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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.
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  package com.datastax.oss.driver.internal.core.pool;
  
  import static com.datastax.oss.driver.Assertions.assertThat;
  import static com.datastax.oss.driver.Assertions.assertThatStage;
  import static org.awaitility.Awaitility.await;
  import static org.mockito.Mockito.inOrder;
  import static org.mockito.Mockito.never;
  import static org.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  import com.datastax.oss.driver.api.core.InvalidKeyspaceException;
  import com.datastax.oss.driver.api.core.config.DefaultDriverOption;
  import com.datastax.oss.driver.api.core.loadbalancing.NodeDistance;
  import com.datastax.oss.driver.api.core.metrics.DefaultNodeMetric;
  import com.datastax.oss.driver.internal.core.channel.ChannelEvent;
  import com.datastax.oss.driver.internal.core.channel.ClusterNameMismatchException;
  import com.datastax.oss.driver.internal.core.channel.DriverChannel;
  import com.datastax.oss.driver.internal.core.channel.MockChannelFactoryHelper;
  import com.datastax.oss.driver.internal.core.metadata.TopologyEvent;
  import java.time.Duration;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.CompletionStage;
  import org.junit.Test;
  import org.mockito.InOrder;
  
  public class ChannelPoolInitTest extends ChannelPoolTestBase {
  
    @Test
    public void should_initialize_when_all_channels_succeed() throws Exception {
      when(defaultProfile.getInt(DefaultDriverOption.CONNECTION_POOL_LOCAL_SIZE)).thenReturn(3);
  
      DriverChannel channel1 = newMockDriverChannel(1);
      DriverChannel channel2 = newMockDriverChannel(2);
      DriverChannel channel3 = newMockDriverChannel(3);
      MockChannelFactoryHelper factoryHelper =
          MockChannelFactoryHelper.builder(channelFactory)
              .success(node, channel1)
              .success(node, channel2)
              .success(node, channel3)
              .build();
  
      CompletionStage<ChannelPool> poolFuture =
          ChannelPool.init(node, null, NodeDistance.LOCAL, context, "test");
  
      factoryHelper.waitForCalls(node, 3);
  
      assertThatStage(poolFuture)
          .isSuccess(pool -> assertThat(pool.channels).containsOnly(channel1, channel2, channel3));
      verify(eventBus, VERIFY_TIMEOUT.times(3)).fire(ChannelEvent.channelOpened(node));
  
      factoryHelper.verifyNoMoreCalls();
    }
  
    @Test
    public void should_initialize_when_all_channels_fail() throws Exception {
      when(defaultProfile.getInt(DefaultDriverOption.CONNECTION_POOL_LOCAL_SIZE)).thenReturn(3);
  
      MockChannelFactoryHelper factoryHelper =
          MockChannelFactoryHelper.builder(channelFactory)
              .failure(node, "mock channel init failure")
              .failure(node, "mock channel init failure")
              .failure(node, "mock channel init failure")
              .build();
  
      CompletionStage<ChannelPool> poolFuture =
          ChannelPool.init(node, null, NodeDistance.LOCAL, context, "test");
  
      factoryHelper.waitForCalls(node, 3);
  
      assertThatStage(poolFuture).isSuccess(pool -> assertThat(pool.channels).isEmpty());
      verify(eventBus, never()).fire(ChannelEvent.channelOpened(node));
      verify(nodeMetricUpdater, VERIFY_TIMEOUT.times(3))
          .incrementCounter(DefaultNodeMetric.CONNECTION_INIT_ERRORS, null);
  
      factoryHelper.verifyNoMoreCalls();
    }
  
    @Test
    public void should_indicate_when_keyspace_failed_on_all_channels() {
      when(defaultProfile.getInt(DefaultDriverOption.CONNECTION_POOL_LOCAL_SIZE)).thenReturn(3);
  
      MockChannelFactoryHelper factoryHelper =
          MockChannelFactoryHelper.builder(channelFactory)
              .failure(node, new InvalidKeyspaceException("invalid keyspace"))
              .failure(node, new InvalidKeyspaceException("invalid keyspace"))
              .failure(node, new InvalidKeyspaceException("invalid keyspace"))
              .build();
  
      CompletionStage<ChannelPool> poolFuture =
          ChannelPool.init(node, null, NodeDistance.LOCAL, context, "test");
  
      factoryHelper.waitForCalls(node, 3);
      assertThatStage(poolFuture)
          .isSuccess(
              pool -> {
                assertThat(pool.isInvalidKeyspace()).isTrue();
                verify(nodeMetricUpdater, VERIFY_TIMEOUT.times(3))
                    .incrementCounter(DefaultNodeMetric.CONNECTION_INIT_ERRORS, null);
              });
    }
  
    @Test
    public void should_fire_force_down_event_when_cluster_name_does_not_match() throws Exception {
      when(defaultProfile.getInt(DefaultDriverOption.CONNECTION_POOL_LOCAL_SIZE)).thenReturn(3);
  
      ClusterNameMismatchException error =
          new ClusterNameMismatchException(node.getEndPoint(), "actual", "expected");
      MockChannelFactoryHelper factoryHelper =
          MockChannelFactoryHelper.builder(channelFactory)
              .failure(node, error)
              .failure(node, error)
              .failure(node, error)
              .build();
  
      ChannelPool.init(node, null, NodeDistance.LOCAL, context, "test");
  
      factoryHelper.waitForCalls(node, 3);
  
      verify(eventBus, VERIFY_TIMEOUT)
          .fire(TopologyEvent.forceDown(node.getBroadcastRpcAddress().get()));
      verify(eventBus, never()).fire(ChannelEvent.channelOpened(node));
  
      verify(nodeMetricUpdater, VERIFY_TIMEOUT.times(3))
          .incrementCounter(DefaultNodeMetric.CONNECTION_INIT_ERRORS, null);
      factoryHelper.verifyNoMoreCalls();
    }
  
    @Test
    public void should_reconnect_when_init_incomplete() throws Exception {
      // Short delay so we don't have to wait in the test
      when(reconnectionSchedule.nextDelay()).thenReturn(Duration.ofNanos(1));
  
      when(defaultProfile.getInt(DefaultDriverOption.CONNECTION_POOL_LOCAL_SIZE)).thenReturn(2);
  
      DriverChannel channel1 = newMockDriverChannel(1);
      DriverChannel channel2 = newMockDriverChannel(2);
      CompletableFuture<DriverChannel> channel2Future = new CompletableFuture<>();
      MockChannelFactoryHelper factoryHelper =
          MockChannelFactoryHelper.builder(channelFactory)
              // Init: 1 channel fails, the other succeeds
              .failure(node, "mock channel init failure")
              .success(node, channel1)
              // 1st reconnection
              .pending(node, channel2Future)
              .build();
      InOrder inOrder = inOrder(eventBus);
  
      CompletionStage<ChannelPool> poolFuture =
          ChannelPool.init(node, null, NodeDistance.LOCAL, context, "test");
  
      factoryHelper.waitForCalls(node, 2);
  
      assertThatStage(poolFuture).isSuccess();
      ChannelPool pool = poolFuture.toCompletableFuture().get();
      assertThat(pool.channels).containsOnly(channel1);
      inOrder.verify(eventBus, VERIFY_TIMEOUT).fire(ChannelEvent.channelOpened(node));
  
      // A reconnection should have been scheduled
      verify(reconnectionSchedule, VERIFY_TIMEOUT).nextDelay();
      inOrder.verify(eventBus, VERIFY_TIMEOUT).fire(ChannelEvent.reconnectionStarted(node));
  
      channel2Future.complete(channel2);
      factoryHelper.waitForCalls(node, 1);
      inOrder.verify(eventBus, VERIFY_TIMEOUT).fire(ChannelEvent.channelOpened(node));
      inOrder.verify(eventBus, VERIFY_TIMEOUT).fire(ChannelEvent.reconnectionStopped(node));
  
      await().untilAsserted(() -> assertThat(pool.channels).containsOnly(channel1, channel2));
  
      verify(nodeMetricUpdater, VERIFY_TIMEOUT)
          .incrementCounter(DefaultNodeMetric.CONNECTION_INIT_ERRORS, null);
      factoryHelper.verifyNoMoreCalls();
    }
  }
  