Akka Java文件IO节流

Question

我想将文件内容逐行传送给Actor。我有类似的东西：

final ActorSystem system = ActorSystem.create("stream_system"); 
final Materializer materializer = ActorMaterializer.create(system); 
final ActorRef actor = system.actorOf(Props.create(streamActor.class), "sink"); 

final Path file = Paths.get("path/file.txt"); 

Sink<ByteString, CompletionStage<Done>> printlnSink = 
     Sink.<ByteString> foreach(chunk -> actor.tell(chunk.utf8String(), null)); 
     //Sink.<ByteString> actorRef(actor, null); 

CompletionStage<IOResult> ioResult = 
     FileIO.fromPath(file) 
       .throttle(1, Duration.create(1, TimeUnit.SECONDS), 1, ThrottleMode.shaping()) 
       .to(printlnSink) 
       .run(materializer); 

未注释版本的作品，但它一次性传输整个文件内容。评论版本以“未知”消息结束。

我想逐行发送给Actor，延迟几秒钟。任何帮助如何做到这一点？接收演员只需输入String消息并将其输出。

Answer 1

的Framing类可以帮助您与此：

CompletionStage<IOResult> ioResult = 
    FileIO.fromPath(file) 
      .via(Framing.delimiter(ByteString.fromString(System.lineSeparator()), 1000, FramingTruncation.ALLOW)) 
      .throttle(1, Duration.create(1, TimeUnit.SECONDS), 1, ThrottleMode.shaping()) 
      .to(printlnSink) 
      .run(materializer);