投稿時間:2023-08-08 18:16:00 RSSフィード2023-08-08 18:00 分まとめ(21件)

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IT	ITmedia 総合記事一覧	[ITmedia News] 台風7号発生　その名も「LAN」　由来はローカルエリア……ではない	https://www.itmedia.co.jp/news/articles/2308/08/news155.html	itmedia	2023-08-08 17:39:00
AWS	AWS Japan Blog	新規開設 – AWS イスラエル (テルアビブ) リージョン	https://aws.amazon.com/jp/blogs/news/now-open-aws-israel-tel-aviv-region/	利用可能	2023-08-08 08:47:06
Docker	dockerタグが付けられた新着投稿 - Qiita	AtCoder の環境を Docker で作りたい	https://qiita.com/tf63/items/c93c6f24d73599e637d8	atcoder	2023-08-08 17:57:06
Docker	dockerタグが付けられた新着投稿 - Qiita	Spring Boot × PostgreSQL × Docker(Compose V2)でお手軽環境構築	https://qiita.com/Keichan_15/items/7ec1e8d417e273143c34	docker	2023-08-08 17:54:12
技術ブログ	Developers.IO	Security Hub Automation Rules でコントロールを指定する際は「統合されたコントロールの検出結果」を意識しておくと良さそうな話	https://dev.classmethod.jp/articles/security-hub-automation-rules-consolidated-control/	ecurityhubautomationrules	2023-08-08 08:16:51
海外TECH	DEV Community	Understanding The Event Loop in NodeJs Easily.	https://dev.to/sarahokolo/understanding-the-event-loop-in-nodejs-easily-399m	Understanding The Event Loop in NodeJs Easily IntroductionAt some point in time you might have asked yourself how exactly does the callback order of operations actually work Like if you have a piece of asynchronous code that calls callback functions at the exact same time how does the runtime pick what callback to actually execute first Well this is because the node runtime follows an already predefined order of operations known as the Event Loop In this article we are going to understand all about what the event loop is and why it is a very important concept to know about to better understand the execution process of you code Let s get started What Is the Event Loop The Event Loop is a continuous running process that coordinates the operation of executions for asynchronous tasks in nodejs The loop is only alive when your nodejs application is running When a nodejs project starts up so does the event loop You can think of it as a customer care representative When the day starts the customer care rep sits at their desk waiting for a call to be made When the call is made they pick up their phone and listen to the request that is being made after that they execute whatever request was made When that is done they end the call and listen for a new incoming call This loop goes on and on till the day ends or in our case till the application closes Now that we understand how the loop works let s take a look at each of the process the loop goes through when running In each iteration of the loop It encounters different queues namely the Microtask QueueTimer QueueI O QueueCheck QueueClose QueueEach queue holds one or more callback functions that would be eventually executed on the call stack Now you might be thinking that these are just queues mentioned that is because the Microtask queue consists of two queues The nextTick queue and the promise queue Let us take an in depth look at each of the queues and how the event loop iterates through all of them Microtask QueueLike mentioned previously the microtask queue isn t just a single queue but a queue that consist of extra queues nextTick queueCallbacks in this queue are registered as higher priority over all other callbacks in the event loop This tells the loop to leave original flow of the iteration to execute whatever callback is present in this queue before going back to continue the execution of other callbacks from where it left off You can register a call back in the nextTick queue using the process nextTick cb function where cb represents the callback to be registered promise queueThis queue is quite similar to the nextTick queue in the sense that the loop also break out from its initial flow to execute any available callback in the queue A callback can be registered in this queue by using promise based asynchronous operations like promise resolve or promise reject with its associated then or catch handler Timer QueueTo queue a callback into the timer queue we make use of either the setTimeout callback ms or setInterval callback ms function Callbacks in the microtask queue are executed in between the execution of a callbacks in the timer queue meaning if along the lines of the callbacks in the timer queue being executed a callback is then added to the microtask queue the execution leaves the timer queue to go attend to the callbacks in the microtask queue before then going back to continue the execution of callbacks in the timer queue I O QueueThis queue consist of callbacks from operations with the file system like reading and writing to a file or making an API call These callbacks typically involves the use of the async fs and http modules while the event loop is in this queue it comes across a poll phase In this phase the loop checks for new I O events like reading from a file or receiving data from a network socket If there are no pending I O events at the moment the event loop will remain idle in this phase or move on to execute callbacks in the next queueCheck QueueThis queue consists of any pending callbacks The check queue is a separate queue that holds callbacks registered by setImmediate function This is a function provided by nodejs that allows you to register a callback function to be executed asynchronously in the Check phase of the event loop It is used to schedule callbacks that need to be executed right after the current phase without waiting for other I O events to be handled Close QueueThis queue is used to store any callbacks registered with resources that have been closed When a resource in nodejs is closed by calling the close method a close event is emitted When this event is emitted any callback functions that were registered for that resource are added to the close callback queue and are to only be executed when the loop gets to the close queue section Summary of the entire iteration process️The loop first starts off running the micro tasks queue first which consists of the nextTick queue which would be executed first above all process nextTick and then the promise queue promise resolve promise reject After every callback has been executed here ️All callbacks within the timer queue setInterval setTimeout gets executed ️Then again all callbacks in the microtask queue if any gets executed ️Next all callbacks within the I O queue async fs and http module callbacks are executed ️The loop then checks again to see if any new callback has been added to the microtask queue and if any they get executed ️Next all callbacks within the Check queue setImmediate callbacks are executed ️For the final time in the current iteration all callbacks in the microtask queue if any gets executed ️Next all callbacks in the Close queue callbacks associated with the close event of an async task are executed If there are more callbacks to be processed in any of the queues the loop takes another iteration and the same steps are repeated from top to bottom ConclusionNow that we have understood perfectly well what the event loop is all about and the processes it encounters in each iteration here are are a few things overall that you must have in mind The nextTick callbacks would always be executed before the promise callbacks nextTick and promise callbacks are always executed inbetween each queue and also inbetween each callback execution in the timer and check queues Using process nextTick a lot in your code is highly discouraged as it can starve the execution of the rest of the callbacks in the event loop In nodejs all user written synchronous code takes priority over any async code Well that is all for this article guys I hope you have been able to learn one or two from all I ve said so far If you have any questions please do not hesitate to ask in the comment section below I would be more than happy to provide answers to them Till then	2023-08-08 08:46:58
金融	ニッセイ基礎研究所	ASEANの貿易統計（８月号）～６月の輸出は中国向けが改善も、域内向けが落ち込み前年割れ続く	https://www.nli-research.co.jp/topics_detail1/id=75744?site=nli	輸出を品目別にみると、輸出全体の約割を占める電話機・同部品が前年同月比減前月同減、コンピュータ、電子製品・同部品が同減前月同減となり、それぞれ減少幅が縮小した図表。	2023-08-08 17:46:16
ニュース	BBC News - Home	Shops offering discounts to tempt hard-hit customers	https://www.bbc.co.uk/news/business-66429307?at_medium=RSS&at_campaign=KARANGA	customerswet	2023-08-08 08:08:04
ニュース	BBC News - Home	Suella Braverman to target 'crooked' immigration lawyers	https://www.bbc.co.uk/news/uk-politics-66437588?at_medium=RSS&at_campaign=KARANGA	asylum	2023-08-08 08:53:00
ニュース	BBC News - Home	Bryan Randall: Sandra Bullock's long-term partner dies aged 57	https://www.bbc.co.uk/news/entertainment-arts-66437720?at_medium=RSS&at_campaign=KARANGA	final	2023-08-08 08:37:16
ニュース	BBC News - Home	Andrew Malkinson: Justice secretary looking into three jail cost cases	https://www.bbc.co.uk/news/uk-england-manchester-66437396?at_medium=RSS&at_campaign=KARANGA	andrew	2023-08-08 08:32:25
ニュース	BBC News - Home	China exports see biggest drop for three years	https://www.bbc.co.uk/news/business-66436582?at_medium=RSS&at_campaign=KARANGA	interest	2023-08-08 08:39:53
ニュース	BBC News - Home	Three climbers found dead in Glen Coe	https://www.bbc.co.uk/news/uk-scotland-66427686?at_medium=RSS&at_campaign=KARANGA	aonach	2023-08-08 08:44:48
IT	週刊アスキー	Digital×北斎展のグッズショップにて新オリジナル商品を販売開始	https://weekly.ascii.jp/elem/000/004/149/4149068/	digital	2023-08-08 17:45:00
IT	週刊アスキー	『ウマ娘』レジェンドレース「スマートファルコン」が8月9日より開催決定！	https://weekly.ascii.jp/elem/000/004/149/4149100/	cygames	2023-08-08 17:40:00
IT	週刊アスキー	最大90％オフ！D3PがSteamストアで「D3PUBLISHER サマーセール」を開催中	https://weekly.ascii.jp/elem/000/004/149/4149097/	dogenzakalab	2023-08-08 17:20:00
IT	週刊アスキー	「ポケモンプレゼンツ」が今夜8月8日22時から公開！	https://weekly.ascii.jp/elem/000/004/149/4149072/	youtube	2023-08-08 17:10:00
IT	週刊アスキー	アドビ、「バックオフィス業務のデジタル化に関する調査」の結果発表	https://weekly.ascii.jp/elem/000/004/149/4149069/	結果発表	2023-08-08 17:45:00
IT	週刊アスキー	ヤフーのビッグデータ分析で急上昇トレンド可視化「DS.INSIGHT Trend」提供開始	https://weekly.ascii.jp/elem/000/004/149/4149070/	提供開始	2023-08-08 17:30:00
ニュース	THE BRIDGE	中国、顔認識の使用を「特定の目的」に限定	https://thebridge.jp/2023/08/chinas-draft-measures-demand-individual-consent-for-facial-recognition-use-pickupnews	中国、顔認識の使用を「特定の目的」に限定ピックアップChinasdraftmeasuresdemandindividualconsentforfacialrecognitionuseサマリーTechCrunchが中国サイバースペース管理局CyberspaceAdministrationofChina・CACにおいて公表された顔認識の適用を規制するための一連の措置について報じている。	2023-08-08 08:30:33
ニュース	THE BRIDGE	山火事に特化したVC「Convective Capital」にみるファイアテック・ソリューション	https://thebridge.jp/2023/08/pano-ai-the-leader-in-wildfire-detection-technology-raises-17m-in-growth-capital-pickupnews	山火事に特化したVC「ConvectiveCapital」にみるファイアテック・ソリューションニュースサマリ月、山火事のアクティブ検出ソリューションを提供するPanoAIは、ValorEquityPartnersをリードとする投資ラウンドで万ドルを調達した。	2023-08-08 08:00:49