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.gms;
  
  import java.io.*;
  
  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;
  import org.apache.cassandra.locator.InetAddressAndPort;
  
  import static org.apache.cassandra.locator.InetAddressAndPort.Serializer.inetAddressAndPortSerializer;
  
  /**
   * Contains information about a specified list of Endpoints and the largest version
   * of the state they have generated as known by the local endpoint.
   */
  public class GossipDigest implements Comparable<GossipDigest>
  {
      public static final IVersionedSerializer<GossipDigest> serializer = new GossipDigestSerializer();
  
      final InetAddressAndPort endpoint;
      final int generation;
      final int maxVersion;
  
      GossipDigest(InetAddressAndPort ep, int gen, int version)
      {
          endpoint = ep;
          generation = gen;
          maxVersion = version;
      }
  
      InetAddressAndPort getEndpoint()
      {
          return endpoint;
      }
  
      int getGeneration()
      {
          return generation;
      }
  
      int getMaxVersion()
      {
          return maxVersion;
      }
  
      public int compareTo(GossipDigest gDigest)
      {
          if (generation != gDigest.generation)
              return (generation - gDigest.generation);
          return (maxVersion - gDigest.maxVersion);
      }
  
      public String toString()
      {
          StringBuilder sb = new StringBuilder();
          sb.append(endpoint);
          sb.append(":");
          sb.append(generation);
          sb.append(":");
          sb.append(maxVersion);
          return sb.toString();
      }
  }
  
  class GossipDigestSerializer implements IVersionedSerializer<GossipDigest>
  {
      public void serialize(GossipDigest gDigest, DataOutputPlus out, int version) throws IOException
      {
          inetAddressAndPortSerializer.serialize(gDigest.endpoint, out, version);
          out.writeInt(gDigest.generation);
          out.writeInt(gDigest.maxVersion);
      }
  
      public GossipDigest deserialize(DataInputPlus in, int version) throws IOException
      {
          InetAddressAndPort endpoint = inetAddressAndPortSerializer.deserialize(in, version);
          int generation = in.readInt();
          int maxVersion = in.readInt();
          return new GossipDigest(endpoint, generation, maxVersion);
      }
  
      public long serializedSize(GossipDigest gDigest, int version)
      {
          long size = inetAddressAndPortSerializer.serializedSize(gDigest.endpoint, version);
          size += TypeSizes.sizeof(gDigest.generation);
          size += TypeSizes.sizeof(gDigest.maxVersion);
          return size;
      }
  }
  