Fix new Sonar smells

Author: artembilan

spring-integration-ip/src/main/java/org/springframework/integration/ip/tcp/connection/DefaultTcpNetConnectionSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2019 the original author or authors.
+ * Copyright 2017-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,19 +22,24 @@
 import java.net.Socket;
 
 import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.lang.Nullable;
 
 
 /**
  * Default implementation of {@link TcpNetConnectionSupport}.
+ *
  * @author Gary Russell
+ * @author Artem Bilan
+ *
  * @since 5.0
  *
  */
 public class DefaultTcpNetConnectionSupport extends AbstractTcpConnectionSupport implements TcpNetConnectionSupport {
 
 	@Override
 	public TcpNetConnection createNewConnection(Socket socket, boolean server, boolean lookupHost,
-			ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName) {
+			@Nullable ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName) {
+
 		if (isPushbackCapable()) {
 			return new PushBackTcpNetConnection(socket, server, lookupHost, applicationEventPublisher,
 					connectionFactoryName, getPushbackBufferSize());
@@ -55,7 +60,9 @@ private static final class PushBackTcpNetConnection extends TcpNetConnection {
 		private volatile InputStream wrapped;
 
 		PushBackTcpNetConnection(Socket socket, boolean server, boolean lookupHost,
-				ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName, int bufferSize) {
+				@Nullable ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName,
+				int bufferSize) {
+
 			super(socket, server, lookupHost, applicationEventPublisher, connectionFactoryName);
 			this.pushbackBufferSize = bufferSize;
 			this.connectionId = "pushback:" + super.getConnectionId();

spring-integration-ip/src/main/java/org/springframework/integration/ip/tcp/connection/DefaultTcpNioConnectionSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -38,7 +38,8 @@ public class DefaultTcpNioConnectionSupport extends AbstractTcpConnectionSupport
 
 	@Override
 	public TcpNioConnection createNewConnection(SocketChannel socketChannel, boolean server, boolean lookupHost,
-			ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName) {
+			@Nullable ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName) {
+
 		if (isPushbackCapable()) {
 			return new PushBackTcpNioConnection(socketChannel, server, lookupHost, applicationEventPublisher,
 					connectionFactoryName, getPushbackBufferSize());
@@ -60,7 +61,7 @@ private static final class PushBackTcpNioConnection extends TcpNioConnection {
 		private volatile InputStream wrapped;
 
 		PushBackTcpNioConnection(SocketChannel socketChannel, boolean server, boolean lookupHost,
-				ApplicationEventPublisher applicationEventPublisher, @Nullable String connectionFactoryName,
+				@Nullable ApplicationEventPublisher applicationEventPublisher, @Nullable String connectionFactoryName,
 				int bufferSize) {
 
 			super(socketChannel, server, lookupHost, applicationEventPublisher, connectionFactoryName);

spring-integration-ip/src/main/java/org/springframework/integration/ip/tcp/connection/DefaultTcpNioSSLConnectionSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -27,6 +27,7 @@
 import javax.net.ssl.SSLParameters;
 
 import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
 /**
@@ -75,7 +76,7 @@ public DefaultTcpNioSSLConnectionSupport(TcpSSLContextSupport sslContextSupport,
 	 */
 	@Override
 	public TcpNioConnection createNewConnection(SocketChannel socketChannel, boolean server, boolean lookupHost,
-			ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName) {
+			@Nullable ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName) {
 
 		SSLEngine sslEngine = this.sslContext.createSSLEngine();
 		postProcessSSLEngine(sslEngine);
@@ -119,7 +120,8 @@ private static final class PushBackTcpNioSSLConnection extends TcpNioSSLConnecti
 		private volatile InputStream wrapped;
 
 		PushBackTcpNioSSLConnection(SocketChannel socketChannel, boolean server, boolean lookupHost,
-				ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName, SSLEngine sslEngine,
+				@Nullable ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName,
+				SSLEngine sslEngine,
 				int bufferSize) {
 
 			super(socketChannel, server, lookupHost, applicationEventPublisher, connectionFactoryName, sslEngine);

spring-integration-ip/src/main/java/org/springframework/integration/ip/tcp/connection/TcpConnectionSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2001-2019 the original author or authors.
+ * Copyright 2001-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -115,7 +115,7 @@ public TcpConnectionSupport(@Nullable ApplicationEventPublisher applicationEvent
 	 * during event publishing, may be null, in which case "unknown" will be used.
 	 */
 	public TcpConnectionSupport(Socket socket, boolean server, boolean lookupHost,
-			ApplicationEventPublisher applicationEventPublisher,
+			@Nullable ApplicationEventPublisher applicationEventPublisher,
 			@Nullable String connectionFactoryName) {
 
 		this.socketInfo = new SocketInfo(socket);
@@ -359,21 +359,15 @@ protected final void sendExceptionToListener(Exception e) {
 	}
 
 	protected void publishConnectionOpenEvent() {
-		TcpConnectionEvent event = new TcpConnectionOpenEvent(this,
-				getConnectionFactoryName());
-		doPublish(event);
+		doPublish(new TcpConnectionOpenEvent(this, getConnectionFactoryName()));
 	}
 
 	protected void publishConnectionCloseEvent() {
-		TcpConnectionEvent event = new TcpConnectionCloseEvent(this,
-				getConnectionFactoryName());
-		doPublish(event);
+		doPublish(new TcpConnectionCloseEvent(this, getConnectionFactoryName()));
 	}
 
 	protected void publishConnectionExceptionEvent(Throwable t) {
-		TcpConnectionEvent event = new TcpConnectionExceptionEvent(this,
-				getConnectionFactoryName(), t);
-		doPublish(event);
+		doPublish(new TcpConnectionExceptionEvent(this, getConnectionFactoryName(), t));
 	}
 
 	/**

spring-integration-ip/src/main/java/org/springframework/integration/ip/tcp/connection/TcpNetConnection.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2001-2019 the original author or authors.
+ * Copyright 2001-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,6 +42,7 @@
  * A TcpConnection that uses and underlying {@link Socket}.
  *
  * @author Gary Russell
+ *
  * @since 2.0
  *
  */
@@ -68,7 +69,8 @@ public class TcpNetConnection extends TcpConnectionSupport implements Scheduling
 	 * during event publishing, may be null, in which case "unknown" will be used.
 	 */
 	public TcpNetConnection(Socket socket, boolean server, boolean lookupHost,
-			ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName) {
+			@Nullable ApplicationEventPublisher applicationEventPublisher, String connectionFactoryName) {
+
 		super(socket, server, lookupHost, applicationEventPublisher, connectionFactoryName);
 		this.socket = socket;
 	}

spring-integration-ip/src/main/java/org/springframework/integration/ip/tcp/connection/TcpNioConnection.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -53,6 +53,8 @@
  *
  * @author Gary Russell
  * @author John Anderson
+ * @author Artem Bilan
+ *
  * @since 2.0
  *
  */
@@ -106,7 +108,7 @@ public class TcpNioConnection extends TcpConnectionSupport {
 	 * @param connectionFactoryName The name of the connection factory creating this connection.
 	 */
 	public TcpNioConnection(SocketChannel socketChannel, boolean server, boolean lookupHost,
-			ApplicationEventPublisher applicationEventPublisher,
+			@Nullable ApplicationEventPublisher applicationEventPublisher,
 			@Nullable String connectionFactoryName) {
 
 		super(socketChannel.socket(), server, lookupHost, applicationEventPublisher, connectionFactoryName);
@@ -272,8 +274,7 @@ public void run() {
 				}
 				catch (Exception e) {
 					if (logger.isTraceEnabled()) {
-						logger.error("Read exception " +
-								getConnectionId(), e);
+						logger.error("Read exception " + getConnectionId(), e);
 					}
 					else if (!isNoReadErrorOnClose()) {
 						logger.error("Read exception " +
@@ -386,13 +387,11 @@ private synchronized Message<?> convert() throws IOException {
 
 	private void sendToChannel(Message<?> message) {
 		try {
-			if (message != null) {
-				TcpListener listener = getListener();
-				if (listener == null) {
-					throw new NoListenerException("No listener");
-				}
-				listener.onMessage(message);
+			TcpListener listener = getListener();
+			if (listener == null) {
+				throw new NoListenerException("No listener");
 			}
+			listener.onMessage(message);
 		}
 		catch (Exception e) {
 			if (e instanceof NoListenerException) { // could also be thrown by an interceptor
@@ -425,19 +424,19 @@ private void doRead() throws IOException {
 			checkForAssembler();
 
 			if (logger.isTraceEnabled()) {
-				logger.trace("Before read:" + this.rawBuffer.position() + "/" + this.rawBuffer.limit());
+				logger.trace("Before read: " + this.rawBuffer.position() + "/" + this.rawBuffer.limit());
 			}
 			int len = this.socketChannel.read(this.rawBuffer);
 			if (len < 0) {
 				this.writingToPipe = false;
 				closeConnection(true);
 			}
 			if (logger.isTraceEnabled()) {
-				logger.trace("After read:" + this.rawBuffer.position() + "/" + this.rawBuffer.limit());
+				logger.trace("After read: " + this.rawBuffer.position() + "/" + this.rawBuffer.limit());
 			}
 			this.rawBuffer.flip();
 			if (logger.isTraceEnabled()) {
-				logger.trace("After flip:" + this.rawBuffer.position() + "/" + this.rawBuffer.limit());
+				logger.trace("After flip: " + this.rawBuffer.position() + "/" + this.rawBuffer.limit());
 			}
 			if (logger.isDebugEnabled()) {
 				logger.debug("Read " + this.rawBuffer.limit() + " into raw buffer");
@@ -506,9 +505,7 @@ public void readPacket() {
 			closeConnection(true);
 		}
 		catch (Exception e) {
-			logger.error("Exception on Read " +
-					getConnectionId() + " " +
-					e.getMessage(), e);
+			logger.error("Exception on Read " + getConnectionId() + " " + e.getMessage(), e);
 			closeConnection(true);
 		}
 	}
@@ -535,8 +532,7 @@ public void setTaskExecutor(Executor taskExecutor) {
 	}
 
 	/**
-	 * If true, connection will attempt to use direct buffers where
-	 * possible.
+	 * If true, connection will attempt to use direct buffers where possible.
 	 * @param usingDirectBuffers the usingDirectBuffers to set.
 	 */
 	public void setUsingDirectBuffers(boolean usingDirectBuffers) {