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   /*
    * Copyright 2016 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.channel.Channel;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInboundHandlerAdapter;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.testsuite.transport.TestsuitePermutation;
  import io.netty.util.NetUtil;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.api.TestInfo;
  import org.junit.jupiter.api.Timeout;
  
  import java.nio.channels.AlreadyConnectedException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.concurrent.TimeUnit;
  
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class SocketMultipleConnectTest extends AbstractSocketTest {
  
      @Test
      @Timeout(value = 30000, unit = TimeUnit.MILLISECONDS)
      public void testMultipleConnect(TestInfo testInfo) throws Throwable {
          run(testInfo, new Runner<ServerBootstrap, Bootstrap>() {
              @Override
              public void run(ServerBootstrap serverBootstrap, Bootstrap bootstrap) throws Throwable {
                  testMultipleConnect(serverBootstrap, bootstrap);
              }
          });
      }
  
      public void testMultipleConnect(ServerBootstrap sb, Bootstrap cb) throws Exception {
          Channel sc = null;
          Channel cc = null;
          try {
              sb.childHandler(new ChannelInboundHandlerAdapter());
              sc = sb.bind(NetUtil.LOCALHOST, 0).syncUninterruptibly().channel();
  
              cb.handler(new ChannelInboundHandlerAdapter());
              cc = cb.register().syncUninterruptibly().channel();
              cc.connect(sc.localAddress()).syncUninterruptibly();
              ChannelFuture connectFuture2 = cc.connect(sc.localAddress()).await();
              assertTrue(connectFuture2.cause() instanceof AlreadyConnectedException);
          } finally {
              if (cc != null) {
                  cc.close();
              }
              if (sc != null) {
                  sc.close();
              }
          }
      }
  
      @Override
      protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
          List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> factories
                  = new ArrayList<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>>();
          for (TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap> comboFactory
                  : SocketTestPermutation.INSTANCE.socketWithFastOpen()) {
              if (comboFactory.newClientInstance().config().group() instanceof NioEventLoopGroup) {
                  factories.add(comboFactory);
              }
          }
          return factories;
      }
  }