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   * 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.
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  package org.apache.cassandra.streaming.async;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  
  import org.junit.After;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.embedded.EmbeddedChannel;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.io.util.DataInputBuffer;
  import org.apache.cassandra.io.util.DataInputPlus;
  import org.apache.cassandra.io.util.DataOutputBuffer;
  import org.apache.cassandra.io.util.DataOutputPlus;
  import org.apache.cassandra.net.MessagingService;
  import org.apache.cassandra.net.TestChannel;
  import org.apache.cassandra.schema.TableId;
  import org.apache.cassandra.streaming.PreviewKind;
  import org.apache.cassandra.streaming.StreamDeserializingTask;
  import org.apache.cassandra.streaming.StreamManager;
  import org.apache.cassandra.streaming.StreamOperation;
  import org.apache.cassandra.streaming.StreamResultFuture;
  import org.apache.cassandra.streaming.StreamSession;
  import org.apache.cassandra.streaming.StreamingChannel;
  import org.apache.cassandra.streaming.messages.CompleteMessage;
  import org.apache.cassandra.streaming.messages.IncomingStreamMessage;
  import org.apache.cassandra.streaming.messages.StreamInitMessage;
  import org.apache.cassandra.streaming.messages.StreamMessageHeader;
  import org.apache.cassandra.utils.TimeUUID;
  
  import static org.apache.cassandra.net.TestChannel.REMOTE_ADDR;
  import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUID;
  
  public class StreamingInboundHandlerTest
  {
      private NettyStreamingChannel streamingChannel;
      private EmbeddedChannel channel;
      private ByteBuf buf;
  
      @BeforeClass
      public static void before()
      {
          DatabaseDescriptor.daemonInitialization();
      }
  
      @Before
      public void setup()
      {
          channel = new TestChannel();
          streamingChannel = new NettyStreamingChannel(channel, StreamingChannel.Kind.CONTROL);
          channel.pipeline().addLast("stream", streamingChannel);
      }
  
      @After
      public void tearDown()
      {
          if (buf != null)
          {
              while (buf.refCnt() > 0)
                  buf.release();
          }
  
          channel.close();
      }
  
      @Test
      public void channelRead_WrongObject()
      {
          channel.writeInbound("homer");
          Assert.assertEquals(0, streamingChannel.in.unsafeAvailable());
          Assert.assertFalse(channel.releaseInbound());
      }
  
      @Test
      public void StreamDeserializingTask_deriveSession_StreamInitMessage()
      {
          StreamInitMessage msg = new StreamInitMessage(REMOTE_ADDR, 0, nextTimeUUID(), StreamOperation.REPAIR, nextTimeUUID(), PreviewKind.ALL);
          StreamDeserializingTask task = new StreamDeserializingTask(null, streamingChannel, MessagingService.current_version);
          StreamSession session = task.deriveSession(msg);
          Assert.assertNotNull(session);
      }
  
      @Test (expected = UnsupportedOperationException.class)
      public void StreamDeserializingTask_deriveSession_NoSession()
      {
          CompleteMessage msg = new CompleteMessage();
          StreamDeserializingTask task = new StreamDeserializingTask(null, streamingChannel, MessagingService.current_version);
          task.deriveSession(msg);
      }
  
      @Test (expected = IllegalStateException.class)
      public void StreamDeserializingTask_deserialize_ISM_NoSession() throws IOException
      {
          StreamMessageHeader header = new StreamMessageHeader(TableId.generate(), REMOTE_ADDR, nextTimeUUID(), true,
                                                               0, 0, 0, nextTimeUUID());
  
          ByteBuffer temp = ByteBuffer.allocate(1024);
          DataOutputPlus out = new DataOutputBuffer(temp);
          StreamMessageHeader.serializer.serialize(header, out, MessagingService.current_version);
  
          temp.flip();
          DataInputPlus in = new DataInputBuffer(temp, false);
          // session not found
          IncomingStreamMessage.serializer.deserialize(in, MessagingService.current_version);
      }
  
      @Test
      public void StreamDeserializingTask_deserialize_ISM_HasSession()
      {
          TimeUUID planId = nextTimeUUID();
          StreamResultFuture future = StreamResultFuture.createFollower(0, planId, StreamOperation.REPAIR, REMOTE_ADDR, streamingChannel, MessagingService.current_version, nextTimeUUID(), PreviewKind.ALL);
          StreamManager.instance.registerFollower(future);
          StreamMessageHeader header = new StreamMessageHeader(TableId.generate(), REMOTE_ADDR, planId, false,
                                                               0, 0, 0, nextTimeUUID());
  
          // IncomingStreamMessage.serializer.deserialize
          StreamSession session = StreamManager.instance.findSession(header.sender, header.planId, header.sessionIndex, header.sendByFollower);
          Assert.assertNotNull(session);
  
          session = StreamManager.instance.findSession(header.sender, header.planId, header.sessionIndex, !header.sendByFollower);
          Assert.assertNull(session);
      }
  }
  