{"id":46944,"date":"2023-12-12T16:39:00","date_gmt":"2023-09-04T20:26:06","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/fs2-stream-%e7%9a%84%e5%88%b6%e4%bd%9c%e6%96%b9%e5%bc%8f%e6%98%af%e5%a4%9a%e6%a0%b7%e5%8c%96%e7%9a%84%e3%80%82\/"},"modified":"2024-05-04T13:15:54","modified_gmt":"2024-05-04T05:15:54","slug":"fs2-stream-%e7%9a%84%e5%88%b6%e4%bd%9c%e6%96%b9%e5%bc%8f%e6%98%af%e5%a4%9a%e6%a0%b7%e5%8c%96%e7%9a%84%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/fs2-stream-%e7%9a%84%e5%88%b6%e4%bd%9c%e6%96%b9%e5%bc%8f%e6%98%af%e5%a4%9a%e6%a0%b7%e5%8c%96%e7%9a%84%e3%80%82\/","title":{"rendered":"FS2 Stream \u7684\u5236\u4f5c\u65b9\u5f0f\u662f\u591a\u6837\u5316\u7684"},"content":{"rendered":"<p>\u4f7f\u7528\u7eaf\u51fd\u6570\u5f0f\u7684\u6d41\u5f0fIO\u5e93FS2\uff0c\u5c1d\u8bd5\u521b\u5efa\u5404\u79cd\u4e0d\u540c\u7684\u6d41\u3002<\/p>\n<h2>\u9996\u5148<\/h2>\n<p>\u5e0c\u671b\u5728Scala\u5f00\u53d1\u4e2d\uff0c\u66f4\u591a\u5730\u4f7f\u7528\u8bf8\u5982http4s\u548cdoobie\u8fd9\u6837\u7684\u51fd\u6570\u5f0f\u5e93\uff0c\u4f46\u611f\u89c9\u5b83\u4eec\u7684\u666e\u53ca\u7a0b\u5ea6\u9010\u6e10\u589e\u52a0\uff0c\u4f46\u540c\u65f6\u4e5f\u6709\u4e00\u4e9b\u53d1\u5c55\u4e0d\u591f\u987a\u5229\u7684\u611f\u89c9\u3002<\/p>\n<p>\u5047\u8bbe\u662f\u8fd9\u6837\u7684\u8bdd\uff0c\u8003\u8651\u4e00\u4e0b\u539f\u56e0\uff0c\u4e0d\u4ec5\u4ec5\u662f\u51fd\u6570\u5f0f\u7f16\u7a0b\u672c\u8eab\u7684\u96be\u5ea6\uff0c\u8fd8\u6709\u4f7f\u7528http4s\u548cdoobie\u6240\u4f7f\u7528\u7684\u6d41\u5f0fI\/O\u5e93FS2\u7684\u590d\u6742\u6027\u4e5f\u53ef\u80fd\u662f\u5176\u4e2d\u4e00\u4e2a\u539f\u56e0\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6211\u4f1a\u5c1d\u8bd5\u5199\u4e00\u7bc7\u9002\u5408FS2\u521d\u5b66\u8005\u7684\u6587\u7ae0\u3002\u6211\u89c9\u5f97\u53ea\u8981\u5bf9Cats\/Cats Effect\u6709\u4e00\u70b9\u4e86\u89e3\u5c31\u53ef\u4ee5\u8bfb\u61c2\u3002<\/p>\n<p>\u4e3a\u4e86\u4f7f\u7528\u6d41\uff08stream\uff09\u4f5c\u4e3a\u4e00\u4e2a\u5207\u5165\u70b9\uff0c\u9996\u5148\u5fc5\u987b\u80fd\u591f\u83b7\u53d6\u5230\u6d41\uff0c\u6240\u4ee5\u5728\u8fd9\u91cc\u6211\u53ea\u6536\u96c6\u4e86\u6709\u5173\u521b\u5efa\u6d41\u7684\u65b9\u6cd5\u3002\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u5e0c\u671b\u80fd\u66f4\u5bb9\u6613\u5730\u5f62\u8c61\u5316\u6d41\u662f\u4ec0\u4e48\u6837\u7684\u3002<\/p>\n<p>\u2605 \u6211\u628aScala 3\u7cfb\u548cCats 3\u7cfb\u91cd\u5199\u52302022\/06\/21\u3002<\/p>\n<h2>\u53d6\u5411<\/h2>\n<p>\u5c1d\u8bd5\u4ece\u5404\u79cd\u6570\u636e\u6e90\u521b\u5efa\u7c7b\u578b\u4e3a Stream[F, String] \u7684\u6d41\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5358\u4e00\u306e\u5024<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u8907\u6570\u306e\u5024<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Either<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a8\u30d5\u30a7\u30af\u30c8F[_]\u5185\u306e\u5024<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u6a19\u6e96\u5165\u529b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30d5\u30a1\u30a4\u30eb<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30bf\u30a4\u30de\u30fc<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">DB\u3078\u306e\u30af\u30a8\u30ea\u7d50\u679c<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">HTTP\u30ec\u30b9\u30dd\u30f3\u30b9<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Kafka \u30b3\u30f3\u30b7\u30e5\u30fc\u30de<\/ul>\n<p>\u4f5c\u4e3a\u6307\u5bfc\u65b9\u9488\uff0c\u6211\u4eec\u9700\u8981\u4e3a\u4ee5\u4e0b\u5171\u4eab\u4ee3\u7801\u4e2d\u7684\u62bd\u8c61\u65b9\u6cd5stream\u5728\u6bcf\u4e2a\u6570\u636e\u6e90\u4e2d\u5b9e\u73b0\uff0c\u5e76\u5728run\u65b9\u6cd5\u4e2d\u53d6\u51fa\u5e76\u663e\u793a\u524d5\u4e2a\u5143\u7d20\u5230\u6807\u51c6\u8f93\u51fa\uff08\u6e90\u4ee3\u7801\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">trait<\/span> <span class=\"nc\">StreamDemoApp<\/span> <span class=\"k\">extends<\/span> <span class=\"nv\">IOApp<\/span><span class=\"o\">.<\/span><span class=\"py\">Simple<\/span><span class=\"k\">:<\/span>\r\n  <span class=\"kt\">def<\/span> <span class=\"kt\">run:<\/span> <span class=\"kt\">IO<\/span><span class=\"o\">[<\/span><span class=\"kt\">Unit<\/span><span class=\"o\">]<\/span> <span class=\"k\">=<\/span> <span class=\"n\">stream<\/span><span class=\"o\">[<\/span><span class=\"kt\">IO<\/span><span class=\"o\">]<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"py\">take<\/span><span class=\"o\">(<\/span><span class=\"mi\">5<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"py\">map<\/span><span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"n\">s<\/span><span class=\"s\">\"$s\\n\"<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"py\">through<\/span><span class=\"o\">(<\/span><span class=\"nv\">text<\/span><span class=\"o\">.<\/span><span class=\"py\">utf8<\/span><span class=\"o\">.<\/span><span class=\"py\">encode<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"py\">through<\/span><span class=\"o\">(<\/span><span class=\"nv\">io<\/span><span class=\"o\">.<\/span><span class=\"py\">stdout<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"py\">compile<\/span><span class=\"o\">.<\/span><span class=\"py\">drain<\/span>\r\n\r\n  <span class=\"k\">def<\/span> <span class=\"nf\">stream<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">[<\/span><span class=\"k\">_<\/span><span class=\"o\">]<\/span><span class=\"kt\">:<\/span> <span class=\"kt\">Async<\/span><span class=\"o\">]<\/span> <span class=\"k\">:<\/span> <span class=\"kt\">Stream<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span>, <span class=\"kt\">String<\/span><span class=\"o\">]<\/span>\r\n<\/code><\/pre>\n<p>Scala\u548c\u5e93\u7684\u7248\u672c\u5728\u8fd9\u4e00\u5757<\/p>\n<h2>\u5b9e\u65bd<\/h2>\n<h3>\u4ece\u4e00\u4e2a\u503c\u5f00\u59cb<\/h3>\n<p>\u9996\u5148\uff0c\u8bd5\u7740\u4ece\u7ed9\u5b9a\u7684\u4e00\u4e2a\u503c\u5f00\u59cb\u521b\u5efa\u4e00\u4e2a\u6d41\u3002<\/p>\n<p>\u4f7f\u7528emit\u6765\u4ece\u7ed9\u5b9a\u7684\u503c\u521b\u5efa\u4e00\u4e2a\u53ea\u5305\u542b\u4e00\u4e2a\u5143\u7d20\u7684\u6d41\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">emit<\/span><span class=\"o\">(<\/span><span class=\"s\">\"apple\"<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u4e0d\u52a0\u4e0a\u8fd9\u6837\u7684\u7c7b\u578b\u6ce8\u91ca\uff0c\u7c7b\u578b\u5c06\u53d8\u6210 Stream[Pure, String]\uff0c\u4f46\u7531\u4e8e\u7c7b\u578b Pure[A] &lt;: Nothing \u7684\u5b9a\u4e49\uff0c\u53ef\u4ee5\u8f6c\u6362\u4e3a\u4efb\u610f\u7684 F[_] \u7684 Stream[F, String]\u3002<\/p>\n<p>\u8981\u521b\u5efa\u4e00\u4e2a\u91cd\u590d\u6d41\u4f20\u9012\u7ed9\u5b9a\u503c\u7684\u6d41\uff0c\u53ef\u4ee5\u4f7f\u7528&#8221;constant&#8221;\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">constant<\/span><span class=\"o\">(<\/span><span class=\"s\">\"apple\"<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u53ea\u662f\u8fd9\u6837\uff0c\u5b83\u5c06\u6210\u4e3a\u4e00\u4e2a\u65e0\u9650\u91cd\u590d\u8f93\u51fa&#8221;apple&#8221;\u7684\u6d41\uff0c\u4f46\u5728\u4e4b\u524d\u7ed9\u51fa\u7684\u5171\u901a\u4ee3\u7801\u4e0a\u8fd0\u884c\u65f6\uff0c\u5c06\u8f93\u51fa&#8221;apple&#8221;\u4e94\u6b21\u7136\u540e\u7ed3\u675f\u3002<\/p>\n<p>\u6765\u6e90<\/p>\n<h3>\u4ece\u591a\u4e2a\u503c\u4e2d<\/h3>\n<p>fs2.Stream\u7684\u6784\u9020\u51fd\u6570\u63a5\u53d7\u53ef\u53d8\u53c2\u6570\uff0c\u56e0\u6b64\u53ef\u4ee5\u4f7f\u7528\u5b83\u6765\u521b\u5efa\u6309\u987a\u5e8f\u6d41\u52a8\u7ed9\u5b9a\u5143\u7d20\u7684\u6d41\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">Stream<\/span><span class=\"o\">(<\/span><span class=\"s\">\"apple\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"banana\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"chocolate\"<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u901a\u8fc7\u4f7f\u7528emits\u65b9\u6cd5\uff0c\u53ef\u4ee5\u4eceSeq\u4e0a\u7684\u591a\u4e2a\u5143\u7d20\u521b\u5efa\u4e00\u4e2a\u6d41\u3002\u4e3e\u4e00\u4e2a\u7ecf\u5178\u7684\u83f2\u6ce2\u90a3\u5207\u6570\u5217\u7684\u4f8b\u5b50\u5982\u4e0b\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">val<\/span> <span class=\"nv\">fib<\/span> <span class=\"k\">=<\/span> <span class=\"nv\">LazyList<\/span><span class=\"o\">.<\/span><span class=\"py\">iterate<\/span><span class=\"o\">((<\/span><span class=\"mi\">0<\/span><span class=\"o\">,<\/span> <span class=\"mi\">1<\/span><span class=\"o\">))((<\/span><span class=\"n\">a<\/span><span class=\"o\">,<\/span> <span class=\"n\">b<\/span><span class=\"o\">)<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"o\">(<\/span><span class=\"n\">b<\/span><span class=\"o\">,<\/span> <span class=\"n\">a<\/span> <span class=\"o\">+<\/span> <span class=\"n\">b<\/span><span class=\"o\">)).<\/span><span class=\"py\">take<\/span><span class=\"o\">(<\/span><span class=\"mi\">100<\/span><span class=\"o\">)<\/span>\r\n<span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">emits<\/span><span class=\"o\">(<\/span><span class=\"n\">fib<\/span><span class=\"o\">).<\/span><span class=\"py\">map<\/span><span class=\"o\">(<\/span><span class=\"nv\">_<\/span><span class=\"o\">.<\/span><span class=\"py\">_1<\/span><span class=\"o\">.<\/span><span class=\"py\">show<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u4f7f\u7528Stream.fromIterator\u53ef\u4ee5\u5c06\u8fed\u4ee3\u5668\u8f6c\u6362\u4e3a\u6d41\u3002\u5728\u4e0b\u9762\u7684\u793a\u4f8b\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4ece\u6587\u4ef6\u4e2d\u83b7\u53d6\u6d41\uff0c\u5728scala.io.Source#getLines\u4e2d\u83b7\u53d6\u8fed\u4ee3\u5668\uff0c\u7136\u540e\u521b\u5efa\u6d41\u3002<\/p>\n<p>\u6765\u6e90 (Traditional Chinese: \u4f86\u6e90; Pinyin:<\/p>\n<h3>\u65e0\u8bba \u4ece\u54ea\u91cc \/ \u4ece\u54ea\u4e2a\u65b9\u9762 \/ \u65e0\u8bba\u54ea\u4e00\u4e2a<\/h3>\n<p>\u4f7f\u7528 Stream.fromEither \u53ef\u4ee5\u4ece Either[Throwable, A] \u4e2d\u83b7\u53d6\u5230\u4e00\u4e2a\u6d41\u3002\u8981\u4ece Right \u503c\u4e2d\u83b7\u53d6 Stream[F, String]\uff0c\u53ef\u4ee5\u6309\u4ee5\u4e0b\u65b9\u5f0f\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">fromEither<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">](<\/span><span class=\"s\">\"hello\"<\/span><span class=\"o\">.<\/span><span class=\"py\">asRight<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u4ece\u5de6\u4fa7\u7684\u503c\u5f97\u5230\u7684\u6d41\u4e0e\u4e4b\u524d\u7684\u5171\u540c\u4ee3\u7801\u4e00\u6837\uff0c\u4f46\u5982\u679c\u76f4\u63a5\u5728\u524d\u9762\u7684\u5171\u540c\u4ee3\u7801\u4e2d\u8fdb\u884c\u8bc4\u4f30\uff0c\u5c06\u4f1a\u629b\u51fa\u8fd0\u884c\u65f6\u5f02\u5e38\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">fromEither<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">](<\/span><span class=\"nc\">Exception<\/span><span class=\"o\">(<\/span><span class=\"s\">\"test\"<\/span><span class=\"o\">).<\/span><span class=\"py\">asLeft<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u4e8b\u5b9e\u4e0a\uff0cfromEither\u7684F[_] \u662f\u57fa\u4e8eApplicativeError\u7684\uff0c\u5f02\u5e38\u88ab\u4fdd\u7559\u5728ApplicativeError[F] \u7684\u4e0a\u4e0b\u6587\u4e2d\uff0c\u56e0\u6b64\u53ef\u4ee5\u5728.compile.drain\u7b49\u64cd\u4f5c\u540e\uff0c\u5c06\u5176\u8f6c\u6362\u4e3aF[_]\uff0c\u518d\u4f7f\u7528Cats\u7684applicativeError\u8bed\u6cd5\u8fdb\u884c\u5904\u7406\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">object<\/span> <span class=\"nc\">FromEitherIO<\/span> <span class=\"k\">extends<\/span> <span class=\"nv\">IOApp<\/span><span class=\"o\">.<\/span><span class=\"py\">Simple<\/span><span class=\"k\">:<\/span>\r\n  <span class=\"kt\">def<\/span> <span class=\"kt\">run:<\/span> <span class=\"kt\">IO<\/span><span class=\"o\">[<\/span><span class=\"kt\">Unit<\/span><span class=\"o\">]<\/span> <span class=\"k\">=<\/span>\r\n    <span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">fromEither<\/span><span class=\"o\">[<\/span><span class=\"kt\">IO<\/span><span class=\"o\">](<\/span><span class=\"nc\">Exception<\/span><span class=\"o\">(<\/span><span class=\"s\">\"test\"<\/span><span class=\"o\">).<\/span><span class=\"py\">asLeft<\/span><span class=\"o\">)<\/span>\r\n      <span class=\"o\">.<\/span><span class=\"py\">compile<\/span><span class=\"o\">.<\/span><span class=\"py\">drain<\/span>\r\n      <span class=\"o\">.<\/span><span class=\"py\">handleErrorWith<\/span><span class=\"o\">(<\/span><span class=\"nv\">_<\/span><span class=\"o\">.<\/span><span class=\"py\">getMessage<\/span> <span class=\"n\">pipe<\/span> <span class=\"nv\">IO<\/span><span class=\"o\">.<\/span><span class=\"py\">println<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u6765\u6e90<\/p>\n<h3>\u8bf7\u7528\u4e2d\u6587\u7565\u8ff0\u4ee5\u4e0b\u5185\u5bb9\uff0c\u53ea\u9700\u4e00\u79cd\u9009\u9879\uff1a<\/h3>\n<p>\u65b9\u6848[A]<\/p>\n<p>\u8981\u4ece\u8fdb\u5165\u6548\u679cF[_]\u7684A\u4e2d\u83b7\u5f97Stream[F, A]\uff0c\u53ef\u4ee5\u4f7f\u7528Stream.eval\u3002<br \/>\n\u4f8b\u5982\uff0c\u4f7f\u7528Stream.eval(IO(&#8220;Hello&#8221;))\uff0c\u53ef\u4ee5\u5f97\u5230\u7c7b\u578b\u4e3aStream[IO, String]\u7684\u6d41\u3002<\/p>\n<p>\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e2a\u5c06F[Seq[_]]\u4f5c\u4e3a\u503c\u57df\u7684evalSeq\u51fd\u6570\uff0c\u53ef\u4ee5\u5199\u6210\u5982\u4e0b\u6240\u793a\u7684\u5f62\u5f0f\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">val<\/span> <span class=\"nv\">strings<\/span><span class=\"k\">:<\/span> <span class=\"kt\">F<\/span><span class=\"o\">[<\/span><span class=\"kt\">List<\/span><span class=\"o\">[<\/span><span class=\"kt\">String<\/span><span class=\"o\">]]<\/span> <span class=\"k\">=<\/span> <span class=\"nc\">Sync<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">].<\/span><span class=\"py\">delay<\/span><span class=\"o\">(<\/span><span class=\"nc\">List<\/span><span class=\"o\">(<\/span><span class=\"s\">\"apple\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"banana\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"chocolate\"<\/span><span class=\"o\">))<\/span>\r\n<span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">evalSeq<\/span><span class=\"o\">(<\/span><span class=\"n\">strings<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u6765\u6e90<\/p>\n<h3>\u4ece\u6807\u51c6\u8f93\u5165\u8bfb\u53d6<\/h3>\n<p>\u4e3a\u4e86\u4ece\u6807\u51c6\u8f93\u5165\u83b7\u5f97\u6d41\uff0c\u8bf7\u4f7f\u7528 fs2-io \u6a21\u5757\u4e2d\u7684 fs2.io.stdin* \u65b9\u6cd5\u3002\u4ee5\u4e0b\u4ee3\u7801\u5c06\u76f4\u63a5\u56de\u663e\u8f93\u5165\u7684\u5b57\u7b26\u4e32\u30025<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">io<\/span><span class=\"o\">.<\/span><span class=\"py\">stdinUtf8<\/span><span class=\"o\">(<\/span><span class=\"mi\">4096<\/span><span class=\"o\">).<\/span><span class=\"py\">through<\/span><span class=\"o\">(<\/span><span class=\"nv\">text<\/span><span class=\"o\">.<\/span><span class=\"py\">lines<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>There\u2019s no context provided for the word &#8220;\u30bd\u30fc\u30b9,&#8221; so I will provide a few possible translations in Chinese:<\/p>\n<p>1. \u539f\u6599<br \/>\n2. \u8c03\u6599<br \/>\n3. \u9171\u6c41 zh\u012b)<br \/>\n4. \u6e90\u4ee3\u7801 m\u01ce)<\/p>\n<p>Please provide more context if you want a more accurate translation.<\/p>\n<h3>\u4ece\u6587\u4ef6\u4e2d<\/h3>\n<p>\u4f8b\u5982\uff0c<\/p>\n<blockquote><p>\u5c06\u6587\u4ef6\u4e2d\u7684\u6587\u672c\u9010\u884c\u5206\u5272\u4e3aStream[F, String]\u3002\u8bf7\u786e\u4fdd\u4f7f\u7528\u540e\u6587\u4ef6\u88ab\u53ef\u9760\u5173\u95ed\u3002<\/p><\/blockquote>\n<p>\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528Cats Effect \u7684Resource\u3002<\/p>\n<p>\u5982\u679c F[A] \u662f F[_]: Sync\uff0c\u5e76\u4e14 A \u662f AutoCloseable \u7684\u5b50\u7c7b\u578b\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528 Resource.fromAutoCloseable \u4ece F[A] \u4e2d\u751f\u6210 Resource\uff0c\u5e76\u4e14\u6240\u5f97\u5230\u7684 Resource \u53ef\u4ee5\u901a\u8fc7 Stream.resource \u8f6c\u6362\u4e3a\u6d41\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u53ef\u4ee5\u7528\u4ee5\u4e0b\u65b9\u5f0f\u5199\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">val<\/span> <span class=\"nv\">file<\/span><span class=\"k\">:<\/span> <span class=\"kt\">Resource<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span>, <span class=\"kt\">Source<\/span><span class=\"o\">]<\/span> <span class=\"k\">=<\/span>\r\n  <span class=\"nv\">Resource<\/span><span class=\"o\">.<\/span><span class=\"py\">fromAutoCloseable<\/span><span class=\"o\">(<\/span><span class=\"n\">sync<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">].<\/span><span class=\"py\">delay<\/span><span class=\"o\">(<\/span><span class=\"nv\">Source<\/span><span class=\"o\">.<\/span><span class=\"py\">fromFile<\/span><span class=\"o\">(<\/span><span class=\"s\">\"README.md\"<\/span><span class=\"o\">)))<\/span>\r\n\r\n<span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">resource<\/span><span class=\"o\">(<\/span><span class=\"n\">file<\/span><span class=\"o\">)<\/span> <span class=\"o\">&gt;&gt;=<\/span> <span class=\"o\">(<\/span><span class=\"n\">s<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">fromIterator<\/span><span class=\"o\">(<\/span><span class=\"nv\">s<\/span><span class=\"o\">.<\/span><span class=\"py\">getLines<\/span><span class=\"o\">,<\/span> <span class=\"mi\">4096<\/span><span class=\"o\">))<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u662f\u53ea\u8981\u4e00\u79cd\u9009\u62e9: \u7ffb\u8bd1\u4ee5\u4e0b\u5185\u5bb9\u4e3a\u4e2d\u6587\u539f\u751f\u8bed\u8a00\uff1a<br \/>\n\u6e90\u4ee3\u7801<\/p>\n<h3>\u4ece\u5b9a\u65f6\u5668\u5f00\u59cb<\/h3>\n<p>\u4f8b\u5982\uff0c\u53ef\u4ee5\u5c06\u8bf8\u5982\u201c\u8fdb\u884c2\u79d2\u7684\u5ef6\u8fdf\u5e76\u53d1\u51fa\u5ef6\u8fdf\u524d\u540e\u7684\u65f6\u95f4\u201d\u7684\u4efb\u52a1\u8868\u793a\u4e3a\u6d41\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">val<\/span> <span class=\"nv\">currentSec<\/span><span class=\"k\">:<\/span> <span class=\"kt\">F<\/span><span class=\"o\">[<\/span><span class=\"kt\">String<\/span><span class=\"o\">]<\/span> <span class=\"k\">=<\/span>\r\n  <span class=\"nc\">Clock<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">].<\/span><span class=\"py\">realTime<\/span><span class=\"o\">.<\/span><span class=\"py\">map<\/span><span class=\"o\">(<\/span><span class=\"n\">n<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"o\">(<\/span><span class=\"nv\">n<\/span><span class=\"o\">.<\/span><span class=\"py\">toSeconds<\/span> <span class=\"o\">%<\/span> <span class=\"mi\">60<\/span><span class=\"o\">).<\/span><span class=\"py\">toString<\/span><span class=\"o\">)<\/span>\r\n\r\n<span class=\"k\">val<\/span> <span class=\"nv\">task<\/span><span class=\"k\">:<\/span> <span class=\"kt\">Stream<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span>, <span class=\"kt\">String<\/span><span class=\"o\">]<\/span> <span class=\"k\">=<\/span> <span class=\"k\">for<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"n\">s<\/span> <span class=\"k\">&lt;-<\/span> <span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">eval<\/span><span class=\"o\">(<\/span><span class=\"n\">currentSec<\/span><span class=\"o\">)<\/span>    <span class=\"c1\">\/\/ \u958b\u59cb\u79d2<\/span>\r\n  <span class=\"k\">_<\/span> <span class=\"k\">&lt;-<\/span> <span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">sleep<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">](<\/span><span class=\"mi\">2<\/span> <span class=\"n\">seconds<\/span><span class=\"o\">)<\/span> <span class=\"c1\">\/\/ 2\u79d2\u30b9\u30ea\u30fc\u30d7<\/span>\r\n  <span class=\"n\">e<\/span> <span class=\"k\">&lt;-<\/span> <span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">eval<\/span><span class=\"o\">(<\/span><span class=\"n\">currentSec<\/span><span class=\"o\">)<\/span>    <span class=\"c1\">\/\/ \u7d42\u4e86\u79d2<\/span>\r\n<span class=\"o\">}<\/span> <span class=\"k\">yield<\/span> <span class=\"n\">s<\/span><span class=\"s\">\"$s ---&gt; $e\"<\/span>             <span class=\"c1\">\/\/ \u958b\u59cb\u79d2\u3068\u7d42\u4e86\u79d2\u3092\u66f8\u5f0f\u5316<\/span>\r\n<\/code><\/pre>\n<p>\u53e6\u5916\uff0c\u4f7f\u7528FS2\u7684\u8ba1\u65f6\u5668\u76f8\u5173\u65b9\u6cd5\u8fd8\u53ef\u4ee5\u5b9e\u73b0\u5b9a\u671f\u6267\u884c\uff0c\u4f8b\u5982\u4f7f\u7528fixedDelay\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">fixedDelay<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">](<\/span><span class=\"mi\">3<\/span> <span class=\"n\">seconds<\/span><span class=\"o\">)<\/span> <span class=\"n\">zipRight<\/span> <span class=\"nv\">task<\/span><span class=\"o\">.<\/span><span class=\"py\">repeat<\/span> <span class=\"c1\">\/\/ \u30bf\u30b9\u30af\u304c\u7d42\u4e86\u3059\u308b\u3054\u3068\u306b3\u79d2\u5f85\u3064<\/span>\r\n<\/code><\/pre>\n<p>\u5c06\u4efb\u52a1\u91cd\u590d\u4e3a\u65e0\u9650\u6d41\uff0c\u4f7f\u75283\u79d2\u95f4\u9694\u7684fixedDelay\u548czipRight\u8fdb\u884c\u64cd\u4f5c\uff0c\u6267\u884c\u540e\u5c06\u4ea7\u751f\u4ee5\u4e0b\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code>13 ---&gt; 15\r\n18 ---&gt; 20\r\n23 ---&gt; 25\r\n28 ---&gt; 30\r\n33 ---&gt; 35\r\n<\/code><\/pre>\n<p>\u4e2d\u6587\u7ffb\u8bd1: \u8fd9\u4e2a\u7b54\u6848\u6765\u6e90<\/p>\n<h3>\u4eceDB\u67e5\u8be2\u7ed3\u679c\u4e2d<\/h3>\n<p>\u901a\u8fc7\u4f7f\u7528 Doobie\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u5e93\u67e5\u8be2\u7ed3\u679c\u4f5c\u4e3a\u6d41\u8fdb\u884c\u83b7\u53d6\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u6309\u4ee5\u4e0b\u65b9\u5f0f\u7f16\u5199\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">val<\/span> <span class=\"nv\">xa<\/span> <span class=\"k\">=<\/span> <span class=\"nv\">Transactor<\/span><span class=\"o\">.<\/span><span class=\"py\">fromDriverManager<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">](<\/span>\r\n  <span class=\"s\">\"org.postgresql.Driver\"<\/span><span class=\"o\">,<\/span> <span class=\"c1\">\/\/ driver classname<\/span>\r\n  <span class=\"s\">\"jdbc:postgresql:world\"<\/span><span class=\"o\">,<\/span> <span class=\"c1\">\/\/ connect URL (driver-specific)<\/span>\r\n  <span class=\"s\">\"postgres\"<\/span><span class=\"o\">,<\/span>              <span class=\"c1\">\/\/ user<\/span>\r\n  <span class=\"s\">\"\"<\/span>                       <span class=\"c1\">\/\/ password<\/span>\r\n<span class=\"o\">)<\/span>\r\n<span class=\"n\">sql<\/span><span class=\"s\">\"select name from country where population &gt; 50000000 order by population desc\"<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"py\">query<\/span><span class=\"o\">[<\/span><span class=\"kt\">String<\/span><span class=\"o\">]<\/span> <span class=\"c1\">\/\/ Query0[String]<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"py\">stream<\/span>        <span class=\"c1\">\/\/ Stream[ConnectionIO, String]<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"py\">transact<\/span><span class=\"o\">(<\/span><span class=\"n\">xa<\/span><span class=\"o\">)<\/span>  <span class=\"c1\">\/\/ Stream[F, String]<\/span>\r\n<\/code><\/pre>\n<p>\u203b \u4f7f\u7528doobie\u5728PostgreSQL\u4e0a\u7684world DB\u793a\u4f8b\u3002\u8bbe\u7f6e\u6b65\u9aa4\u5728\u8fd9\u91cc\u3002<\/p>\n<p>\u53ef\u4ee5\u53ea\u63d0\u4f9b\u4e00\u79cd\u9009\u62e9\u7684\u6c49\u8bed\u672c\u5730\u91ca\u4e49\uff1a\u8c03\u6599<\/p>\n<h3>\u4eceHTTP\u54cd\u5e94\u4e2d<\/h3>\n<p>\u8bd5\u7740\u4f7f\u7528http4s\u7684\u5ba2\u6237\u7aef\u5c06Twitter\u7684\u793a\u4f8b\u54cd\u5e94\u8f6c\u5316\u4e3a\u6d41\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">val<\/span> <span class=\"nv\">req<\/span> <span class=\"k\">=<\/span> <span class=\"nc\">Request<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">](<\/span><span class=\"nv\">Method<\/span><span class=\"o\">.<\/span><span class=\"py\">GET<\/span><span class=\"o\">,<\/span> <span class=\"n\">uri<\/span><span class=\"s\">\"https:\/\/stream.twitter.com\/1.1\/statuses\/sample.json\"<\/span><span class=\"o\">)<\/span>\r\n\r\n<span class=\"c1\">\/\/ \u30ea\u30af\u30a8\u30b9\u30c8\u306b\u7f72\u540d\u3059\u308b\u30e1\u30bd\u30c3\u30c9\uff08\u8a73\u7d30\u306f\u4e0b\u306b\u5225\u8a18\uff09<\/span>\r\n<span class=\"k\">val<\/span> <span class=\"nv\">sign<\/span><span class=\"k\">:<\/span> <span class=\"kt\">Request<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">]<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"n\">F<\/span><span class=\"o\">[<\/span><span class=\"kt\">Request<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">]]<\/span> <span class=\"k\">=<\/span> <span class=\"o\">???<\/span>\r\n\r\n<span class=\"k\">for<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"n\">client<\/span>    <span class=\"k\">&lt;-<\/span> <span class=\"nc\">BlazeClientBuilder<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span><span class=\"o\">].<\/span><span class=\"py\">stream<\/span> <span class=\"c1\">\/\/ Blaze \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3092\u5f97\u308b<\/span>\r\n  <span class=\"n\">signedReq<\/span> <span class=\"k\">&lt;-<\/span> <span class=\"nv\">Stream<\/span><span class=\"o\">.<\/span><span class=\"py\">eval<\/span><span class=\"o\">(<\/span><span class=\"nf\">sign<\/span><span class=\"o\">(<\/span><span class=\"n\">req<\/span><span class=\"o\">))<\/span>   <span class=\"c1\">\/\/ eval \u3067 F[Request] \u304b\u3089 Stream[F, Request]\u306b<\/span>\r\n  <span class=\"n\">res<\/span>       <span class=\"k\">&lt;-<\/span> <span class=\"nv\">client<\/span><span class=\"o\">.<\/span><span class=\"py\">stream<\/span><span class=\"o\">(<\/span><span class=\"n\">signedReq<\/span><span class=\"o\">)<\/span> <span class=\"c1\">\/\/ Stream[F, Response[F]] \u3092\u5f97\u308b<\/span>\r\n                 <span class=\"o\">.<\/span><span class=\"py\">flatMap<\/span><span class=\"o\">(<\/span><span class=\"nv\">_<\/span><span class=\"o\">.<\/span><span class=\"py\">body<\/span><span class=\"o\">.<\/span><span class=\"py\">chunks<\/span><span class=\"o\">.<\/span><span class=\"py\">parseJsonStream<\/span><span class=\"o\">)<\/span> <span class=\"c1\">\/\/ Stream[F, Json]\u3092\u5f97\u308b<\/span>\r\n<span class=\"o\">}<\/span> <span class=\"k\">yield<\/span> <span class=\"nv\">res<\/span><span class=\"o\">.<\/span><span class=\"py\">spaces2<\/span> <span class=\"c1\">\/\/ \u3044\u3044\u611f\u3058\u306b\u6587\u5b57\u5217\u5316\u3059\u308b<\/span>\r\n<\/code><\/pre>\n<details>\u3010\u88dc\u8db3\u3011\u5982\u4f55\u7b7e\u540d\u8bf7\u6c42<br \/>\n\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u4ee3\u7801\u5bf9\u8bf7\u6c42\u8fdb\u884c\u7b7e\u540d\u3002<br \/>\nval env = (F\uff1aAsync[F]) ?=&gt; (key\uff1aString) =&gt; F.delay(<br \/>\nsys.env.get(key).toRight(RuntimeException(s&#8221;no env value for key: $key&#8221;))<br \/>\n) &gt;&gt;= F.fromEitherval sign: Request[F] =&gt; F[Request[F]] = req =&gt; for {<br \/>\nconsumerKey &lt;- env(&#8220;consumerKey&#8221;)<br \/>\nconsumerSecret &lt;- env(&#8220;consumerSecret&#8221;)<br \/>\naccessToken &lt;- env(&#8220;accessToken&#8221;)<br \/>\naccessSecret &lt;- env(&#8220;accessSecret&#8221;)<br \/>\nsignedReq &lt;- oauth1.signRequest(<br \/>\nreq = req,<br \/>\nconsumer = Consumer(consumerKey, consumerSecret),<br \/>\ntoken = Token(accessToken, accessSecret).some,<br \/>\nrealm = None,<br \/>\ntimestampGenerator = Timestamp.now,<br \/>\nnonceGenerator = Nonce.now)<br \/>\n} yield signedReq<\/p>\n<p>\u8981\u5b9e\u9645\u8fd0\u884c\uff0c\u9700\u8981\u5728Twitter\u5f00\u53d1\u8005\u8d26\u6237\u4e2d\u521b\u5efa\u4e00\u4e2aApp\uff0c\u5e76\u5c06consumerKey\u3001consumerSecret\u3001accessToken\u3001accessSecret\u8bbe\u7f6e\u4e3a\u73af\u5883\u53d8\u91cf\u3002<\/p>\n<\/details>\n<p>\u539f\u6587\uff1a<br \/>\n\u30bd\u30fc\u30b9<\/p>\n<p>\u6c49\u8bed\u7ffb\u8bd1\uff1a<br \/>\n\u9171\u6c41<\/p>\n<h3>\u4eceKafka Consumer<\/h3>\n<p>\u4f7f\u7528fs2-kafka\u53ef\u4ee5\u4eceKafka Consumer\u4e2d\u83b7\u53d6\u6d41\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">val<\/span> <span class=\"nv\">consumerSettings<\/span> <span class=\"k\">=<\/span> <span class=\"nc\">ConsumerSettings<\/span><span class=\"o\">[<\/span><span class=\"kt\">F<\/span>, <span class=\"kt\">String<\/span>, <span class=\"kt\">String<\/span><span class=\"o\">]<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"py\">withAutoOffsetReset<\/span><span class=\"o\">(<\/span><span class=\"nv\">AutoOffsetReset<\/span><span class=\"o\">.<\/span><span class=\"py\">Earliest<\/span><span class=\"o\">)<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"py\">withBootstrapServers<\/span><span class=\"o\">(<\/span><span class=\"s\">\"localhost:9092\"<\/span><span class=\"o\">)<\/span>\r\n  <span class=\"o\">.<\/span><span class=\"py\">withGroupId<\/span><span class=\"o\">(<\/span><span class=\"s\">\"group\"<\/span><span class=\"o\">)<\/span>\r\n\r\n <span class=\"nv\">KafkaConsumer<\/span><span class=\"o\">.<\/span><span class=\"py\">stream<\/span><span class=\"o\">(<\/span><span class=\"n\">consumerSettings<\/span><span class=\"o\">)<\/span>\r\n   <span class=\"o\">.<\/span><span class=\"py\">evalTap<\/span><span class=\"o\">(<\/span><span class=\"nv\">_<\/span><span class=\"o\">.<\/span><span class=\"py\">subscribeTo<\/span><span class=\"o\">(<\/span><span class=\"s\">\"topic\"<\/span><span class=\"o\">))<\/span>\r\n   <span class=\"o\">.<\/span><span class=\"py\">flatMap<\/span><span class=\"o\">(<\/span><span class=\"nv\">_<\/span><span class=\"o\">.<\/span><span class=\"py\">stream<\/span><span class=\"o\">)<\/span>  <span class=\"c1\">\/\/ \u3053\u3053\u3067 KafkaConsumer \u304b\u3089 stream \u3092\u5f97\u308b<\/span>\r\n   <span class=\"o\">.<\/span><span class=\"py\">map<\/span><span class=\"o\">(<\/span><span class=\"n\">c<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"n\">s<\/span><span class=\"s\">\"${c.record.key}-&gt;${c.record.value}\"<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u540e\u4f1a\u8fdb\u5165\u7b49\u5f85\u72b6\u6001\uff0c\u4f8b\u5982\u5728Python\u7684REPL\u4e0a\u521b\u5efa\u4e00\u4e2aProducer\u53d1\u9001\u6d88\u606f\uff0c\u5b83\u4f1a\u9010\u4e2a\u8bfb\u53d6\u5e76\u5728\u63a7\u5236\u53f0\u4e0a\u663e\u793a\uff0c\u5904\u7406\u5b8c5\u6761\u6d88\u606f\u540e\u4f1a\u7ed3\u675f\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u662f\u4f7f\u7528kafka-python\u7684\u793a\u4f8b\u3002<\/p>\n<pre class=\"post-pre\"><code>&gt;&gt;&gt; from kafka import KafkaProducer\r\n&gt;&gt;&gt; producer = KafkaProducer(bootstrap_servers='localhost:9092')\r\n&gt;&gt;&gt; producer.send('topic', key=b'kkk', value=bytes(f\"hello\", 'utf-8'))\r\n<\/code><\/pre>\n<details>\u3010\u88dc\u8db3\u3011\u4ee5Docker\u65b9\u5f0f\u542f\u52a8Kafka\u7684\u65b9\u6cd5<br \/>\n\u53ea\u9700\u5728docker-compose.yaml\u4e2d\u5199\u5165\u4ee5\u4e0b\u5185\u5bb9\uff0c\u5373\u53ef\u901a\u8fc7`$ docker-compose up -d` \u5feb\u6377\u65b9\u4fbf\u5730\u542f\u52a8\u3002<br \/>\nservices:<br \/>\n&#8230;<br \/>\nzookeeper:<br \/>\nimage: wurstmeister\/zookeeper<br \/>\nports:<br \/>\n&#8211; &#8220;2181:2181&#8221;<br \/>\nkafka:<br \/>\nimage: wurstmeister\/kafka<br \/>\nports:<br \/>\n&#8211; &#8220;9092:9092&#8221;<br \/>\nenvironment:<br \/>\nKAFKA_ADVERTISED_HOST_NAME: 127.0.0.1<br \/>\nKAFKA_ZOOKEEPER_CONNECT: zookeeper:2181<\/details>\n<p>\u539f\u6587\u4e2d\u6ca1\u6709\u8db3\u591f\u7684\u4e0a\u4e0b\u6587\uff0c\u56e0\u6b64\u6211\u65e0\u6cd5\u63d0\u4f9b\u51c6\u786e\u7684\u4e2d\u6587\u7ffb\u8bd1\u3002\u8bf7\u63d0\u4f9b\u66f4\u591a\u4fe1\u606f\u6216\u91cd\u65b0\u63d0\u51fa\u95ee\u9898\u3002<\/p>\n<section>\u57282019\u5e743\u6708\u7684\u4e00\u9879\u8c03\u67e5\u4e2d\uff0cDoobie\u9996\u6b21\u6210\u4e3aRDBMS\u5e93\u90e8\u95e8\u7684\u6700\u53d7\u6b22\u8fce\u9009\u62e9\u3002\u5728\u540c\u4e00\u9879\u8c03\u67e5\u4e2d\uff0chttp4s\/fs2\u7684\u7968\u6570\u4ecd\u7136\u4f4e\u4e8eakka http\/streams\u3002\u987a\u4fbf\u63d0\u4e00\u53e5\uff0c\u5728\u65e5\u672c\u7684Scala\u9879\u76ee\/\u62db\u8058\u4fe1\u606f\u4e2d\uff0cakka http\u751a\u81f3\u8fd8\u4e0d\u5982Play\u5360\u5927\u591a\u6570\u3002<\/p>\n<p>\u6211\u89c9\u5f97\u5728\u6211\u5b66\u4e60\u300aFP in Scala\u300b\u65f6\uff0c\u7b2c15\u7ae0\u201c\u6d41\u5904\u7406\u548c\u589e\u91cfI\/O\u201d\u7684\u5185\u5bb9\u5c24\u4e3a\u56f0\u96be\u3002<\/p>\n<p>\u5728\u65e7\u7248\u672c\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u7ee7\u627fIOApp\u7c7b\uff0c\u4f46\u5728Cats Effect 3\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528IOApp.Simple\uff0c\u8fd9\u6837\u4f1a\u7b80\u6d01\u4e00\u4e9b\u3002<\/p>\n<p>\u5728\u65e7\u7248fs2\u4e2d\uff0c\u4e3a\u4e86\u4f7f\u7528io.stdin\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528Blocker\uff0c\u4f46\u73b0\u5728\u4e0d\u518d\u9700\u8981\u3002<\/p>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528\u7eaf\u51fd\u6570\u5f0f\u7684\u6d41\u5f0fIO\u5e93FS2\uff0c\u5c1d\u8bd5\u521b\u5efa\u5404\u79cd\u4e0d\u540c\u7684\u6d41\u3002 \u9996\u5148 \u5e0c\u671b\u5728Scala\u5f00\u53d1\u4e2d\uff0c\u66f4\u591a\u5730\u4f7f\u7528\u8bf8\u5982http4 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-46944","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO 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