From 6923d3accd1a9c4a235e1dc1fa73281c0227d35a Mon Sep 17 00:00:00 2001 From: Seun Matt Date: Sat, 20 Jan 2018 18:18:01 +0100 Subject: [PATCH] Example Code for Exceptions in Netty (#3406) * added updated example codes * updated example code StringToCharStream * deleted StringToCharStream.java locally * removed redundant file * added code for apache commons collection SetUtils * refactored example code * added example code for bytebuddy * added example code for PCollections * update pom * refactored tests for PCollections * spring security xml config * spring security xml config * remove redundant comment * example code for apache-shiro * updated example code for Vavr Collections * updated Vavr's Collection example * updated Vavr Collection file * updated example code for Apache Shiro * updated Vavr Collections example * added example code for N1QL * update example code for N1QL * added integration test for N1QL * update N1QL Example code * update the N1QL example Code * rename module to couchbase * rename module to couchbase * change module name in parent module and pom * added cas-server module * added cas secured app for Spring SSO with CAS * refactor cas modules into cas folder * updated files * removed redundant files * refactor the config for cas-server * added sql file to generate tables and database * added source code for VRaptor * update source code for VRaptor article * update pom and reformat code * add example code for BAEL-1439 * updated code for netty exceptions --- .../com/baeldung/netty/ChannelHandlerA.java | 22 +++++++++ .../com/baeldung/netty/ChannelHandlerB.java | 20 ++++++++ .../java/com/baeldung/netty/NettyServerB.java | 47 +++++++++++++++++++ 3 files changed, 89 insertions(+) create mode 100644 libraries/src/main/java/com/baeldung/netty/ChannelHandlerA.java create mode 100644 libraries/src/main/java/com/baeldung/netty/ChannelHandlerB.java create mode 100644 libraries/src/main/java/com/baeldung/netty/NettyServerB.java diff --git a/libraries/src/main/java/com/baeldung/netty/ChannelHandlerA.java b/libraries/src/main/java/com/baeldung/netty/ChannelHandlerA.java new file mode 100644 index 0000000000..c919bdb09c --- /dev/null +++ b/libraries/src/main/java/com/baeldung/netty/ChannelHandlerA.java @@ -0,0 +1,22 @@ +package com.baeldung.netty; + +import io.netty.channel.ChannelHandlerContext; +import io.netty.channel.ChannelInboundHandlerAdapter; + +import java.util.logging.Logger; + +public class ChannelHandlerA extends ChannelInboundHandlerAdapter { + + private Logger logger = Logger.getLogger(getClass().getName()); + + @Override + public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { + throw new Exception("Ooops"); + } + + @Override + public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { + logger.info("Exception Occurred in ChannelHandler A"); + ctx.fireExceptionCaught(cause); + } +} diff --git a/libraries/src/main/java/com/baeldung/netty/ChannelHandlerB.java b/libraries/src/main/java/com/baeldung/netty/ChannelHandlerB.java new file mode 100644 index 0000000000..c5bdeb1013 --- /dev/null +++ b/libraries/src/main/java/com/baeldung/netty/ChannelHandlerB.java @@ -0,0 +1,20 @@ +package com.baeldung.netty; + +import io.netty.channel.ChannelHandlerContext; +import io.netty.channel.ChannelInboundHandlerAdapter; + +import java.util.logging.Logger; + + +public class ChannelHandlerB extends ChannelInboundHandlerAdapter { + + private Logger logger = Logger.getLogger(getClass().getName()); + + @Override + public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { + logger.info("Exception Handled in ChannelHandler B"); + logger.info(cause.getLocalizedMessage()); + //do more exception handling + ctx.close(); + } +} diff --git a/libraries/src/main/java/com/baeldung/netty/NettyServerB.java b/libraries/src/main/java/com/baeldung/netty/NettyServerB.java new file mode 100644 index 0000000000..c8004623c2 --- /dev/null +++ b/libraries/src/main/java/com/baeldung/netty/NettyServerB.java @@ -0,0 +1,47 @@ +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 NettyServerB { + + private int port; + + private NettyServerB(int port) { + this.port = port; + } + + private 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() { + public void initChannel(SocketChannel ch) throws Exception { + ch.pipeline().addLast(new ChannelHandlerA(), new ChannelHandlerB()); + } + }) + .option(ChannelOption.SO_BACKLOG, 128) + .childOption(ChannelOption.SO_KEEPALIVE, true); + ChannelFuture f = b.bind(port).sync(); // (7) + f.channel().closeFuture().sync(); + } finally { + workerGroup.shutdownGracefully(); + bossGroup.shutdownGracefully(); + } + } + + public static void main(String[] args) throws Exception { + new NettyServerB(8080).run(); + } +}