投稿時間:2022-05-07 16:17:09 RSSフィード2022-05-07 16:00 分まとめ(18件)

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python	Pythonタグが付けられた新着投稿 - Qiita	pythonでゲーム作成 pygame基礎	https://qiita.com/momiji777/items/82794532b5ccb5d775b1	importpygam	2022-05-07 15:44:55
python	Pythonタグが付けられた新着投稿 - Qiita	B - Exponential AtCoder	https://qiita.com/KKDDD/items/6da08d93c4eaca3ea5d6	nintinputansforiinrange	2022-05-07 15:10:33
js	JavaScriptタグが付けられた新着投稿 - Qiita	Next.jsで独自の404ページを定義する	https://qiita.com/sokon/items/9fd753bfcdcf6722a63b	rtdefaultfunctioncustom	2022-05-07 15:25:19
js	JavaScriptタグが付けられた新着投稿 - Qiita	Next.jsチュートリアル備忘録：Dynamic Routes	https://qiita.com/sokon/items/c780ecaa9c0cb285e92e	croutesdynamicroutespages	2022-05-07 15:19:16
Linux	Ubuntuタグが付けられた新着投稿 - Qiita	Ubuntu 20.04.4 とWindows10でデュアルブートをする	https://qiita.com/db0091/items/056f3307b814e30e3d9b	windows	2022-05-07 15:43:39
Linux	Ubuntuタグが付けられた新着投稿 - Qiita	【Debian】 aptでtrusted.gpgのdeprecationが出た際の対処	https://qiita.com/m-m-n/items/dbb245dc6dae6a170c70	debian	2022-05-07 15:20:19
海外TECH	DEV Community	How to start a Cryptocurrency Exchange using White Label Crypto Exchange software?	https://dev.to/gwen_adele29/how-to-start-a-cryptocurrency-exchange-using-white-label-crypto-exchange-software-5hnm	How to start a Cryptocurrency Exchange using White Label Crypto Exchange software Cryptocurrency exchange platforms are the modern equivalent of financial service companies in the crypto space Specifically they function similar to financial brokerages that deal in cryptocurrency and cater to the crypto market instead of dealing with fiat money and the stock market A cryptocurrency exchange offers its services to its users as intermediaries so that the users can exchange fiat money for cryptocurrency and vice versa Similarly the users can exchange one cryptocurrency for another using the appropriate trading pairs And in return for their services the exchange gains a transaction fee as payment With the increased accessibility to smart contract technologies Dapps and increased awareness for cryptocurrencies more and more people are venturing into the crypto space looking for exciting opportunities And this is where keen business enthusiasts can seize the chance of the emerging market by starting their cryptocurrency exchange The best way to get started is by using crypto exchange software How to start a cryptocurrency exchange business A cryptocurrency exchange business is predominantly done online due to the nature of the business itself being the exchange of digital assets Like any online platform the software used is the indicator of its potential The more flexible secure and customizable the software is the easier it will be for you to run your business Developing any software is not easy and a cryptocurrency exchange software is no different Furthermore unlike most software products out there software products that use cryptocurrency and blockchain technology are new and there are not many references available for you to refer them On top of that the public blockchain technology itself is a new field which is only a decade old In comparison we have had the internet for nearly forty years now Before we venture into the creation aspect let us look at the two major software development types Creating a Cryptocurrency Exchange from scratchUsing a Whitelabel Crypto Exchange softwareIn the first scenario the creative process of a brand new cryptocurrency exchange is a resource intensive pursuit It requires a large sum of money time equipment and energy to develop a platform from scratch Not to mention the sheer level of technical knowledge necessary to pull this off would be too much for one person or even for a small institution Even hiring the experts for the job would be a task in itself On the other hand a white label crypto exchange software is a ready made and fully customizable software that can be purchased and installed This software automatically comes with all the necessary basic trading and security features that are needed to run a cryptocurrency exchange In addition to that you can also further tailor it and add the unique customizations that you think would best suit your business needs Why is White label Crypto Exchange Software the better choice Entrepreneurs interested in starting a new business any new business for that matter would want to do it on the merit of their idea and their skillset A crypto exchange business requires a specific set of skills expertise and a vision And this is where the following aspects play a role in assuring you why White label crypto exchange software are the ideal choice Analysis   Developing a crypto exchange platform from the ground up is no easy task Market analysis is an absolute necessity You will have to conduct extensive research on what kind of platform you are trying to build An Order Book model an AMM model PP model OTC an Aggregator model etc You need to know the intricate difference between them and how to code the functions But when it comes to cryptocurrency exchange scripts you can choose the type of platform you want and purchase that exact product Every single feature and function that you wish for in the crypto exchange platform will be installed automatically by the developer Technical Expertise   The quality of any crypto exchange platform ultimately depends on the technical experts that helped design it Blockchain technology Layer blockchain Layer blockchain interoperability decentralized apps smart contract development and security subsystems All of these require specialized experts working around the clock to develop every single software module separately before they are carefully stitched together to make it work seamlessly The technical expertise needed to build a crypto exchange platform from the ground up is a nightmare However on the other hand a white label cryptocurrency exchange software is a pre tested ready made software product Security   Developing security systems for an online platform is an art form a difficult task because it concerns both the user and the admin HTTPS authentication Jail login two factor authentication ADoS ADDoS data encryption and more…A platform requires all these features and developing each of these as separate modules and then integrating them will take months of work and stress testing them is a task in itself Whereas with a white label cryptocurrency exchange software all these necessary security features come built into them as part of the product Customizations   Every software has to be tailored a little before using it for business When you are building a crypto exchange platform from scratch customization can be a hassle While not a difficult task it is a time consuming process nonetheless In a white label crypto exchange software you will be buying it from a developer who has all the tools and expertise needed for the process So you can have it customized for you exactly as you want it before you buy it from them It s an effective way to save yourself some time Add ons   Add on features are another major hindrance to developers Once the software is launched adding new features requires massive work and have to be done during each upgrade phase It has to be developed first and then the software has to be stopped to the public for some time and then added during that time But when it comes to white label crypto exchange software adding new features is a relatively easy task Since the add on module is pre made and tested an upgrade can be easily scheduled in mere hours Testing   Stress testing and troubleshooting are not often talked about They are a necessary part of the process when building a new crypto exchange platform Because a single error can cause problems later on A smart contract may have an error that can cause both parties to lose the money and the cryptocurrency which you will become liable for If not stress tested a hacker can backdoor into the platform itself and siphon out funds without you knowing it And testing often has to be done repeatedly over time for it to bear fruit All of this can be prevented with a white label crypto exchange because it will be extensively tested before the product is even launched for sale It s simply a more reliable option Duration   Time is a valuable resource Most crypto projects have a roadmap that estimates up to months That s months to develop a platform and to get it running properly And not all projects survive the process most of them fail either due to a lack of funding or the necessary expertise Most of them end up extending the time on the roadmap to six more months or another year because they cannot deliver the project on time With a white label crypto exchange script you don t have to deal with any of these problems you can have the platform up and running in days That s how easy and useful it is Cost    This is another extensively talked about subject because it s true Cost is a problem Imagine developing a crypto exchange business from scratch you have to recruit qualified members provide salary and allowance for the staff money for the equipment needed and space for them to work Monthly expenses on the space That doesn t even include the whitepaper auditing crowdfunding and development It can range from K to over a million dollars depending on the quality of the platform that you re building On the other hand a white label crypto exchange software is much cheaper it can be purchased and hosted with a mere K to K at best Deployment   Deployment is one of those minor problems You have to be very careful and very confident before deploying the platform because a single point error at the beginning can ruin the reputation of the platform itself First impressions are very important in the business market So after extensive testing you have to commit to a soft release with limited functions and then proceed to an official launch with all the features for the users later on It s not a debilitating problem but still a risky phase You ll have no problem when deploying a white label crypto exchange platform All the features are extensively tested long before you even buy them It s far less risky User friendly   As a developer it can be hard to visualize a user friendly platform when you re building it Online platforms are never user friendly when they are launched they become easier to use as more users use them and review them That s a part of the process during the initial launch However this is not an issue for white label products which are often modeled after existing online platforms hence they are often user friendly from the beginning Final WordsBusiness is the goal of any entrepreneur With cryptocurrency being the best performing asset of the last decade it s only logical that entrepreneurs want to invest their ideas their time and their resources into the crypto market But investing is not the same as developing a cryptocurrency exchange a white label crypto exchange script is by far the best way to get started at the earliest possible avenue And it is imperative that you find and reach one of the Best White Label Crypto Exchange Software Provider not just as a seller but also as a technical support firm to help your business grow as you go forward	2022-05-07 06:39:01
海外TECH	DEV Community	9 Best Software Architecture Patterns	https://dev.to/hussein_nm/9-best-software-architecture-patterns-44pc	Best Software Architecture Patterns What is an architectural pattern Just like the architecture of a building software architecture describes the design and collection of components into systems that make up the building blocks of software Software architecture explains the structural composition of the software program and the interactions between the elements The principle that defines the software organization schema for these software systems is called an architectural pattern The architectural pattern captures the design structures of various systems and elements of software so that they can be reused During the process of writing software code developers encounter similar problems multiple times within a project within the company and within their careers One way to address this is to create design patterns that give engineers a reusable way to solve these problems allowing software engineers to achieve the same output structurally for a given project Connect with me on LinkedIn From an engineer s perspective software architecture patterns are important because they drive efficiency and productivity Developers can join an existing project at any point with limited onboarding since they already understand the architecture pattern used in the project New features can also be added to the project without any difficulty and common application problems can be solved easily From the client s perspective architecture patterns optimize development costs speed up the project s timeline and allow the engineer to deliver a high quality product Cost estimates are based on an understanding of the architecture systems so product managers have a more accurate project cost allowing for early planning and budgeting Further a clearly defined architecture means the system has been validated and scoped This helps engineers focus on the essentials of the product and also allows managers to plan adequately for project completion There are different types of software architecture patterns but in this article we shall be exploring nine of them Model view controller patternThe model view controller MVC pattern divides an application into three components A model a view and a controller The model which is the central component of the pattern contains the application data and core functionality It is the dynamic data structure of the software application and it controls the data and logic of the application However it does not contain the logic that describes how the data is presented to a user The view displays application data and interacts with the user It can access data in the model but cannot understand the data nor does it understand how the data can be manipulated The controller handles the input from the user and mediates between the model and the view It listens to external inputs from the view or from a user and creates appropriate outputs The controller interacts with the model by calling a method on it to generate appropriate responses These three components interact via some form of notification such as an event or a callback These notifications contain state information such as state changes which are communicated to update these components For instance an external event from the user may be transmitted to the controller to update the view Therefore the MVC pattern decouples software components and allows the codes to be reused easily One advantage of the MVC pattern is that multiple engineers can work on all three components simultaneously without conflict Further the MVC allows the logical grouping of related outputs to generate numerous views from the model However one drawback is that navigating the framework could be complex as it introduces several layers of abstraction Layered pattern n tier The layered architecture pattern is the most common among developers It is useful for programs that comprise several groups of subtasks each of which is at a different level of abstraction Each of these subtasks is represented by a layer in the software ーa unit of modules that produces a cohesive set of services ーand each layer provides services to the next higher layer in a unidirectional pattern Each layer has a specific role within the application that is connected to the roles of other layers For instance a presentation layer also called the UL layer would handle all the UI and browser communication logic while a business logic layer would execute certain business requests Other types of layers include the application layer and the data access or persistence layer which then accesses the database layer This allows the database layer to be separated and enables you to switch from an Oracle server to a SQL server without impacting the other layers ーit allows for lower transition costs These layers interact in a unidirectional pattern such that when a user initiates an input such as clicking a button the presentation layer sends messages to the lower layer the application layer which in turn calls the business layer then the data access layer that accesses the database So calls in a layered pattern flow downwards from a higher layer to a lower one Layered architecture patterns are found in many e commerce web applications and desktop applications It is also helpful for applications that need to be built quickly and enterprise applications that need to adopt traditional IT processes Furthermore a layered pattern is ideal for applications that require strict standards of testability A key advantage of this pattern is that it allows for an easy way to write a well organized application Since it is a popular architecture pattern developers already have an understanding of how it is used However it does have two major drawbacks Complexity and the cost of adding more layers These layers may eventually be hard to split up Usage Applications that are needed to be built quickly Enterprise applications that require traditional IT departments and processes Appropriate for teams with inexperienced developers and limited knowledge of architecture patterns Applications that require strict standards of maintainability and testability Shortcomings Unorganized source codes and modules with no definite roles can become a problem for the application Skipping previous layers to create tight coupling can lead to a logical mess full of complex interdependencies Basic modifications can require a complete redeployment of the application Microservices patternThe Microservices pattern involves creating multiple applications ーor microservices ーthat can work interdependently Although each microservice can be developed and deployed independently its functionality is interwoven with other microservices A key concept in the microservices pattern is the separate deployment of units This creates a streamlined delivery pipeline that allows for easy deployment of microservices and increases application scalability Another key feature of this pattern is that it is a distributed architecture meaning that the structure s components can be fully decoupled and accessed through remote access protocols such as REST SOAP or GraphQL This distributed nature of the pattern allows for its high scalability properties The microservices architecture uses several design patterns Aggregator pattern API gateway design pattern chain of responsibility pattern branch pattern and asynchronous messaging design pattern Each approach provides a method to manipulate data to produce services A major advantage of microservices architecture is the independent deployment of each microservice Engineers can write and maintain each microservice independent of the others potentially increasing its functionality and scalability Further because each microservice is small it is easier to rewrite and update Microservices architecture is best for web applications and websites with small components It is also useful for corporate data centers that have well defined boundaries Some challenges for microservices come up around complexity particularly in the network layer Furthermore decoupling services to work completely independently of each other requires significant architectural expertise The software can be like a baby elephant It is cute and fun when it s little but once it gets big it is difficult to steer and resistant to change The microservice architecture is designed to help developers avoid letting their babies grow up to be unwieldy monolithic and inflexible Instead of building one big program the goal is to create a number of different tiny programs and then create a new little program every time someone wants to add a new feature Caveats ·The services must be largely independent or else interaction can cause the cloud to become imbalanced ·Not all applications have tasks that can t be easily split into independent units ·Performance can suffer when tasks are spread out between different microservices The communication costs can be significant ·Too many microservices can confuse users as parts of the web page appear much later than others Best for ·Websites with small components·Corporate data centers with well defined boundaries·Rapidly developing new businesses and web applications·Development teams that are spread out often across the globe Event driven architectureMany programs spend most of their time waiting for something to happen This is especially true for computers that work directly with humans but it s also common in areas like networks Sometimes there s data that needs processing and other times there isn t The event driven architecture helps manage this by building a central unit that accepts all data and then delegates it to the separate modules that handle the particular type This handoff is said to generate an “event and it is delegated to the code assigned to that type Programming a web page with JavaScript involves writing the small modules that react to events like mouse clicks or keystrokes The browser itself orchestrates all of the input and makes sure that only the right code sees the right events Many different types of events are common in the browser but the modules interact only with the events that concern them This is very different from the layered architecture where all data will typically pass through all layers Overall event driven architectures ·Are easily adaptable to complex often chaotic environments·Scale easily·Are easily extendable when new event types appearCaveats ·Testing can be complex if the modules can affect each other While individual modules can be tested independently the interactions between them can only be tested in a fully functioning system ·Error handling can be difficult to structure especially when several modules must handle the same events ·When modules fail the central unit must have a backup plan ·Messaging overhead can slow down processing speed especially when the central unit must buffer messages that arrive in bursts ·Developing a systemwide data structure for events can be complex when the events have very different needs ·Maintaining a transaction based mechanism for consistency is difficult because the modules are so decoupled and independent Best for ·Asynchronous systems with asynchronous data flow·Applications where the individual data blocks interact with only a few of the many modules·User interfaces Client server patternIn the client server architecture patterns there are two main components The client which is the service requester and the server which is the service provider Although both client and server may be located within the same system they often communicate over a network on separate hardware The client component initiates certain interactions with the server to generate the services needed While the client components have ports that describe the needed services the servers have ports that describe the services they provide Both components are linked by request reply connectors A classic example of this architectural pattern is the World Wide Web The client server pattern is also used for online applications such as file sharing and email A simple example is online banking services When a bank customer accesses online banking services using a web browser the client initiates a request to the bank s web server In this case the web browser is the client accessing the bank s web server for data using the customer s login details The application server interprets this data using the bank s business logic and then provides the appropriate output to the webserver One major advantage of this architecture pattern is the central computing of data all files are stored in a central location for this network Therefore the data as well as the network peripherals are centrally controlled A disadvantage however is that the server is expensive to purchase and manage The client server model is related to the peer to peer architecture pattern and is often described as a subcategory of this pattern The latter uses a decentralized system in which peers communicate with each other directly Usage Applications like emails online banking services the World Wide Web network printing file sharing applications gaming apps etc Applications that focus on real time services like telecommunication apps are built with a distributed application structure Applications that require controlled access and offer multiple services for a large number of distributed clients An application with centralized resources and services that has to be distributed over multiple servers Shortcomings Incompatible server capacity can slow down causing a performance bottleneck Servers are usually prone to a single point of failure Changing the pattern is a complex and expensive process Server maintenance can be a demanding and expensive task Microkernel Architecture PatternThis architecture pattern consists of two types of components ーa core system and several plug in modules While the core system works on minimal functionality to keep the system operational the plug in modules are independent components with specialized processing If we take a business application s perspective the core system can be defined as general business logic without the custom code for special cases special rules or complex conditional processes On the other hand the plug in modules are meant to enhance the core system in order to produce additional business capabilities Taking the example of a task scheduler application the microkernel contains all the logic for scheduling and triggering tasks while the plug ins contain specific tasks As long as the plug ins adhere to a predefined API the microkernel can trigger them without having to know the implementation details Usage Applications that have a clear segmentation between basic routines and higher order rules Applications that have a fixed set of core routines and a dynamic set of rule that needs frequent updates Shortcoming The plugins must have good handshaking code so that the microkernel is aware of the plugin installation and is ready to work Changing a microkernel is almost impossible if there are multiple plugins dependent on it It is difficult to choose the right granularity for the kernel function in advance and more complex at a later stage Space based architectureMany websites are built around a database and they function well as long as the database is able to keep up with the load But when usage peaks and the database can t keep up with the constant challenge of writing a log of the transactions the entire website fails The space based architecture is designed to avoid functional collapse under high load by splitting up both the processing and the storage between multiple servers The data is spread out across the nodes just like the responsibility for servicing calls Some architects use the more amorphous term “cloud architecture The name “space based refers to the “tuple space of the users which is cut up to partition the work between the nodes “It s all in memory objects says Richards “The space based architecture supports things that have unpredictable spikes by eliminating the database Storing the information in RAM makes many jobs much faster and spreading out the storage with the processing can simplify many basic tasks But the distributed architecture can make some types of analysis more complex Computations that must be spread out across the entire data set ーlike finding an average or doing a statistical analysis ーmust be split up into sub jobs spread out across all of the nodes and then aggregated when it s done Caveats ·Transactional support is more difficult with RAM databases ·Generating enough load to test the system can be challenging but the individual nodes can be tested independently ·Developing the expertise to cache the data for speed without corrupting multiple copies is difficult Best for ·High volume data like clickstreams and user logs·Low value data that can be lost occasionally without big consequences ーin other words not bank transactions·Social networks Master Slave Architecture PatternImagine a single database receiving multiple similar requests at the same time Naturally processing every single request at the same time can complicate and slow down the application process A solution to this problem is a master slave architecture pattern that functions with the master database launching multiple slave components to process those requests quickly As the title suggests the master slave architecture pattern can be pictured as a master distributing tasks to its slaves Once the slave components finish their tasks the distributed tasks are compiled by the master and displayed as the result One must note that the master has absolute control and power over the slave components determining their communication and functional priorities What makes this pattern unique is that each slave would process the requests simultaneously providing the results at the same time This also means that the slave operations would not be considered complete until every slave has returned the result to the master This pattern is well suited for applications that can be divided into smaller segments for executing similar requests An appropriate example would be a database application that requires heavy multitasking as its vital component Usage Development of Operating Systems that may require a multiprocessors compatible architecture Advanced applications where larger services have to be decomposed into smaller components Applications process raw data stored in different servers over a distributed network Web browsers that follow multithreading to increase their responsiveness Shortcomings Failure of the master component can lead to a loss of data with no backup over the slave components Dependencies within the system can lead to a failure of the slave components There can be an increase in overhead costs due to the isolated nature of the slave components Pipe Filter Architecture PatternA pipe filter architecture pattern processes a stream of data in a unidirectional flow where components are referred to as filters and pipes are those which connect these filters The chain of processing data takes place where the pipes transmit data to the filters and the result of one filter becomes the input for the next filter The function of this architecture is to break down significant components processes into independent and multiple components that can be processed simultaneously The pipe filter pattern is best suited for applications that process data in a stream using web services and can create simple sequences to complex structures Compilers can be considered a fitting example of having this architecture pattern since each filter performs lexical analysis parsing semantic analysis and code generation Usage It can be used for applications facilitating a simple one way data processing and transformation Applications using tools like Electronic Data Interchange and External Dynamic List Development of data compilers used for error checking and syntax analysis To perform advanced operations in Operating Systems like UNIX where the output and input of programs are connected in a sequence Shortcomings ·There can be a loss of data in between filters if the infrastructure design is not reliable ·The slowest filter limits the performance and efficiency of the entire architecture ·During transmission between filters the data transformation overhead costs might increase ·The continuous transformational character of the architecture makes it less user friendly for interactional systems ー If you are interested follow me and likeThank youLinkedIn Medium hussein nm Resources	2022-05-07 06:26:52
海外TECH	DEV Community	Project Three: Sudoku Solver	https://dev.to/shiahalan/project-three-sudoku-solver-15b2	Project Three Sudoku Solver Why Hello this is my third posted project This project was created with the intention of exposing myself to Python Stack Overflow GitHub BASH and the backtracking algorithm HowThis project uses a D list for the representation of the board The solver works by implementing the backtracking algorithm Utilizing recursion backtracking the algorithm can use brute force to solve the board ConclusionI hope you enjoy this part of my learning journey GitHub Advice Advice is greatly appreciated post in comment section	2022-05-07 06:09:58
ニュース	BBC News - Home	Chelsea agree sale terms with LA Dodgers' Todd Boehly	https://www.bbc.co.uk/news/business-61360374?at_medium=RSS&at_campaign=KARANGA	football	2022-05-07 06:19:16
ニュース	BBC News - Home	Newport: Can an Instagram-able market save a city centre?	https://www.bbc.co.uk/news/uk-wales-60983910?at_medium=RSS&at_campaign=KARANGA	empty	2022-05-07 06:11:22
北海道	北海道新聞	上川管内で３２０人感染　旭川は２４７人　新型コロナ	https://www.hokkaido-np.co.jp/article/677933/	上川管内	2022-05-07 15:15:00
北海道	北海道新聞	胸に包丁、２３歳従業員死亡　長崎・対馬、殺人の疑いも	https://www.hokkaido-np.co.jp/article/677932/	長崎県対馬市美津島町根緒	2022-05-07 15:21:00
北海道	北海道新聞	後志管内で１０１人感染　新型コロナ	https://www.hokkaido-np.co.jp/article/677931/	新型コロナウイルス	2022-05-07 15:20:00
北海道	北海道新聞	ホンダ、中国販売３６％減　４月、上海封鎖で供給混乱	https://www.hokkaido-np.co.jp/article/677929/	新車販売台数	2022-05-07 15:12:00
北海道	北海道新聞	春の高校野球支部予選・５月７日の試合結果	https://www.hokkaido-np.co.jp/article/677888/	春の高校野球	2022-05-07 15:05:56
IT	週刊アスキー	アップル「M2版MacBook Air」はノッチ付き？	https://weekly.ascii.jp/elem/000/004/090/4090875/	macbook	2022-05-07 15:30:00
IT	週刊アスキー	飲むハロハロ登場！ ミニストップの「ハロハロラムネ」が大容量サイダーに	https://weekly.ascii.jp/elem/000/004/090/4090882/	炭酸飲料	2022-05-07 15:30:00