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.tcm.sequences;
  
  import java.io.IOException;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ExecutionException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.net.IVerbHandler;
  import org.apache.cassandra.net.Message;
  import org.apache.cassandra.streaming.DataMovement;
  import org.apache.cassandra.streaming.StreamOperation;
  import org.apache.cassandra.tcm.ownership.MovementMap;
  import org.apache.cassandra.utils.concurrent.AsyncPromise;
  
  public class DataMovements implements IVerbHandler<DataMovement.Status>
  {
      private static final Logger logger = LoggerFactory.getLogger(DataMovements.class);
      public static final DataMovements instance = new DataMovements();
  
      private final Map<StreamOperation, Map<String, ResponseTracker>> inFlightMovements = new ConcurrentHashMap<>();
  
      public ResponseTracker registerMovements(StreamOperation type, String operationId, MovementMap movements)
      {
          Map<String, ResponseTracker> inFlightForType = inFlightMovements.computeIfAbsent(type, (type_) -> new ConcurrentHashMap<>());
          return inFlightForType.computeIfAbsent(operationId, (id) -> new ResponseTracker(movements));
      }
  
      public void unregisterMovements(StreamOperation type, String operationId)
      {
          Map<String, ResponseTracker> inFlightForType = inFlightMovements.get(type);
          if (inFlightForType != null)
              inFlightForType.remove(operationId);
      }
  
      @Override
      public void doVerb(Message<DataMovement.Status> message) throws IOException
      {
          Map<String, ResponseTracker> inFlightForType = inFlightMovements.get(StreamOperation.valueOf(message.payload.operationType));
          ResponseTracker responseTracker = inFlightForType.get(message.payload.operationId);
          if (responseTracker != null)
          {
              if (message.payload.success)
                  responseTracker.received(message.from());
              else
                  responseTracker.failure(message.from());
          }
          else
          {
              logger.error("Got DataMovement executed message for {}:{} from {}, but no tracker registered for that operation",
                           message.payload.operationType, message.payload.operationId, message.from());
              logger.debug("Current in-flight movements: {}", DataMovements.instance);
          }
      }
  
      @Override
      public String toString()
      {
          StringBuilder sb = new StringBuilder();
          inFlightMovements.forEach((type, byType) -> {
              sb.append(type).append('[');
              byType.forEach((id, tracker) -> {
                  sb.append(id).append(':');
                  tracker.remaining().forEach(i -> sb.append(i.toString(true)).append(','));
              });
              sb.append("],");
          });
          return sb.toString();
      }
  
      public static class ResponseTracker
      {
          private final Set<InetAddressAndPort> expected = ConcurrentHashMap.newKeySet();
          private final AsyncPromise<Object> promise = new AsyncPromise<>();
  
          public ResponseTracker(MovementMap movements)
          {
              movements.byEndpoint().forEach((endpoint, epMovements) -> expected.addAll(epMovements.byEndpoint().keySet()));
              if (expected.isEmpty())
                  promise.setSuccess(null);
          }
  
          public void received(InetAddressAndPort from)
          {
              logger.info("Received stream completion from {}", from);
              expected.remove(from);
              if (expected.isEmpty())
                  promise.setSuccess(null);
          }
  
          public void failure(InetAddressAndPort from)
          {
              logger.warn("Received stream failure from {}", from);
              if (expected.contains(from))
                  promise.setFailure(new RuntimeException());
          }
  
          public void await()
          {
              try
              {
                  promise.get();
              }
              catch (InterruptedException | ExecutionException e)
              {
                  throw new RuntimeException(e);
              }
          }
  
          public Set<InetAddressAndPort> remaining()
          {
              return new HashSet<>(expected);
          }
  
          public String toString()
          {
              return expected.toString();
          }
      }
  }
  