
                resultSet -> {
                  assertThat(resultSet.getExecutionInfo().getCoordinator()).isEqualTo(node1);
                  invocations
                      .verify(loadBalancingPolicy)
                      .newQueryPlan(
                          UNDEFINED_IDEMPOTENCE_STATEMENT,
                          DriverExecutionProfile.DEFAULT_NAME,
                          harness.getSession());
                });
  
        resultSetFuture =
            new ContinuousCqlRequestHandler(
                    UNDEFINED_IDEMPOTENCE_STATEMENT,
                    harness.getSession(),
                    harness.getContext(),
                    "no node targeting, should use node 2")
                .handle();
  
        assertThatStage(resultSetFuture)
            .isSuccess(
                resultSet -> {
                  assertThat(resultSet.getExecutionInfo().getCoordinator()).isEqualTo(node2);
                  invocations
                      .verify(loadBalancingPolicy)
                      .newQueryPlan(
                          UNDEFINED_IDEMPOTENCE_STATEMENT,
                          DriverExecutionProfile.DEFAULT_NAME,
                          harness.getSession());
                });
      }
    }
  
    @Test
    @UseDataProvider(value = "allDseProtocolVersions", location = DseTestDataProviders.class)
    public void should_target_node(DseProtocolVersion version) {
      try (RequestHandlerTestHarness harness =
          continuousHarnessBuilder()
              .withResponse(node1, defaultFrameOf(DseTestFixtures.singleDseRow()))
              .withResponse(node2, defaultFrameOf(DseTestFixtures.singleDseRow()))
              .withResponse(node3, defaultFrameOf(DseTestFixtures.singleDseRow()))
              .withProtocolVersion(version)
              .build()) {
  
        LoadBalancingPolicyWrapper loadBalancingPolicy =
            harness.getContext().getLoadBalancingPolicyWrapper();
        InOrder invocations = Mockito.inOrder(loadBalancingPolicy);
  
        CompletionStage<ContinuousAsyncResultSet> resultSetFuture =
            new ContinuousCqlRequestHandler(
                    UNDEFINED_IDEMPOTENCE_STATEMENT.setNode(node3),
                    harness.getSession(),
                    harness.getContext(),
                    "target node 3")
                .handle();
  
        assertThatStage(resultSetFuture)
            .isSuccess(
                resultSet -> {
                  assertThat(resultSet.getExecutionInfo().getCoordinator()).isEqualTo(node3);
                  invocations
                      .verify(loadBalancingPolicy, never())
                      .newQueryPlan(any(Request.class), anyString(), any(Session.class));
                });
  
        resultSetFuture =
            new ContinuousCqlRequestHandler(
                    UNDEFINED_IDEMPOTENCE_STATEMENT,
                    harness.getSession(),
                    harness.getContext(),
                    "no node targeting")
                .handle();
  
        assertThatStage(resultSetFuture)
            .isSuccess(
                resultSet -> {
                  assertThat(resultSet.getExecutionInfo().getCoordinator()).isEqualTo(node1);
                  invocations
                      .verify(loadBalancingPolicy)
                      .newQueryPlan(
                          UNDEFINED_IDEMPOTENCE_STATEMENT,
                          DriverExecutionProfile.DEFAULT_NAME,
                          harness.getSession());
                });
      }
    }
  }
  