{"id":95403,"date":"2020-09-28T19:43:15","date_gmt":"2020-09-28T17:43:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/vybor-arhitekturnogo-stilya-chast-3"},"modified":"2020-09-28T19:43:15","modified_gmt":"2020-09-28T17:43:15","slug":"vybor-arhitekturnogo-stilya-chast-3","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/vybor-arhitekturnogo-stilya-chast-3","title":{"rendered":"V\u00fdb\u011br architektonick\u00e9ho stylu (\u010d\u00e1st 3)","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><b><i>Ahoj, Habr. Dnes pokra\u010duji v s\u00e9rii publikac\u00ed, kterou jsem napsal speci\u00e1ln\u011b k zah\u00e1jen\u00ed nov\u00e9ho b\u011bhu kurzu <noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/z0Ur\/\">\u201eSoftware Architect\u201c<\/a><\/noindex>.<\/i><\/b><\/p>\n<p><\/p>\n<h2>\u00davod<\/h2>\n<p>\nVolba architektonick\u00e9ho stylu je jedn\u00edm z kl\u00ed\u010dov\u00fdch technick\u00fdch rozhodnut\u00ed p\u0159i vytv\u00e1\u0159en\u00ed informa\u010dn\u00edho syst\u00e9mu. V t\u00e9to s\u00e9rii \u010dl\u00e1nk\u016f se pokus\u00edm prozkoumat nejpopul\u00e1rn\u011bj\u0161\u00ed architektonick\u00e9 styly pro v\u00fdstavbu aplikac\u00ed a odpov\u011bd\u011bt na ot\u00e1zku, kdy je jak\u00fd architektonick\u00fd styl nejvhodn\u011bj\u0161\u00ed. B\u011bhem vypr\u00e1v\u011bn\u00ed se pokus\u00edm prov\u00e9st logickou linii, kter\u00e1 vysv\u011btluje v\u00fdvoj architektonick\u00fdch styl\u016f od monolit\u016f po mikroservisy. <\/p>\n<p>Minule jsme hovo\u0159ili o r\u016fzn\u00fdch typech monolit\u016f a o pou\u017e\u00edv\u00e1n\u00ed komponent\u016f pro jejich stavbu, jak komponent\u016f sestaven\u00ed, tak komponent\u016f nasazen\u00ed. Zjistili jsme, co je to architektura orientovan\u00e1 na slu\u017eby.<\/p>\n<p>Nyn\u00ed kone\u010dn\u011b definujeme hlavn\u00ed charakteristiky mikroservisn\u00ed architektury. <br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Vztah architektur<\/h2>\n<p>\nJe t\u0159eba ch\u00e1pat, \u017ee na z\u00e1klad\u011b p\u0159edchoz\u00edch definic je jak\u00e1koliv slu\u017eba komponentou, ale ne ka\u017ed\u00e1 slu\u017eba je mikroservis. <\/p>\n<h2>Charakteristiky mikroservisn\u00ed architektury<\/h2>\n<p>\nHlavn\u00edmi charakteristikami mikroservisn\u00ed architektury jsou:<\/p>\n<ul>\n<li>Organizace podle obchodn\u00edch schopnost\u00ed (Organized around Business Capabilities)<\/li>\n<li>Produkty, ne projekty (Products not Projects)<\/li>\n<li>Inteligentn\u00ed vstupy a hloup\u00e9 kan\u00e1ly (Smart endpoints and dumb pipes)<\/li>\n<li>Decentralizovan\u00e9 \u0159\u00edzen\u00ed (Decentralized Governance)<\/li>\n<li>Decentralizovan\u00e9 \u0159\u00edzen\u00ed dat (Decentralized Data Management)<\/li>\n<li>Automatizace infrastruktury (Infrastructure Automation)<\/li>\n<li>Pojistka proti selh\u00e1n\u00ed (Design for failure)<\/li>\n<li>Architektura s evolu\u010dn\u00edm v\u00fdvojem (Evolutionary Design)<\/li>\n<\/ul>\n<p>\n1. bod vych\u00e1z\u00ed ze slu\u017eby orientovan\u00e9 na slu\u017eby, proto\u017ee mikroservisy jsou zvl\u00e1\u0161tn\u00edm p\u0159\u00edpadem slu\u017eeb. Ostatn\u00ed body si zaslou\u017e\u00ed samostatn\u00e9 projedn\u00e1n\u00ed.<\/p>\n<h2>Organizace podle obchodn\u00edch schopnost\u00ed (Organized around Business Capabilities)<\/h2>\n<p>\nNyn\u00ed je nutn\u00e9 si p\u0159ipomenout Conway\u016fv z\u00e1kon: organizace vytv\u00e1\u0159ej\u00edc\u00ed syst\u00e9my organizuj\u00ed jejich architekturu, kter\u00e1 kop\u00edruje strukturu interakce uvnit\u0159 t\u011bchto organizac\u00ed. Jako p\u0159\u00edklad si m\u016f\u017eeme vzpomenout na p\u0159\u00edpad v\u00fdvoje kompil\u00e1toru: t\u00fdm sedmi lid\u00ed vyvinul sedmiprasov\u00fd kompil\u00e1tor, zat\u00edmco t\u00fdm p\u011bti lid\u00ed \u2014 p\u011btiprasov\u00fd.<\/p>\n<p>Pokud hovo\u0159\u00edme o monolitech a mikroslu\u017eb\u00e1ch, v p\u0159\u00edpad\u011b, \u017ee je v\u00fdvoj organizov\u00e1n podle funk\u010dn\u00edch odd\u011blen\u00ed (backend, frontend, administrace datab\u00e1z\u00ed), vznik\u00e1 klasick\u00fd monolit. <\/p>\n<p>Pro z\u00edsk\u00e1n\u00ed mikroslu\u017eeb je nutn\u00e9 organizovat t\u00fdmy podle obchodn\u00edch p\u0159\u00edle\u017eitost\u00ed (t\u00fdm objedn\u00e1vek, expedice, katalog). Takov\u00e1 organizace umo\u017en\u00ed t\u00fdm\u016fm soust\u0159edit se na vytv\u00e1\u0159en\u00ed konkr\u00e9tn\u00edch \u010d\u00e1st\u00ed aplikace.<\/p>\n<h2>Produkty, ne projekty (Products not Projects)<\/h2>\n<p>\nProjektov\u00fd p\u0159\u00edstup, kdy t\u00fdm p\u0159ed\u00e1v\u00e1 vyvinutou funkcionalitu jin\u00fdm t\u00fdm\u016fm v p\u0159\u00edpad\u011b mikroslu\u017ebov\u00e9 architektury, se zcela nehod\u00ed. T\u00fdm by m\u011bl podporovat syst\u00e9m po celou dobu jeho \u017eivotn\u00edho cyklu. Spole\u010dnost Amazon, jedna z pr\u016fkopnic zav\u00e1d\u011bn\u00ed mikroslu\u017eeb, prohla\u0161ovala: \u201evytv\u00e1\u0159\u00edte produkt, a vy ho tak\u00e9 spou\u0161t\u00edte\u201c (\u201eyou build, you run it\u201c). Produktov\u00fd p\u0159\u00edstup umo\u017e\u0148uje t\u00fdmu poc\u00edtit pot\u0159eby podnik\u00e1n\u00ed. <\/p>\n<h2>Inteligentn\u00ed vstupy a hloup\u00e9 kan\u00e1ly (Smart endpoints and dumb pipes)<\/h2>\n<p>\nArchitektura SOA v\u011bnovala velkou pozornost komunika\u010dn\u00edm kan\u00e1l\u016fm, zejm\u00e9na Enterprise Service Bus (slu\u017eebn\u00ed sb\u011brnici podniku). Co\u017e \u010dasto vede k Erroneous Spaghetti Box, tedy slo\u017eitost monolitu se p\u0159en\u00e1\u0161\u00ed do slo\u017eitosti vztah\u016f mezi slu\u017ebami. V mikroslu\u017ebov\u00e9 architektu\u0159e jsou pou\u017e\u00edv\u00e1ny pouze jednoduch\u00e9 zp\u016fsoby interakce.<\/p>\n<h2>Decentralizovan\u00e9 \u0159\u00edzen\u00ed (Decentralized Governance)<\/h2>\n<p>\nKl\u00ed\u010dov\u00e1 rozhodnut\u00ed ohledn\u011b mikroslu\u017eeb by m\u011bli p\u0159ij\u00edmat lid\u00e9, kte\u0159\u00ed skute\u010dn\u011b vyv\u00edjej\u00ed mikroslu\u017eby. Zde se pod kl\u00ed\u010dov\u00fdmi rozhodnut\u00edmi rozum\u00ed volba<br \/>\nprogramovac\u00edch jazyk\u016f, metodologie nasazen\u00ed, kontrakt\u016f ve\u0159ejn\u00fdch rozhran\u00ed atd. <\/p>\n<h2>Decentralizovan\u00e9 \u0159\u00edzen\u00ed dat (Decentralized Data Management)<\/h2>\n<p>\nStandardn\u00ed p\u0159\u00edstup, kdy aplikace spol\u00e9h\u00e1 na jednu datab\u00e1zi, nem\u016f\u017ee zohlednit specifika ka\u017ed\u00e9 jednotliv\u00e9 slu\u017eby. MSA p\u0159edpokl\u00e1d\u00e1 decentralizovan\u00e9 \u0159\u00edzen\u00ed dat, a\u017e po pou\u017eit\u00ed r\u016fzn\u00fdch technologi\u00ed.<\/p>\n<h2>Automatizace infrastruktury (Infrastructure Automation)<\/h2>\n<p>\nMSA podporuje procesy kontinu\u00e1ln\u00edho nasazen\u00ed a dod\u00e1v\u00e1n\u00ed. Toho lze dos\u00e1hnout pouze automatizac\u00ed proces\u016f. P\u0159itom nasazen\u00ed velk\u00e9ho mno\u017estv\u00ed slu\u017eeb u\u017e nevypad\u00e1 jako n\u011bco hrozn\u00e9ho. Proces nasazen\u00ed by se m\u011bl st\u00e1t nudn\u00fdm. Druh\u00fd aspekt se t\u00fdk\u00e1 \u0159\u00edzen\u00ed slu\u017eeb v produk\u010dn\u00edm prost\u0159ed\u00ed. Bez automatizace se \u0159\u00edzen\u00ed proces\u016f spu\u0161t\u011bn\u00fdch v r\u016fzn\u00fdch opera\u010dn\u00edch prost\u0159ed\u00edch st\u00e1v\u00e1 nemo\u017en\u00fdm.<\/p>\n<h2>Pojistka proti selh\u00e1n\u00ed (Design for failure)<\/h2>\n<p>\nMnoh\u00e9 slu\u017eby MSA jsou n\u00e1chyln\u00e9 k chyb\u00e1m. Zpracov\u00e1n\u00ed chyb v distribuovan\u00fdch syst\u00e9mech je v\u0161ak velmi netrivi\u00e1ln\u00ed \u00fakol. Architektura aplikac\u00ed by m\u011bla b\u00fdt odoln\u00e1 v\u016f\u010di t\u011bmto chyb\u00e1m. Rebecca Parsons pova\u017euje za velmi d\u016fle\u017eit\u00e9, abychom ji\u017e nepou\u017e\u00edvali ani meziprocesovou komunikaci mezi slu\u017ebami; m\u00edsto toho se pro komunikaci uchylujeme k HTTP, kter\u00e9 nen\u00ed zdaleka tak spolehliv\u00e9.<\/p>\n<h2>Architektura s evolu\u010dn\u00edm v\u00fdvojem (Evolutionary Design)<\/h2>\n<p>\nArchitektura syst\u00e9mu MSA by m\u011bla vyv\u00edjet evolu\u010dn\u011b. Je vhodn\u00e9 omezit nezbytn\u00e9 zm\u011bny hranicemi jedn\u00e9 slu\u017eby. Je tak\u00e9 nutn\u00e9 vz\u00edt v \u00favahu vliv na ostatn\u00ed slu\u017eby. Tradi\u010dn\u00ed p\u0159\u00edstup spo\u010d\u00edv\u00e1 v pokusu o \u0159e\u0161en\u00ed tohoto probl\u00e9mu pomoc\u00ed \u0159\u00edzen\u00ed verz\u00ed, ale MSA znamen\u00e1 pou\u017e\u00edvat \u0159\u00edzen\u00ed verz\u00ed jako<br \/>\nposledn\u00ed mo\u017enost.<\/p>\n<h2>Z\u00e1v\u011br<\/h2>\n<p>\nPo v\u0161ech v\u00fd\u0161e zm\u00edn\u011bn\u00fdch skute\u010dnostech lze formulovat, co jsou mikroservisy. Mikroservisn\u00ed architektura je p\u0159\u00edstup k v\u00fdvoji jednotliv\u00e9 aplikace jako sada mal\u00fdch slu\u017eeb, z nich\u017e ka\u017ed\u00e1 pracuje ve sv\u00e9m vlastn\u00edm procesu a vz\u00e1jemn\u011b interaguje pomoc\u00ed zjednodu\u0161en\u00fdch mechanism\u016f, \u010dasto prost\u0159ednictv\u00edm API rozhran\u00ed HTTP zdroj\u016f. Tyto slu\u017eby jsou postaveny na obchodn\u00edch mo\u017enostech a mohou b\u00fdt nasazeny nez\u00e1visle pomoc\u00ed zcela<br \/>\nautomatizovan\u00e9ho mechanismu nasazen\u00ed. Existuje minim\u00e1ln\u00ed \u00farove\u0148 centralizovan\u00e9ho \u0159\u00edzen\u00ed t\u011bchto slu\u017eeb, kter\u00e9 mohou b\u00fdt naps\u00e1ny v r\u016fzn\u00fdch programovac\u00edch jazyc\u00edch a pou\u017e\u00edvat r\u016fzn\u00e9 technologie ukl\u00e1d\u00e1n\u00ed dat.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/z0Ur\/\"><img decoding=\"async\" alt=\"V\u00fdb\u011br architektonick\u00e9ho stylu (\u010d\u00e1st 3)\" src=\"\/wp-content\/uploads\/2020\/09\/f9ffd06c83921f64818842327c09108e.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p><i><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/otus\/blog\/519456\/\">\u010c\u00edst \u010d\u00e1st 2<\/a><\/noindex><\/i><br \/>\n<br \/>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/otus\/blog\/520870\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440. \u0421\u0435\u0433\u043e\u0434\u043d\u044f \u044f \u043f\u0440\u043e\u0434\u043e\u043b\u0436\u0430\u044e \u0441\u0435\u0440\u0438\u044e \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0439, \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043d\u0430\u043f\u0438\u0441\u0430\u043b \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e \u043a \u0441\u0442\u0430\u0440\u0442\u0443 \u043d\u043e\u0432\u043e\u0433\u043e \u043f\u043e\u0442\u043e\u043a\u0430 \u043a\u0443\u0440\u0441\u0430 \u00abSoftware Architect\u00bb. \u0412\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u0412\u044b\u0431\u043e\u0440 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u043d\u043e\u0433\u043e \u0441\u0442\u0438\u043b\u044f \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043e\u0434\u043d\u0438\u043c \u0438\u0437 \u043e\u0441\u043d\u043e\u0432\u043e\u043f\u043e\u043b\u0430\u0433\u0430\u044e\u0449\u0438\u0445 \u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0440\u0435\u0448\u0435\u043d\u0438\u0439 \u043f\u0440\u0438 \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u0438 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u0412 \u044d\u0442\u043e\u0439 \u0441\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0442\u0435\u0439 \u044f \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u044e \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u0442\u044c \u0441\u0430\u043c\u044b\u0435 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u044b\u0435 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u043d\u044b\u0435 \u0441\u0442\u0438\u043b\u0438 \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0438 \u043e\u0442\u0432\u0435\u0442\u0438\u0442\u044c \u043d\u0430 \u0432\u043e\u043f\u0440\u043e\u0441 \u043a\u043e\u0433\u0434\u0430 \u043a\u0430\u043a\u043e\u0439 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u043d\u044b\u0439 \u0441\u0442\u0438\u043b\u044c \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u043f\u0440\u0435\u0434\u043f\u043e\u0447\u0442\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u043c. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":95404,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-95403","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/cs\/blog\/administrirovanie\/vybor-arhitekturnogo-stilya-chast-3\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"cs_CZ\" 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