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.kafka.common.requests;
  
  import org.apache.kafka.common.utils.Utils;
  
  import org.junit.jupiter.api.Test;
  
  import java.nio.ByteBuffer;
  import java.util.Arrays;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class ByteBufferChannelTest {
  
      @Test
      public void testWriteBufferArrayWithNonZeroPosition() {
          byte[] data = Utils.utf8("hello");
          ByteBuffer buffer = ByteBuffer.allocate(32);
          buffer.position(10);
          buffer.put(data);
  
          int limit = buffer.position();
          buffer.position(10);
          buffer.limit(limit);
  
          ByteBufferChannel channel = new ByteBufferChannel(buffer.remaining());
          ByteBuffer[] buffers = new ByteBuffer[] {buffer};
          channel.write(buffers);
          channel.close();
          ByteBuffer channelBuffer = channel.buffer();
          assertEquals(data.length, channelBuffer.remaining());
          assertEquals("hello", Utils.utf8(channelBuffer));
      }
  
      @Test
      public void testWriteMultiplesByteBuffers() {
          ByteBuffer[] buffers = new ByteBuffer[] {
              ByteBuffer.wrap(Utils.utf8("hello")),
              ByteBuffer.wrap(Utils.utf8("world"))
          };
          int size = Arrays.stream(buffers).mapToInt(ByteBuffer::remaining).sum();
          ByteBuffer buf;
          try (ByteBufferChannel channel = new ByteBufferChannel(size)) {
              channel.write(buffers, 1, 1);
              buf = channel.buffer();
          }
          assertEquals("world", Utils.utf8(buf));
  
          try (ByteBufferChannel channel = new ByteBufferChannel(size)) {
              channel.write(buffers, 0, 1);
              buf = channel.buffer();
          }
          assertEquals("hello", Utils.utf8(buf));
  
          try (ByteBufferChannel channel = new ByteBufferChannel(size)) {
              channel.write(buffers, 0, 2);
              buf = channel.buffer();
          }
          assertEquals("helloworld", Utils.utf8(buf));
      }
  
      @Test
      public void testInvalidArgumentsInWritsMultiplesByteBuffers() {
          try (ByteBufferChannel channel = new ByteBufferChannel(10)) {
              assertThrows(IndexOutOfBoundsException.class, () -> channel.write(new ByteBuffer[0], 1, 1));
              assertThrows(IndexOutOfBoundsException.class, () -> channel.write(new ByteBuffer[0], -1, 1));
              assertThrows(IndexOutOfBoundsException.class, () -> channel.write(new ByteBuffer[0], 0, -1));
              assertThrows(IndexOutOfBoundsException.class, () -> channel.write(new ByteBuffer[0], 0, 1));
              assertEquals(0, channel.write(new ByteBuffer[0], 0, 0));
          }
      }
  }
  