content: /*
   * 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.internal.core.metadata;
  
  import com.datastax.oss.driver.api.core.metadata.Node;
  import com.datastax.oss.driver.internal.core.context.InternalDriverContext;
  import com.datastax.oss.driver.shaded.guava.common.annotations.VisibleForTesting;
  import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableList;
  import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableMap;
  import java.util.Map;
  import java.util.UUID;
  import net.jcip.annotations.ThreadSafe;
  
  @ThreadSafe
  public class AddNodeRefresh extends NodesRefresh {
  
    @VisibleForTesting final NodeInfo newNodeInfo;
  
    AddNodeRefresh(NodeInfo newNodeInfo) {
      this.newNodeInfo = newNodeInfo;
    }
  
    @Override
    public Result compute(
        DefaultMetadata oldMetadata, boolean tokenMapEnabled, InternalDriverContext context) {
      Map<UUID, Node> oldNodes = oldMetadata.getNodes();
      Node existing = oldNodes.get(newNodeInfo.getHostId());
      if (existing == null) {
        DefaultNode newNode = new DefaultNode(newNodeInfo.getEndPoint(), context);
        copyInfos(newNodeInfo, newNode, context);
        Map<UUID, Node> newNodes =
            ImmutableMap.<UUID, Node>builder()
                .putAll(oldNodes)
                .put(newNode.getHostId(), newNode)
                .build();
        return new Result(
            oldMetadata.withNodes(newNodes, tokenMapEnabled, false, null, context),
            ImmutableList.of(NodeStateEvent.added(newNode)));
      } else {
        // If a node is restarted after changing its broadcast RPC address, Cassandra considers that
        // an addition, even though the host_id hasn't changed :(
        // Update the existing instance and emit an UP event to trigger a pool reconnection.
        if (!existing.getEndPoint().equals(newNodeInfo.getEndPoint())) {
          copyInfos(newNodeInfo, ((DefaultNode) existing), context);
          assert newNodeInfo.getBroadcastRpcAddress().isPresent(); // always for peer nodes
          return new Result(
              oldMetadata,
              ImmutableList.of(TopologyEvent.suggestUp(newNodeInfo.getBroadcastRpcAddress().get())));
        } else {
          return new Result(oldMetadata);
        }
      }
    }
  }
  