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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.mockito.Mockito.verify;
  import static org.mockito.Mockito.when;
  
  import com.datastax.oss.driver.api.core.CqlIdentifier;
  import com.datastax.oss.driver.api.core.config.DefaultDriverOption;
  import com.datastax.oss.driver.api.core.loadbalancing.NodeDistance;
  import com.datastax.oss.driver.internal.core.channel.ChannelEvent;
  import com.datastax.oss.driver.internal.core.channel.DriverChannel;
  import com.datastax.oss.driver.internal.core.channel.MockChannelFactoryHelper;
  import java.time.Duration;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.CompletionStage;
  import org.junit.Test;
  
  public class ChannelPoolKeyspaceTest extends ChannelPoolTestBase {
  
    @Test
    public void should_switch_keyspace_on_existing_channels() throws Exception {
      when(defaultProfile.getInt(DefaultDriverOption.CONNECTION_POOL_LOCAL_SIZE)).thenReturn(2);
  
      DriverChannel channel1 = newMockDriverChannel(1);
      DriverChannel channel2 = newMockDriverChannel(2);
      MockChannelFactoryHelper factoryHelper =
          MockChannelFactoryHelper.builder(channelFactory)
              .success(node, channel1)
              .success(node, channel2)
              .build();
  
      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, channel2);
  
      CqlIdentifier newKeyspace = CqlIdentifier.fromCql("new_keyspace");
      CompletionStage<Void> setKeyspaceFuture = pool.setKeyspace(newKeyspace);
  
      verify(channel1, VERIFY_TIMEOUT).setKeyspace(newKeyspace);
      verify(channel2, VERIFY_TIMEOUT).setKeyspace(newKeyspace);
  
      assertThatStage(setKeyspaceFuture).isSuccess();
  
      factoryHelper.verifyNoMoreCalls();
    }
  
    @Test
    public void should_switch_keyspace_on_pending_channels() throws Exception {
      when(reconnectionSchedule.nextDelay()).thenReturn(Duration.ofNanos(1));
  
      when(defaultProfile.getInt(DefaultDriverOption.CONNECTION_POOL_LOCAL_SIZE)).thenReturn(2);
  
      DriverChannel channel1 = newMockDriverChannel(1);
      CompletableFuture<DriverChannel> channel1Future = new CompletableFuture<>();
      DriverChannel channel2 = newMockDriverChannel(2);
      CompletableFuture<DriverChannel> channel2Future = new CompletableFuture<>();
      MockChannelFactoryHelper factoryHelper =
          MockChannelFactoryHelper.builder(channelFactory)
              // init
              .failure(node, "mock channel init failure")
              .failure(node, "mock channel init failure")
              // reconnection
              .pending(node, channel1Future)
              .pending(node, channel2Future)
              .build();
  
      CompletionStage<ChannelPool> poolFuture =
          ChannelPool.init(node, null, NodeDistance.LOCAL, context, "test");
  
      factoryHelper.waitForCalls(node, 2);
  
      assertThatStage(poolFuture).isSuccess();
      ChannelPool pool = poolFuture.toCompletableFuture().get();
  
      // Check that reconnection has kicked in, but do not complete it yet
      verify(reconnectionSchedule, VERIFY_TIMEOUT).nextDelay();
      verify(eventBus, VERIFY_TIMEOUT).fire(ChannelEvent.reconnectionStarted(node));
      factoryHelper.waitForCalls(node, 2);
  
      // Switch keyspace, it succeeds immediately since there is no active channel
      CqlIdentifier newKeyspace = CqlIdentifier.fromCql("new_keyspace");
      CompletionStage<Void> setKeyspaceFuture = pool.setKeyspace(newKeyspace);
      assertThatStage(setKeyspaceFuture).isSuccess();
  
      // Now let the two channels succeed to complete the reconnection
      channel1Future.complete(channel1);
      channel2Future.complete(channel2);
  
      verify(eventBus, VERIFY_TIMEOUT).fire(ChannelEvent.reconnectionStopped(node));
      verify(channel1, VERIFY_TIMEOUT).setKeyspace(newKeyspace);
      verify(channel2, VERIFY_TIMEOUT).setKeyspace(newKeyspace);
  
      factoryHelper.verifyNoMoreCalls();
    }
  }
  