quora system design

Why do I write this article As I get closer to Android development, I'm increasingly discovering that Android (at least the application that used to have it) uses a lot of callback thinking. For example, the life cycle of activity, fragment life cycle, is the callback function implementation, Android, the event processing mechanism is a callback, the thread of asynchronous tasks, loader, Hanlder, etc. are based on callback, and so on. One of the fundamental ideas of Android is the callback, wh

In the previous article "UML System Analysis and Design 02-use case diagram and activity diagram (I)", we mainly explained the use case analysis and drawing methods and techniques in requirement analysis, however, the use case diagram only tells us what the system wants to do. As for how to do it, there is no intuitive description. To better illustrate how our

First, preface1, the pair: 2015034643032 hole Tan Live, 2015034643023 Zhouhongje2. Demand Analysis Model: NABCD model3. Prototype Design tools: Axure RP 8, ink knife, fscaptureSecond, the pairing processIii. Demand Analysis 1, N (need, demand): As the frontier Group of Social new technology and New thought, it is very important for college students to forge their own distinctive application-oriented talents during the university, and this mob

. The function of the controller RFD in the network is usually the end node, cannot communicate with each other directly, can only communicate with the FFD or the coordinator. In addition to the RFD function, FFD is generally used as a network routing node. The network coordinator is actually one of the FFD, but has more computing power and system resources, it acts as the coordinator in the network Formation, is responsible for establishing the netwo

because before always fooled, suddenly feel like this is still a waste of time, it is better to learn something. In the course of learning, I found it was actually quite interesting. gave a certain degree of confidence. The previous command, turn the book, in the virtual machine find, Baidu find, feel on some, should still need to do more questions.Their own lack ofThe Foundation is too poorBecause before oneself with oneself stroppy and drop a lot of things, learning is very difficult, or the

I read the fourth chapter of this book is a requirement specification, which illustrates the importance of architecture in system development and shows all aspects of UML. The Pcbmer architecture is also described in the book. Pcbmer represents-controller-bean-Mediator-entity-resource Architecture framework. has been observed in UML modeling. This book is the most detailed introduction to UML, by reading this chapter, it is more clear that the importa

Analysis of callback ideas in android system design, android callbackI. Why do I write this article? During the process of gradually getting into touch with android development, I have found that many callback ideas are used in android (at least in app development. For example, the lifecycle of an activity and fragment are implemented by callback functions. One of the event processing mechanisms in android

before the first time the computer room charges, using the database is someone else's, cognition can only be built on the basis of others, such as the "database system principle" after learning the book, then go to the previous database, found that the database really need further optimization, the following is my design database of some ideas, I hope you will make some more comments. Database Designe-r Mod

From: 51cmm. comAuthor: Lu linsheng, Xiamen julong Software Engineering Co., Ltd.[2003/12/29] Abstract:FromProgramRuntime structure andSource codeTwo aspects of the organizational structure of the system architecture design should be considered to explore various factors, lists the system architecture design document

Memory is an important module in the Integrated Design of SOC (system on chip, on-chip system) and a significant proportion of cost in SOC. The software and hardware design of memory management is an important part of SOC Software Architecture Design. architects must balance

viewed the private message, it returns to this notice table and marks it as handled or deleted directly. However, there is a problem in the case of large data volumes or high concurrency. When the user has checked the new private message, the user can mark it in the notice table, for various reasons, the corresponding "unread message reminder" has not been written into the system. In this case, a problem occurs. When the user requests whether there i

A system Rights Management design schemeDue to the large-scale development of the company, the OA system should be required to keep up with the pace of development, I decided to redo the system again.Now do the pre-system analysis, currently encountered a difficulty: the Aut

access, while the number of online up to hundreds of thousands of, when the background application services to expand to thousands of instances to cope with such high concurrent access requests; After a peak period, the Background app service can shrink to dozens of instances. With the distributed system, it is easy to dispatch application service instances, from dozens of to hundreds of or even thousands, to truly implement the elastic extension of

1. Applicability: Remote Monitoring System for Food and Beverage chains: restaurants, hotels, coffee shops, restaurants, and fast food restaurants. 2. Demand Analysis: The main purpose of the space for chain stores is to provide catering and leisure and entertainment services to customers. The number of entry and exit personnel is large, and the population mobility is large. This creates conditions for criminals to sneak into these places to seek oppo

Practical System Design using MEF MVVM RX MOQ Unit Tests in wpfposted on could, by Arup Banerjeepreludethe project I s a simple temperature Converter WPF application which would allowuser to convert from Celsius to Fahrenheit and vice versa . The objective however isto demonstrate techniques that is important when building large-scale front-endenterprise Softwar E. I'll walk you through initial project ince