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.messages;
  
  import java.io.IOException;
  
  import com.google.common.annotations.VisibleForTesting;
  
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.schema.TableId;
  import org.apache.cassandra.streaming.OutgoingStream;
  import org.apache.cassandra.streaming.StreamSession;
  import org.apache.cassandra.streaming.StreamingDataOutputPlus;
  import org.apache.cassandra.utils.FBUtilities;
  
  public class OutgoingStreamMessage extends StreamMessage
  {
      public static Serializer<OutgoingStreamMessage> serializer = new Serializer<OutgoingStreamMessage>()
      {
          public OutgoingStreamMessage deserialize(DataInputPlus in, int version)
          {
              throw new UnsupportedOperationException("Not allowed to call deserialize on an outgoing stream");
          }
  
          public void serialize(OutgoingStreamMessage message, StreamingDataOutputPlus out, int version, StreamSession session) throws IOException
          {
              message.startTransfer();
              try
              {
                  message.serialize(out, version, session);
                  session.streamSent(message);
              }
              finally
              {
                  message.finishTransfer();
              }
          }
  
          public long serializedSize(OutgoingStreamMessage message, int version)
          {
              return 0;
          }
      };
  
      public final StreamMessageHeader header;
      public final OutgoingStream stream;
      private boolean completed = false;
      private boolean transferring = false;
  
      public OutgoingStreamMessage(TableId tableId, StreamSession session, OutgoingStream stream, int sequenceNumber)
      {
          super(Type.STREAM);
  
          this.stream = stream;
          this.header = new StreamMessageHeader(tableId,
                                                FBUtilities.getBroadcastAddressAndPort(),
                                                session.planId(),
                                                session.isFollower(),
                                                session.sessionIndex(),
                                                sequenceNumber,
                                                stream.getRepairedAt(),
                                                stream.getPendingRepair());
      }
  
      public synchronized void serialize(StreamingDataOutputPlus out, int version, StreamSession session) throws IOException
      {
          if (completed)
          {
              return;
          }
          StreamMessageHeader.serializer.serialize(header, out, version);
          stream.write(session, out, version);
      }
  
      @VisibleForTesting
      public synchronized void finishTransfer()
      {
          transferring = false;
          //session was aborted mid-transfer, now it's safe to release
          if (completed)
          {
              stream.finish();
          }
      }
  
      @VisibleForTesting
      public synchronized void startTransfer()
      {
          if (completed)
              throw new RuntimeException(String.format("Transfer of stream %s already completed or aborted (perhaps session failed?).",
                                                       stream));
          transferring = true;
      }
  
      public synchronized void complete()
      {
          if (!completed)
          {
              completed = true;
              //release only if not transferring
              if (!transferring)
              {
                  stream.finish();
              }
          }
      }
  
      @Override
      public String toString()
      {
          return "OutgoingStreamMessage{" +
                 "header=" + header +
                 ", stream=" + stream +
                 '}';
      }
  
      public String getName()
      {
          return stream.getName();
      }
  }
  
  