content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.grpc;
  
  import static org.junit.Assert.assertArrayEquals;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertNull;
  import static org.junit.Assert.assertTrue;
  
  import alluxio.network.protocol.databuffer.DataBuffer;
  import alluxio.network.protocol.databuffer.NettyDataBuffer;
  
  import com.google.protobuf.ByteString;
  import io.grpc.Drainable;
  import io.netty.buffer.Unpooled;
  import org.apache.commons.io.output.ByteArrayOutputStream;
  import org.junit.Test;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  /**
   * Unit tests for {@link ReadResponseMarshaller}.
   */
  public final class ReadResponseMarshallerTest {
  
    @Test
    public void streamEmptyMessage() throws Exception {
      validateStream(ReadResponse.getDefaultInstance());
    }
  
    @Test
    public void streamMessage() throws Exception {
      validateStream(buildResponse("test".getBytes()));
    }
  
    @Test
    public void parseEmptyMessage() throws Exception {
      validateParse(ReadResponse.getDefaultInstance());
    }
  
    @Test
    public void parseMessage() throws Exception {
      validateParse(buildResponse("test".getBytes()));
    }
  
    @Test
    public void close() {
      ReadResponseMarshaller marshaller = new ReadResponseMarshaller();
  
      ReadResponse msg1 = buildResponse("test1".getBytes());
      marshaller.offerBuffer(new NettyDataBuffer(
          Unpooled.wrappedBuffer(msg1.getChunk().getData().asReadOnlyByteBuffer())), msg1);
  
      DataBuffer data = marshaller.pollBuffer(msg1);
      assertNotNull(data);
      data.release();
  
      // close the marshaller
      marshaller.close();
  
      ReadResponse msg2 = buildResponse("test2".getBytes());
      marshaller.offerBuffer(new NettyDataBuffer(
          Unpooled.wrappedBuffer(msg2.getChunk().getData().asReadOnlyByteBuffer())), msg2);
  
      // No buffers should not exist, since the marshaller is already closed
      assertNull(marshaller.pollBuffer(msg1));
      assertNull(marshaller.pollBuffer(msg2));
    }
  
    private void validateStream(ReadResponse message) throws IOException {
      ReadResponseMarshaller marshaller = new ReadResponseMarshaller();
      byte[] expected = message.toByteArray();
      if (message.hasChunk() && message.getChunk().hasData()) {
        marshaller.offerBuffer(new NettyDataBuffer(
            Unpooled.wrappedBuffer(message.getChunk().getData().asReadOnlyByteBuffer())), message);
      }
      InputStream stream = marshaller.stream(message);
      assertTrue(stream instanceof Drainable);
      ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
      ((Drainable) stream).drainTo(outputStream);
      assertArrayEquals(expected, outputStream.toByteArray());
    }
  
    private void validateParse(ReadResponse message) {
      ReadResponseMarshaller marshaller = new ReadResponseMarshaller();
      byte[] data = message.toByteArray();
      ReadResponse parsedMessage = marshaller.parse(new ByteArrayInputStream(data));
      if (data.length > 0) {
        DataBuffer buffer = marshaller.pollBuffer(parsedMessage);
        assertNotNull(buffer);
        byte[] bytes = new byte[buffer.readableBytes()];
        buffer.readBytes(bytes, 0, bytes.length);
        parsedMessage = parsedMessage.toBuilder().setChunk(Chunk.newBuilder().setData(
          ByteString.copyFrom(bytes)
        ).build()).build();
      }
      assertEquals(message, parsedMessage);
    }
  
    private ReadResponse buildResponse(byte[] data) {
      return ReadResponse.newBuilder().setChunk(Chunk.newBuilder().setData(
          ByteString.copyFrom(data))).build();
    }
  }
  