Eric EricSeokgon

스프링부트 소개

발표영상

0. 스프링부트SpringBoot란?

Spring Boot makes it easy to create stand-alone, production-grade Spring based Applications that you can "just run". We take an opinionated view of the Spring platform and third-party libraries so you can get started with minimum fuss. Most Spring Boot applications need very little Spring configuration.

스프링부트는 단독실행되는, 실행하기만 하면 되는 상용화 가능한 수준의, 스프링 기반 애플리케이션을 쉽게 만들어낼 수 있다.
최소한의 설정으로 스프링 플랫폼과 서드파티 라이브러리들을 사용할 수 있도록 하고 있다.

How to migrate Django from SQLite to PostgreSQL

Dump existing data:

python3 manage.py dumpdata > datadump.json

Change settings.py to Postgres backend.

Make sure you can connect on PostgreSQL. Then:

Interview Questions: Analysis of Algorithms

3-SUM in quadratic time. Design an algorithm for the 3-SUM problem that takes time proportional to n2 in the worst case. You may assume that you can sort the n integers in time proportional to n2 or better.

Note: these interview questions are ungraded and purely for your own enrichment. To get a hint, submit a solution.

Hint: given an integer x and a sorted array a[] of n distinct integers, design a linear-time algorithm to determine if there exists two distinct indices i and j such that a[i]+a[j]==x.

Static HTML Page Generators

Hexo: https://hexo.io/
HubPress: https://github.com/HubPress/hubpress.io (Demo - https://www.youtube.com/watch?v=7gP3i4tHlRM)
Hugo: https://gohugo.io/
Jekyll: https://jekyllrb.com/
Lektor: https://www.getlektor.com/
Octopress: http://octopress.org/

	# DESCRIPTION: Perf test streams with a producer sending 1 million messages with
	# record sizes between 10, 100, 500, 1000, 2000, 5000, 10000 to 1 topic with 1
	# partition.
	maprcli stream delete -path /user/mapr/iantest
	maprcli stream create -path /user/mapr/iantest -produceperm p -consumeperm p -topicperm p -compression off
	THREADCOUNT=1
	TOPICS=1
	PARTITIONS=1
	MESSAGES=1000000
	# print csv header

	####################################################################################
	# DESCRIPTION: Kafka performance test. One producer sending 1 million messages with
	# record sizes between 10, 100, 500, 1000, 2000, 5000, 10000 to 1 topic with 1
	# partition.
	# PRECONDITIONS: Kafka and Zookeeper services must be running.
	####################################################################################

	THREADCOUNT=1
	TOPICS=1
	PARTITIONS=1

	import json
	import os
	import time
	import webbrowser
	import sys
	import re


	def handleWindows(extra_seconds):
	print("OS : Windows")

	import org.bouncycastle.util.encoders.Hex;
	import org.web3j.crypto.*;
	import java.math.BigInteger;

	public class ECCExample {

	public static String compressPubKey(BigInteger pubKey) {
	String pubKeyYPrefix = pubKey.testBit(0) ? "03" : "02";
	String pubKeyHex = pubKey.toString(16);
	String pubKeyX = pubKeyHex.substring(0, 64);

	// The following code is from http://www.academicpub.org/PaperInfo.aspx?PaperID=14496 .
	import java.math.BigInteger;
	import java.security.*;
	import java.security.spec.*;
	import javax.crypto.KeyAgreement;

	public class ECCKeyAgreement {
	public static void main(String[] args) throws Exception {
	KeyPairGenerator kpg;
	kpg = KeyPairGenerator.getInstance("EC","SunEC");

	#coding: utf-8

	"""
	Conway's Game of Life implementation with console interface
	Author: Antonio Ribeiro - alvesjunior.antonio@gmail.com
	license: Do What You Want to
	"""

	from time import sleep
	from random import randint