Fix checkstyle errors

Motivation:

-to fix checkstyle error and missing licence

Modification:

-Added missing license and fixed checkstyle error

Result:

it's a non functional change

transport-native-io_uring/src/main/java/io/netty/channel/uring/AbstractIOUringChannel.java

@@ -212,7 +212,6 @@ abstract class AbstractIOUringChannel extends AbstractChannel implements UnixCha
         }
     }
 
-
     private void handleReadException(ChannelPipeline pipeline, ByteBuf byteBuf,
                                      Throwable cause, boolean close,
                                      IOUringRecvByteAllocatorHandle allocHandle) {

transport-native-io_uring/src/main/java/io/netty/channel/uring/AbstractIOUringServerChannel.java

@@ -15,7 +15,12 @@
  */
 package io.netty.channel.uring;
 
-import io.netty.channel.*;
+
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelOutboundBuffer;
+import io.netty.channel.ChannelPipeline;
+import io.netty.channel.ChannelPromise;
+import io.netty.channel.ServerChannel;
 
 import java.net.SocketAddress;
 
@@ -75,7 +80,6 @@ abstract class AbstractIOUringServerChannel extends AbstractIOUringChannel imple
             promise.setFailure(new UnsupportedOperationException());
         }
 
-
         @Override
         public void uringEventExecution() {
             final IOUringEventLoop ioUringEventLoop = (IOUringEventLoop) eventLoop();

transport-native-io_uring/src/main/java/io/netty/channel/uring/IOUringEventLoop.java

@@ -219,7 +219,8 @@ final class IOUringEventLoop extends SingleThreadEventLoop implements
             case IOUring.IO_POLL:
                 if (eventfd.intValue() == fd) {
                     pendingWakeup = false;
-                    // We need to consume the data as otherwise we would see another event in the completionQueue without
+                    // We need to consume the data as otherwise we would see another event
+                    // in the completionQueue without
                     // an extra eventfd_write(....)
                     Native.eventFdRead(eventfd.intValue());
                     submissionQueue.addPollLink(eventfd.intValue());

transport-native-io_uring/src/main/java/io/netty/channel/uring/IOUringSubmissionQueue.java

@@ -118,7 +118,7 @@ final class IOUringSubmissionQueue {
 
         // Store the fd and event type in the user_data field
         int opMask = (((short) op) << 16) | (((short) pollMask) & 0xFFFF);
-        long uData = (long)fd << 32 | opMask & 0xFFFFFFFFL;
+        long uData = (long) fd << 32 | opMask & 0xFFFFFFFFL;
 
         PlatformDependent.putLong(sqe + SQE_USER_DATA_FIELD, uData);
 
@@ -168,12 +168,10 @@ final class IOUringSubmissionQueue {
         return addPoll(fd, IOUring.POLLMASK_LINK);
     }
 
-
     public boolean addPollOut(int fd) {
         return addPoll(fd, IOUring.POLLMASK_OUT);
     }
 
-
     public boolean addPollRdHup(int fd) {
         return addPoll(fd, IOUring.POLLMASK_RDHUP);
     }
@@ -211,7 +209,7 @@ final class IOUringSubmissionQueue {
         if (sqe == 0) {
             return false;
         }
-        setData(sqe, (byte) IOUring.OP_ACCEPT, 0, fd, 0,0,0);
+        setData(sqe, (byte) IOUring.OP_ACCEPT, 0, fd, 0, 0, 0);
         return true;
     }
 

transport-native-io_uring/src/test/java/io/netty/channel/uring/IOUringEventLoopTest.java

@@ -28,26 +28,22 @@ public class IOUringEventLoopTest {
             loop.submit(new Runnable() {
                 @Override
                 public void run() {
-
                 }
             }).sync();
 
             loop.submit(new Runnable() {
                 @Override
                 public void run() {
-
                 }
             }).sync();
             loop.submit(new Runnable() {
                 @Override
                 public void run() {
-
                 }
             }).sync();
             loop.submit(new Runnable() {
                 @Override
                 public void run() {
-
                 }
             }).sync();
         } finally {

transport-native-io_uring/src/test/java/io/netty/channel/uring/IOUringSocketFixedLengthEchoTest.java

@@ -1,3 +1,18 @@
+/*
+ * Copyright 2020 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:
+ *
+ *   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 io.netty.channel.uring;
 
 import io.netty.bootstrap.Bootstrap;