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.ArrayList;
  import java.util.Collection;
  import java.util.List;
  import java.util.function.Predicate;
  
  import com.carrotsearch.hppc.ObjectIntHashMap;
  import com.carrotsearch.hppc.ObjectObjectHashMap;
  
  import com.google.common.collect.Iterables;
  
  import static com.google.common.collect.Iterables.all;
  
  public class Replicas
  {
  
      public static int countFull(ReplicaCollection<?> replicas)
      {
          int count = 0;
          for (Replica replica : replicas)
              if (replica.isFull())
                  ++count;
          return count;
      }
  
      public static class ReplicaCount
      {
          int fullReplicas;
          int transientReplicas;
  
          public int allReplicas()
          {
              return fullReplicas + transientReplicas;
          }
  
          public int fullReplicas()
          {
              return fullReplicas;
          }
  
          public int transientReplicas()
          {
              return transientReplicas;
          }
  
          public void increment(Replica replica)
          {
              if (replica.isFull()) ++fullReplicas;
              else ++transientReplicas;
          }
  
          public boolean hasAtleast(int allReplicas, int fullReplicas)
          {
              return this.fullReplicas >= fullReplicas
                      && this.allReplicas() >= allReplicas;
          }
      }
  
      public static ReplicaCount countInOurDc(ReplicaCollection<?> replicas)
      {
          ReplicaCount count = new ReplicaCount();
          Predicate<Replica> inOurDc = InOurDc.replicas();
          for (Replica replica : replicas)
              if (inOurDc.test(replica))
                  count.increment(replica);
          return count;
      }
  
      /**
       * count the number of full and transient replicas, separately, for each DC
       */
      public static ObjectObjectHashMap<String, ReplicaCount> countPerDc(Locator locator, Collection<String> dataCenters, Iterable<Replica> replicas)
      {
          ObjectObjectHashMap<String, ReplicaCount> perDc = new ObjectObjectHashMap<>(dataCenters.size());
          for (String dc: dataCenters)
              perDc.put(dc, new ReplicaCount());
  
          for (Replica replica : replicas)
          {
              String dc = locator.location(replica.endpoint()).datacenter;
              perDc.get(dc).increment(replica);
          }
          return perDc;
      }
  
      /**
       * increment each of the map's DC entries for each matching replica provided
       */
      public static void addToCountPerDc(Locator locator, ObjectIntHashMap<String> perDc, Iterable<Replica> replicas, int add)
      {
          for (Replica replica : replicas)
          {
              String dc = locator.location(replica.endpoint()).datacenter;
              perDc.addTo(dc, add);
          }
      }
  
      /**
       * A placeholder for areas of the code that cannot yet handle transient replicas, but should do so in future
       */
      public static void temporaryAssertFull(Replica replica)
      {
          if (!replica.isFull())
          {
              throw new UnsupportedOperationException("transient replicas are currently unsupported: " + replica);
          }
      }
  
      /**
       * A placeholder for areas of the code that cannot yet handle transient replicas, but should do so in future
       */
      public static void temporaryAssertFull(Iterable<Replica> replicas)
      {
          if (!all(replicas, Replica::isFull))
          {
              throw new UnsupportedOperationException("transient replicas are currently unsupported: " + Iterables.toString(replicas));
          }
      }
  
      /**
       * For areas of the code that should never see a transient replica
       */
      public static void assertFull(Iterable<Replica> replicas)
      {
          if (!all(replicas, Replica::isFull))
          {
              throw new UnsupportedOperationException("transient replicas are currently unsupported: " + Iterables.toString(replicas));
          }
      }
  
      public static List<String> stringify(ReplicaCollection<?> replicas, boolean withPort)
      {
          List<String> stringEndpoints = new ArrayList<>(replicas.size());
          for (Replica replica: replicas)
          {
              stringEndpoints.add(replica.endpoint().getHostAddress(withPort));
          }
          return stringEndpoints;
      }
  
  }
  