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 org.apache.cassandra.locator;
  
  import java.util.List;
  import java.util.Objects;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  
  import com.google.common.base.Preconditions;
  import com.google.common.base.Predicates;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.gms.Gossiper;
  import org.apache.cassandra.utils.FBUtilities;
  
  public class ReplicationFactor
  {
      public static final ReplicationFactor ZERO = new ReplicationFactor(0);
  
      public final int allReplicas;
      public final int fullReplicas;
  
      private ReplicationFactor(int allReplicas, int transientReplicas)
      {
          validate(allReplicas, transientReplicas);
          this.allReplicas = allReplicas;
          this.fullReplicas = allReplicas - transientReplicas;
      }
  
      public int transientReplicas()
      {
          return allReplicas - fullReplicas;
      }
  
      public boolean hasTransientReplicas()
      {
          return allReplicas != fullReplicas;
      }
  
      private ReplicationFactor(int allReplicas)
      {
          this(allReplicas, 0);
      }
  
      static void validate(int totalRF, int transientRF)
      {
          Preconditions.checkArgument(transientRF == 0 || DatabaseDescriptor.isTransientReplicationEnabled(),
                                      "Transient replication is not enabled on this node");
          Preconditions.checkArgument(totalRF >= 0,
                                      "Replication factor must be non-negative, found %s", totalRF);
          Preconditions.checkArgument(transientRF == 0 || transientRF < totalRF,
                                      "Transient replicas must be zero, or less than total replication factor. For %s/%s", totalRF, transientRF);
          if (transientRF > 0)
          {
              Preconditions.checkArgument(DatabaseDescriptor.getNumTokens() == 1,
                                          "Transient nodes are not allowed with multiple tokens");
              Stream<InetAddressAndPort> endpoints = Stream.concat(Gossiper.instance.getLiveMembers().stream(), Gossiper.instance.getUnreachableMembers().stream());
              List<InetAddressAndPort> badVersionEndpoints = endpoints.filter(Predicates.not(FBUtilities.getBroadcastAddressAndPort()::equals))
                                                                      .filter(endpoint -> Gossiper.instance.getReleaseVersion(endpoint) != null && Gossiper.instance.getReleaseVersion(endpoint).major < 4)
                                                                      .collect(Collectors.toList());
              if (!badVersionEndpoints.isEmpty())
                  throw new IllegalArgumentException("Transient replication is not supported in mixed version clusters with nodes < 4.0. Bad nodes: " + badVersionEndpoints);
          }
          else if (transientRF < 0)
          {
              throw new IllegalArgumentException(String.format("Amount of transient nodes should be strictly positive, but was: '%d'", transientRF));
          }
      }
  
      public boolean equals(Object o)
      {
          if (this == o) return true;
          if (o == null || getClass() != o.getClass()) return false;
          ReplicationFactor that = (ReplicationFactor) o;
          return allReplicas == that.allReplicas && fullReplicas == that.fullReplicas;
      }
  
      public int hashCode()
      {
          return Objects.hash(allReplicas, fullReplicas);
      }
  
      public static ReplicationFactor fullOnly(int totalReplicas)
      {
          return new ReplicationFactor(totalReplicas);
      }
  
      public static ReplicationFactor withTransient(int totalReplicas, int transientReplicas)
      {
          return new ReplicationFactor(totalReplicas, transientReplicas);
      }
  
      public static ReplicationFactor fromString(String s)
      {
          if (s.contains("/"))
          {
              String[] parts = s.split("/");
              Preconditions.checkArgument(parts.length == 2,
                                          "Replication factor format is <replicas> or <replicas>/<transient>");
              return new ReplicationFactor(Integer.parseInt(parts[0]), Integer.parseInt(parts[1]));
          }
          else
          {
              return new ReplicationFactor(Integer.parseInt(s), 0);
          }
      }
  
      public String toParseableString()
      {
          return allReplicas + (hasTransientReplicas() ? "/" + transientReplicas() : "");
      }
  
      @Override
      public String toString()
      {
          return "rf(" + toParseableString() + ')';
      }
  }
  