content: package org.apache.cassandra.service.paxos;
  /*
   *
   * 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.
   *
   */
  
  
  import java.io.IOException;
  
  import org.apache.cassandra.db.TypeSizes;
  import org.apache.cassandra.io.IVersionedSerializer;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputPlus;
  
  public class PrepareResponse
  {
      public static final PrepareResponseSerializer serializer = new PrepareResponseSerializer();
  
      public final boolean promised;
  
      /*
       * To maintain backward compatibility (see #6023), the meaning of inProgressCommit is a bit tricky.
       * If promised is true, then that's the last accepted commit. If promise is false, that's just
       * the previously promised ballot that made us refuse this one.
       */
      public final Commit inProgressCommit;
      public final Commit mostRecentCommit;
  
      public PrepareResponse(boolean promised, Commit inProgressCommit, Commit mostRecentCommit)
      {
          assert inProgressCommit.update.partitionKey().equals(mostRecentCommit.update.partitionKey());
          assert inProgressCommit.update.metadata().id.equals(mostRecentCommit.update.metadata().id);
  
          this.promised = promised;
          this.mostRecentCommit = mostRecentCommit;
          this.inProgressCommit = inProgressCommit;
      }
  
      @Override
      public String toString()
      {
          return String.format("PrepareResponse(%s, %s, %s)", promised, mostRecentCommit, inProgressCommit);
      }
  
      public static class PrepareResponseSerializer implements IVersionedSerializer<PrepareResponse>
      {
          public void serialize(PrepareResponse response, DataOutputPlus out, int version) throws IOException
          {
              out.writeBoolean(response.promised);
              Commit.serializer.serialize(response.inProgressCommit, out, version);
              Commit.serializer.serialize(response.mostRecentCommit, out, version);
          }
  
          public PrepareResponse deserialize(DataInputPlus in, int version) throws IOException
          {
              boolean success = in.readBoolean();
              Commit inProgress = Commit.serializer.deserialize(in, version);
              Commit mostRecent = Commit.serializer.deserialize(in, version);
              return new PrepareResponse(success, inProgress, mostRecent);
          }
  
          public long serializedSize(PrepareResponse response, int version)
          {
              return TypeSizes.sizeof(response.promised)
                   + Commit.serializer.serializedSize(response.inProgressCommit, version)
                   + Commit.serializer.serializedSize(response.mostRecentCommit, version);
          }
      }
  }
  