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.record;
  
  import org.apache.kafka.common.network.ByteBufferSend;
  import org.apache.kafka.common.network.Send;
  import org.apache.kafka.test.TestUtils;
  
  import org.junit.jupiter.api.Test;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.LinkedList;
  import java.util.Queue;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class MultiRecordsSendTest {
  
      @Test
      public void testSendsFreedAfterWriting() throws IOException {
          int numChunks = 4;
          int chunkSize = 32;
          int totalSize = numChunks * chunkSize;
  
          Queue<Send> sends = new LinkedList<>();
          ByteBuffer[] chunks = new ByteBuffer[numChunks];
  
          for (int i = 0; i < numChunks; i++) {
              ByteBuffer buffer = ByteBuffer.wrap(TestUtils.randomBytes(chunkSize));
              chunks[i] = buffer;
              sends.add(new ByteBufferSend(buffer));
          }
  
          MultiRecordsSend send = new MultiRecordsSend(sends);
          assertEquals(totalSize, send.size());
  
          for (int i = 0; i < numChunks; i++) {
              assertEquals(numChunks - i, send.numResidentSends());
              NonOverflowingByteBufferChannel out = new NonOverflowingByteBufferChannel(chunkSize);
              send.writeTo(out);
              out.close();
              assertEquals(chunks[i], out.buffer());
          }
  
          assertEquals(0, send.numResidentSends());
          assertTrue(send.completed());
      }
  
      private static class NonOverflowingByteBufferChannel extends org.apache.kafka.common.requests.ByteBufferChannel {
  
          private NonOverflowingByteBufferChannel(long size) {
              super(size);
          }
  
          @Override
          public long write(ByteBuffer[] srcs) {
              // Instead of overflowing, this channel refuses additional writes once the buffer is full,
              // which allows us to test the MultiRecordsSend behavior on a per-send basis.
              if (!buffer().hasRemaining())
                  return 0;
              return super.write(srcs);
          }
      }
  
  }
  