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 org.apache.cassandra.db.Mutation;
  import org.apache.cassandra.db.WriteType;
  import org.apache.cassandra.locator.InOurDc;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.locator.ReplicaPlan;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.transport.Dispatcher;
  
  import java.util.function.Predicate;
  import java.util.function.Supplier;
  
  /**
   * This class blocks for a quorum of responses _in the local datacenter only_ (CL.LOCAL_QUORUM).
   */
  public class DatacenterWriteResponseHandler<T> extends WriteResponseHandler<T>
  {
      private final Predicate<InetAddressAndPort> waitingFor = InOurDc.endpoints();
  
      public DatacenterWriteResponseHandler(ReplicaPlan.ForWrite replicaPlan,
                                            Runnable callback,
                                            WriteType writeType,
                                            Supplier<Mutation> hintOnFailure,
                                            Dispatcher.RequestTime requestTime)
      {
          super(replicaPlan, callback, writeType, hintOnFailure, requestTime);
          assert replicaPlan.consistencyLevel().isDatacenterLocal();
      }
  
      @Override
      public void onResponse(Message<T> message)
      {
          if (message == null || waitingFor(message.from()))
          {
              super.onResponse(message);
          }
          else
          {
              //WriteResponseHandler.response will call logResonseToIdealCLDelegate so only do it if not calling WriteResponseHandler.response.
              //Must be last after all subclass processing
              logResponseToIdealCLDelegate(message);
          }
      }
  
      @Override
      protected boolean waitingFor(InetAddressAndPort from)
      {
          return waitingFor.test(from);
      }
  }
  