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.streaming;
  
  import java.io.IOException;
  
  import javax.annotation.Nullable;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.gms.FailureDetector;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.locator.RangesAtEndpoint;
  import org.apache.cassandra.locator.Replica;
  import org.apache.cassandra.net.IVerbHandler;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.net.MessagingService;
  import org.apache.cassandra.net.NoPayload;
  import org.apache.cassandra.net.Verb;
  import org.apache.cassandra.schema.Schema;
  import org.apache.cassandra.tcm.ClusterMetadata;
  
  public class DataMovementVerbHandler implements IVerbHandler<DataMovement>
  {
      private static final Logger logger = LoggerFactory.getLogger(DataMovementVerbHandler.class);
      public static final DataMovementVerbHandler instance = new DataMovementVerbHandler();
  
      @Override
      public void doVerb(Message<DataMovement> message) throws IOException
      {
          MessagingService.instance().respond(NoPayload.noPayload, message); // let coordinator know we received the message
          StreamPlan streamPlan = new StreamPlan(StreamOperation.fromString(message.payload.streamOperation));
          ClusterMetadata metadata = ClusterMetadata.current();
          Schema.instance.getNonLocalStrategyKeyspaces().stream().forEach((ksm) -> {
              if (metadata.placements.get(ksm.params.replication).writes.byEndpoint().keySet().size() <= 1)
                  return;
  
              message.payload.movements.get(ksm.params.replication).asMap().forEach((local, endpoints) -> {
                  assert local.isSelf();
                  boolean transientAdded = false;
                  boolean fullAdded = false;
                  for (Replica remote : DatabaseDescriptor.getNodeProximity()
                                                          .sortedByProximity(local.endpoint(), endpoints)
                                                          .filter(ep -> FailureDetector.instance.isAlive(ep.endpoint())))
                  {
                      assert !remote.isSelf();
                      if (remote.isFull() && !fullAdded)
                      {
                          streamPlan.requestRanges(remote.endpoint(), ksm.name, RangesAtEndpoint.of(local), RangesAtEndpoint.empty(local.endpoint()));
                          fullAdded = true;
                      }
                      else if (remote.isTransient() && !transientAdded)
                      {
                          streamPlan.requestRanges(remote.endpoint(), ksm.name, RangesAtEndpoint.empty(local.endpoint()), RangesAtEndpoint.of(local));
                          transientAdded = true;
                      }
  
                      if (fullAdded && transientAdded)
                          break;
                  }
                  if (!fullAdded)
                  {
                      if (local.isFull() || !transientAdded)
                      {
                          logger.error("Found no sources to stream from for {}", local);
                          send(false, message.from(), message.payload.streamOperation, message.payload.operationId);
                      }
                  }
              });
          });
  
          streamPlan.execute().addEventListener(new StreamEventHandler()
          {
              @Override
              public void handleStreamEvent(StreamEvent event) {}
  
              @Override
              public void onSuccess(@Nullable StreamState streamState)
              {
                  send(true, message.from(), message.payload.streamOperation, message.payload.operationId);
              }
  
              @Override
              public void onFailure(Throwable throwable)
              {
                  send(false, message.from(), message.payload.streamOperation, message.payload.operationId);
              }
          });
  
      }
  
      private static void send(boolean success, InetAddressAndPort to, String operationType, String operationId)
      {
          MessagingService.instance().send(Message.out(Verb.DATA_MOVEMENT_EXECUTED_REQ,
                                                       new DataMovement.Status(success, operationType, operationId)),
                                           to);
      }
  }
  