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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
This commit is contained in:
Anton 2017-06-07 08:52:23 +03:00 committed by Grzegorz Piwowarek
parent 4c88eebd55
commit 4732baccab
12 changed files with 291 additions and 0 deletions
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6
libraries/pom.xml
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@ -308,6 +308,11 @@
<artifactId>jool</artifactId>
<version>0.9.12</version>
</dependency>
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-all</artifactId>
<version>${netty.version}</version>
</dependency>
</dependencies>
<properties>
<multiverse.version>0.7.0</multiverse.version>
@ -332,6 +337,7 @@
<serenity.jira.version>1.1.3-rc.5</serenity.jira.version>
<serenity.plugin.version>1.4.0</serenity.plugin.version>
<jUnitParams.version>1.1.0</jUnitParams.version>
<netty.version>4.1.10.Final</netty.version>
</properties>
</project>

20
libraries/src/main/java/com/baeldung/netty/ClientHandler.java Normal file
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@ -0,0 +1,20 @@
package com.baeldung.netty;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
public class ClientHandler extends ChannelInboundHandlerAdapter {
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
RequestData msg = new RequestData();
msg.setIntValue(123);
msg.setStringValue("all work and no play makes jack a dull boy");
ctx.writeAndFlush(msg);
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
System.out.println(msg);
ctx.close();
}
}

37
libraries/src/main/java/com/baeldung/netty/NettyClient.java Normal file
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@ -0,0 +1,37 @@
package com.baeldung.netty;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
public class NettyClient {
public static void main(String[] args) throws Exception {
String host = "localhost";
int port = 8080;
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
Bootstrap b = new Bootstrap();
b.group(workerGroup);
b.channel(NioSocketChannel.class);
b.option(ChannelOption.SO_KEEPALIVE, true);
b.handler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(new RequestDataEncoder(), new ResponseDataDecoder(), new ClientHandler());
}
});
ChannelFuture f = b.connect(host, port).sync();
f.channel().closeFuture().sync();
} finally {
workerGroup.shutdownGracefully();
}
}
}

49
libraries/src/main/java/com/baeldung/netty/NettyServer.java Normal file
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@ -0,0 +1,49 @@
package com.baeldung.netty;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
public class NettyServer {
private int port;
public NettyServer(int port) {
this.port = port;
}
public static void main(String[] args) throws Exception {
int port;
if (args.length > 0) {
port = Integer.parseInt(args[0]);
} else {
port = 8080;
}
new NettyServer(port).run();
}
public void run() throws Exception {
EventLoopGroup bossGroup = new NioEventLoopGroup();
EventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap b = new ServerBootstrap();
b.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(SocketChannel ch) throws Exception {
ch.pipeline().addLast(new RequestDecoder(), new ResponseDataEncoder(), new ProcessingHandler());
}
}).option(ChannelOption.SO_BACKLOG, 128).childOption(ChannelOption.SO_KEEPALIVE, true);
ChannelFuture f = b.bind(port).sync();
f.channel().closeFuture().sync();
} finally {
workerGroup.shutdownGracefully();
bossGroup.shutdownGracefully();
}
}
}

19
libraries/src/main/java/com/baeldung/netty/ProcessingHandler.java Normal file
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@ -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);
}
}

30
libraries/src/main/java/com/baeldung/netty/RequestData.java Normal file
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@ -0,0 +1,30 @@
package com.baeldung.netty;
public class RequestData {
private int intValue;
private String stringValue;
public int getIntValue() {
return intValue;
}
public void setIntValue(int intValue) {
this.intValue = intValue;
}
public String getStringValue() {
return stringValue;
}
public void setStringValue(String stringValue) {
this.stringValue = stringValue;
}
@Override
public String toString() {
return "RequestData{" +
"intValue=" + intValue +
", stringValue='" + stringValue + '\'' +
'}';
}
}

19
libraries/src/main/java/com/baeldung/netty/RequestDataEncoder.java Normal file
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@ -0,0 +1,19 @@
package com.baeldung.netty;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import java.nio.charset.Charset;
public class RequestDataEncoder extends MessageToByteEncoder<RequestData> {
private final Charset charset = Charset.forName("UTF-8");
@Override
protected void encode(ChannelHandlerContext ctx, RequestData msg, ByteBuf out) throws Exception {
out.writeInt(msg.getIntValue());
out.writeInt(msg.getStringValue().length());
out.writeCharSequence(msg.getStringValue(), charset);
}
}

22
libraries/src/main/java/com/baeldung/netty/RequestDecoder.java Normal file
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@ -0,0 +1,22 @@
package com.baeldung.netty;
import java.nio.charset.Charset;
import java.util.List;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;
public class RequestDecoder extends ReplayingDecoder<RequestData> {
private final Charset charset = Charset.forName("UTF-8");
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
RequestData data = new RequestData();
data.setIntValue(in.readInt());
int strLen = in.readInt();
data.setStringValue(in.readCharSequence(strLen, charset).toString());
out.add(data);
}
}

20
libraries/src/main/java/com/baeldung/netty/ResponseData.java Normal file
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@ -0,0 +1,20 @@
package com.baeldung.netty;
public class ResponseData {
private int intValue;
public int getIntValue() {
return intValue;
}
public void setIntValue(int intValue) {
this.intValue = intValue;
}
@Override
public String toString() {
return "ResponseData{" +
"intValue=" + intValue +
'}';
}
}

17
libraries/src/main/java/com/baeldung/netty/ResponseDataDecoder.java Normal file
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@ -0,0 +1,17 @@
package com.baeldung.netty;
import java.util.List;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;
public class ResponseDataDecoder extends ReplayingDecoder<ResponseData> {
@Override
protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
ResponseData data = new ResponseData();
data.setIntValue(in.readInt());
out.add(data);
}
}

13
libraries/src/main/java/com/baeldung/netty/ResponseDataEncoder.java Normal file
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@ -0,0 +1,13 @@
package com.baeldung.netty;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
public class ResponseDataEncoder extends MessageToByteEncoder<ResponseData> {
@Override
protected void encode(ChannelHandlerContext ctx, ResponseData msg, ByteBuf out) throws Exception {
out.writeInt(msg.getIntValue());
}
}

39
libraries/src/main/java/com/baeldung/netty/SimpleProcessingHandler.java Normal file
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@ -0,0 +1,39 @@
package com.baeldung.netty;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
public class SimpleProcessingHandler extends ChannelInboundHandlerAdapter {
private ByteBuf tmp;
@Override
public void handlerAdded(ChannelHandlerContext ctx) {
System.out.println("Handler added");
tmp = ctx.alloc().buffer(4);
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) {
System.out.println("Handler removed");
tmp.release();
tmp = null;
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) {
ByteBuf m = (ByteBuf) msg;
tmp.writeBytes(m);
m.release();
if (tmp.readableBytes() >= 4) {
RequestData requestData = new RequestData();
requestData.setIntValue(tmp.readInt());
ResponseData responseData = new ResponseData();
responseData.setIntValue(requestData.getIntValue() * 2);
ChannelFuture future = ctx.writeAndFlush(responseData);
future.addListener(ChannelFutureListener.CLOSE);
}
}
}