{"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\/pt\/blog\/administrirovanie\/mikroservisy-s-kommunikacziej-cherez-axon","title":{"rendered":"Microservi\u00e7os com comunica\u00e7\u00e3o via Axon","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Neste tutorial simples, criaremos alguns microsservi\u00e7os em Spring Boot e organizaremos a intera\u00e7\u00e3o entre eles atrav\u00e9s do framework Axon.<\/p>\n<p><img decoding=\"async\" alt=\"Microservi\u00e7os com comunica\u00e7\u00e3o via Axon\" 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>Suponha que temos a seguinte tarefa.<\/i><\/p>\n<p>H\u00e1 uma fonte de transa\u00e7\u00f5es no mercado de a\u00e7\u00f5es. Essa fonte nos envia as transa\u00e7\u00f5es atrav\u00e9s de uma API Rest. <\/p>\n<p>Precisamos receber essas transa\u00e7\u00f5es, armazen\u00e1-las em uma base de dados e criar um reposit\u00f3rio em mem\u00f3ria conveniente. <\/p>\n<p>Esse reposit\u00f3rio deve cumprir as seguintes fun\u00e7\u00f5es:<\/p>\n<ul>\n<li> retornar uma lista de trades;<\/li>\n<li> retornar a posi\u00e7\u00e3o completa, ou seja, uma tabela \"instrumento\" \u2014 \"quantidade atual de pap\u00e9is\";<\/li>\n<li> retornar a posi\u00e7\u00e3o para um instrumento espec\u00edfico.<\/li>\n<\/ul>\n<p>\n<i>Como chegaremos \u00e0 solu\u00e7\u00e3o dessa tarefa? <\/i><\/p>\n<p>Seguindo as diretrizes da moda dos microsservi\u00e7os, precisamos dividir a tarefa em microsservi\u00e7os componentes:<\/p>\n<ul>\n<li> obter a transa\u00e7\u00e3o via Rest;<\/li>\n<li> armazenar a transa\u00e7\u00e3o na base de dados;<\/li>\n<li> reposit\u00f3rio em mem\u00f3ria para representa\u00e7\u00e3o dos dados da posi\u00e7\u00e3o.<\/li>\n<\/ul>\n<p>\nVamos, neste tutorial, criar o primeiro e o terceiro servi\u00e7o, enquanto deixaremos o segundo para a segunda parte (deixe um coment\u00e1rio se voc\u00ea achar isso interessante).<\/p>\n<p>Portanto, temos dois microsservi\u00e7os. <\/p>\n<p>O primeiro recebe dados externos. <\/p>\n<p>O segundo processa esses dados e responde \u00e0s solicita\u00e7\u00f5es de entrada. <\/p>\n<p>Claro que queremos escalabilidade horizontal, atualiza\u00e7\u00f5es sem interrup\u00e7\u00f5es e outras vantagens dos microsservi\u00e7os.<\/p>\n<p><i>Qual \u00e9, sem d\u00favida, a tarefa desafiadora que temos pela frente?<\/i><\/p>\n<p>Na verdade, s\u00e3o muitas, mas agora vamos falar sobre como os dados ser\u00e3o trocados entre esses microsservi\u00e7os. Podemos usar Rest, podemos implementar uma fila, ou muitas outras op\u00e7\u00f5es com seus pr\u00f3s e contras.<\/p>\n<p>Vamos considerar uma das abordagens poss\u00edveis \u2014 a intera\u00e7\u00e3o ass\u00edncrona atrav\u00e9s do <b>framework Axon.<\/b>.<\/p>\n<p><i>Quais s\u00e3o as vantagens dessa solu\u00e7\u00e3o?<\/i><\/p>\n<p>Primeiro, a intera\u00e7\u00e3o ass\u00edncrona aumenta a flexibilidade (sim, h\u00e1 um lado negativo, mas por enquanto estamos focando apenas nos pontos positivos). <\/p>\n<p>Em segundo lugar, recebemos de forma nativa <b>Event Sourcing.<\/b> e <b>CQRS<\/b>. <br \/>\nEm terceiro lugar, o Axon fornece uma infraestrutura pronta, permitindo que nos concentremos apenas no desenvolvimento da l\u00f3gica de neg\u00f3cios.<\/p>\n<p>Vamos come\u00e7ar.<\/p>\n<p>O projeto ser\u00e1 feito com Gradle. Ele ter\u00e1 tr\u00eas m\u00f3dulos: <\/p>\n<ul>\n<li> common. m\u00f3dulo com estruturas de dados compartilhadas (n\u00e3o gostamos de copiar e colar);<\/li>\n<li> tradeCreator. m\u00f3dulo com o microsservi\u00e7o para receber transa\u00e7\u00f5es via Rest;<\/li>\n<li> tradeQueries. m\u00f3dulo com o microsservi\u00e7o para exibi\u00e7\u00e3o da posi\u00e7\u00e3o.<\/li>\n<\/ul>\n<p>\nUsaremos Spring Boot como base e conectaremos o starter do Axon.<\/p>\n<p>Axon funciona muito bem sem o Spring, mas vamos us\u00e1-los juntos.<\/p>\n<p>Aqui precisamos parar e dizer algumas palavras sobre o Axon. <\/p>\n<p>\u00c9 um sistema cliente-servidor. H\u00e1 um servidor \u2014 \u00e9 um aplicativo separado, que vamos executar no Docker. <\/p>\n<p>E h\u00e1 clientes que se integram aos microsservi\u00e7os. <br \/>\nO cen\u00e1rio \u00e9 o seguinte: primeiro, o Axon-server \u00e9 iniciado (no Docker), depois nossos microsservi\u00e7os. <\/p>\n<p>Ao iniciar, os microsservi\u00e7os buscam o servidor e come\u00e7am a interagir com ele. A intera\u00e7\u00e3o pode ser dividida em dois tipos: t\u00e9cnica e de neg\u00f3cios. <\/p>\n<p>T\u00e9cnica \u2014 \u00e9 a troca de mensagens 'estou vivo' (essas mensagens podem ser vistas no modo de registro debug). <\/p>\n<p>De neg\u00f3cios \u2014 \u00e9 a troca de mensagens como 'nova transa\u00e7\u00e3o'.<\/p>\n<p>Uma caracter\u00edstica importante, ap\u00f3s a inicializa\u00e7\u00e3o, o microsservi\u00e7o pode perguntar ao Axon-server 'o que aconteceu' e o servidor transmite os eventos acumulados para o microsservi\u00e7o. Assim, o microsservi\u00e7o pode ser reiniciado de forma relativamente segura sem perda de dados. <br \/>\nCom esse esquema de troca, podemos iniciar muito facilmente v\u00e1rias inst\u00e2ncias de microsservi\u00e7os, <br \/>\ninclusive em diferentes hosts.<\/p>\n<p>Sim, uma inst\u00e2ncia do Axon-server n\u00e3o \u00e9 confi\u00e1vel, mas \u00e9 o que temos por enquanto.<\/p>\n<p>Trabalhamos nas paradigmas de Event Sourcing e CQRS. Isso significa que devemos ter 'comandos', 'eventos' e 'consultas'. <\/p>\n<p>Tivemos um comando: 'criar transa\u00e7\u00e3o', um evento 'transa\u00e7\u00e3o criada' e tr\u00eas consultas: 'mostrar todas as transa\u00e7\u00f5es', 'mostrar posi\u00e7\u00e3o', 'mostrar posi\u00e7\u00e3o por instrumento'.<\/p>\n<p>O funcionamento resulta em: <\/p>\n<ol>\n<li> O microsservi\u00e7o tradeCreator recebe uma transa\u00e7\u00e3o via Rest.<\/li>\n<li> O microsservi\u00e7o tradeCreator cria um comando 'criar transa\u00e7\u00e3o' e o envia para o Axon-server.<\/li>\n<li> O Axon-server recebe o comando e o retransmite para o destinat\u00e1rio interessado, que neste caso \u00e9 o microsservi\u00e7o tradeCreator.<\/li>\n<li> O microsservi\u00e7o tradeCreator recebe o comando, forma o evento 'transa\u00e7\u00e3o criada' e o envia para o Axon-server.<\/li>\n<li> O Axon-server recebe o evento e o retransmite para os destinat\u00e1rios interessados.<\/li>\n<li> Atualmente, temos apenas um destinat\u00e1rio interessado \u2014 o microsservi\u00e7o tradeQueries.<\/li>\n<li> O microsservi\u00e7o tradeQueries recebe o evento e atualiza os dados internos.<\/li>\n<\/ol>\n<p>\n(\u00c9 importante que no momento da forma\u00e7\u00e3o do evento o microsservi\u00e7o tradeQueries pode n\u00e3o estar dispon\u00edvel, mas assim que for iniciado, receber\u00e1 imediatamente o evento).<\/p>\n<p>Sim, o Axon-server est\u00e1 no centro das comunica\u00e7\u00f5es, todas as mensagens passam por ele.<\/p>\n<p><i>Vamos come\u00e7ar a codifica\u00e7\u00e3o.<\/i><\/p>\n<p>Para n\u00e3o poluir o post com c\u00f3digo, abaixo trarei apenas fragmentos, o link para o exemplo completo estar\u00e1 abaixo.<\/p>\n<p>Vamos come\u00e7ar com o m\u00f3dulo comum.<\/p>\n<p>Nele, partes comuns s\u00e3o o evento (class CreatedTradeEvent). Note o nome, que na verdade \u00e9 o nome do comando que gerou esse evento, mas no passado. No passado, porque primeiro aparece o comando que resulta na cria\u00e7\u00e3o do evento.<\/p>\n<p>Outras estruturas comuns incluem classes para descrever a posi\u00e7\u00e3o (class Position), a negocia\u00e7\u00e3o (class Trade) e o lado da negocia\u00e7\u00e3o (enum Side), ou seja, compra ou venda.<\/p>\n<p>Vamos para o m\u00f3dulo tradeCreator. <\/p>\n<p>Esse m\u00f3dulo possui uma interface Rest (class TradeController) para aceitar negocia\u00e7\u00f5es. <br \/>\nA negocia\u00e7\u00e3o recebida \u00e9 transformada em um comando \"criar negocia\u00e7\u00e3o\" e enviada para o servidor axon.<\/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>\nPara processar o comando, \u00e9 utilizada a classe class TradeAggregate. <br \/>\nPara que o Axon a encontre, usamos a anota\u00e7\u00e3o @Aggregate.<br \/>\nO m\u00e9todo para processar o comando se parece com isto (com abrevia\u00e7\u00e3o):<\/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>\nDo comando \u00e9 gerado um evento e enviado para o servidor.<br \/>\nO comando est\u00e1 na classe CreateTradeCommand.<\/p>\n<p>Agora vamos olhar para o \u00faltimo m\u00f3dulo tradeQueries.<\/p>\n<p>As consultas s\u00e3o descritas no pacote queries.<br \/>\nNeste m\u00f3dulo tamb\u00e9m h\u00e1 uma interface Rest.<br \/>\npublic class TradeController.<\/p>\n<p>Como exemplo, vamos ver o processamento do pedido: \"mostrar todas as negocia\u00e7\u00f5es\".<\/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>\n\u00c9 criada uma consulta e enviada para o servidor.<\/p>\n<p>Para processar a consulta \u00e9 utilizada a classe TradesEventHandler.<br \/>\nNela, h\u00e1 um m\u00e9todo anotado com uma anota\u00e7\u00e3o.<\/p>\n<pre><code class=\"java\">   @QueryHandler\n    public List handleFindCurrentPositionQuery(FindCurrentPositionQuery query)\n<\/code><\/pre>\n<p>\n\u00c9 ele quem \u00e9 respons\u00e1vel pela recupera\u00e7\u00e3o de dados do armazenamento em mem\u00f3ria.<\/p>\n<p>Surge a pergunta: como a informa\u00e7\u00e3o \u00e9 atualizada nesse armazenamento. <\/p>\n<p>Come\u00e7amos pelo fato de que \u00e9 apenas um conjunto de ConcurrentHashMap, projetado para consultas espec\u00edficas. <br \/>\nPara sua atualiza\u00e7\u00e3o, \u00e9 utilizado o m\u00e9todo:<\/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>\nEle recebe o evento 'trade criada' e atualiza os Maps.<\/p>\n<p>Esses s\u00e3o os principais pontos no desenvolvimento de microsservi\u00e7os.<\/p>\n<p><i>O que pode ser dito sobre as desvantagens do Axon?<\/i><\/p>\n<p>Primeiramente, isso complica a infraestrutura, criando um ponto de falha \u2013 o servidor Axon, todas as comunica\u00e7\u00f5es passam por ele. <\/p>\n<p>Em segundo lugar, a desvantagem de sistemas distribu\u00eddos se torna bastante evidente \u2013 a inconsist\u00eancia temporal dos dados. No nosso caso, entre a recebimento de uma nova troca e a atualiza\u00e7\u00e3o dos dados para consultas pode passar tempo demais.<\/p>\n<p><i>O que ficou de fora?<\/i><\/p>\n<p>Nada foi mencionado sobre Event Sourcing e CQRS, o que s\u00e3o e para que servem.<br \/>\nSem esses conceitos sendo explicados, alguns pontos podem n\u00e3o ter ficado claros.<\/p>\n<p>Talvez alguns trechos de c\u00f3digo tamb\u00e9m precisem de explica\u00e7\u00e3o.<\/p>\n<p>Sobre isso, vamos falar no <noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/WrwW\/\">webinar aberto<\/a><\/noindex> 21 de setembro.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/petrelevich\/jvm-digging\/tree\/master\/eventSourcing\/axonTrader\">Exemplo completo<\/a><\/noindex>.<br \/>\n<br \/>Fonte: <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 5.0.3 - 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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