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.concurrent.atomic.AtomicIntegerFieldUpdater;
  import java.util.function.Supplier;
  
  import org.apache.cassandra.db.Mutation;
  import org.apache.cassandra.locator.ReplicaPlan;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.db.WriteType;
  import org.apache.cassandra.utils.FBUtilities;
  import org.apache.cassandra.transport.Dispatcher;
  
  /**
   * Handles blocking writes for ONE, ANY, TWO, THREE, QUORUM, and ALL consistency levels.
   */
  public class WriteResponseHandler<T> extends AbstractWriteResponseHandler<T>
  {
      protected static final Logger logger = LoggerFactory.getLogger(WriteResponseHandler.class);
  
      protected volatile int responses;
      private static final AtomicIntegerFieldUpdater<WriteResponseHandler> responsesUpdater
              = AtomicIntegerFieldUpdater.newUpdater(WriteResponseHandler.class, "responses");
  
      public WriteResponseHandler(ReplicaPlan.ForWrite replicaPlan,
                                  Runnable callback,
                                  WriteType writeType,
                                  Supplier<Mutation> hintOnFailure,
                                  Dispatcher.RequestTime requestTime)
      {
          super(replicaPlan, callback, writeType, hintOnFailure, requestTime);
          responses = blockFor();
      }
  
      public WriteResponseHandler(ReplicaPlan.ForWrite replicaPlan, WriteType writeType, Supplier<Mutation> hintOnFailure, Dispatcher.RequestTime requestTime)
      {
          this(replicaPlan, null, writeType, hintOnFailure, requestTime);
      }
  
      public void onResponse(Message<T> m)
      {
          replicaPlan.collectSuccess(m == null ? FBUtilities.getBroadcastAddressAndPort() : m.from());
          if (responsesUpdater.decrementAndGet(this) == 0)
              signal();
          //Must be last after all subclass processing
          //The two current subclasses both assume logResponseToIdealCLDelegate is called
          //here.
          logResponseToIdealCLDelegate(m);
      }
  
      protected int ackCount()
      {
          return blockFor() - responses;
      }
  }
  