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.common.memory.MemoryPool;
  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 static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNotNull;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class KafkaChannelTest {
  
      @Test
      public void testSending() throws IOException {
          Authenticator authenticator = Mockito.mock(Authenticator.class);
          TransportLayer transport = Mockito.mock(TransportLayer.class);
          MemoryPool pool = Mockito.mock(MemoryPool.class);
          ChannelMetadataRegistry metadataRegistry = Mockito.mock(ChannelMetadataRegistry.class);
  
          KafkaChannel channel = new KafkaChannel("0", transport, () -> authenticator,
              1024, pool, metadataRegistry);
          ByteBufferSend send = ByteBufferSend.sizePrefixed(ByteBuffer.wrap(TestUtils.randomBytes(128)));
          NetworkSend networkSend = new NetworkSend("0", send);
  
          channel.setSend(networkSend);
          assertTrue(channel.hasSend());
          assertThrows(IllegalStateException.class, () -> channel.setSend(networkSend));
  
          Mockito.when(transport.write(Mockito.any(ByteBuffer[].class))).thenReturn(4L);
          assertEquals(4L, channel.write());
          assertEquals(128, send.remaining());
          assertNull(channel.maybeCompleteSend());
  
          Mockito.when(transport.write(Mockito.any(ByteBuffer[].class))).thenReturn(64L);
          assertEquals(64, channel.write());
          assertEquals(64, send.remaining());
          assertNull(channel.maybeCompleteSend());
  
          Mockito.when(transport.write(Mockito.any(ByteBuffer[].class))).thenReturn(64L);
          assertEquals(64, channel.write());
          assertEquals(0, send.remaining());
          assertEquals(networkSend, channel.maybeCompleteSend());
      }
  
      @Test
      public void testReceiving() throws IOException {
          Authenticator authenticator = Mockito.mock(Authenticator.class);
          TransportLayer transport = Mockito.mock(TransportLayer.class);
          MemoryPool pool = Mockito.mock(MemoryPool.class);
          ChannelMetadataRegistry metadataRegistry = Mockito.mock(ChannelMetadataRegistry.class);
  
          ArgumentCaptor<Integer> sizeCaptor = ArgumentCaptor.forClass(Integer.class);
          Mockito.when(pool.tryAllocate(sizeCaptor.capture())).thenAnswer(invocation ->
              ByteBuffer.allocate(sizeCaptor.getValue())
          );
  
          KafkaChannel channel = new KafkaChannel("0", transport, () -> authenticator,
              1024, pool, metadataRegistry);
  
          ArgumentCaptor<ByteBuffer> bufferCaptor = ArgumentCaptor.forClass(ByteBuffer.class);
          Mockito.when(transport.read(bufferCaptor.capture())).thenAnswer(invocation -> {
              bufferCaptor.getValue().putInt(128);
              return 4;
          }).thenReturn(0);
          assertEquals(4, channel.read());
          assertEquals(4, channel.currentReceive().bytesRead());
          assertNull(channel.maybeCompleteReceive());
  
          Mockito.reset(transport);
          Mockito.when(transport.read(bufferCaptor.capture())).thenAnswer(invocation -> {
              bufferCaptor.getValue().put(TestUtils.randomBytes(64));
              return 64;
          });
          assertEquals(64, channel.read());
          assertEquals(68, channel.currentReceive().bytesRead());
          assertNull(channel.maybeCompleteReceive());
  
          Mockito.reset(transport);
          Mockito.when(transport.read(bufferCaptor.capture())).thenAnswer(invocation -> {
              bufferCaptor.getValue().put(TestUtils.randomBytes(64));
              return 64;
          });
          assertEquals(64, channel.read());
          assertEquals(132, channel.currentReceive().bytesRead());
          assertNotNull(channel.maybeCompleteReceive());
          assertNull(channel.currentReceive());
      }
  
  }
  