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   /*
    * Copyright 2014 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.buffer.Unpooled;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import java.util.concurrent.TimeUnit;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.TestInfo;
  import org.junit.jupiter.api.Timeout;
  
  import java.io.IOException;
  import java.util.concurrent.atomic.AtomicReference;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class SocketCancelWriteTest extends AbstractSocketTest {
  
      @Test
      @Timeout(value = 30000, unit = TimeUnit.MILLISECONDS)
      public void testCancelWrite(TestInfo testInfo) throws Throwable {
          run(testInfo, new Runner<ServerBootstrap, Bootstrap>() {
              @Override
              public void run(ServerBootstrap serverBootstrap, Bootstrap bootstrap) throws Throwable {
                  testCancelWrite(serverBootstrap, bootstrap);
              }
          });
      }
  
      public void testCancelWrite(ServerBootstrap sb, Bootstrap cb) throws Throwable {
          final TestHandler sh = new TestHandler();
          final TestHandler ch = new TestHandler();
          final ByteBuf a = Unpooled.buffer().writeByte('a');
          final ByteBuf b = Unpooled.buffer().writeByte('b');
          final ByteBuf c = Unpooled.buffer().writeByte('c');
          final ByteBuf d = Unpooled.buffer().writeByte('d');
          final ByteBuf e = Unpooled.buffer().writeByte('e');
  
          cb.handler(ch);
          sb.childHandler(sh);
  
          Channel sc = sb.bind().sync().channel();
          Channel cc = cb.connect(sc.localAddress()).sync().channel();
  
          ChannelFuture f = cc.write(a);
          assertTrue(f.cancel(false));
          cc.writeAndFlush(b);
          cc.write(c);
          ChannelFuture f2 = cc.write(d);
          assertTrue(f2.cancel(false));
          cc.writeAndFlush(e);
  
          while (sh.counter < 3) {
              if (sh.exception.get() != null) {
                  break;
              }
              if (ch.exception.get() != null) {
                  break;
              }
              Thread.sleep(50);
          }
          sh.channel.close().sync();
          ch.channel.close().sync();
          sc.close().sync();
  
          if (sh.exception.get() != null && !(sh.exception.get() instanceof IOException)) {
              throw sh.exception.get();
          }
          if (sh.exception.get() != null) {
              throw sh.exception.get();
          }
          if (ch.exception.get() != null && !(ch.exception.get() instanceof IOException)) {
              throw ch.exception.get();
          }
          if (ch.exception.get() != null) {
              throw ch.exception.get();
          }
          assertEquals(0, ch.counter);
          assertEquals(Unpooled.wrappedBuffer(new byte[]{'b', 'c', 'e'}), sh.received);
     }
 
     private static class TestHandler extends SimpleChannelInboundHandler<ByteBuf> {
         volatile Channel channel;
         final AtomicReference<Throwable> exception = new AtomicReference<Throwable>();
         volatile int counter;
         final ByteBuf received = Unpooled.buffer();
         @Override
         public void channelActive(ChannelHandlerContext ctx)
                 throws Exception {
             channel = ctx.channel();
         }
 
         @Override
         public void channelRead0(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
             counter += in.readableBytes();
             received.writeBytes(in);
         }
 
         @Override
         public void exceptionCaught(ChannelHandlerContext ctx,
                 Throwable cause) throws Exception {
             if (exception.compareAndSet(null, cause)) {
                 ctx.close();
             }
         }
     }
 }