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.service;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.concurrent.atomic.AtomicInteger;
  import java.util.function.Supplier;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.db.Mutation;
  import org.apache.cassandra.locator.Locator;
  import org.apache.cassandra.locator.NetworkTopologyStrategy;
  import org.apache.cassandra.locator.Replica;
  import org.apache.cassandra.locator.ReplicaPlan;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.db.ConsistencyLevel;
  import org.apache.cassandra.db.WriteType;
  import org.apache.cassandra.transport.Dispatcher;
  
  /**
   * This class blocks for a quorum of responses _in all datacenters_ (CL.EACH_QUORUM).
   */
  public class DatacenterSyncWriteResponseHandler<T> extends AbstractWriteResponseHandler<T>
  {
      private static final Locator locator = DatabaseDescriptor.getLocator();
  
      private final Map<String, AtomicInteger> responses = new HashMap<String, AtomicInteger>();
      private final AtomicInteger acks = new AtomicInteger(0);
  
      public DatacenterSyncWriteResponseHandler(ReplicaPlan.ForWrite replicaPlan,
                                                Runnable callback,
                                                WriteType writeType,
                                                Supplier<Mutation> hintOnFailure,
                                                Dispatcher.RequestTime requestTime)
      {
          // Response is been managed by the map so make it 1 for the superclass.
          super(replicaPlan, callback, writeType, hintOnFailure, requestTime);
          assert replicaPlan.consistencyLevel() == ConsistencyLevel.EACH_QUORUM;
  
          if (replicaPlan.replicationStrategy() instanceof NetworkTopologyStrategy)
          {
              NetworkTopologyStrategy strategy = (NetworkTopologyStrategy) replicaPlan.replicationStrategy();
              for (String dc : strategy.getDatacenters())
              {
                  int rf = strategy.getReplicationFactor(dc).allReplicas;
                  responses.put(dc, new AtomicInteger((rf / 2) + 1));
              }
          }
          else
          {
              responses.put(locator.local().datacenter, new AtomicInteger(ConsistencyLevel.quorumFor(replicaPlan.replicationStrategy())));
          }
  
          // During bootstrap, we have to include the pending endpoints or we may fail the consistency level
          // guarantees (see #833)
          for (Replica pending : replicaPlan.pending())
          {
              responses.get(locator.location(pending.endpoint()).datacenter).incrementAndGet();
          }
      }
  
      public void onResponse(Message<T> message)
      {
          try
          {
              String dataCenter = message == null
                                  ? locator.local().datacenter
                                  : locator.location(message.from()).datacenter;
  
              responses.get(dataCenter).getAndDecrement();
              acks.incrementAndGet();
  
              for (AtomicInteger i : responses.values())
              {
                  if (i.get() > 0)
                      return;
              }
  
              // all the quorum conditions are met
              signal();
          }
          finally
          {
              //Must be last after all subclass processing
              logResponseToIdealCLDelegate(message);
          }
      }
  
      protected int ackCount()
      {
          return acks.get();
      }
  }
  