{"id":46825,"date":"2023-10-01T10:50:17","date_gmt":"2023-11-20T04:01:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8kafka%e4%b8%ad%e4%bd%bf%e7%94%a8scala%e7%bc%96%e5%86%99%e7%9a%84%e7%94%9f%e4%ba%a7%e8%80%85%e5%92%8c%e6%b6%88%e8%b4%b9%e8%80%85\/"},"modified":"2024-05-04T02:21:10","modified_gmt":"2024-05-03T18:21:10","slug":"%e5%9c%a8kafka%e4%b8%ad%e4%bd%bf%e7%94%a8scala%e7%bc%96%e5%86%99%e7%9a%84%e7%94%9f%e4%ba%a7%e8%80%85%e5%92%8c%e6%b6%88%e8%b4%b9%e8%80%85","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8kafka%e4%b8%ad%e4%bd%bf%e7%94%a8scala%e7%bc%96%e5%86%99%e7%9a%84%e7%94%9f%e4%ba%a7%e8%80%85%e5%92%8c%e6%b6%88%e8%b4%b9%e8%80%85\/","title":{"rendered":"\u5728Kafka\u4e2d\u4f7f\u7528Scala\u7f16\u5199\u7684\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005"},"content":{"rendered":"

\u4e00\u5f00\u59cb<\/h1>\n

\u7531\u4e8e\u53ef\u80fd\u8981\u4f7f\u7528Kafka\uff0c\u6240\u4ee5\u5c06\u5c1d\u8bd5\u7528\u51e0\u79cd\u8bed\u8a00\u7f16\u5199\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005\u7684\u4ee3\u7801\u3002<\/p>\n

\u4e0a\u6b21\u6211\u5c1d\u8bd5\u4e86\u4f7f\u7528Golang\u3002<\/p>\n

\u672c\u6b21\u6f14\u793a\u5c06\u4ecb\u7ecdScala\u3002\u5728\u4f7f\u7528Scala\u65f6\uff0c\u4f3c\u4e4e\u9700\u8981\u4f7f\u7528Java\u5ba2\u6237\u7aef\uff0c\u4f46\u7531\u4e8eAkka\u5df2\u7ecf\u4e3aAkka Stream\u5f00\u53d1\u4e86\u4e00\u4e2a\u65b9\u4fbf\u7684\u5305\u88c5\u5668Akka-Stream-Kafka\uff0c\u56e0\u6b64\u6211\u4eec\u5c06\u5c1d\u8bd5\u4f7f\u7528\u5b83\u3002<\/p>\n

\uff0a\u4e0d\u4f1a\u89e3\u91caKafka\u672c\u8eab\u6216Akka-Stream\u672c\u8eab\u3002<\/p>\n

\u7ec4\u6210<\/h2>\n

IntelliJ\uff1a2018\u5e74
\nScala\uff1a2.12\u7248\u672c
\nsbt\uff1a1.1\u7248\u672c
\nAkka\uff1a2.5\u7248\u672c
\nAkka-Stream\uff1a2.5\u7248\u672c
\nAkka-Stream-Kafka\uff1a0.2\u7248\u672c
\nSpray-Json\uff1a1.3\u7248\u672c<\/p>\n

\u4ea7\u54c1\u6216\u7ed3\u679c<\/h2>\n

“\u7b80\u79f0\u4e3asbt”<\/h1>\n

\u6211\u4f1a\u89e3\u51b3\u4f9d\u5b58\u5173\u7cfb\u3002\u9664\u4e86Akka-Stream-Kafka\u76f8\u5173\uff0c\u6211\u4f1a\u4f7f\u7528spray-json\u8fdb\u884c\u6d88\u606f\u7684\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u3002<\/p>\n

name<\/span> :=<\/span> \"scala-kafka-example\"<\/span>\r\n\r\nversion<\/span> :=<\/span> \"0.1\"<\/span>\r\n\r\nscalaVersion<\/span> :=<\/span> \"2.12.5\"<\/span>\r\n\r\nlibraryDependencies<\/span> ++=<\/span> Seq<\/span>(<\/span>\r\n  \"com.typesafe.akka\"<\/span> %%<\/span> \"akka-actor\"<\/span> %<\/span> \"2.5.12\"<\/span>,<\/span>\r\n\r\n  \"com.typesafe.akka\"<\/span> %%<\/span> \"akka-stream\"<\/span> %<\/span> \"2.5.12\"<\/span>,<\/span>\r\n  \"com.typesafe.akka\"<\/span> %%<\/span> \"akka-stream-kafka\"<\/span> %<\/span> \"0.20\"<\/span>,<\/span>\r\n\r\n  \"io.spray\"<\/span> %%<\/span>  \"spray-json\"<\/span> %<\/span> \"1.3.3\"<\/span>\r\n)<\/span>\r\n\r\nmainClass<\/span> in<\/span> Compile<\/span> :=<\/span> Some<\/span>(<\/span>\"com.example.Main\"<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u6d88\u606f\u5bf9\u8c61<\/h1>\n
\u6211\u5011\u9996\u5148\u5b9a\u7fa9\u4e86\u4e00\u500b\u53ef\u4ee5\u9032\u884c\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u7684\u6d88\u606f\u3002<\/p>\n
package<\/span> com.example<\/span>\r\n\r\nimport<\/span> spray.json.<\/span>{<\/span>DefaultJsonProtocol<\/span>,<\/span> RootJsonFormat<\/span>}<\/span>\r\n\r\nobject<\/span> Message<\/span> {<\/span>\r\n\r\n  \/\/ \u9001\u4fe1\u30e1\u30c3\u30bb\u30fc\u30b8<\/span>\r\n  final<\/span> case<\/span> class<\/span> SendMessage<\/span>(<\/span>message<\/span>:<\/span> String<\/span>,<\/span> timestamp<\/span>:<\/span> Long<\/span>)<\/span>\r\n\r\n  \/\/ \u53d7\u4fe1\u30e1\u30c3\u30bb\u30fc\u30b8<\/span>\r\n  final<\/span> case<\/span> class<\/span> ConsumedMessage<\/span>(<\/span>message<\/span>:<\/span> String<\/span>,<\/span> timestamp<\/span>:<\/span> Long<\/span>)<\/span>\r\n\r\n}<\/span>\r\n\r\n\/\/ \u30e1\u30c3\u30bb\u30fc\u30b8 <-> json<\/span>\r\ntrait<\/span> MessageJsonProtocol<\/span> extends<\/span> DefaultJsonProtocol<\/span> {<\/span>\r\n\r\n  import<\/span> Message._<\/span>\r\n\r\n  implicit<\/span> val<\/span> sendMessageFormat<\/span>:<\/span> RootJsonFormat<\/span>[<\/span>SendMessage<\/span>]<\/span> =<\/span> jsonFormat2<\/span>(<\/span>SendMessage<\/span>)<\/span>\r\n  implicit<\/span> val<\/span> consumedMessageFormat<\/span>:<\/span> RootJsonFormat<\/span>[<\/span>ConsumedMessage<\/span>]<\/span> =<\/span> jsonFormat2<\/span>(<\/span>ConsumedMessage<\/span>)<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5236\u7247\u4eba<\/h1>\n
\u6211\u8bd5\u7740\u4ece\u5236\u7247\u4eba\u7684\u89d2\u5ea6\u5199\u4e00\u4e0b\u3002<\/p>\n
package<\/span> com.example<\/span>\r\n\r\n\/\/ import\u7701\u7565<\/span>\r\n\r\nobject<\/span> Main<\/span> extends<\/span> App<\/span> with<\/span> MessageJsonProtocol<\/span> {<\/span>\r\n\r\n  import<\/span> Message._<\/span>\r\n\r\n  implicit<\/span> val<\/span> system<\/span>:<\/span> ActorSystem<\/span> =<\/span> ActorSystem<\/span>(<\/span>\"kafka-example\"<\/span>)<\/span>\r\n  implicit<\/span> val<\/span> materializer<\/span>:<\/span> ActorMaterializer<\/span> =<\/span> ActorMaterializer<\/span>()<\/span>\r\n  implicit<\/span> val<\/span> executor<\/span>:<\/span> ExecutionContext<\/span> =<\/span> system<\/span>.<\/span>dispatcher<\/span>\r\n\r\n  val<\/span> conf<\/span> =<\/span> ConfigFactory<\/span>.<\/span>load<\/span>()<\/span>\r\n  val<\/span> bootstrapServers<\/span> =<\/span> conf<\/span>.<\/span>getString<\/span>(<\/span>\"kafka.bootstrapServers\"<\/span>)<\/span>\r\n\r\n  \/\/ \u30d7\u30ed\u30c7\u30e5\u30fc\u30b5\u30fc\u8a2d\u5b9a<\/span>\r\n  val<\/span> producerSettings<\/span> =<\/span> ProducerSettings<\/span>(<\/span>system<\/span>,<\/span> new<\/span> StringSerializer<\/span>,<\/span> new<\/span> StringSerializer<\/span>)<\/span>\r\n    .<\/span>withBootstrapServers<\/span>(<\/span>bootstrapServers<\/span>)<\/span>\r\n\r\n  \/\/ \u30d7\u30ed\u30c7\u30e5\u30fc\u30b5\u30fcstream<\/span>\r\n  val<\/span> (<\/span>pKillSwitch<\/span>,<\/span> pDone<\/span>)<\/span> =<\/span> Source<\/span>\r\n    .<\/span>tick<\/span>(<\/span>1.<\/span>seconds<\/span>,<\/span> 10.<\/span>seconds<\/span>,<\/span> None<\/span>)<\/span>\r\n    .<\/span>viaMat<\/span>(<\/span>KillSwitches<\/span>.<\/span>single<\/span>)(<\/span>Keep<\/span>.<\/span>right<\/span>)<\/span>\r\n    .<\/span>map<\/span> {<\/span> _<\/span> =><\/span>\r\n      val<\/span> msg<\/span> =<\/span> SendMessage<\/span>(<\/span>\"Hello\"<\/span>,<\/span> ZonedDateTime<\/span>.<\/span>now<\/span>().<\/span>toEpochSecond<\/span>)<\/span>\r\n      ProducerMessage<\/span>.<\/span>Message<\/span>(<\/span>new<\/span> ProducerRecord<\/span>[<\/span>String<\/span>, String<\/span>](<\/span>\"test.B\"<\/span>,<\/span> msg<\/span>.<\/span>toJson<\/span>.<\/span>compactPrint<\/span>),<\/span>\r\n                              None<\/span>)<\/span>\r\n    }<\/span>\r\n    .<\/span>via<\/span>(<\/span>Producer<\/span>.<\/span>flow<\/span>(<\/span>producerSettings<\/span>))<\/span>\r\n    .<\/span>map<\/span> {<\/span> result<\/span> =><\/span>\r\n      println<\/span>(<\/span>s<\/span>\"success send. message: ${result.message.record.value()}\"<\/span>)<\/span>\r\n      result<\/span>\r\n    }<\/span>\r\n    .<\/span>toMat<\/span>(<\/span>Sink<\/span>.<\/span>ignore<\/span>)(<\/span>Keep<\/span>.<\/span>both<\/span>)<\/span>\r\n    .<\/span>run<\/span>()<\/span>\r\n\r\n  pDone<\/span>.<\/span>onComplete<\/span> {<\/span>\r\n    case<\/span> Success<\/span>(<\/span>_<\/span>)<\/span> =><\/span>\r\n      println<\/span>(<\/span>\"done producer.\"<\/span>)<\/span>\r\n    case<\/span> Failure<\/span>(<\/span>ex<\/span>)<\/span> =><\/span>\r\n      println<\/span>(<\/span>s<\/span>\"fail send. reason: ${ex.getMessage}\"<\/span>)<\/span>\r\n  }<\/span>\r\n\r\n  println<\/span>(<\/span>\"start\"<\/span>)<\/span>\r\n\r\n  StdIn<\/span>.<\/span>readLine<\/span>()<\/span>\r\n\r\n  pKillSwitch<\/span>.<\/span>shutdown<\/span>()<\/span>\r\n\r\n  println<\/span>(<\/span>\"end\"<\/span>)<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
Kafka\u670d\u52a1\u5668\u5730\u5740\u662f\u4ece”application.conf”\u4e2d\u83b7\u53d6\u7684\u3002
\n\u6bcf10\u79d2\uff0c\u6d41\u4f1a\u751f\u6210\u5e76\u53d1\u9001\u6d88\u606f\u3002
\n\u6839\u636e\u8fd9\u4e9b\u53c2\u8003\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u6d41\u7684KillSwitch\u3002\u5982\u679c\u53d1\u751f\u5f02\u5e38\uff0c\u5e94\u8be5\u4f1a\u8fdb\u5165\u5230onComplete\u4e2d…\u3002<\/p>\n
\u6d88\u8d39\u8005<\/h1>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4f1a\u5199\u5173\u4e8e\u6d88\u8d39\u8005\u7684\u5185\u5bb9\u3002<\/p>\n
package<\/span> com.example<\/span>\r\n\r\n\/\/ import\u7701\u7565<\/span>\r\n\r\nobject<\/span> Main<\/span> extends<\/span> App<\/span> with<\/span> MessageJsonProtocol<\/span> {<\/span>\r\n\r\n  import<\/span> Message._<\/span>\r\n\r\n  implicit<\/span> val<\/span> system<\/span>:<\/span> ActorSystem<\/span> =<\/span> ActorSystem<\/span>(<\/span>\"kafka-example\"<\/span>)<\/span>\r\n  implicit<\/span> val<\/span> materializer<\/span>:<\/span> ActorMaterializer<\/span> =<\/span> ActorMaterializer<\/span>()<\/span>\r\n  implicit<\/span> val<\/span> executor<\/span>:<\/span> ExecutionContext<\/span> =<\/span> system<\/span>.<\/span>dispatcher<\/span>\r\n\r\n  val<\/span> conf<\/span> =<\/span> ConfigFactory<\/span>.<\/span>load<\/span>()<\/span>\r\n  val<\/span> bootstrapServers<\/span> =<\/span> conf<\/span>.<\/span>getString<\/span>(<\/span>\"kafka.bootstrapServers\"<\/span>)<\/span>\r\n\r\n  \/\/ \u30b3\u30f3\u30b7\u30e5\u30fc\u30de\u30fc\u8a2d\u5b9a<\/span>\r\n  val<\/span> consumerSettings<\/span> =<\/span> ConsumerSettings<\/span>(<\/span>system<\/span>,<\/span> new<\/span> StringDeserializer<\/span>,<\/span> new<\/span> StringDeserializer<\/span>)<\/span>\r\n    .<\/span>withBootstrapServers<\/span>(<\/span>bootstrapServers<\/span>)<\/span>\r\n    .<\/span>withGroupId<\/span>(<\/span>\"test\"<\/span>)<\/span>\r\n    .<\/span>withProperty<\/span>(<\/span>ConsumerConfig<\/span>.<\/span>AUTO_OFFSET_RESET_CONFIG<\/span>,<\/span> \"earliest\"<\/span>)<\/span>\r\n\r\n  \/\/ \u30b3\u30f3\u30b7\u30e5\u30fc\u30de\u30fcstream<\/span>\r\n  val<\/span> (<\/span>cKillSwitch<\/span>,<\/span> cDone<\/span>)<\/span> =<\/span> Consumer<\/span>\r\n    .<\/span>committableSource<\/span>(<\/span>consumerSettings<\/span>,<\/span> Subscriptions<\/span>.<\/span>topics<\/span>(<\/span>\"test.B\"<\/span>))<\/span>\r\n    .<\/span>viaMat<\/span>(<\/span>KillSwitches<\/span>.<\/span>single<\/span>)(<\/span>Keep<\/span>.<\/span>right<\/span>)<\/span>\r\n    .<\/span>map<\/span> {<\/span> consumed<\/span> =><\/span>\r\n      val<\/span> msg<\/span> =<\/span> consumed<\/span>.<\/span>record<\/span>.<\/span>value<\/span>().<\/span>parseJson<\/span>.<\/span>convertTo<\/span>[<\/span>ConsumedMessage<\/span>]<\/span>\r\n      println<\/span>(<\/span>s<\/span>\"consumed. message: ${msg.message}\"<\/span>)<\/span>\r\n      consumed<\/span>\r\n    }<\/span>\r\n    .<\/span>mapAsync<\/span>(<\/span>1<\/span>)<\/span> {<\/span> msg<\/span> =><\/span>\r\n      msg<\/span>.<\/span>committableOffset<\/span>.<\/span>commitScaladsl<\/span>()<\/span>\r\n    }<\/span>\r\n    .<\/span>toMat<\/span>(<\/span>Sink<\/span>.<\/span>ignore<\/span>)(<\/span>Keep<\/span>.<\/span>both<\/span>)<\/span>\r\n    .<\/span>run<\/span>()<\/span>\r\n\r\n  cDone<\/span>.<\/span>onComplete<\/span> {<\/span>\r\n    case<\/span> Success<\/span>(<\/span>_<\/span>)<\/span> =><\/span>\r\n      println<\/span>(<\/span>\"done consumer.\"<\/span>)<\/span>\r\n    case<\/span> Failure<\/span>(<\/span>ex<\/span>)<\/span> =><\/span>\r\n      println<\/span>(<\/span>s<\/span>\"fail consume. reason: ${ex.getMessage}\"<\/span>)<\/span>\r\n  }<\/span>\r\n\r\n  println<\/span>(<\/span>\"start\"<\/span>)<\/span>\r\n\r\n  StdIn<\/span>.<\/span>readLine<\/span>()<\/span>\r\n\r\n  cKillSwitch<\/span>.<\/span>shutdown<\/span>()<\/span>\r\n\r\n  println<\/span>(<\/span>\"end\"<\/span>)<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7531\u4e8e\u5927\u4f53\u4e0e\u5236\u7247\u4eba\u76f8\u540c\uff0c\u6240\u4ee5\u6ca1\u6709\u7279\u522b\u9700\u8981\u8bf4\u7684\u3002
\n\u53ea\u8981\u6d41\u4e0d\u505c\u6b62\uff0c\u5b83\u5c31\u4f1a\u81ea\u52a8\u8fde\u63a5\u5230Kafka\u5e76\u63a5\u6536\u6307\u5b9a\u4e3b\u9898\u7684\u6570\u636e\u3002<\/p>\n
\u8fdb\u884c\u6267\u884c<\/h1>\n
\u5c06\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005\u7ec4\u5408\u5728\u4e00\u8d77\uff08Main.scala\uff09\uff0c\u6784\u5efa\u548c\u6267\u884c\uff0c\u5e94\u8be5\u4f1a\u4ea7\u751f\u4ee5\u4e0b\u8f93\u51fa\uff08\u5df2\u5220\u9664Actor\u7cfb\u5217\u7684\u8b66\u544a\uff09\u3002<\/p>\n
start\r\nsuccess send. message: {\"message\":\"Hello\",\"timestamp\":1523958246}\r\nsuccess consume. message: Hello, timestamp: 1523958246\r\nsuccess send. message: {\"message\":\"Hello\",\"timestamp\":1523958256}\r\nsuccess consume. message: Hello, timestamp: 1523958256\r\nsuccess send. message: {\"message\":\"Hello\",\"timestamp\":1523958266}\r\nsuccess consume. message: Hello, timestamp: 1523958266\r\nend\r\n<\/span><\/code><\/pre>\n
\u7ed3\u675f<\/h1>\n
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