Web Service Basic Architecture

헤더 정보
  • Request Method: 요청 메소드(GET, POST, PUT, DELETE 등)
  • Request URL: 요청 URL
  • Host: 요청한 서버의 도메인명 또는 IP 주소
  • User-Agent: 클라이언트의 브라우저 정보
  • Accept: 클라이언트가 받아들일 수 있는 MIME 타입
  • Content-Type: 요청 바디의 MIME 타입
  • Authorization: 인증 토큰 정보 등

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Interface of Java

 You can define(declare + initialize) variable like interface_name variable_name = new class_name() In such cases, the variable can only use method overriding the interfaces methods. Also, the language does not recognized it as the class; the language recognizes it as interface. Still, it does have member variables of the class and there are some libraries that enables the programmer to tell what class it is constructed(i.e. Reflection) Interface can be used as parameter of functions or return types of functions. When interface is a parameter, the class that implements the interface should be given to the function. When interface is a return type, it can be used for polymorphism. Also, variable of java(in case its not primitive type like int, float), it is rather closer to pointer of C++; it refers to the value, not contains value itself. The important point is that, when the class implements the interface, all of its public methods should be the interface's methods. If not, client...
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Data Analytics Overview(OLTP vs OLAP)

You’ve likely heard about the lucrative careers of high-level Data Analysts, but have you ever wondered how they actually handle "Big Data"? Of course, they aren’t just using Microsoft Excel. To understand the technology behind it, we must first distinguish between the two primary ways we process information:  OLTP  and  OLAP . 1. OLTP OLTP (Online Transactional Processing)  is the DB used for company’s daily operations. Whenever you post on Reddit or place an order on Amazon, you are interacting with an OLTP database. It is triggered by the business's customer and handled by the backend server so that it can provide the business. Fast:  It handles millions of requests with millisecond response times. Small&Frequent:  It focuses on small, frequent transactions—usually just a few rows at a time. Write-intensive:  Its primary job is to record or update new data as it happens. 2. OLAP OLAP (Online Analytical Processing)  is the very technology we...
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Leetcode

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1. Two Sum: find a pair with specific sum   class Solution : def twoSum ( self , nums : List [ int ] , target : int ) - > List [ int ] : numMap = { } n = len ( nums ) # Build the hash table for i in range ( n ) : numMap [ nums [ i ] ] = i # Find the complement for i in range ( n ) : complement = target - nums [ i ] if complement in numMap and numMap [ complement ] != i : return [ i , numMap [ complement ] ] return [ ] # No solution found You might wonder how does the code deals with duplicates. As you can see, in the iteration of building the hash table, always the latter(with bigger index) will be saved in the hash table. In the latter iteration finding the complement, the former one(with smaller index) always goes through the iteration earlier, so the [i, numMap[complement]] can return two different indexes, carrying duplicate...
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