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 accord.primitives.Txn;
  import org.apache.cassandra.db.ConsistencyLevel;
  import org.apache.cassandra.db.SinglePartitionReadCommand;
  import org.apache.cassandra.db.partitions.FilteredPartition;
  import org.apache.cassandra.db.partitions.PartitionUpdate;
  import org.apache.cassandra.exceptions.InvalidRequestException;
  import org.apache.cassandra.service.accord.txn.TxnResult;
  import org.apache.cassandra.service.paxos.Ballot;
  import org.apache.cassandra.tcm.ClusterMetadata;
  import org.apache.cassandra.transport.Dispatcher;
  
  import static org.apache.cassandra.service.StorageProxy.ConsensusAttemptResult;
  
  /**
   * Abstract the conditions and updates for a CAS operation.
   */
  public interface CASRequest
  {
      Dispatcher.RequestTime requestTime();
  
      /**
       * The command to use to fetch the value to compare for the CAS.
       */
      SinglePartitionReadCommand readCommand(long nowInSec);
  
      /**
       * Returns whether the provided CF, that represents the values fetched using the
       * readFilter(), match the CAS conditions this object stands for.
       */
      boolean appliesTo(FilteredPartition current) throws InvalidRequestException;
  
      /**
       * The updates to perform of a CAS success. The values fetched using the readFilter()
       * are passed as argument.
       */
      PartitionUpdate makeUpdates(FilteredPartition current, ClientState clientState, Ballot ballot) throws InvalidRequestException;
  
      Txn toAccordTxn(ClusterMetadata cm, ConsistencyLevel consistencyLevel, ConsistencyLevel commitConsistencyLevel, ClientState clientState, long nowInSecs);
  
      ConsensusAttemptResult toCasResult(TxnResult txnResult);
  }
  