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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
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   *
   *     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
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  package org.apache.cassandra.db.streaming;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.WritableByteChannel;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Queue;
  
  import org.junit.BeforeClass;
  import org.junit.Test;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.Unpooled;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelOutboundHandlerAdapter;
  import io.netty.channel.ChannelPromise;
  import io.netty.channel.DefaultFileRegion;
  import io.netty.channel.embedded.EmbeddedChannel;
  import org.apache.cassandra.SchemaLoader;
  import org.apache.cassandra.Util;
  import org.apache.cassandra.db.ColumnFamilyStore;
  import org.apache.cassandra.db.Keyspace;
  import org.apache.cassandra.db.RowUpdateBuilder;
  import org.apache.cassandra.db.compaction.CompactionManager;
  import org.apache.cassandra.db.lifecycle.StreamingLifecycleTransaction;
  import org.apache.cassandra.io.sstable.Descriptor;
  import org.apache.cassandra.io.sstable.SSTableTxnSingleStreamWriter;
  import org.apache.cassandra.io.sstable.format.SSTableReader;
  import org.apache.cassandra.io.util.DataInputBuffer;
  import org.apache.cassandra.locator.InetAddressAndPort;
  import org.apache.cassandra.net.AsyncStreamingOutputPlus;
  import org.apache.cassandra.net.SharedDefaultFileRegion;
  import org.apache.cassandra.schema.CachingParams;
  import org.apache.cassandra.schema.KeyspaceParams;
  import org.apache.cassandra.streaming.PreviewKind;
  import org.apache.cassandra.streaming.SessionInfo;
  import org.apache.cassandra.streaming.StreamCoordinator;
  import org.apache.cassandra.streaming.StreamEventHandler;
  import org.apache.cassandra.streaming.StreamOperation;
  import org.apache.cassandra.streaming.StreamResultFuture;
  import org.apache.cassandra.streaming.StreamSession;
  import org.apache.cassandra.streaming.StreamSummary;
  import org.apache.cassandra.streaming.async.NettyStreamingConnectionFactory;
  import org.apache.cassandra.streaming.messages.StreamMessageHeader;
  import org.apache.cassandra.utils.ByteBufferUtil;
  import org.apache.cassandra.utils.FBUtilities;
  
  import static java.util.Collections.emptyList;
  import static org.apache.cassandra.utils.TimeUUID.Generator.nextTimeUUID;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  public class CassandraEntireSSTableStreamWriterTest
  {
      public static final String KEYSPACE = "CassandraEntireSSTableStreamWriterTest";
      public static final String CF_STANDARD = "Standard1";
      public static final String CF_INDEXED = "Indexed1";
      public static final String CF_STANDARDLOWINDEXINTERVAL = "StandardLowIndexInterval";
  
      private static SSTableReader sstable;
      private static Descriptor descriptor;
      private static ColumnFamilyStore store;
  
      @BeforeClass
      public static void defineSchemaAndPrepareSSTable()
      {
          SchemaLoader.prepareServer();
          SchemaLoader.createKeyspace(KEYSPACE,
                                      KeyspaceParams.simple(1),
                                      SchemaLoader.standardCFMD(KEYSPACE, CF_STANDARD),
                                      SchemaLoader.compositeIndexCFMD(KEYSPACE, CF_INDEXED, true),
                                      SchemaLoader.standardCFMD(KEYSPACE, CF_STANDARDLOWINDEXINTERVAL)
                                                  .minIndexInterval(8)
                                                  .maxIndexInterval(256)
                                                  .caching(CachingParams.CACHE_NOTHING));
  
          Keyspace keyspace = Keyspace.open(KEYSPACE);
          store = keyspace.getColumnFamilyStore("Standard1");
  
          // insert data and compact to a single sstable
          CompactionManager.instance.disableAutoCompaction();
          for (int j = 0; j < 10; j++)
          {
              new RowUpdateBuilder(store.metadata(), j, String.valueOf(j))
              .clustering("0")
              .add("val", ByteBufferUtil.EMPTY_BYTE_BUFFER)
              .build()
              .applyUnsafe();
          }
          Util.flush(store);
          CompactionManager.instance.performMaximal(store);
  
          sstable = store.getLiveSSTables().iterator().next();
          descriptor = sstable.descriptor;
      }
  
      @Test
      public void testBlockWriterOverWire() throws IOException
      {
          StreamSession session = setupStreamingSessionForTest();
  
          EmbeddedChannel channel = new EmbeddedChannel();
          try (AsyncStreamingOutputPlus out = new AsyncStreamingOutputPlus(channel);
               ComponentContext context = ComponentContext.create(sstable))
          {
              CassandraEntireSSTableStreamWriter writer = new CassandraEntireSSTableStreamWriter(sstable, session, context);
  
              writer.write(out);
  
              Queue msgs = channel.outboundMessages();
  
              assertTrue(msgs.peek() instanceof DefaultFileRegion);
          }
      }
  
      @Test
      public void testBlockReadingAndWritingOverWire() throws Throwable
      {
          StreamSession session = setupStreamingSessionForTest();
          InetAddressAndPort peer = FBUtilities.getBroadcastAddressAndPort();
  
  
          // This is needed as Netty releases the ByteBuffers as soon as the channel is flushed
          ByteBuf serializedFile = Unpooled.buffer(8192);
          EmbeddedChannel channel = createMockNettyChannel(serializedFile);
          try (AsyncStreamingOutputPlus out = new AsyncStreamingOutputPlus(channel);
               ComponentContext context = ComponentContext.create(sstable))
          {
              CassandraEntireSSTableStreamWriter writer = new CassandraEntireSSTableStreamWriter(sstable, session, context);
              writer.write(out);
  
              session.prepareReceiving(new StreamSummary(sstable.metadata().id, emptyList(), 1, 5104));
  
              CassandraStreamHeader header =
              CassandraStreamHeader.builder()
                                   .withSSTableVersion(sstable.descriptor.version)
                                   .withSSTableLevel(0)
                                   .withEstimatedKeys(sstable.estimatedKeys())
                                   .withSections(emptyList())
                                   .withSerializationHeader(sstable.header.toComponent())
                                   .withComponentManifest(context.manifest())
                                   .isEntireSSTable(true)
                                   .withFirstKey(sstable.getFirst())
                                   .withTableId(sstable.metadata().id)
                                   .build();
  
              CassandraEntireSSTableStreamReader reader = new CassandraEntireSSTableStreamReader(new StreamMessageHeader(sstable.metadata().id, peer, session.planId(), false, 0, 0, 0, null), header, session);
  
              SSTableTxnSingleStreamWriter sstableWriter = (SSTableTxnSingleStreamWriter) reader.read(new DataInputBuffer(serializedFile.nioBuffer(), false));
              StreamingLifecycleTransaction stt = new StreamingLifecycleTransaction();
              Collection<SSTableReader> newSstables = sstableWriter.transferOwnershipTo(stt);
              assertEquals(1, newSstables.size());
              stt.abort();
          }
      }
  
      private EmbeddedChannel createMockNettyChannel(ByteBuf serializedFile) throws Exception
      {
          WritableByteChannel wbc = new WritableByteChannel()
          {
              private boolean isOpen = true;
              public int write(ByteBuffer src) throws IOException
              {
                  int size = src.limit();
                  serializedFile.writeBytes(src);
                  return size;
              }
  
              public boolean isOpen()
              {
                  return isOpen;
              }
  
              public void close() throws IOException
              {
                  isOpen = false;
              }
          };
  
          return new EmbeddedChannel(new ChannelOutboundHandlerAdapter() {
                  @Override
                  public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception
                  {
                      ((SharedDefaultFileRegion) msg).transferTo(wbc, 0);
                      super.write(ctx, msg, promise);
                  }
              });
      }
  
      private StreamSession setupStreamingSessionForTest()
      {
          StreamCoordinator streamCoordinator = new StreamCoordinator(StreamOperation.BOOTSTRAP, 1, new NettyStreamingConnectionFactory(), false, false, null, PreviewKind.NONE);
          StreamResultFuture future = StreamResultFuture.createInitiator(nextTimeUUID(), StreamOperation.BOOTSTRAP, Collections.<StreamEventHandler>emptyList(), streamCoordinator);
  
          InetAddressAndPort peer = FBUtilities.getBroadcastAddressAndPort();
          streamCoordinator.addSessionInfo(new SessionInfo(peer, 0, peer, emptyList(), emptyList(), StreamSession.State.INITIALIZED, null));
  
          StreamSession session = streamCoordinator.getOrCreateOutboundSession(peer);
          session.init(future);
          return session;
      }
  }
  