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   /*
    * Copyright 2018 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.testsuite.transport.socket;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.buffer.ByteBuf;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelDuplexHandler;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.ChannelInboundHandlerAdapter;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.WriteBufferWaterMark;
  import io.netty.util.ReferenceCountUtil;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.TestInfo;
  import org.junit.jupiter.api.Timeout;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  
  public class SocketConditionalWritabilityTest extends AbstractSocketTest {
      @Test
      @Timeout(value = 30000, unit = TimeUnit.MILLISECONDS)
      public void testConditionalWritability(TestInfo testInfo) throws Throwable {
          run(testInfo, new Runner<ServerBootstrap, Bootstrap>() {
              @Override
              public void run(ServerBootstrap serverBootstrap, Bootstrap bootstrap) throws Throwable {
                  testConditionalWritability(serverBootstrap, bootstrap);
              }
          });
      }
  
      public void testConditionalWritability(ServerBootstrap sb, Bootstrap cb) throws Throwable {
          Channel serverChannel = null;
          Channel clientChannel = null;
          try {
              final int expectedBytes = 100 * 1024 * 1024;
              final int maxWriteChunkSize = 16 * 1024;
              final CountDownLatch latch = new CountDownLatch(1);
              sb.childOption(ChannelOption.WRITE_BUFFER_WATER_MARK, new WriteBufferWaterMark(8 * 1024, 16 * 1024));
              sb.childHandler(new ChannelInitializer<Channel>() {
                  @Override
                  protected void initChannel(Channel ch) {
                      ch.pipeline().addLast(new ChannelDuplexHandler() {
                          private int bytesWritten;
  
                          @Override
                          public void channelRead(ChannelHandlerContext ctx, Object msg) {
                              ReferenceCountUtil.release(msg);
                              writeRemainingBytes(ctx);
                          }
  
                          @Override
                          public void flush(ChannelHandlerContext ctx) {
                              if (ctx.channel().isWritable()) {
                                  writeRemainingBytes(ctx);
                              } else {
                                  ctx.flush();
                              }
                          }
  
                          @Override
                          public void channelWritabilityChanged(ChannelHandlerContext ctx) {
                              if (ctx.channel().isWritable()) {
                                  writeRemainingBytes(ctx);
                              }
                              ctx.fireChannelWritabilityChanged();
                          }
  
                          private void writeRemainingBytes(ChannelHandlerContext ctx) {
                              while (ctx.channel().isWritable() && bytesWritten < expectedBytes) {
                                  int chunkSize = Math.min(expectedBytes - bytesWritten, maxWriteChunkSize);
                                  bytesWritten += chunkSize;
                                  ctx.write(ctx.alloc().buffer(chunkSize).writeZero(chunkSize));
                              }
                              ctx.flush();
                          }
                      });
                  }
              });
  
              serverChannel = sb.bind().syncUninterruptibly().channel();
  
              cb.handler(new ChannelInitializer<Channel>() {
                 @Override
                 protected void initChannel(Channel ch) {
                     ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {
                         private int totalRead;
                         @Override
                         public void channelActive(ChannelHandlerContext ctx) {
                             ctx.writeAndFlush(ctx.alloc().buffer(1).writeByte(0));
                         }
 
                         @Override
                         public void channelRead(ChannelHandlerContext ctx, Object msg) {
                             if (msg instanceof ByteBuf) {
                                 totalRead += ((ByteBuf) msg).readableBytes();
                                 if (totalRead == expectedBytes) {
                                     latch.countDown();
                                 }
                             }
                             ReferenceCountUtil.release(msg);
                         }
                     });
                 }
             });
             clientChannel = cb.connect(serverChannel.localAddress()).syncUninterruptibly().channel();
             latch.await();
         } finally {
             if (serverChannel != null) {
                 serverChannel.close();
             }
             if (clientChannel != null) {
                 clientChannel.close();
             }
         }
     }
 }