{"id":94393,"date":"2020-09-16T07:43:43","date_gmt":"2020-09-16T05:43:43","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/mikroservisy-s-kommunikacziej-cherez-axon"},"modified":"2020-09-16T07:43:43","modified_gmt":"2020-09-16T05:43:43","slug":"mikroservisy-s-kommunikacziej-cherez-axon","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sl\/blog\/administrirovanie\/mikroservisy-s-kommunikacziej-cherez-axon","title":{"rendered":"Mikroservisi sa komunikacijom preko Axon-a","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V tem preprostem priro\u010dniku bomo ustvarili nekaj mikroservices na Spring Boot in organizirali njihovo komunikacijo preko okvirja Axon.<\/p>\n<p><img decoding=\"async\" alt=\"Mikroservisi sa komunikacijom preko Axon-a\" src=\"\/wp-content\/uploads\/2020\/09\/d570cdb88653309c2f5b382509e5c2a9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<i>Recimo, da imamo tak\u0161no nalogo.<\/i><\/p>\n<p>Obstaja vir poslov na borzi. Ta vir nam posreduje posle preko Rest vmesnika. <\/p>\n<p>Te posle moramo prejeti, shraniti v bazo podatkov in ustvariti priro\u010dno in-memory shrambo. <\/p>\n<p>Ta shramba mora opravljati naslednje funkcije:<\/p>\n<ul>\n<li> vrniti seznam trgov;<\/li>\n<li> vrniti celotno pozicijo, torej tabelo \u00abinstrument\u00bb \u2014 \u00abtrenutno \u0161tevilo papirjev\u00bb;<\/li>\n<li> vrniti pozicijo za dolo\u010den instrument.<\/li>\n<\/ul>\n<p>\n<i>Kako se bomo lotili re\u0161itve te naloge? <\/i><\/p>\n<p>Po zapovedih mikroservices mode moramo nalogo razdeliti na sestavne mikroservices:<\/p>\n<ul>\n<li> prejemanje posla preko Rest-a;<\/li>\n<li> shranjevanje posla v bazo podatkov;<\/li>\n<li> in-memory shranjevanje za predstavitev podatkov o poziciji.<\/li>\n<\/ul>\n<p>\nV okviru tega priro\u010dnika bomo ustvarili prvi in tretji servis, drugi pa bomo pustili za drugo del (napi\u0161ite v komentarjih, \u010de vas to zanima).<\/p>\n<p>Torej, imamo dva mikroservices. <\/p>\n<p>Prvi prejema podatke od zunaj. <\/p>\n<p>Drugi te podatke obdeluje in odgovarja na prihajajo\u010de poizvedbe. <\/p>\n<p>Seveda \u017eelimo dose\u010di horizontalno skalabilnost, brez prekinitvenih posodobitev in druge prednosti mikroservices.<\/p>\n<p><i>Kak\u0161na, dokaj zahtevna, naloga je pred nami?<\/i><\/p>\n<p>Dejansko je teh zelo veliko, a zdaj se pogovorimo o tem, kako bodo podatki potovali med temi mikroservices. Med njimi je mogo\u010de tudi vzpostaviti Rest, postaviti neko vrsto vrste, in obstaja veliko zamisli s svojimi prednostmi in slabostmi.<\/p>\n<p>Oglejmo si enega izmed mo\u017enih pristopov \u2013 asinhrono sodelovanje preko <b>okvirja Axon<\/b>.<\/p>\n<p><i>Kateri so plusi te re\u0161itve?<\/i><\/p>\n<p>Najprej, asinhrono sodelovanje pove\u010duje prilagodljivost (da, tukaj je tudi slabost, a zaenkrat govorimo samo o plusih). <\/p>\n<p>Drugi\u010d, takoj dobimo <b>Event Sourcing<\/b> in <b>CQRS<\/b>. <br \/>\nTretji\u010d, Axon nudi \u017ee pripravljeno infrastrukturo, in osredoto\u010diti se moramo le na razvoj poslovne logike.<\/p>\n<p>Pri\u010dnimo.<\/p>\n<p>Projekt bo na gradle. Vsebuje tri module: <\/p>\n<ul>\n<li> common. modul z skupnimi struktura podatkov (ne maramo kopipaste);<\/li>\n<li> tradeCreator. modul z mikroservisom za prejemanje poslov preko Rest;<\/li>\n<li> tradeQueries. modul z mikroservisom za prikaz pozicije.<\/li>\n<\/ul>\n<p>\nVzamemo Spring Boot kot osnovo in pove\u017eemo starter Axona.<\/p>\n<p>Axon dela odli\u010dno deluje tudi brez Springa, vendar ju bomo uporabljali skupaj.<\/p>\n<p>Tu se moramo ustaviti in povedati nekaj besed o Axonu. <\/p>\n<p>To je klient-server sistem. Imamo stre\u017enik \u2013 to je lo\u010dena aplikacija, ki jo bomo zagnali v Dockerju. <\/p>\n<p>In imamo odjemalce, ki so vgrajeni v mikroservise. <br \/>\nIzkazalo se bo takole. Najprej se za\u017eene Axon-stre\u017enik (v Dockerju), nato na\u0161i mikroservisi. <\/p>\n<p>Ob zagonu mikroservisi i\u0161\u010dejo stre\u017enik in za\u010dnejo z njim sodelovati. Sodelovanje lahko delimo na dva tipi: tehni\u010dno in poslovno. <\/p>\n<p>Tehni\u010dno \u2013 to je izmenjava sporo\u010dil 'sem \u017eiv' (tak\u0161na sporo\u010dila lahko vidite v na\u010dinu bele\u017eenja napak). <\/p>\n<p>Poslovno \u2013 to so sporo\u010dila, kot je 'nov posel'.<\/p>\n<p>Pomembna lastnost je, da lahko po zagonu mikroservis vpra\u0161a Axon-stre\u017enik 'kaj se je zgodilo' in stre\u017enik prenese microservisu nabrana dogodke. Tako je mikroservis relativno varno mogo\u010de ponovno zagnati brez izgube podatkov. <br \/>\nPri tak\u0161nem na\u010dinu izmenjave lahko zelo enostavno za\u017eenemo veliko instanc mikroservisov, <br \/>\nnatan\u010dneje na razli\u010dnih gostiteljih.<\/p>\n<p>Ja, ena instanca Axon-stre\u017enika \u2013 to ni zanesljivo, a trenutno je tako.<\/p>\n<p>Delamo v paradigmah Event Sourcing in CQRS. To pomeni, da moramo imeti 'ukaze', 'dogodke' in 'povzetke'. <\/p>\n<p>Imeli bomo en ukaz: 'ustvari posel', en dogodek 'posel ustvarjen' in tri povzetke: 'prika\u017ei vse posle', 'prika\u017ei pozicijo', 'prika\u017ei pozicijo po orodju'.<\/p>\n<p>Tako deluje shema: <\/p>\n<ol>\n<li> Mikroservis tradeCreator sprejme posel prek Rest.<\/li>\n<li> Mikroservis tradeCreator ustvari ukaz 'ustvari posel' in ga po\u0161lje Axon-stre\u017eniku.<\/li>\n<li> Axon-stre\u017enik sprejme ukaz in ga posreduje zainteresiranemu prejemniku, v na\u0161em primeru mikroservisu tradeCreator.<\/li>\n<li> Mikroservis tradeCreator prejme ukaz, oblikuje dogodek 'posel ustvarjen' in ga po\u0161lje Axon-stre\u017eniku.<\/li>\n<li> Axon-stre\u017enik sprejme dogodek in ga posreduje zainteresiranim naro\u010dnikom.<\/li>\n<li> Trenutno imamo le enega zainteresiranega prejemnika \u2013 to je mikroservis tradeQueries.<\/li>\n<li> Mikroservis tradeQueries prejme dogodek in posodobi notranje podatke.<\/li>\n<\/ol>\n<p>\n(Pomembno je, da v trenutku oblikovanja dogodka mikroservis tradeQueries morda ni na voljo, a takoj, ko se za\u017eene, prejme dogodek).<\/p>\n<p>Ja, axon-stre\u017enik je v sredi\u0161\u010du komunikacij, vse sporo\u010dila gredo preko njega.<\/p>\n<p><i>Poglejmo k kodiranju.<\/i><\/p>\n<p>Da ne bi obremenjevali objave s kodo, spodaj bom navedel samo bloke, povezava do celotnega primera pa bo spodaj.<\/p>\n<p>Za\u010deli bomo s skupnim modulom common.<\/p>\n<p>V njem so skupni deli \u2013 dogodek (class CreatedTradeEvent). Bodite pozorni na ime, to je v bistvu ime ukaza, ki je povzro\u010dil ta dogodek, vendar v pretekliku. V pretekliku, ker najprej pride ukaz, ki privede do ustvarjanja dogodka.<\/p>\n<p>K drugim skupnim strukturam spadajo razredi za opis pozicije (class Position), transakcije (class Trade) in stran transakcije (enum Side), tj. nakup ali prodaja.<\/p>\n<p>Preidimo na modul tradeCreator. <\/p>\n<p>Ta modul ima Rest-vmesnik (class TradeController) za sprejemanje transakcij. <br \/>\nIz prejetih transakcij se oblikuje ukaz 'ustvari transakcijo' in po\u0161lje na axon-stre\u017enik.<\/p>\n<pre><code class=\"java\">    @PostMapping(\"\/trade\")\n    public ResponseEntity create(@RequestBody Trade trade) {\n        var createTradeCommand = CreateTradeCommand.builder()\n                .tradeId(trade.getTradeId())\n\t...\n                .build();\n        var result = commandGateway.sendAndWait(createTradeCommand, 3, TimeUnit.SECONDS);\n        return ResponseEntity.ok(result.get().toString());\n    }\n<\/code><\/pre>\n<p>\nZa obdelavo ukaza se uporablja razred class TradeAggregate. <br \/>\nDa ga Axon najde, dodamo anotacijo @Aggregate.<br \/>\nMetoda za obdelavo ukaza izgleda takole (skraj\u0161ano):<\/p>\n<pre><code class=\"java\">    @CommandHandler\n    public TradeAggregate(CreateTradeCommand command) {\n        log.info(\"command: {}\", command);\n        var event = CreatedTradeEvent.builder()\n                .tradeId(command.tradeId())\n\t\t....\n                .build();\n        AggregateLifecycle.apply(event);\n    }\n<\/code><\/pre>\n<p>\nIz ukaza se oblikuje dogodek in po\u0161lje na stre\u017enik.<br \/>\nUkaz se nahaja v razredu CreateTradeCommand.<\/p>\n<p>Poglejmo nazadnje modul tradeQueries.<\/p>\n<p>Poizvedbe se opisujejo v paketu queries.<br \/>\nTudi v tem modulu je Rest-vmesnik<br \/>\npublic class TradeController.<\/p>\n<p>Za primer poglejmo obdelavo poizvedbe: 'prika\u017ei vse transakcije'.<\/p>\n<pre><code class=\"java\">    @GetMapping(\"\/trade\/all\")\n    public List findAllTrades() {\n        return queryGateway.query(new FindAllTradesQuery(),\n                ResponseTypes.multipleInstancesOf(Trade.class)).join();\n    }\n<\/code><\/pre>\n<p>\nUstvari se poizvedba za izbiro in po\u0161lje na stre\u017enik.<\/p>\n<p>Za obdelavo poizvedbe se uporablja razred TradesEventHandler.<br \/>\nV njem je metoda, ozna\u010dena z anotacijo<\/p>\n<pre><code class=\"java\">   @QueryHandler\n    public List handleFindCurrentPositionQuery(FindCurrentPositionQuery query)\n<\/code><\/pre>\n<p>\nOn je tisti, ki je odgovoren za izbiro podatkov iz in-memory shrambe.<\/p>\n<p>Postavlja se vpra\u0161anje, kako se v tej shrambi posodablja informacija. <\/p>\n<p>Za\u010dnimo s tem, da je to preprosto niz ConcurrentHashMap, prilagojenih za posebne poizvedbe. <br \/>\nZa njihovo posodabljanje se uporablja metoda:<\/p>\n<pre><code class=\"java\">    @EventHandler\n    public void on(CreatedTradeEvent event) {\n        log.info(\"event:{}\", event);\n\n        var trade = Trade.builder()\n\t...\n                .build();\n        trades.put(event.tradeId(), trade);\n        position.merge(event.shortName(), event.size(),\n                (oldValue, value) -&gt; event.side() == Side.BUY ? oldValue + value : oldValue - value);\n    }<\/code><\/pre>\n<p>\nOn obdeluje dogodek \u201esklenjena trgovina\u201c in posodablja mape.<\/p>\n<p>To so klju\u010dne to\u010dke razvoj mikroservisov.<\/p>\n<p><i>Kaj lahko re\u010demo o pomanjkljivostih Axon-a?<\/i><\/p>\n<p>Prvi\u010d, to zapleta infrastrukturo, nastane to\u010dka napake \u2013 Axon stre\u017enik, vse komunikacije potekajo prek njega. <\/p>\n<p>Drugi\u010d, izrazito se poka\u017ee pomanjkljivost tak\u0161nih razdeljenih sistemov \u2013 za\u010dasna neskladnost podatkov. V na\u0161em primeru lahko med pridobitvijo nove trgovine in posodobitvijo podatkov za poizvedbe mine nedopustno veliko \u010dasa.<\/p>\n<p><i>Kaj je ostalo v ozadju?<\/i><\/p>\n<p>Popolnoma ni\u010d ni re\u010deno o Event Sourcing in CQRS, kaj sta to in zakaj sta potrebna.<br \/>\nBrez razjasnitve teh pojmov nekateri vidiki morda niso bili jasni.<\/p>\n<p>Morda tudi nekateri del\u010dki kode zahtevajo razlago.<\/p>\n<p>O tem bomo govorili na <noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/WrwW\/\">odprtem spletnem seminarju<\/a><\/noindex> 21. septembra.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/petrelevich\/jvm-digging\/tree\/master\/eventSourcing\/axonTrader\">Popoln primer<\/a><\/noindex>.<br \/>\n<br \/>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/otus\/blog\/519144\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u044d\u0442\u043e\u043c \u043f\u0440\u043e\u0441\u0442\u043e\u043c \u0442\u0443\u0442\u043e\u0440\u0438\u0430\u043b\u0435 \u043c\u044b \u0441\u0434\u0435\u043b\u0430\u0435\u043c \u043f\u0430\u0440\u0443 \u043c\u0438\u043a\u0440\u043e\u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432 \u043d\u0430 Spring Boot \u0438 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0443\u0435\u043c \u043c\u0435\u0436\u0434\u0443 \u043d\u0438\u043c\u0438 \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435 \u0447\u0435\u0440\u0435\u0437 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a Axon. \u0414\u043e\u043f\u0443\u0441\u0442\u0438\u043c \u0443 \u043d\u0430\u0441 \u0442\u0430\u043a\u0430\u044f \u0437\u0430\u0434\u0430\u0447\u0430. \u0415\u0441\u0442\u044c \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a \u0441\u0434\u0435\u043b\u043e\u043a \u043d\u0430 \u0444\u043e\u043d\u0434\u043e\u0432\u043e\u043c \u0440\u044b\u043d\u043a\u0435. \u042d\u0442\u043e\u0442 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a \u043f\u0435\u0440\u0435\u0434\u0430\u0435\u0442 \u043d\u0430\u043c \u0441\u0434\u0435\u043b\u043a\u0438 \u043f\u043e Rest-\u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0443. \u041d\u0430\u043c \u043d\u0430\u0434\u043e \u044d\u0442\u0438 \u0441\u0434\u0435\u043b\u043a\u0438 \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c, \u0441\u043e\u0445\u0440\u0430\u043d\u0438\u0442\u044c \u0432 \u0431\u0430\u0437\u0443 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438 \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0443\u0434\u043e\u0431\u043d\u043e\u0435 in-memory \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435. \u042d\u0442\u043e \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435 \u0434\u043e\u043b\u0436\u043d\u044b \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0442\u044c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":94394,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-94393","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u044d\u0442\u043e\u043c \u043f\u0440\u043e\u0441\u0442\u043e\u043c \u0442\u0443\u0442\u043e\u0440\u0438\u0430\u043b\u0435 \u043c\u044b \u0441\u0434\u0435\u043b\u0430\u0435\u043c \u043f\u0430\u0440\u0443 \u043c\u0438\u043a\u0440\u043e\u0441\u0435\u0440\u0432\u0438\u0441\u043e\u0432 \u043d\u0430 Spring Boot \u0438 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0443\u0435\u043c \u043c\u0435\u0436\u0434\u0443 \u043d\u0438\u043c\u0438 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