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.db;
  
  import org.apache.cassandra.exceptions.WriteTimeoutException;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.net.ForwardingInfo;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.net.MessagingService;
  import org.apache.cassandra.net.ParamType;
  import org.apache.cassandra.tracing.Tracing;
  
  import static java.util.concurrent.TimeUnit.NANOSECONDS;
  import static org.apache.cassandra.db.commitlog.CommitLogSegment.ENTRY_OVERHEAD_SIZE;
  import static org.apache.cassandra.utils.MonotonicClock.Global.approxTime;
  
  public class MutationVerbHandler extends AbstractMutationVerbHandler<Mutation>
  {
      public static final MutationVerbHandler instance = new MutationVerbHandler();
  
      private void respond(Message<?> respondTo, InetAddressAndPort respondToAddress)
      {
          Tracing.trace("Enqueuing response to {}", respondToAddress);
          MessagingService.instance().send(respondTo.emptyResponse(), respondToAddress);
      }
  
      private void failed()
      {
          Tracing.trace("Payload application resulted in WriteTimeout, not replying");
      }
  
      public void doVerb(Message<Mutation> message)
      {
          if (approxTime.now() > message.expiresAtNanos())
          {
              Tracing.trace("Discarding mutation from {} (timed out)", message.from());
              MessagingService.instance().metrics.recordDroppedMessage(message, message.elapsedSinceCreated(NANOSECONDS), NANOSECONDS);
              return;
          }
  
          message.payload.validateSize(MessagingService.current_version, ENTRY_OVERHEAD_SIZE);
  
          // Check if there were any forwarding headers in this message
          ForwardingInfo forwardTo = message.forwardTo();
          if (forwardTo != null)
              forwardToLocalNodes(message, forwardTo);
  
          InetAddressAndPort respondToAddress = message.respondTo();
          try
          {
              processMessage(message, respondToAddress);
          }
          catch (WriteTimeoutException wto)
          {
              failed();
          }
      }
  
      protected void applyMutation(Message<Mutation> message, InetAddressAndPort respondToAddress)
      {
          message.payload.applyFuture().addCallback(o -> respond(message, respondToAddress), wto -> failed());
      }
  
      private static void forwardToLocalNodes(Message<Mutation> originalMessage, ForwardingInfo forwardTo)
      {
          Message.Builder<Mutation> builder =
              Message.builder(originalMessage)
                     .withParam(ParamType.RESPOND_TO, originalMessage.from())
                     .withoutParam(ParamType.FORWARD_TO);
  
          // reuse the same Message if all ids are identical (as they will be for 4.0+ node originated messages)
          Message<Mutation> message = builder.build();
  
          forwardTo.forEach((id, target) ->
          {
              Tracing.trace("Enqueuing forwarded write to {}", target);
              MessagingService.instance().send(message, target);
          });
      }
  }
  