quora system design

Essence of system design • The essence of system design is to find the abstract behind the application • The requirements and use cases do not express or mention these abstractions. They are too detailed to express the general nature of the underlying Abstraction How to abstract • Abstraction needs to be carried o

System of various authority design (1) Video Commentary watch online: Video commentary link http://i.youku.com/jfok1972 The system now has the ability to design a common four types of permissions. 1, the operation of the module permissions: Include can browse, add

Permission design (2) Ii. Visual permissions of module records. In general, what records can you see and what records can't be viewed? It's easy to say and not easy to do. Let's start with a simple requirement. If one internal engineer processes all the contracts in the sales system built above, there is no permission to design the

Article Description: This article only combs the design principle, the subsequent related content will continue to update. Notifications here include, but are not limited to, announcements, reminders, or messages (different function definitions under different usage scenarios). About the client platform (iOS, Android, WP, etc.) notification mechanism, in its interactive design guide has more detailed descri

Java Bookstore System Project functional Requirements: 1, can carry out the operation of the user registration, modify basic information, delete and query.2. The basic information of the book can be added, deleted, modified and query operation.3, can fill in the purchase list, a purchase order with a number of specific purchase information, purchase books must be books management inside already have;4, can fill out a sales list, a sales list with a n

2012 System Architect Exam in the afternoon, there is a 25-point design pattern, the morning is still 5 multiple-choice questions, can be said to be from the 2009 test design mode of the largest number of the year. Sunny friendship Suggestion: suggest you do these questions first, see whether can correct answer, if in the solution at the same time can come up wit

and knowledge (I have never thought too well about the classification standards, so I said my own experience and knowledge), I divided data into two categories: landing data and not landing data. Landing data: persistent data, which is usually stored on a hard disk or another persistent storage device. For example: images, system logs, data displayed on the page, and data stored in the relational database, there must be a fixed carrier for la

system already exists, the design of this simple writing can be really simple. There are two similar practices in "loosely coupled programming. One is that the master tells his thoughts to the apprentice (generally using a whiteboard or blank paper), and the apprentice asks the teacher to answer questions, almost until now. On the contrary, the apprentice told the master about the question and guidance of

Scrum 3.3 Multi-fish ordering system Development Progress (Order Details page design)1. Team Name: Crime Squad2. Team goal: Long-term management, accumulate customers fully prepared, waiting for the line3. Team slogan: unswervingly, the pursuit of perfection 4. Team selection: Restaurant to shop ordering system Web5.Sprint 3 time: 12.09-12.18Serious Case Group me

This design document was written in March to attend the company's R D summit. I was confident, but I was not shortlisted. Now I think it is useless, so I will post it and look forward to communicating with park friends. The document is a little long and is not all posted on the blog. If you are interested, you can download the PDF file in the attachment. Attachment: " -- System

20145221 high its 20145326 Cai "the foundation of Information security system Design" experimental two firmware design experiment purpose and requirements Learn the basic principles of multi-threaded programming and learn the use of Pthread library functions. Understand the basic methods of serial programming in Linux environment. Master the main

? Within a certain period of time when a purchase is completed? Can you make changes to comments?2.3 Not logged in processingAmazon, Zol's failure case3, the content of the comments3.1 Rating3.1.1 The form of scoring> Interaction: Pull down? Radio? JS Star touch control?> System design: 3 points? 5 points? 10 points?Elements of 3.1.2 Scoring3.2 CommentsThe form of 3.2.1 comments> Do I need a title?> Is ther

Design and Development of webgame Chapter 3 smart path searching system design based on navigation grid 3.0 3.1 opencv-Based Map Analysis and contour extraction 3.2 gridded area in a plane 3.3 A * path Finding Based on 2-way heapAlgorithm 3.4 funnel algorithm-based path Smoothing 3.5 Data Structure Design rel

Beijing Institute of Electronic Technology (BESTI)Real Inspection report Course: Information Security system Design Basic experiment class: 1353School Number name: 20135305 Liao 20135310 Chen ChaojanScore: Instructor: Lou Jia Peng Experimental Date: 2015.11.17Experiment level: Preview degree: Experiment time: 15:30-18:30Instrument Group: Compulsory/Elective: compulsory test number: fiveExperiment Name:

Packageinterview_10_10;Importorg.junit.Test; Public classT1 {/*** If the system is going to use a very large integer (over a long length range), you should design a data structure to store this very large number and design an algorithm for large integer addition operations. */@Test Public voidtest1 () {String number1= "4324328732789"; String number2= "23832443243

Http://piglili.blogbus.com/logs/45219030.html background: In a seminar on the collection of tag functions, the tagging of the meaning of the crowd was hotly discussed. In order to structure the idea, close-up of this article is discussed separately: 1. is tag useful? ; 2. The advantages and disadvantages of the tagging; 3.tagging system and its UI design. more boring, is a knowledge point of the

Beijing Institute of Electronic Technology (BESTI)Real inspection report Course: Information Security system Design Basic class: 1352 Name: LussonStudy number: 20135229 20135234 score: Instructor: Lou Jia Peng Experimental Date:: 2015.11.10Experiment level: Preview degree: Experiment time: 15:30-17:30Instrument Group: Compulsory/Elective: compulsory test number: 02First, the contents of the experime

while executing the./term/dev/ttys0:no such file or directory can be resolved by using a method to establish a connection.In Linux under the serial port file is located in/dev, generally in the old version of the kernel serial port one for/DEV/TTYS0, serial port Two for/DEV/TTYS1, in our Development Board serial device is located in/dev/tts/, because there is no ttyS0 this device in the Development Board, we have to establish a connection.First, enter the/dev folder in HyperTerminal.Enter the c

The input signal of the access control system includes: Landing Lever position sensor: Two position value signal (up/down) Car entry sensor: Two values (True/false) Car Gate sensor: Two values (True/false) The output signal of the access control system includes: Motor control signal for landing lever: (Up/down) Traffic light signal: (Red/green) The passing process of

data at once and adding properties.previous lesson: MySQL Subversion practical Note (v)--Commodity system Design (II): Regular update of total product hitsCopyright Notice: NOTE-taker fugitive pawns love freedom, advocating sharing. But this note stems from the www.jtthink.com (programmer in the awkward way) Judging teacher's "web-level MySQL subversive combat course." For reprint please respect the teache