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   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * 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
   * limitations under the License.
   */
  
  package com.datastax.oss.driver.core.loadbalancing;
  
  import static com.datastax.oss.simulacron.common.stubbing.PrimeDsl.unavailable;
  import static com.datastax.oss.simulacron.common.stubbing.PrimeDsl.when;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Fail.fail;
  import static org.awaitility.Awaitility.await;
  
  import com.datastax.oss.driver.api.core.AllNodesFailedException;
  import com.datastax.oss.driver.api.core.CqlSession;
  import com.datastax.oss.driver.api.core.NoNodeAvailableException;
  import com.datastax.oss.driver.api.core.cql.ResultSet;
  import com.datastax.oss.driver.api.core.cql.SimpleStatement;
  import com.datastax.oss.driver.api.core.cql.Statement;
  import com.datastax.oss.driver.api.core.metadata.Node;
  import com.datastax.oss.driver.api.core.metadata.NodeState;
  import com.datastax.oss.driver.api.core.servererrors.UnavailableException;
  import com.datastax.oss.driver.api.testinfra.session.SessionRule;
  import com.datastax.oss.driver.api.testinfra.simulacron.SimulacronRule;
  import com.datastax.oss.driver.categories.ParallelizableTests;
  import com.datastax.oss.simulacron.common.cluster.ClusterSpec;
  import com.datastax.oss.simulacron.common.codec.ConsistencyLevel;
  import com.datastax.oss.simulacron.server.BoundNode;
  import java.net.InetSocketAddress;
  import java.util.concurrent.TimeUnit;
  import org.junit.Before;
  import org.junit.ClassRule;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.rules.RuleChain;
  import org.junit.rules.TestRule;
  
  @Category(ParallelizableTests.class)
  public class NodeTargetingIT {
  
    private static final SimulacronRule SIMULACRON_RULE =
        new SimulacronRule(ClusterSpec.builder().withNodes(5));
  
    private static final SessionRule<CqlSession> SESSION_RULE =
        SessionRule.builder(SIMULACRON_RULE).build();
  
    @ClassRule
    public static final TestRule CHAIN = RuleChain.outerRule(SIMULACRON_RULE).around(SESSION_RULE);
  
    @Before
    public void clear() {
      SIMULACRON_RULE.cluster().clearLogs();
      SIMULACRON_RULE.cluster().clearPrimes(true);
      SIMULACRON_RULE.cluster().node(4).stop();
      await()
          .pollInterval(500, TimeUnit.MILLISECONDS)
          .atMost(5, TimeUnit.SECONDS)
          .until(() -> getNode(4).getState() == NodeState.DOWN);
    }
  
    @Test
    public void should_use_node_on_statement() {
      for (int i = 0; i < 10; i++) {
        int nodeIndex = i % 3 + 1;
        Node node = getNode(nodeIndex);
  
        // given a statement with node explicitly set.
        Statement statement = SimpleStatement.newInstance("select * system.local").setNode(node);
  
        // when statement is executed
        ResultSet result = SESSION_RULE.session().execute(statement);
  
        // then the query should have been sent to the configured node.
        assertThat(result.getExecutionInfo().getCoordinator()).isEqualTo(node);
      }
    }
  
    @Test
    public void should_fail_if_node_fails_query() {
      String query = "mock";
      SIMULACRON_RULE
          .cluster()
          .node(3)
          .prime(when(query).then(unavailable(ConsistencyLevel.ALL, 1, 0)));
  
      // given a statement with a node configured to fail the given query.
      Node node3 = getNode(3);
      Statement statement = SimpleStatement.newInstance(query).setNode(node3);
      // when statement is executed an error should be raised.
      try {
        SESSION_RULE.session().execute(statement);
        fail("Should have thrown AllNodesFailedException");
      } catch (AllNodesFailedException e) {
        assertThat(e.getAllErrors().size()).isEqualTo(1);
        assertThat(e.getAllErrors().get(node3).get(0)).isInstanceOf(UnavailableException.class);
      }
    }
  
    @Test
    public void should_fail_if_node_is_not_connected() {
      // given a statement with node explicitly set that for which we have no active pool.
      Node node4 = getNode(4);
  
      Statement statement = SimpleStatement.newInstance("select * system.local").setNode(node4);
      try {
        // when statement is executed
        SESSION_RULE.session().execute(statement);
        fail("Query should have failed");
      } catch (NoNodeAvailableException e) {
        assertThat(e.getAllErrors()).isEmpty();
      } catch (AllNodesFailedException e) {
        // its also possible that the query is tried.  This can happen if the node was marked
        // down, but not all connections have been closed yet.  In this case, just verify that
        // the expected host failed.
        assertThat(e.getAllErrors().size()).isEqualTo(1);
        assertThat(e.getAllErrors()).containsOnlyKeys(node4);
      }
    }
  
    private Node getNode(int id) {
      BoundNode boundNode = SIMULACRON_RULE.cluster().node(id);
      assertThat(boundNode).isNotNull();
      InetSocketAddress address = (InetSocketAddress) boundNode.getAddress();
      return SESSION_RULE
          .session()
          .getMetadata()
          .findNode(address)
          .orElseThrow(
              () -> new AssertionError(String.format("Expected to find node %d in metadata", id)));
    }
  }
  