BAEL-768 Introduction to Netty (#1933)

* BAEL-748 quick guide to @Value

* BAEL-748 changes from review

* BAEL-748 inject comma-separated values into array

* BAEL-768 Introduction to Netty

* BAEL-768 remove commented code

libraries/src/main/java/com/baeldung/netty/ProcessingHandler.java

@@ -0,0 +1,19 @@
+package com.baeldung.netty;
+
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+
+public class ProcessingHandler extends ChannelInboundHandlerAdapter {
+
+    @Override
+    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+        RequestData requestData = (RequestData) msg;
+        ResponseData responseData = new ResponseData();
+        responseData.setIntValue(requestData.getIntValue() * 2);
+        ChannelFuture future = ctx.writeAndFlush(responseData);
+        future.addListener(ChannelFutureListener.CLOSE);
+        System.out.println(requestData);
+    }
+}