luoka luoka

Node 出现 uncaughtException 之后的优雅退出方案

Node 的异步特性是它最大的魅力，但是在带来便利的同时也带来了不少麻烦和坑，错误捕获就是一个。由于 Node 的异步特性，导致我们无法使用 try/catch 来捕获回调函数中的异常，例如:

try {
    fs.read('SOME_FILE_DOES_NOT_EXIST', function readCallback(err, content) {
        if (err) {
            throw err; // 抛出异常
 }

	public class AESUtil
	{
	private static final Logger LOGGER = LoggerFactory.getLogger(AESUtil.class);

	/**将二进制转换成16进制
	* @param buf
	* @return
	*/
	public static String parseByte2HexStr(byte buf[]) {
	StringBuffer sb = new StringBuffer();

	function Person(){
	this.name = "person name";
	}
	Person.prototype.showName = function(){
	console.log(this.name);
	}


	function Student(){
	this.name = "student name";

	//function is object
	//测试call方法，function.call(object, arguments...) ==> object.function(arguments...); 以object为上下文执行function方法
	function add(a, b){
	console.log(a + b);
	}

	function sub(a, b){
	console.log(a - b);
	}

	#!/usr/bin/perl
	use strict;

	chomp(my $filename=$ARGV[0]);
	chomp(my $username=$ARGV[1]);
	chomp(my $password=$ARGV[2]);

	if (!$filename \|\| !$username \|\| !$password) {
	print "USAGE: ./crypt.pl filename username password\n\n";
	} else {

	upstream some_app_server {
	server 127.0.0.1:9393;
	}

	server {
	listen 80;

	server_name my-upload-endpoint.com ;

	1.install Ruby and Rubygems
	download ruby and install
	run Start Command Prompt With Ruby
	2.update rubygems
	gem update --system
	3.install vmc
	gem install vmc
	4.targets the PaaS Cloud Foundry
	vmc target https://api.cloudfoundry.com
	5.to show current target

	introduction:http://en.wikipedia.org/wiki/Cron;

	#write out current crontab
	crontab -l > mycron
	#echo new cron into cron file
	echo "00 09 * * 1-5 echo hello" >> mycron
	#install new cron file
	crontab mycron
	rm mycron

	mvn clean
	mvn eclipse:clean
	mvn eclipse:eclipse
	mvn package
	mvn dependency:copy-dependencies -DoutputDirectory=/target/lib
	mvn tomcat:run
	mvn jetty:run
	mvn clean tomcat:run -Dlog4j.debug=true

	Run in bash:
	./redis-cli KEYS preffix* \| xargs ./redis-cli DEL