-import static com.google.common.base.Preconditions.checkNotNull;
-import static org.junit.Assert.fail;
-import static org.mockito.Matchers.any;
-import static org.mockito.Mockito.doNothing;
-import static org.mockito.Mockito.doReturn;
-import static org.mockito.Mockito.mock;
-
-import java.io.DataOutputStream;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.lang.management.ManagementFactory;
-import java.net.InetSocketAddress;
-import java.net.Socket;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import java.util.Set;
-
-import javax.management.ObjectName;
-
+import com.google.common.base.Optional;
+import com.google.common.collect.Sets;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.util.HashedWheelTimer;