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.reads.repair;
  
  import java.util.Map;
  
  import com.codahale.metrics.Meter;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.db.Mutation;
  import org.apache.cassandra.db.ReadCommand;
  import org.apache.cassandra.db.partitions.UnfilteredPartitionIterators;
  import org.apache.cassandra.locator.Endpoints;
  import org.apache.cassandra.locator.Replica;
  import org.apache.cassandra.locator.ReplicaPlan;
  import org.apache.cassandra.locator.ReplicaPlan.ForWrite;
  import org.apache.cassandra.metrics.ReadRepairMetrics;
  import org.apache.cassandra.transport.Dispatcher;
  import org.apache.cassandra.service.reads.ReadCoordinator;
  
  /**
   * Only performs the collection of data responses and reconciliation of them, doesn't send repair mutations
   * to replicas. This preserves write atomicity, but doesn't provide monotonic quorum reads
   */
  public class ReadOnlyReadRepair<E extends Endpoints<E>, P extends ReplicaPlan.ForRead<E, P>>
          extends AbstractReadRepair<E, P>
  {
      ReadOnlyReadRepair(ReadCoordinator coordinator, ReadCommand command, ReplicaPlan.Shared<E, P> replicaPlan, Dispatcher.RequestTime requestTime)
      {
          super(coordinator, command, replicaPlan, requestTime);
      }
  
      @Override
      public UnfilteredPartitionIterators.MergeListener getMergeListener(P replicaPlan)
      {
          return UnfilteredPartitionIterators.MergeListener.NOOP;
      }
  
      @Override
      Meter getRepairMeter()
      {
          return ReadRepairMetrics.reconcileRead;
      }
  
      @Override
      public void maybeSendAdditionalWrites()
      {
  
      }
  
      @Override
      public void repairPartition(DecoratedKey partitionKey, Map<Replica, Mutation> mutations, ReplicaPlan.ForWrite writePlan, ReadRepairSource rrSource)
      {
          throw new UnsupportedOperationException("ReadOnlyReadRepair shouldn't be trying to repair partitions");
      }
  
      @Override
      public void repairPartitionDirectly(ReadCoordinator coordinator, DecoratedKey partitionKey, Map<Replica, Mutation> mutations, ForWrite writePlan)
      {
          throw new UnsupportedOperationException("ReadOnlyReadRepair shouldn't be trying to repair partitions");
      }
  
      @Override
      public void awaitWrites()
      {
  
      }
  }
  