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.internal.core.metadata.token.DefaultTokenMap;
  import com.datastax.oss.driver.internal.core.metadata.token.TokenFactory;
  import com.datastax.oss.driver.internal.core.metadata.token.TokenFactoryRegistry;
  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 com.datastax.oss.driver.shaded.guava.common.collect.Sets;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  import java.util.UUID;
  import net.jcip.annotations.ThreadSafe;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  @ThreadSafe
  class FullNodeListRefresh extends NodesRefresh {
  
    private static final Logger LOG = LoggerFactory.getLogger(FullNodeListRefresh.class);
  
    @VisibleForTesting final Iterable<NodeInfo> nodeInfos;
  
    FullNodeListRefresh(Iterable<NodeInfo> nodeInfos) {
      this.nodeInfos = nodeInfos;
    }
  
    @Override
    public Result compute(
        DefaultMetadata oldMetadata, boolean tokenMapEnabled, InternalDriverContext context) {
  
      String logPrefix = context.getSessionName();
      TokenFactoryRegistry tokenFactoryRegistry = context.getTokenFactoryRegistry();
  
      Map<UUID, Node> oldNodes = oldMetadata.getNodes();
  
      Map<UUID, Node> added = new HashMap<>();
      Set<UUID> seen = new HashSet<>();
  
      TokenFactory tokenFactory =
          oldMetadata.getTokenMap().map(m -> ((DefaultTokenMap) m).getTokenFactory()).orElse(null);
      boolean tokensChanged = false;
  
      for (NodeInfo nodeInfo : nodeInfos) {
        UUID id = nodeInfo.getHostId();
        if (seen.contains(id)) {
          LOG.warn(
              "[{}] Found duplicate entries with host_id {} in system.peers, "
                  + "keeping only the first one",
              logPrefix,
              id);
        } else {
          seen.add(id);
          DefaultNode node = (DefaultNode) oldNodes.get(id);
          if (node == null) {
            node = new DefaultNode(nodeInfo.getEndPoint(), context);
            LOG.debug("[{}] Adding new node {}", logPrefix, node);
            added.put(id, node);
          }
          if (tokenFactory == null && nodeInfo.getPartitioner() != null) {
            tokenFactory = tokenFactoryRegistry.tokenFactoryFor(nodeInfo.getPartitioner());
          }
          tokensChanged |= copyInfos(nodeInfo, node, context);
        }
      }
  
      Set<UUID> removed = Sets.difference(oldNodes.keySet(), seen);
  
      if (added.isEmpty() && removed.isEmpty()) { // The list didn't change
        if (!oldMetadata.getTokenMap().isPresent() && tokenFactory != null) {
          // First time we found out what the partitioner is => set the token factory and trigger a
          // token map rebuild:
          return new Result(
              oldMetadata.withNodes(
                  oldMetadata.getNodes(), tokenMapEnabled, true, tokenFactory, context));
        } else {
          // No need to create a new metadata instance
          return new Result(oldMetadata);
        }
      } else {
        ImmutableMap.Builder<UUID, Node> newNodesBuilder = ImmutableMap.builder();
        ImmutableList.Builder<Object> eventsBuilder = ImmutableList.builder();
  
        newNodesBuilder.putAll(added);
        for (Map.Entry<UUID, Node> entry : oldNodes.entrySet()) {
          if (!removed.contains(entry.getKey())) {
            newNodesBuilder.put(entry.getKey(), entry.getValue());
          }
        }
  
        for (Node node : added.values()) {
          eventsBuilder.add(NodeStateEvent.added((DefaultNode) node));
        }
        for (UUID id : removed) {
          Node node = oldNodes.get(id);
          eventsBuilder.add(NodeStateEvent.removed((DefaultNode) node));
        }
  
        return new Result(
            oldMetadata.withNodes(
                newNodesBuilder.build(), tokenMapEnabled, tokensChanged, tokenFactory, context),
            eventsBuilder.build());
      }
    }
  }
  