juplo.de Git - demos/kafka/chat/blob - src/test/java/de/juplo/kafka/chat/backend/TestWriter.java

   1 package de.juplo.kafka.chat.backend;
   2
   3 import de.juplo.kafka.chat.backend.api.ChatRoomInfoTo;
   4 import de.juplo.kafka.chat.backend.api.MessageTo;
   5 import lombok.extern.slf4j.Slf4j;
   6 import org.springframework.http.HttpStatus;
   7 import org.springframework.http.MediaType;
   8 import org.springframework.web.reactive.function.client.WebClient;
   9 import org.springframework.web.reactive.function.client.WebClientResponseException;
  10 import reactor.core.publisher.Mono;
  11 import reactor.util.retry.Retry;
  12
  13 import java.nio.charset.Charset;
  14 import java.time.Duration;
  15 import java.util.concurrent.ThreadLocalRandom;
  16
  17
  18 @Slf4j
  19 public class TestWriter implements Runnable
  20 {
  21   @Override
  22   public void run()
  23   {
  24     for (int i = 0; running; i++)
  25     {
  26       String message = "Message #" + i;
  27       try
  28       {
  29         sendMessage(chatRoom, message)
  30             .retryWhen(Retry.fixedDelay(10, Duration.ofSeconds(1)))
  31             .map(MessageTo::toString)
  32             .onErrorResume(throwable ->
  33             {
  34               WebClientResponseException e = (WebClientResponseException)throwable.getCause();
  35               return Mono.just(e.getResponseBodyAsString(Charset.defaultCharset()));
  36             })
  37             .subscribe(result -> log.info(
  38                 "{} sent a message to {}: {}",
  39                 user,
  40                 chatRoom,
  41                 result));
  42
  43         Thread.sleep(ThreadLocalRandom.current().nextLong(700, 1000));
  44       }
  45       catch (Exception e)
  46       {
  47         throw new RuntimeException(e);
  48       }
  49     }
  50   }
  51
  52   private Mono<MessageTo> sendMessage(
  53       ChatRoomInfoTo chatRoom,
  54       String message)
  55   {
  56     return webClient
  57         .put()
  58         .uri(
  59             "/{chatRoomId}/{username}/{serial}",
  60             chatRoom.getId(),
  61             user.getName(),
  62             user.nextSerial())
  63         .contentType(MediaType.TEXT_PLAIN)
  64         .accept(MediaType.APPLICATION_JSON)
  65         .bodyValue(message)
  66         .exchangeToMono(response ->
  67         {
  68           if (response.statusCode().equals(HttpStatus.OK))
  69           {
  70             return response.bodyToMono(MessageTo.class);
  71           }
  72           else
  73           {
  74             return response.createError();
  75           }
  76         });
  77   }
  78
  79
  80   private final WebClient webClient;
  81   private final ChatRoomInfoTo chatRoom;
  82   private final User user;
  83
  84   volatile boolean running = true;
  85
  86
  87   TestWriter(Integer port, ChatRoomInfoTo chatRoom, String username)
  88   {
  89     webClient = WebClient.create("http://localhost:" + port);
  90     this.chatRoom = chatRoom;
  91     user = new User(username);
  92   }
  93 }