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.network;
  
  import org.apache.kafka.test.TestUtils;
  
  import org.junit.jupiter.api.Test;
  import org.mockito.ArgumentCaptor;
  import org.mockito.Mockito;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.nio.channels.ScatteringByteChannel;
  import java.util.stream.IntStream;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class NetworkReceiveTest {
  
      @Test
      public void testBytesRead() throws IOException {
          NetworkReceive receive = new NetworkReceive(128, "0");
          assertEquals(0, receive.bytesRead());
  
          ScatteringByteChannel channel = Mockito.mock(ScatteringByteChannel.class);
  
          ArgumentCaptor<ByteBuffer> bufferCaptor = ArgumentCaptor.forClass(ByteBuffer.class);
          Mockito.when(channel.read(bufferCaptor.capture())).thenAnswer(invocation -> {
              bufferCaptor.getValue().putInt(128);
              return 4;
          }).thenReturn(0);
  
          assertEquals(4, receive.readFrom(channel));
          assertEquals(4, receive.bytesRead());
          assertFalse(receive.complete());
  
          Mockito.reset(channel);
          Mockito.when(channel.read(bufferCaptor.capture())).thenAnswer(invocation -> {
              bufferCaptor.getValue().put(TestUtils.randomBytes(64));
              return 64;
          });
  
          assertEquals(64, receive.readFrom(channel));
          assertEquals(68, receive.bytesRead());
          assertFalse(receive.complete());
  
          Mockito.reset(channel);
          Mockito.when(channel.read(bufferCaptor.capture())).thenAnswer(invocation -> {
              bufferCaptor.getValue().put(TestUtils.randomBytes(64));
              return 64;
          });
  
          assertEquals(64, receive.readFrom(channel));
          assertEquals(132, receive.bytesRead());
          assertTrue(receive.complete());
      }
  
      @Test
      public void testRequiredMemoryAmountKnownWhenNotSet() {
          NetworkReceive receive = new NetworkReceive("0");
          assertFalse(receive.requiredMemoryAmountKnown(), "Memory amount should not be known before read.");
      }
  
      @Test
      public void testRequiredMemoryAmountKnownWhenSet() throws IOException {
          NetworkReceive receive = new NetworkReceive(128, "0");
  
          ScatteringByteChannel channel = Mockito.mock(ScatteringByteChannel.class);
  
          ArgumentCaptor<ByteBuffer> bufferCaptor = ArgumentCaptor.forClass(ByteBuffer.class);
          Mockito.when(channel.read(bufferCaptor.capture())).thenAnswer(invocation -> {
              bufferCaptor.getValue().putInt(64);
              return 4;
          });
  
          receive.readFrom(channel);
          assertTrue(receive.requiredMemoryAmountKnown(), "Memory amount should be known after read.");
      }
  
      @Test
      public void testSizeWithPredefineBuffer() {
          int payloadSize = 8;
          int expectedTotalSize = 4 + payloadSize; // 4 bytes for size buffer + payload size
  
          ByteBuffer payloadBuffer = ByteBuffer.allocate(payloadSize);
          IntStream.range(0, payloadSize).forEach(i -> payloadBuffer.put((byte) i));
  
          NetworkReceive networkReceive = new NetworkReceive("0", payloadBuffer);
          assertEquals(expectedTotalSize, networkReceive.size(), "The total size should be the sum of the size buffer and payload.");
      }
  
      @Test
      public void testSizeAfterRead() throws IOException {
          int payloadSize = 32;
          int expectedTotalSize = 4 + payloadSize; // 4 bytes for size buffer + payload size
          NetworkReceive receive = new NetworkReceive(128, "0");
  
          ScatteringByteChannel channel = Mockito.mock(ScatteringByteChannel.class);
  
          ArgumentCaptor<ByteBuffer> bufferCaptor = ArgumentCaptor.forClass(ByteBuffer.class);
          Mockito.when(channel.read(bufferCaptor.capture())).thenAnswer(invocation -> {
              bufferCaptor.getValue().putInt(payloadSize);
              return 4;
          });
  
          receive.readFrom(channel);
          assertEquals(expectedTotalSize, receive.size(), "The total size should be the sum of the size buffer and receive size.");
      }
  }
  