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.dht;
  
  import java.util.Set;
  
  import com.google.common.annotations.VisibleForTesting;
  import com.google.common.collect.Streams;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import org.apache.cassandra.db.SystemKeyspace;
  import org.apache.cassandra.streaming.StreamEvent;
  import org.apache.cassandra.streaming.StreamEventHandler;
  import org.apache.cassandra.streaming.StreamRequest;
  import org.apache.cassandra.streaming.StreamState;
  
  /**
   * Store and update available ranges (data already received) to system keyspace.
   */
  public class StreamStateStore implements StreamEventHandler
  {
      private static final Logger logger = LoggerFactory.getLogger(StreamStateStore.class);
  
      public SystemKeyspace.AvailableRanges getAvailableRanges(String keyspace, IPartitioner partitioner)
      {
          return SystemKeyspace.getAvailableRanges(keyspace, partitioner);
      }
  
      /**
       * Check if given token's data is available in this node. This doesn't handle transientness in a useful way
       * so it's only used by a legacy test
       *
       * @param keyspace keyspace name
       * @param token token to check
       * @return true if given token in the keyspace is already streamed and ready to be served.
       */
      @VisibleForTesting
      public boolean isDataAvailable(String keyspace, Token token)
      {
          SystemKeyspace.AvailableRanges availableRanges = getAvailableRanges(keyspace, token.getPartitioner());
  
          return Streams.concat(availableRanges.full.stream(),
                                availableRanges.trans.stream())
                        .anyMatch(range -> range.contains(token));
      }
  
      /**
       * When StreamSession completes, make all keyspaces/ranges in session available to be served.
       *
       * @param event Stream event.
       */
      @Override
      public void handleStreamEvent(StreamEvent event)
      {
          if (event.eventType == StreamEvent.Type.STREAM_COMPLETE)
          {
              StreamEvent.SessionCompleteEvent se = (StreamEvent.SessionCompleteEvent) event;
              if (se.success)
              {
                  Set<String> keyspaces = se.transferredRangesPerKeyspace.keySet();
                  for (String keyspace : keyspaces)
                  {
                      SystemKeyspace.updateTransferredRanges(se.streamOperation, se.peer, keyspace, se.transferredRangesPerKeyspace.get(keyspace));
                  }
                  for (StreamRequest request : se.requests)
                  {
                      SystemKeyspace.updateAvailableRanges(request.keyspace, request.full.ranges(), request.transientReplicas.ranges());
                  }
              }
          }
      }
  
      @Override
      public void onSuccess(StreamState streamState) {}
  
      @Override
      public void onFailure(Throwable throwable) {}
  }
  