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.paxos.v1;
  
  import java.util.concurrent.TimeUnit;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.exceptions.RequestFailureReason;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.net.IVerbHandler;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.net.MessagingService;
  import org.apache.cassandra.service.paxos.Commit;
  import org.apache.cassandra.service.StorageService;
  import org.apache.cassandra.utils.NoSpamLogger;
  
  public abstract class AbstractPaxosVerbHandler implements IVerbHandler<Commit>
  {
      private static final Logger logger = LoggerFactory.getLogger(AbstractPaxosVerbHandler.class);
      private static final String logMessageTemplate = "Received paxos request from {} for token {} outside valid range for keyspace {}";
  
      public void doVerb(Message<Commit> message)
      {
          Commit commit = message.payload;
          DecoratedKey key = commit.update.partitionKey();
          if (isOutOfRangeCommit(commit.update.metadata().keyspace, key))
          {
              StorageService.instance.incOutOfRangeOperationCount();
              Keyspace.open(commit.update.metadata().keyspace).metric.outOfRangeTokenPaxosRequests.inc();
  
              // Log at most 1 message per second
                  NoSpamLogger.log(logger, NoSpamLogger.Level.WARN, 1, TimeUnit.SECONDS, logMessageTemplate, message.from(), key.getToken(), commit.update.metadata().keyspace);
  
              sendFailureResponse(message);
          }
          else
          {
              processMessage(message);
          }
      }
  
      abstract void processMessage(Message<Commit> message);
  
      private static void sendFailureResponse(Message<?> respondTo)
      {
          Message reply = respondTo.failureResponse(RequestFailureReason.UNKNOWN);
          MessagingService.instance().send(reply, respondTo.from());
      }
  
      private static boolean isOutOfRangeCommit(String keyspace, DecoratedKey key)
      {
          return ! StorageService.instance.isEndpointValidForWrite(keyspace, key.getToken());
      }
  }
  