virtualsafety’s gists

virtualsafety / elasticsearch.md

Created November 21, 2017 08:12 — forked from kkc/elasticsearch.md

Elasticsearch performance tuning

##TUNING##

System: set file descriptors to 32K or 64K

vim /etc/security/limit.conf

virtualsafety / java和scala混合编程.txt

Last active May 24, 2021 09:57

java和scala混合编程

	http://www.cnblogs.com/yjmyzz/p/4694219.html
	mvn clean scala:compile compile package

	http://blog.csdn.net/kwu_ganymede/article/details/51832427


	https://blogs.oracle.com/arungupta/entry/scala_and_maven_getting_started
	mvn scala:run

	http://running8.blog.51cto.com/2687882/1603429

virtualsafety / myip.go

Created July 26, 2017 03:30 — forked from jniltinho/myip.go

Get My IP Golang

	package main

	/*
	URL: https://github.com/mccoyst/myip/blob/master/myip.go
	URL: http://changsijay.com/2013/07/28/golang-get-ip-address/
	*/

	import (
	"net"
	"os"

virtualsafety / check.go

Created July 14, 2017 03:47 — forked from mattes/check.go

Check if file or directory exists in Golang

	if _, err := os.Stat("/path/to/whatever"); os.IsNotExist(err) {
	// path/to/whatever does not exist
	}

	if _, err := os.Stat("/path/to/whatever"); err == nil {
	// path/to/whatever exists
	}

virtualsafety / read_exec_output_line_by_line.go

Created July 1, 2017 14:37

read exec output line by line

virtualsafety / AlertActiveSessionTuple.scala

Created May 4, 2017 01:43

read json from kafka , parse json to case class , and then convert case class to tuple.

	package com.test.flink

	import java.util.Properties
	import org.apache.flink.streaming.api.scala._
	import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer09
	import org.apache.flink.streaming.util.serialization.SimpleStringSchema
	import org.apache.flink.streaming.api.windowing.time.Time
	import org.json4s._
	import org.json4s.jackson.JsonMethods._

virtualsafety / ScalaJson.scala

Last active July 8, 2021 06:27

利用json4s解析json数据

	import org.json4s._
	import org.json4s.jackson.JsonMethods._

	object ScalaJson {

	def main(args: Array[String]): Unit = {

	implicit val formats = DefaultFormats

	case class Model(hello: String, age: Int)

virtualsafety / reflect_1.scala

Created April 15, 2017 13:38

查看 Scala 语法树的方法

	import scala.reflect.runtime._
	import scala.tools.reflect.ToolBox
	val cm = universe.runtimeMirror(getClass.getClassLoader)
	val tb = cm.mkToolBox()
	tb.parse("for(i <- List(1,2,3) ) {println(i)}")

virtualsafety / shell_output.go

Created April 10, 2017 03:39 — forked from hivefans/shell_output.go

get the realtime output for a shell command in golang

virtualsafety / HelloQuasiquotes.scala

Last active April 9, 2017 12:56

下面的例子演示了如何利用Quasiquotes来实现Code Generation:

	import scala.reflect.runtime.currentMirror
	import scala.tools.reflect.ToolBox

	object HelloQuasiquotes {

	def main(args: Array[String]): Unit = {
	val universe: scala.reflect.runtime.universe.type = scala.reflect.runtime.universe
	import universe._

	val toolbox = currentMirror.mkToolBox()

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