{"id":22442634,"url":"https://github.com/training360/javax-react-2024-03-06","last_synced_at":"2025-07-06T20:05:44.937Z","repository":{"id":226196850,"uuid":"768022601","full_name":"Training360/javax-react-2024-03-06","owner":"Training360","description":"Spring reaktív programozás tananyag","archived":false,"fork":false,"pushed_at":"2024-03-11T20:58:53.000Z","size":290,"stargazers_count":2,"open_issues_count":0,"forks_count":1,"subscribers_count":2,"default_branch":"master","last_synced_at":"2025-03-27T10:17:45.835Z","etag":null,"topics":["coursework","java"],"latest_commit_sha":null,"homepage":"","language":"Java","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":null,"status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/Training360.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":null,"code_of_conduct":null,"threat_model":null,"audit":null,"citation":null,"codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null}},"created_at":"2024-03-06T10:26:15.000Z","updated_at":"2024-04-11T14:33:08.000Z","dependencies_parsed_at":"2024-03-11T21:31:14.518Z","dependency_job_id":"ff0b50e7-df8c-4018-b16b-aa873efc5368","html_url":"https://github.com/Training360/javax-react-2024-03-06","commit_stats":null,"previous_names":["training360/javax-react-2024-03-06"],"tags_count":0,"template":false,"template_full_name":null,"purl":"pkg:github/Training360/javax-react-2024-03-06","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Training360%2Fjavax-react-2024-03-06","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Training360%2Fjavax-react-2024-03-06/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Training360%2Fjavax-react-2024-03-06/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Training360%2Fjavax-react-2024-03-06/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/Training360","download_url":"https://codeload.github.com/Training360/javax-react-2024-03-06/tar.gz/refs/heads/master","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/Training360%2Fjavax-react-2024-03-06/sbom","host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":263966173,"owners_count":23536814,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2022-07-04T15:15:14.044Z","host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["coursework","java"],"created_at":"2024-12-06T02:19:48.780Z","updated_at":"2025-07-06T20:05:44.915Z","avatar_url":"https://github.com/Training360.png","language":"Java","funding_links":[],"categories":[],"sub_categories":[],"readme":"# Reaktív programozás Spring Boot használatával\n\n---\n\nclass: inverse, center, middle\n\n# Publisherek típusai, backpressure\n\n---\n\n## Hot publisher\n\n* Azonnal létrehozza az elemeket, anélkül hogy feliratkozna egy subscriber\n* Elemeket _eager_ módon hozza létre\n* Nem ismételhető\n* Pl. egérmozgatás, HTTP kérések kiszolgálása\n\n```java\nvar values = Mono.just(getInitialValue());\n\npublic static int getInitialValue() {\n    System.out.println(\"getInitialValue\");\n    return 5;\n}\n```\n\n* Metódus `subscribe()` nélkül is lefut\n* Két `subscribe()` esetén a második nem kap elemet\n\n---\n\n## Cold publisher\n\n* Csak akkor hozza létre az elemeket, ha feliratkozik egy vagy több subscriber\n* Elemeket _lazy_ módon hozza létre\n* Ismételhető\n* Pl. HTTP kérések küldése\n* Hot publisher cold típusúvá alakítható a `defer()` metódussal\n\n```java\nvar values = Mono.defer(() -\u003e Mono.just(getInitialValue()));\n```\n\n* Metódus csak `subscribe()` hívással fut le\n* Két `subscribe()` esetén a második is megkapja az elemet\n* Coldból hot alakítható: `share()`, `replay()`\n\n---\n\nclass: inverse, center, middle\n\n# Backpressure\n\n---\n\n## Backpressure\n\n* Mechanizmus, mely akkor alkalmazandó, ha túl sok elem jön be a consumerhez a publishertől\n* Technikák: throttling, windows, buffers, dropping\n\n---\n\n## Automatikus \u003cbr /\u003e backpressure kezelés\n\n```java\nFlux.range(1, Integer.MAX_VALUE)\n        .log()\n        .concatMap(x -\u003e Mono.delay(Duration.ofMillis(100)), 1) // simulate that processing takes time\n        .blockLast();\n```\n\n* A `range()` publisher képes olyan ütemben adni az elemeket, ahogy a consumer kéri\n\n---\n\n## Nincs backpressure kezelés\n\n```java\nFlux.interval(Duration.ofMillis(1))\n        .onBackpressureDrop()\n        .log()\n        .concatMap(x -\u003e Mono.delay(Duration.ofMillis(100)))\n        .blockLast();\n```\n\n```plain\nonError(reactor.core.Exceptions$OverflowException: Could not emit tick 1 due to lack of requests \n    (interval doesn't support small downstream requests that replenish slower than the ticks))\n```\n\n* Az `interval()` publisher __nem__ képes olyan ütemben adni az elemeket, ahogy a consumer kéri\n\n---\n\n## Explicit backpressure kezelés\n\n```java\nFlux.interval(Duration.ofMillis(1))\n        .onBackpressureDrop()\n        .log()\n        .concatMap(x -\u003e Mono.delay(Duration.ofMillis(100)))\n        .blockLast();\n```\n\n* Kihagy elemeket\n\n---\n\n\nclass: inverse, center, middle\n\n# AOP\n\n---\n\n## AOP\n\n```xml\n\u003cdependency\u003e\n    \u003cgroupId\u003eorg.springframework.boot\u003c/groupId\u003e\n    \u003cartifactId\u003espring-boot-starter-aop\u003c/artifactId\u003e\n\u003c/dependency\u003e\n```\n\n`@EnableAspectJAutoProxy` annotáció\n\n---\n\n## Aspect\n\n```java\n@Component\n@Aspect\n@Slf4j\npublic class LogAspect {\n\n    @Around(\"execution(* employees.EmployeesService.*(..))\")\n    public Object logMethodCall(ProceedingJoinPoint joinpoint) throws Throwable {\n            var start = System.currentTimeMillis();\n            var result = joinpoint.proceed();\n            log.info(\"Method: {}, time: {}\", joinpoint.getSignature().getName(), System.currentTimeMillis() - start);\n            return result;\n    }\n\n}\n```\n\n---\n\n## Visszatérési érték használata\n\n```java\n@Around(\"execution(* employees.EmployeesService.*(..))\")\npublic Object upperEmployeesName(ProceedingJoinPoint joinpoint) throws Throwable {\n    return ((Flux\u003cEmployeeResource\u003e) joinpoint.proceed())\n            .doOnNext(e -\u003e e.setName(e.getName().toUpperCase()));\n}\n```\n\n---\n\nclass: inverse, center, middle\n\n# WebFilter\n\n---\n\n## WebFilter\n\n```java\n@Component\n@Slf4j\npublic class LogWebFilter implements WebFilter {\n\n    @Override\n    public Mono\u003cVoid\u003e filter(ServerWebExchange exchange, WebFilterChain chain) {\n        var now = System.currentTimeMillis();\n\n        var result = chain.filter(exchange);\n\n        log.info(\"Request: {}, time: {}\", exchange.getRequest().getPath(), System.currentTimeMillis() - now);\n        return result;\n    }\n}\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ftraining360%2Fjavax-react-2024-03-06","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Ftraining360%2Fjavax-react-2024-03-06","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Ftraining360%2Fjavax-react-2024-03-06/lists"}