投稿時間:2022-07-07 23:43:38 RSSフィード2022-07-07 23:00 分まとめ(55件)

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AWS	AWS Management Tools Blog	Automate AWS Systems Manager activation for hybrid-managed node registration	https://aws.amazon.com/blogs/mt/automate-aws-systems-manager-activation-for-hybrid-managed-node-registration/	Automate AWS Systems Manager activation for hybrid managed node registrationAWS Systems Manager formerly known as SSM is an AWS service that you can use to view and control your servers on AWS cloud and on premises infrastructure Systems Manager makes it easy to manage a hybrid environment To set up servers and virtual machines VMs in your hybrid environment as Systems Manager managed instances you …	2022-07-07 13:22:27
AWS	AWS Management Tools Blog	Using Amazon CloudWatch metrics math to monitor and scale resources	https://aws.amazon.com/blogs/mt/using-amazon-cloudwatch-metrics-math-to-monitor-and-scale-resources/	Using Amazon CloudWatch metrics math to monitor and scale resourcesMany applications require monitoring scaling and alerting across multiple dimensions This requirement adds operational complexity for Developer Operations DevOps teams as they must track numerous discrete data points Instead you can use Amazon CloudWatch metric math to create composite metrics quickly and easily In this post you ll learn to apply these concepts to monitoring dashboards …	2022-07-07 13:07:51
AWS	AWS Management Tools Blog	Using Business Agility to Unlock Business Value while Migrating to AWS	https://aws.amazon.com/blogs/mt/using-business-agility-to-unlock-business-value-while-migrating-to-aws/	Using Business Agility to Unlock Business Value while Migrating to AWSIn a recent article by McKinsey Unlocking value Four lessons in cloud sourcing and consumption enterprises estimate that around of their cloud spend is wasted Furthermore approximately of enterprises consider managing cloud spend a challenge Even though over of enterprises cite optimizing cloud spend as a major goal it remains an …	2022-07-07 13:03:31
python	Pythonタグが付けられた新着投稿 - Qiita	【python-OpenCV】画像への文字入れの「位置指定」と「縁取り」を少しだけ便利にする関数作った	https://qiita.com/xenepic/items/06b30b3610823f178091	opencv	2022-07-07 22:42:13
js	JavaScriptタグが付けられた新着投稿 - Qiita	Electronメインプロセス中にレンダラーのasarファイルをダウンロードして開く方法	https://qiita.com/dimyasvariant/items/e95f0b904596fedd4243	electron	2022-07-07 22:06:22
Ruby	Rubyタグが付けられた新着投稿 - Qiita	rails7でomniauthで認証しようとしたらエラーばっかりでうまくいかなかった	https://qiita.com/hatobeam75/items/fd292d2a16c11022e3c7	dotnet	2022-07-07 22:24:26
Docker	dockerタグが付けられた新着投稿 - Qiita	16.3.3.2 Exposition-only functions [expos.only.func] C++N4910:2022 (258) p469.cpp	https://qiita.com/kaizen_nagoya/items/acda0b79e4205a9b74f3	draft	2022-07-07 22:17:21
Docker	dockerタグが付けられた新着投稿 - Qiita	15.12 Pragma operator [cpp.pragma.op] C++N4910:2022 (257) p463.cpp	https://qiita.com/kaizen_nagoya/items/4b30e7aa7bd1026b5e63	draft	2022-07-07 22:11:02
Docker	dockerタグが付けられた新着投稿 - Qiita	15.6.5 Rescanning and further replacement [cpp.rescan] C++N4910:2022 (256) p459.cpp	https://qiita.com/kaizen_nagoya/items/be459556c4a65e91f1d9	draft	2022-07-07 22:06:10
golang	Goタグが付けられた新着投稿 - Qiita	DDDをざっくり理解してみる②　～ドメインサービスとリポジトリ編～	https://qiita.com/2san/items/b52c0828e1fec03ebed1	記事	2022-07-07 22:01:14
Git	Gitタグが付けられた新着投稿 - Qiita	【GitHub】デフォルトブランチの変更方法	https://qiita.com/SNQ-2001/items/b3e188550540e82f3457	branch	2022-07-07 22:03:21
Ruby	Railsタグが付けられた新着投稿 - Qiita	rails7でomniauthで認証しようとしたらエラーばっかりでうまくいかなかった	https://qiita.com/hatobeam75/items/fd292d2a16c11022e3c7	dotnet	2022-07-07 22:24:26
技術ブログ	Developers.IO	沖縄の愛すべき看板たち	https://dev.classmethod.jp/articles/okinawa-kanban-love/	落ち着き	2022-07-07 13:50:40
技術ブログ	Developers.IO	従業員体験を扱う部門のオンボーディング体験を高める部門オンボーディングを整備した	https://dev.classmethod.jp/articles/implement-division-onboarding/	立ち上がり	2022-07-07 13:38:59
技術ブログ	Developers.IO	AWS IoT SiteWise ゲートウェイのデータを Amazon QuickSight で分析するための AWS IoT Analytics 環境を AWS CloudFormation で作成してみた	https://dev.classmethod.jp/articles/aws-iot-sitewise-cloudformation-iot-analytics/	AWSIoTSiteWiseゲートウェイのデータをAmazonQuickSightで分析するためのAWSIoTAnalytics環境をAWSCloudFormationで作成してみた以前、SiteWiseゲートウェイで収集した設備機器の稼働データをIoTAnalyticsでデータ変換してQuickSightで利用する方法を紹介しました。	2022-07-07 13:36:19
技術ブログ	Developers.IO	Security Hub 自動修復ソリューションの修復内容をまとめてみた(v1.5.0)	https://dev.classmethod.jp/articles/aws-security-hub-auto-remediation-playbooks/	awssecurityhub	2022-07-07 13:30:50
技術ブログ	Developers.IO	AWS IAMロールAnywhereのPKI基盤にHashicorp Vaultを使う	https://dev.classmethod.jp/articles/hashicorp-vault-pki-for-iam-role-anywhere/	anywhere	2022-07-07 13:19:31
海外TECH	Ars Technica	Even the Webb telescope’s engineering test images manage to wow	https://arstechnica.com/?p=1864769	wowthe	2022-07-07 13:21:07
海外TECH	MakeUseOf	What Is Madware and How Can Your Protect Against It?	https://www.makeuseof.com/what-is-madware/	What Is Madware and How Can Your Protect Against It Malware including adware doesn t just target your PC and laptop Madware in particular is aimed at your other devices Here s how to avoid it	2022-07-07 13:30:15
海外TECH	MakeUseOf	Amazon Echo Dot (4th Gen): Good Budget Smart Speaker for Smaller Rooms	https://www.makeuseof.com/amazon-echo-dot-4th-gen-review/	audio	2022-07-07 13:05:14
海外TECH	DEV Community	Top 7 template engines for Node JS 2022	https://dev.to/alltimedevlopment/top-7-template-engines-for-node-js-2022-43na	Top template engines for Node JS Top template engines for Node JS Today we are going to discuss the top template engines for Node JS and if you want to know about what are template engines and more then you can visit this post In this post I have explained template engines and pug So if you will like our post then share it with your developer friends MustacheMustache is a logicless template engine as it lacks any explicit control flow statements It is used for creating dynamic content like HTML configuration files among other things and more It is considered the base of JavaScript templating Its first version was Mustache which was inspired by template and et and it was started as a distribution at Github at the end of if you wondered what is a distribution then it is a toolkit to pack ship store and deliver container content its developers gave its name Mustache because of heavy use of braces which seems as a Mustache and there are more than companies in the world that use Mustache for serving dynamic content including Twitter LinkedIn and more popular companies Another fact about its first version is that it was implemented with Ruby by running simple YAML texts and it is not only available for Node JS JavaScript but its implementations are available for several other languages like r ActionScript C Clojure CoffeeScript ColdFusion Common Lisp Crystal D Dart Delphi Elixir Erlang Fantom Go Haskell Go Java JavaScript Julia Lua etc Mustache is used mainly for mobile and web applications it has a very big community as its the most popular JavaScript template engine means that if you face any error on Mustache then its solutions are easily available and along with that it is Open source its Github repository name is HandleBars JSHandleBars JS is also a template engine like Mustache it is very powerful simple to use and has all features like Mustache with a big community which will help you solve the errors you may find But if you want to see that between Mustache and HandleBars JS which is better than you can visit my blog and can search Mustache vs Handlebars the link of the blog is given in the header It is based on the Mustache template language only but has some different features as well like you can separate the generation of HTML from the rest of your JavaScript and write cleaner code it provides logic less templates which do a great job of forcing you to separate presentation from logic Clean syntax leads to templates that are easy to build read and maintain Compiled rather than interpreted templates Better support for paths than mustache ie reaching deep into a context object Better support for global helpers than mustache and more It is an extension to the Mustache templating language which was created by a developer named Chris Wanstrath Some similar things between both of them are that both Mustache and HandleBars JS provides a logicless template and both of them are open source Its Github Repository link The only con that I don t like about it is that it Requires server side JavaScript to render on the server and there are many different companies in the world which are using HandleBars JS for their projects like Slack Alibaba Travels MasterCard Fiverr Hulu Sap Starbucks GoDaddy Zools and many more It is integrated with Mustache and Squido doT JSdoT JS is a small efficient and is very fast and lightweight template engine that only supports itself it has no dependencies and works really awesome with Node JS which is a JavaScript Runtime and native browser integrations Due to its compabitlity with the m it works outstanding and it also faster compared to other template engines But it has a lot of features rather than that like Super fast encoding whitespace control compile time evaluation run time evaluation run time interpolation and custom delimiters conditional support partials support array iterators and more are some features of doT JS But there are also some cons that I faced using doT JS there is not much information available in Google about doT JS and there are very fewer forums available for doT JS It is also integrated with GULP Gulp is a cross platform streaming task runner that lets developers automate many development tasks At a high level gulp reads files as streams and pipes the streams to different tasks These tasks are code based and use plugins The tasks modify the files building source files into production files To get an idea of what gulp can do check the list of gulp recipes on GitHub and JavaScript Its author and GitHub source provider is Laura Doktorova MIT license their GitHub repositories is and companies like PT and SAFS FE and more and as a fun fact it is inspired from jQote and underscore js plugins I would also recommend you using this as it is very user friendly and perfect for both beginners and professional web devs and if you want to know how to use it install it and more then you can visit their GitHub repository EJS Embedded JavaScript Templates EJS is also one of the most popular and my personal favorite template engines But if you are might wondering what is the full form of EJS then its full form is Embedded JavaScript Templates and it was developed by It is an awesome and lightweight template engine for creating HTML markup with simple JavaScript Java code and if you want a template engine that organizes your JavaScript code then EJS makes the work simple for you It has fast code execution and ease of debugging and for those also who want to do HTML work with their favorite language presumably JavaScript then this is a good option for them too Template caching and partials Intelligent error handling with line numbers and quick for templating UI project there is a quite good and large community means that if you have any problem or error while using EJS you can find its solution and docs are also fine which you can find on their website ejs co and the two best things that I liked about EJS is that it is also Open Source like Mustache and HandleBars JS Its Github repository is and it Complies with the Express view system but along with pros there are some cons of EJS like it is very difficult to read its code especially for designers and HTML people who don t focus on Backend languages and one more con is that it has no support for block by default But it s Ok as every language has both pros and cons Companies like Angry Ventures My Franchise WEB DEV Loop Stack Gridle TechStack are using EJS for their projects NunJucksNunJucks is also a very popular template engine It is a very rich and powerful templating language It was created by Mozilla owner of Firefox Engine It is good for both beginners as it is easy to learn has a good and big community open source free and for experts also who want a powerful template engine which must be light and also the execution must be fast and flawless It also has block inheritance auto escaping macros asynchronous control flexible extendable with custom filters and more pros It is very inspired by jinja which is a template engine for Python It supports all modern browsers like Google Chrome Mozilla Firefox Microsoft Edge and you can also employ Nunjucks on Node It is also integrated with JavaScript and Lumeland Lume Companies like AO com Upload Care Zingat Feelway Iruka Madyourself AKQA com F biz are using it There GitHub repository is Underscore JSUnderscore JS which is also a very popular templating engine is an external JavaScript library that provides functional helpers that keep the code base intact It is developed by two developers Jeremy Ashkenas and Julian Gonggrijp They provide functions that you can use that supports your favorite workaday functional helpers like map filter invoke and more without extending any built in objects It supports function binding javascript templating creating quick indexes and deep equality testing Underscore JS is integrated with JScramble which provides enterprise grade security solutions that secure the client side of web and hybrid mobile applications There are many pros of Underscore JS like it is fast simple open source backbone source code is annotated it is a library good community and good documentation and more But there are some certain things that people don t like about it like its UI is very ugly you have to include the whole library inside your project and people also complain that they don t like the syntax of chain function putting the value function at the end of the line of the code is verbose and ugly that s why Its GitHub repository is Companies are used by large companies like Pinterest Tesla Motors Figma Coursera PostMan Reddit LinkedIn Tumblr Alibaba Hulu and more WebixWebix is a template engine that you can use for a rapid process of development It has a fantastic and beautiful UI library and framework and there are more than JavaScript widgets and controls await at every user like data tables filters charts menus sidebars carousels and heaps and more are there at Webix With them you can create touch screen web applications for touch screen devices like Mobiles with HTML framework very fast or even a prototype or anything you want It is flexible extendable high performing and user friendly too In Webix there are different pricing packages that you can choose according to your need and requirement which you can check out on their site webix com It has Snippet Tool Form Builder Skin Builder Webix Jet and more It is cross platform has a big community which will help you if you face any problem and for installation purposes they also provide documentation which is also very good and it is open source their Github repository is It is integrated with JavaScript React Bootstrap which is a front end library and Pattern Lab A con about Webix is that it is quite expensive So if you are ready to go with it Webix is for you Companies like Gamned OPUS InMobi are companies that are using Webix for their projects But all those web development backend and frontend works need a good laptop and if you want to buy a new laptop then you can visit my post on realme book post and their I have discussed that is realme a good laptop for not only web development and also a little bit of gaming	2022-07-07 13:30:58
海外TECH	DEV Community	Data Types in Python	https://dev.to/jindalkeshav82/data-types-in-python-2ino	Data Types in Python IntroductionVariable in python stores different kind of data and these are INTEGER TYPE OF DATAAs the name suggest it contain positive or negative type of data It is used by the keyword int FloatIt contains decimal type of data StringIt contains a message to be executed to the user and it is enclosed in quotes Tuple It can contain more than one type of data in one variable They are enclosed in NOTE Tuple value is unchangeable ListsThey contain multiple data in them They are enclosed in square brackets Sets With the help of Sets we can make many sets of different data and they are enclosed in	2022-07-07 13:24:38
海外TECH	DEV Community	Advanced TV Remote controlled robot	https://dev.to/ndrohith/advanced-tv-remote-controlled-robot-2739	Advanced TV Remote controlled robotIn this blog I will show you how to build an Advanced TV Remote controlled robot with a TSOP Sensor TV remote and an Arduino microcontroller Components requiredArudino UNOTSOP SensorGear MotorsIC LDTV remote Arduino UNOArduino is an opensource electronics platform based on easy to use hardware and software Arduino boards are able to read inputs light on a sensor a finger on a button or a twitter message and turn it into an output activating a motor turning on a LED publishing something online To do so use the Arduino programming language based on wiring and the Arduino Software IDE based on processing TSOP IR sensorTSOP module is commonly found at the receiving end of an IR remote control system such as in televisions CD players and so on These modules require that the incoming data be modulated at a specific frequency and ignore any other IR signals Gear MotorsIt is a DC motor with a gear box for decreasing the speed and increasing the torque and power This type of motors is commonly used for robotic applications IC LDIC LD is a dual H bridge motor driver integrated circuit that can drive current of up to mA with voltage range of to volts Codeint tsop int leftmotor int leftmotor int rightmotor int rightmotor void setup Serial begin pinMode tsop INPUT pinMode leftmotor OUTPUT pinMode leftmotor OUTPUT pinMode rightmotor OUTPUT pinMode rightmotor OUTPUT void loop int remote val remote if remote val no in sony remote digitalWrite leftmotor HIGH digitalWrite leftmotor LOW digitalWrite rightmotor HIGH digitalWrite rightmotor LOW Serial println forward if remote val no in sony remote digitalWrite leftmotor LOW digitalWrite leftmotor HIGH digitalWrite rightmotor LOW digitalWrite rightmotor HIGH Serial println backward if remote val no in sony remote digitalWrite leftmotor HIGH digitalWrite leftmotor LOW digitalWrite rightmotor LOW digitalWrite rightmotor HIGH Serial println right if remote val no in sony remote digitalWrite leftmotor LOW digitalWrite leftmotor HIGH digitalWrite rightmotor HIGH digitalWrite rightmotor LOW Serial println left if remote val no in sony remote digitalWrite leftmotor LOW digitalWrite leftmotor LOW digitalWrite rightmotor LOW digitalWrite rightmotor LOW Serial println stop int remote int value int time pulseIn tsop LOW if time gt for int counter counter lt counter if pulseIn LOW gt value value lt lt counter return value	2022-07-07 13:09:48
海外TECH	DEV Community	Alchemical Reduction	https://dev.to/rmion/alchemical-reduction-45jg	Alchemical Reduction Advent of Code Day Try the simulator using your puzzle input Task Solve for X where Part X the number of units remaining after fully reacting the polymer I scanned Part X the length of the shortest polymer I can produce by removing all units of exactly one type and fully reacting the result Example inputdabAcCaCBAcCcaDAIt represents A polymerComprised of units of different types and polaritiesUnits types are represented by lettersUnits polarity is represented by capitalization Part Many approaches What s a smart one Animating my first algorithmic ideaWriting a working algorithmBuilding the simulator Many approaches What s a smart one The examples allude to continually re processing the input for polar opposite same type letter pairsBut my puzzle input is thousands of characters longI definitely don t want to be re assigning smaller strings with each passI suppose I could use an arrayAnd do a lot of splicing maybe Animating my first algorithmic ideaUsing this example input dabAcCaCBAcCcaDAI want to Walk the whole string one character at a timeLook ahead one characterIf both must be destroyed step back one character and remove both characters one and two ahead If none should be destroyed step forward one character Writing a working algorithmIt s slightly different from what s depicted in the animation above Start at index and go until the rd to last value Check the values at the locations one and two ahead of index If both values are different but when uppercased are equal Remove both from the list of characters Decrement index by one to move back one character in case the new character one ahead causes the character at index to become a matching pair Else increment index by to move to the next characterReturn the length of the list of charactersThe results It worked on every sampleIt worked on the exampleIt worked on my puzzle input It took a few seconds so I m very glad I went with this approach instead of thousands of iterations one for each subsequent removal Building the simulatorI was excited to watch the characters continually get removed After building it and watching it run I m very happy with my decision to make it It s like The Matrix only horizontal Try the simulator for Part using your puzzle input Part The same but with fewer and a lot more times How my anticipated algorithm will workTesting my algorithm Error Testing my algorithm again Success Simulator Update or not The same but with fewer and a lot more times I still need to count the characters remaining after reducing my polymerBut before I do I need to remove all instances of one unit both polarities And I need to do that for all unit types How my anticipated algorithm will workFor each letter case insensitive Replace all matches for that letter in the polymer with nothing thereby removing all matches Reduce the polymer Return the length of the reduced polymerReturn the smallest length of all the mutated and reduced polymersTime to write it Done Time to test it Testing my algorithm Error It worked on the example input It broke on my puzzle input Hmm Why More specifically It broke when processing the letter KMy puzzle input starts KWwBbJMy algorithm starts a location at so it can check the values at position and When I remove all K ks I get WwBbJMy algorithm does this index check and W wMatch Remove Decrement index by index check and ERROR That s it I fixed my algorithm with an added condition for whether index is greater than then decrement it Testing my algorithm again Success Time to test it again It worked on the example input It worked on my puzzle input Simulator Update or not It was fun to simulate one polymer reductionFunnily enough it would take several minutes to finishSo the fun was in watching the characters whizz by and not in seeing it finishFor Part I could attempt to simultaneously simulate all of the separate polymer reductions But that doesn t feel worth the reward So I vote Not I did it I solved both parts I made a simulator for Part I made a GIF to think through my anticipated algorithmI learned new ways to use RegExp and replaceAll I was able to quickly troubleshoot my algorithm s unexpected error	2022-07-07 13:08:11
海外TECH	DEV Community	What you can get from a SaaS Marketplace?	https://dev.to/san0198/what-you-can-get-from-a-saas-marketplace-13ck	What you can get from a SaaS Marketplace What is SaaS marketplace SaaS is a subscription based software solution with reduced initial expenses This is ideal for start ups or small enterprises that may lack the funds to pay for software upfront It may be accessed through the internet from any device at any time There is no need for software installation or maintenance simply access it through the Internet saving yourself from complex software and hardware management To use the SaaS all you need is an internet connection Where can you purchase the SaaS product A SaaS Marketplace is required to purchase or sell a SaaS product There are numerous SaaS marketplaces where you may purchase the software for a reasonable cost lifetime membership Customers can visit an online shop at a SaaS marketplace to search purchase and administer cloud based SaaS apps A marketplace allows a range of vendors to advertise their products and services SaaS Marketplace assists in obtaining extensions such as plugins applications or other integration to expand your core product and make it more available to users SaaS Marketplace TypesSaaS Marketplace comes in a variety of kinds includingPlugin StoresIntegration MarketplaceReview SitesPlugin Stores A developer in a marketplace adds a specific function to existing computer software and assists with modification Integration Marketplace It assists with the integration of other apps Review Sites They categorize the application and provide people early access Customers can take advantage of a variety of discounts and promotions from SaaS Marketplace If you re looking for a SaaS Marketplace check out SaaS Mantra where the best deals are available and you can save more money every month	2022-07-07 13:07:27
海外TECH	DEV Community	Anyone tried PR reviews together as a team every day?	https://dev.to/rohithmenon89/anyone-tried-pr-reviews-together-as-a-team-every-day-7g8	individual	2022-07-07 13:06:56
海外TECH	DEV Community	12 Ways of Getting Ready for Microservices	https://dev.to/semaphore/12-ways-of-getting-ready-for-microservices-21p1	Ways of Getting Ready for MicroservicesYour team decided it s time to get rid of that old clunky monolith finally You had a good run with it but the monolith has grown so big that you re spending more effort maintaining it than adding features It s time to try a different approach It seems microservices are very popular these days so maybe it makes sense to dig a bit deeper there and see what all the fuss is about A word of advice don t write off the monolith just yet With some preparation it can serve you well all the way through the transition Here are tips for making the transition to microservices smooth as possible Ensure you know what you re getting intoA rewrite is never an easy journey but by moving from monolith to microservices you are changing more than the way you code you are changing the company s operating model Not only do you have to learn a new more complex tech stack but management will also need to adjust the work culture and reorganize people into smaller cross functional teams How to best reorganize the teams and the company are subjects worthy of a separate post In this article I want to focus on the technical aspects of the migration First it s important to research as much as possible about the tradeoffs involved in adopting microservices before even getting started You want to be absolutely sure that microservices and not other alternative solutions such as modularized monoliths are the right solution for you Start by learning everything you can about the microservice architecture and check some example projects to get an idea of how it works Here are some examples Building Go Microservice with Gin and CI CD CI CD for Microservices on DigitalOcean Kubernetes CI CD for Microservice Spring Boot Make a planIt takes a lot of preparation to tear down a monolith since the old system must remain operational while the transition is made The migration steps can be tracked with tickets and worked towards in each sprint like any other task This not only helps in gaining momentum to actually someday achieve the migration but gives transparency to the business owners regarding how the team is planning on implementing such a large change During planning you have to Disentangle dependencies within the monolith Identify the microservices needed Design data models for the microservices Develop a method to migrate and sync data between monolith and microservices databases Design APIs and plan for backward compatibility Capture the baseline performance of the monolith Set up goals for the availability and performance of the new system Unless you re migrating from a fairly simple monolith you ll need advanced techniques such as Domain Driven Design DDD by your side If you ve never used it before I ve written a short introduction on applying DDD to microservices that s worth a read Put everything in a monorepoAs you break apart the monolith a lot of code will be moved away from it and into new microservices A monorepo helps you keep track of these kinds of changes In addition having everything in one place can help you recover from failures more quickly In all likelihood your monolith is already contained in one repository So it s just a matter of creating new folders for the microservices Use a shared CI pipelineDuring development you ll not only be constantly shipping out new microservices but also re deploying the monolith The faster and more painless this process is the more rapidly you can progress Set up continuous integration and delivery CI CD to test and deploy code automatically If you are using a monorepo for development you ll have to keep a few things in mind Keep pipelines fast by enabling change based execution or using a monorepo aware build tool such as Bazel or Pants This will make your pipeline more efficient by only running changes on the updated code Configure multiple promotions one for each microservice and one more for the monolith Use these promotions for continuous deployment Configure test reports to quickly spot and troubleshoot failures Ensure you have enough testingRefactoring is much more satisfying and effective when we are sure that the code has no regressions Automated tests give the confidence to continuously ship out monolith updates An excellent place to start is the testing pyramid You will need a good amount of unit tests some integration tests and a few acceptance tests Aim to run the tests as often on your local development machine as you do in your continuous integration pipeline Install an API Gateway or HTTP Reverse ProxyAs microservices are deployed you have to segregate incoming traffic Migrated features are provided by the new services while the not yet ready functionality is served by the monolith There are a couple of ways of routing requests depending on their nature An API gateway lets you forward API calls based on conditions such as authenticated users cookies feature flags or URI patterns An HTTP reverse proxy does the same but for HTTP requests In most cases the monolith implements the UI so most traffic will go there at least at first Once the migration is complete the gateways and proxies will remain they are a standard component of any microservice application since they offer forwarding and load balancing They can also function as circuit breakers if a service goes down The monolith in a box patternOK this one only applies if you plan to use containers or Kubernetes for the microservices In that case containerization can help you homogenize your infrastructure The monolith in a box pattern consists of running the monolith inside a container such as Docker If you ve never worked with containers before this is a good opportunity to get familiar with the tech That way you ll be one step closer to learning about Kubernetes down the road It s a lot to learn so plan for a steep learning curve Learn about Docker and containers Run your monolith in a container Develop and run your microservices in a container Once the migration is done and you ve mastered containers learn about Kubernetes As the work progresses you can scale up the microservices and gradually move traffic to them Warm up to changesIt takes time to get used to microservices so it s best to start small and warm up to the new paradigm Leave enough time for everyone to get in the proper mindset upskill and learn from mistakes without the pressure of a deadline During these first tentative steps you ll learn a lot about distributed computing You ll have to deal with cloud SLA set up SLAs for your own services implement monitoring and alerts define channels for cross team communication and decide on a deployment strategy Pick something easy to start with like edge services that have little overlap with the rest of the monolith You could for instance build an authentication microservice and route login requests as a first step Use feature flagsFeature flags are a software technique for changing the functionality of a system without having to re deploy it You can use feature flags to turn on and off portions of the monolith as they are migrated experiment with alternative configurations or run A B testing An typical workflow for a feature flag enabled migration is Identify a piece of the monolith s functionality to migrate to a microservice Wrap the functionality with a feature flag Re deploy the monolith Build and deploy the microservice Test the microservice Once satisfied disable the feature on the monolith by switching the feature off Repeat until the migration is complete Because feature flags allow us to deploy inactive code to production and toggle it at any time we can decouple feature releases from actual deployment This gives developers an enormous degree of flexibility and control Modularize the monolithIf your monolith is a tangle of code you may very well end up with a tangle of distributed code once the migration is done Like tidying up a house before a total renovation modularizing the monolith is a necessary preparation step The modular monolith is a software development pattern consisting of vertically stacked modules which are independent and interchangeable The opposite of a modular monolith is the classic N tier or layered monolith Layered monoliths are hard to disentangle code tends to have too many dependencies sometimes circular making changes difficult to implement A modular monolith is the next best thing to microservices and a stepping stone towards them The rule is that modules can only communicate over public APIs and everything is private by default As a result the code is less intertwined relationships are easy to identify and dependencies are clear cut Two patterns can help you refactor a monolith the Strangler Fig and the Anticorruption Layer Strangler fig patternIn the Strangler Fig pattern we refactor the monolith from the edge to the center We chew at the edges progressively rewriting isolated functionality until the monolith is entirely redone Calls between modules are routed through the strangler façade which emulates and interprets the legacy code s inputs and outputs Bit by bit modules are created and slowly replace the old monolith Anticorruption layer patternYou will find that in some cases changes in one module propagate into others as you refactor the monolith To combat this you can create a translation layer between rapidly changing modules This anticorruption layer prevents changes in one module from impacting the rest Decoupling the dataThe superpower microservices give you is the ability to deploy any microservice at any time with little or no coordination with other microservices This is why data coupling must be avoided at all costs as it creates dependencies between services Each microservice must have a private and independent database It can be shocking to realize that you have to denormalize the monolith s shared database into often redundant smaller databases But data locality is what will ultimately let microservices work autonomously After decoupling you ll have to install mechanisms to keep the old and new data in sync while the transition is in progress You can for example set up a data mirroring service or change the code so transactions are written to both sets of databases Add observabilityThe new system must be faster more performant and more scalable than the old one Otherwise why bother with microservices You need a baseline to compare the old with the new Before starting the migration ensure you have good metrics and logs available It may be a good idea to install some centralized logging and monitoring service since it s a key component for the observability of any microservice application ConclusionThe journey to microservices is never an easy one But I hope that with these tips you can save some time and frustration Remember to iterate in small increments leverage CI CD to guarantee that the monolith is being tested for regressions and keep everything in one repository so you can always rewind if something goes wrong Happy coding and thanks for reading	2022-07-07 13:06:33
海外TECH	DEV Community	Testcontainers with MySQL and Redis with an Spring Boot Kotlin Application	https://dev.to/j_a_o_v_c_t_r/testcontainers-with-mysql-and-redis-with-an-spring-boot-kotlin-application-4bmf	Testcontainers with MySQL and Redis with an Spring Boot Kotlin ApplicationMicroservices architecture gives us some facilities such as independently deploy services with a unique responsibility working with different languages and so on However it also brings us some new complexities such as duplicated code observability tools distributed caches tools and logs tools When we think about all these resources working together we can think How can we test these resources For instance if our service uses Redis for cache and MySQL to save and retrieve data how can we do integration tests Doing these tests by yourself can be difficult but we have some manners to create that without much effort One option is using TestContainers To show you the tool I will test a Spring Boot Kotlin Application as example TestContainersTestcontainers is a Java library that supports JUnit tests providing lightweight throwaway instances of common databases Selenium web browsers or anything else that can run in a Docker container Testcontainers make the following kinds of tests easier Data access layer integration tests use a containerized instance of a MySQL PostgreSQL or Oracle database to test your data access layer code for complete compatibility but without requiring complex setup on developers machines and safe in the knowledge that your tests will always start with a known DB state Any other database type that can be containerized can also be used Application integration tests for running your application in a short lived test mode with dependencies such as databases message queues or web servers UI Acceptance tests use containerized web browsers compatible with Selenium for conducting automated UI tests Each test can get a fresh instance of the browser with no browser state plugin variations or automated browser upgrades to worry about And you get a video recording of each test session or just each session where tests failed Much more Check out the various contributed modules or create your own custom container classes using GenericContainer as a base Let s CodeThe application that will be used has a Car domain We can perform operations of inserting new cars searching for available cars and changing existing cars The system has a controller a service and a repository An overview of the architecture follows So when we do a POST request to an application the data is saved on MySQL DB When we do a GET request the application retrieves the data that is saved on DB and adds the information to Redis cache Redis is an open source in memory data store used by millions of developers as a database cache streaming engine and message broker Redis speed makes it ideal for caching database queries complex computations API calls and session state Data in RedisWe need to guarantee that the cache was saved in Redis For this we can use a tool called RedisInsight to see the data RedisInsight provides an intuitive Redis admin GUI and helps optimize your use of Redis in your applications It supports Redis Open Source Redis Stack Redis Enterprise Software Redis Enterprise Cloud and Amazon ElastiCache RedisInsight now incorporates a completely new tech stack based on the popular Electron and Elastic UI frameworks And it runs cross platform supported on Linux Windows and MacOS As we can see the cache s data is saved like a hash And if we don t do POST and PUT operations to the application this data always will be retrieved Testing the applicationNow that we know how the application works a controller test will be performed where we will use MockMVC MockMvc simulates a real request to the application doing exactly what happens when the client calls an endpoint This implies that at the time of running the tests we need to have all external resources working It is common for projects to use a real test specific database instance to perform integration tests however as we saw earlier we have a more elegant and modern way to do them using TestContainers As the cached service method and the repository will be called in the controller flow it will be necessary to upload two containers one for MySQL and the other for Redis Let s start developing our test The first thing we need to do is add the TestContainers dependencies to the application s pom xml lt dependencyManagement gt lt dependencies gt lt dependency gt lt groupId gt org testcontainers lt groupId gt lt artifactId gt testcontainers bom lt artifactId gt lt version gt testcontainers version lt version gt lt type gt pom lt type gt lt scope gt import lt scope gt lt dependency gt lt dependencies gt lt dependencyManagement gt lt dependencies gt lt dependency gt lt groupId gt org testcontainers lt groupId gt lt artifactId gt junit jupiter lt artifactId gt lt scope gt test lt scope gt lt dependency gt lt dependency gt lt groupId gt org testcontainers lt groupId gt lt artifactId gt mysql lt artifactId gt lt scope gt test lt scope gt lt dependency gt We need the TestContainers junit jupiter dependency because it provides some resources for more efficient testing As we are using MySQL as a database it s necessary a dependency that provides resources to create a MySQL container for tests in a simplified way We need to create the configuration class of the containers that will be created at test time It will be called DatabaseContainerConfiguration and will have the following content SpringBootTest webEnvironment SpringBootTest WebEnvironment RANDOM PORT abstract class DatabaseContainerConfiguration companion object Container private val mysqlContainer MySQLContainer lt Nothing gt mysql latest apply withDatabaseName testdb withUsername joao withPassword Container private val redisContainer GenericContainer lt Nothing gt redis latest apply withExposedPorts JvmStatic DynamicPropertySource fun properties registry DynamicPropertyRegistry registry add spring datasource url mysqlContainer getJdbcUrl registry add spring datasource password mysqlContainer getPassword registry add spring datasource username mysqlContainer getUsername registry add spring redis host redisContainer getContainerIpAddress registry add spring redis port redisContainer getFirstMappedPort Now let s break down the meaning of each of the above features Container is used in conjunction with the Testcontainers annotation to mark containers that should be managed by the Testcontainers extension We ll see about the TestContainers annotation yetMySQLContainer lt Nothing gt Class that supports the creation of a MySQL container for testing We passed a Nothing in the generics of MySQLContainer because of the class signature public class MySQLContainer lt SELF extends MySQLContainer lt SELF gt gt extends JdbcDatabaseContainer lt SELF gt as we can see there is a recursive generic type which with Java we can ignore and just instantiate the class without generics Using Kotlin we don t have this option but we have two ways to handle it Define a subclass of MySQLContainer and pass the child class to genericsUse Nothing which by Kotlin doc s is Nothing has no instances You can use Nothing to represent a value that never exists for example if a function has the return type of Nothing it means that it never returns In the MySQLContainer constructor the version that we want to use from the MySQL image is informed withDatabaseName Method of the MySQLContainer class that receives the name of the database as a parameter This database will be created at runtime after the test container goes up withUsername Method of the MySQLContainer class that receives the database username as a parameter withPassword Method of the MySQLContainer class that receives the password from the database as a parameter GenericContainer lt Nothing gt As the name implies it is a class that allows you to create a container in a generic way which means that the methods contained in them can be reused for various resources such as Redis NoSQL Databases among others We are using it because Redis does not have a specific class like MySQL As we are seeing in the code to create a generic container we just need to insert the image of the resource that we want to instantiate as a parameter withExposedPorts Method of the GenericContainer class that receives the port that we will make available from the test container This port will be used at runtime The properties function is used to dynamically add Redis and MySQL properties to the application Before TestContainers uploads the two containers the application will not be aware of them so how would we carry out the integration tests Using DynamicPropertySource Kotlin understands that these properties will be dynamically set at runtime so when uploading the MySQL and Redis container the information that the application needs to know to reach them will be included Now we have everything we need for TestContainers to upload both containers We just need to use the class where needed As stated at the beginning of the section we want to do an API test where MockMVC will make a request to the controller and thus follow the flow to the database So let s create this test Testcontainers AutoConfigureMockMvc SpringBootTest webEnvironment SpringBootTest WebEnvironment RANDOM PORT class CarControllerTest DatabaseContainerConfiguration Autowired private lateinit var mockMvc MockMvc companion object private const val URI cars Test fun should return code when call cars mockMvc get URI andExpect status isOk As mentioned before we can see that we have an annotation in the class declaration which is TestContainers This annotation makes that at runtime the library identifies it and uploads the available containers through the Container annotation which is in our DatabaseContainerConfiguration class which in turn was inherited by the test This is enough for when we run the tests the containers are instantiated The intention is not to talk about MockMVC but according to the documentation it is the main entry point for server side Spring MVC testing support One last detail before running the tests is that it will be necessary to configure the migration When the application goes up and reaches the containers it is applied src main resources db migration V create car table add data sqlcreate table car id bigint not null auto increment name varchar not null model varchar not null primary key id insert into car values Golf VW It s time to run the tests and remember docker must be active Running the mvn B test command will run the tests We can observe the containers going up at the time of the test execution using the docker ps command in the terminal or the docker desktop In the test execution logs we can see the moment when the MySQL container rises main DEBUG mysql latest Trying to create JDBC connection using com mysql cj jdbc Driver to jdbc mysql localhost testdb useSSL false amp allowPublicKeyRetrieval true with properties password user joao main INFO mysql latest Container is started JDBC URL jdbc mysql localhost testdb main INFO mysql latest Container mysql latest started in PTSJust like Redis main DEBUG redis latest Starting container redis latest main DEBUG redis latest Trying to start container redis latest attempt main DEBUG redis latest Starting container redis latest main INFO redis latest Creating container for image redis latestAnd finally the expected resultTests Passed of test ms ConclusionIntegration tests are very important for the application and one of the main tasks is to validate if the application s connection with external resources is being done successfully There are N ways to do them We can use database integration tests in memory databases real instances and as presented in the post TestContainers TestContainers with small settings bring big advantages Disposable containers as they are only used at the time of test execution External resource agnostic with the GenericContainer class we can do integration testing with any resource we uploaded in docker An excellent testing tool Application s repository References	2022-07-07 13:01:32
Apple	AppleInsider - Frontpage News	How to use Apple's ultra-secure Lockdown Mode and when you would want to	https://appleinsider.com/inside/ios-16/tips/how-to-use-apples-ultra-secure-lockdown-mode-and-when-you-would-want-to?utm_medium=rss	How to use Apple x s ultra secure Lockdown Mode and when you would want toLockdown Mode may sound like a great way to protect your device and data but it isn t for everyday use Here s how to activate it and when Lockdown Mode enhances iPhone security well beyond what regular users needApple wants to improve device security for high profile individuals that may be targeted by sophisticated cyberattacks with a new mode in iOS iPadOS and macOS Ventura However this mode is very restrictive and will limit the device s functionality Read more	2022-07-07 13:56:57
Apple	AppleInsider - Frontpage News	Daily deals July 7: $24 Spigen MagSafe Battery Pack, $20 off 10.2-inch iPad, 20% discount on AirPods Pro, more	https://appleinsider.com/articles/22/07/07/daily-deals-july-7-24-spigen-magsafe-battery-pack-20-off-102-inch-ipad-20-discount-on-airpods-pro-more?utm_medium=rss	Daily deals July Spigen MagSafe Battery Pack off inch iPad discount on AirPods Pro moreThursday s best deals include off a inch Toshiba K TV for Prime members off AirPods Max for a Sophie in charging mat and much more Best deals July AppleInsider checks online stores daily to uncover discounts and offers on hardware and other products including Apple devices smart TVs accessories and other items The best offers are compiled into our regular list for our readers to use and save money Read more	2022-07-07 13:07:48
海外TECH	Engadget	‘Star Trek: Strange New Worlds’ cements its first season with a strong finale	https://www.engadget.com/star-trek-strange-new-worlds-110-a-quality-of-mercy-review-130037849.html?src=rss	Star Trek Strange New Worlds cements its first season with a strong finaleThe following article contains really significant spoilers for A Quality of Mercy We re living in the age of the prequel with studios exploiting every scrap of existing material where there s an audience already in place to enjoy it But the low hanging fruit and easy cash a prequel promises severely limits the storytelling opportunities for those properties Obi Wan Kenobi can t die or do anything of consequence during his own prestige miniseries since his fate was preordained in Ewan McGregor has to age into Sir Alec Guinness and die at Darth Vader s hand and that s that Sure there are some things creative teams can play fast and loose with but the big things the ones that permeate the culture at large are set in stone Ever since Star Trek Strange New Worlds was announced it was blighted by this same hard stop one dictated back in November Movies aside until Christopher Pike was little more than a pub trivia answer to the question “Who was the first captain of the Enterprise It ll provoke an argument between the folks who just about remember Jeffrey Hunter was there before William Shatner while the folks who know Robert April was first sit smugly on the sidelines But Pike s fate wasn t necessarily immutable until the second season of Discovery reaffirmed that he was going to get his radiation dose But that didn t matter until the fans production team and executives found that they liked Anson Mount and could easily watch a whole series of pre Kirk adventures with him on the Enterprise I wouldn t have been surprised if the creative team looked for a way to prolong the series beyond its narrative end point The show has already dangled a few ways that Pike could survive the incident and made it clear that there are still seven years left to go Seven years being the old fashioned point where a TV show could make it in syndication and the duration that all three Silver Age Trek series reached Strange New Worlds could just as easily slow its timeline down and spend five seven ten or seventeen seasons filling the next six years of Pike s life or find a way to remove such an arbitrary deadline And yet the show s season finale “A Quality of Mercy decides to take advantage of the limits imposed upon it making it clear to both Pike and us that there are no get outs We begin at a base on the edge of the Romulan neutral zone where the son of Commander Hansen will when he grows up be one of the cadets who dies in the radiation leak Pike decides that it s only logical to dissuade the kid from joining Starfleet and therefore save his life but as he s writing a letter to the boy to warn him of his fate an older Pike appears in his quarters And we know he s older because he s wearing one of Robert Fletcher s gorgeous era Starfleet uniforms albeit restyled to suit the nu Trek era Sadly Admiral Pike isn t here to congratulate his younger self on a job well done but warn him of the consequences of futzing with time Thanks to a Klingon Time Crystal from Boreth Pike gets All Good Things ed into his own future six months after the radiation leak If your fan antennae started tingling at the date it s because Pike is running the Enterprise in during the first season of classic Star Trek In fact it s worse than that because he s been thrust straight into the episode of “Balance of Terror except he has to win the way his way instead of Kirk s As Pike says the only way to discover why this future is terrible is to live it “Balance of Terror nbsp is widely regarded to be one of the top three best episodes from the classic series It s the one where the Enterprise plays a tense game of cat and mouse with a new Romulan warbird equipped with a cloaking device and a powerful weapon capable of shredding starships in one shot Now if there s one thing this episode does better than well most of nu Trek it s the fact that all of the characters make smart choices Pike thrown into the future instantly confides in Spock and when he s met with resistance immediately recommends a mind meld Caught up to speed Spock becomes Pike s co confidant in the altered future helping him to work out what exactly he needs to do here Pike s survival has caused plenty of things to change in the timeline James Kirk is the captain of the USS Farragut which has survived in this version of the future And mercifully the ship is in the vicinity meaning that Kirk and Pike get to work together to solve the problem of the rogue Romulan Warbird with its devastating new weapon Meanwhile the beats from “Balance of Terror get replayed with Ortegas replacing Lt Stiles as the on bridge racist with angry eyes pointed at Spock Understandably given the conflicts between Pike s folksy diplomacy and Kirk s more action y approach nobody wins The Romulans get a signal out to the fleet who realize that the Federation is weak enough to wage total war upon In many ways this episode serves up its own indictment of Pike showing that his don t shoot first approach has a limit And it also puts some clearer water between Pike and Kirk since one was the replacement for the other back in the s Naturally the episode ends with Pike opting to return to his own time and understand that he can t simply back out of his preordained fate This is the second episode of Strange New Worlds co written by the polarizing Akiva Goldsman and many of his hallmarks are on full show here There s the misplaced reverence for franchise iconography Great Man Of History mythologizing this time with Spock and a face off between two copy and paste CGI space fleets Even so given the risk of what this episode could have been especially threading a new narrative through one of the sacred texts of the original series this worked pretty well Given Goldsman s previous Trek work I m giving all of the credit to showrunner and co writer Henry Alonso Myers here I can t really give much comment on Paul Wesley s performance as Kirk here since he s handed the most poisoned of chalices William Shatner even at his worst never played Kirk as big as the stereotype has become and Chris Pine s performance dialed down Kirk s bookish warrior poet side Go too far on either side and it ll become an impression especially since he s only got around minutes of screentime in the whole episode That s why he essentially plays Kirk as someone who is both stalwart but also endlessly looking for a third option emphasizing his inventiveness The episode ends with a twist somehow Number One s past has been revealed like when she just told everyone who would listen in quot Ghosts of Illyria quot and she s arrested by Starfleet Pike nearly breaks a security guard s hand preventing the arrest but is talked down by Una on the pad before he declares that things aren t over I ll be very curious to see how this particular storyline gets resolved especially considering my perpetual wondering about Rebecca Romijn s absence from the show The fact that Paul Wesley was tipped to recur in season two might suggest Kirk s coming on board as her replacement but that feels a bit too excessive in its fan service nbsp Fundamentally however Strange New Worlds wraps up its first season with something that s better than it had any right to be As I wrote back at the beginning the first five episodes all have something good going on but often trip over their own shoelaces Ever since “Spock Amok however the show has started to find its feet with less awkward dialogue a more relaxed groove and the courage to go for high camp and comedy just as regularly as it does high drama Every episode in the back half of the first season has been better than its immediate predecessor even if there s some very obvious kinks that still need to be worked out Whisper it friends but Strange New Worlds might actually be good	2022-07-07 13:00:37
海外TECH	CodeProject Latest Articles	Porting a Large Project from Windows to Linux	https://www.codeproject.com/Articles/5336369/Porting-a-Large-Project-from-Windows-to-Linux	compilers	2022-07-07 13:23:00
海外科学	NYT > Science	Fields Medals in Mathematics Won by Four Under Age 40	https://www.nytimes.com/live/2022/07/05/science/fields-medal-math	complex	2022-07-07 13:24:51
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