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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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.util.concurrent.ExecutionException;
  import java.util.concurrent.Future;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.TimeoutException;
  
  import org.junit.After;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import io.netty.channel.ChannelPromise;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.net.TestChannel;
  import org.apache.cassandra.streaming.PreviewKind;
  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.utils.TimeUUID;
  
  import static org.apache.cassandra.net.MessagingService.current_version;
  import static org.apache.cassandra.net.TestChannel.REMOTE_ADDR;
  import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUID;
  
  public class StreamingMultiplexedChannelTest
  {
      private NettyStreamingChannel streamingChannel;
      private TestChannel channel;
      private StreamSession session;
      private StreamingMultiplexedChannel sender;
      private StreamingMultiplexedChannel.FileStreamTask fileStreamTask;
  
      @BeforeClass
      public static void before()
      {
          DatabaseDescriptor.daemonInitialization();
      }
  
      @Before
      public void setUp()
      {
          channel = new TestChannel();
          streamingChannel = new NettyStreamingChannel(channel, StreamingChannel.Kind.CONTROL);
          TimeUUID pendingRepair = nextTimeUUID();
          session = new StreamSession(StreamOperation.BOOTSTRAP, REMOTE_ADDR, new NettyStreamingConnectionFactory(), streamingChannel, current_version, true, 0, pendingRepair, PreviewKind.ALL);
          StreamResultFuture future = StreamResultFuture.createFollower(0, nextTimeUUID(), StreamOperation.REPAIR, REMOTE_ADDR, streamingChannel, current_version, pendingRepair, session.getPreviewKind());
          session.init(future);
          session.attachOutbound(streamingChannel);
  
          sender = session.getChannel();
          sender.setControlChannel(streamingChannel);
      }
  
      @After
      public void tearDown()
      {
          if (fileStreamTask != null)
              fileStreamTask.unsetChannel();
      }
  
      @Test
      public void FileStreamTask_acquirePermit_closed()
      {
          fileStreamTask = sender.new FileStreamTask(null);
          sender.setClosed();
          Assert.assertFalse(fileStreamTask.acquirePermit(1));
      }
  
      @Test
      public void FileStreamTask_acquirePermit_HapppyPath()
      {
          int permits = sender.semaphoreAvailablePermits();
          fileStreamTask = sender.new FileStreamTask(null);
          Assert.assertTrue(fileStreamTask.acquirePermit(1));
          Assert.assertEquals(permits - 1, sender.semaphoreAvailablePermits());
      }
  
      @Test
      public void FileStreamTask_BadChannelAttr()
      {
          int permits = sender.semaphoreAvailablePermits();
          channel.attr(NettyStreamingChannel.TRANSFERRING_FILE_ATTR).set(Boolean.TRUE);
          fileStreamTask = sender.new FileStreamTask(null);
          fileStreamTask.injectChannel(streamingChannel);
          fileStreamTask.run();
          Assert.assertEquals(StreamSession.State.FAILED, session.state());
          Assert.assertTrue(channel.releaseOutbound()); // when the session fails, it will send a SessionFailed msg
          Assert.assertEquals(permits, sender.semaphoreAvailablePermits());
      }
  
      @Test
      public void FileStreamTask_HappyPath()
      {
          int permits = sender.semaphoreAvailablePermits();
          fileStreamTask = sender.new FileStreamTask(new CompleteMessage());
          fileStreamTask.injectChannel(streamingChannel);
          fileStreamTask.run();
          Assert.assertNotEquals(StreamSession.State.FAILED, session.state());
          Assert.assertTrue(channel.releaseOutbound());
          Assert.assertEquals(permits, sender.semaphoreAvailablePermits());
      }
  
      @Test
      public void onControlMessageComplete_HappyPath()
      {
          Assert.assertTrue(channel.isOpen());
          Assert.assertTrue(sender.connected());
          ChannelPromise promise = channel.newPromise();
          promise.setSuccess();
          Assert.assertNull(sender.onMessageComplete(promise, new CompleteMessage()));
          Assert.assertTrue(channel.isOpen());
          Assert.assertTrue(sender.connected());
          Assert.assertNotEquals(StreamSession.State.FAILED, session.state());
      }
  
      @Test
      public void onControlMessageComplete_Exception() throws InterruptedException, ExecutionException, TimeoutException
      {
          Assert.assertTrue(channel.isOpen());
          Assert.assertTrue(sender.connected());
          ChannelPromise promise = channel.newPromise();
          promise.setFailure(new RuntimeException("this is just a testing exception"));
          Future f = sender.onMessageComplete(promise, new CompleteMessage());
  
          f.get(5, TimeUnit.SECONDS);
  
          Assert.assertFalse(channel.isOpen());
          Assert.assertFalse(sender.connected());
          Assert.assertEquals(StreamSession.State.FAILED, session.state());
      }
  }
  