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.Flux;
  11 import reactor.core.publisher.Mono;
  12 import reactor.util.retry.Retry;
  13
  14 import java.nio.charset.Charset;
  15 import java.time.Duration;
  16 import java.util.Iterator;
  17 import java.util.LinkedList;
  18 import java.util.List;
  19 import java.util.concurrent.ThreadLocalRandom;
  20
  21
  22 @Slf4j
  23 public class TestWriter implements Runnable
  24 {
  25   @Override
  26   public void run()
  27   {
  28     Flux
  29         .fromIterable((Iterable<Integer>) () -> new Iterator<>()
  30         {
  31           private int i = 0;
  32
  33           @Override
  34           public boolean hasNext()
  35           {
  36             return running;
  37           }
  38
  39           @Override
  40           public Integer next()
  41           {
  42             return i++;
  43           }
  44         })
  45         .map(i -> "Message #" + i)
  46         .flatMap(message -> sendMessage(chatRoom, message)
  47             .delayElement(Duration.ofMillis(ThreadLocalRandom.current().nextLong(500, 1500)))
  48             .retryWhen(Retry.fixedDelay(10, Duration.ofSeconds(1))))
  49         .doOnNext(message ->
  50         {
  51           sentMessages.add(message);
  52           log.info(
  53               "{} sent a message to {}: {}",
  54              user,
  55              chatRoom,
  56              message);
  57         })
  58         .doOnError(throwable ->
  59         {
  60           WebClientResponseException e = (WebClientResponseException)throwable.getCause();
  61           log.error(
  62               "{} failed sending a message: {}",
  63               user,
  64               e.getResponseBodyAsString(Charset.defaultCharset()));
  65         })
  66         .then()
  67         .block();
  68   }
  69
  70   private Mono<MessageTo> sendMessage(
  71       ChatRoomInfoTo chatRoom,
  72       String message)
  73   {
  74     return webClient
  75         .put()
  76         .uri(
  77             "/{chatRoomId}/{username}/{serial}",
  78             chatRoom.getId(),
  79             user.getName(),
  80             user.nextSerial())
  81         .contentType(MediaType.TEXT_PLAIN)
  82         .accept(MediaType.APPLICATION_JSON)
  83         .bodyValue(message)
  84         .exchangeToMono(response ->
  85         {
  86           if (response.statusCode().equals(HttpStatus.OK))
  87           {
  88             return response.bodyToMono(MessageTo.class);
  89           }
  90           else
  91           {
  92             return response.createError();
  93           }
  94         });
  95   }
  96
  97
  98   private final WebClient webClient;
  99   private final ChatRoomInfoTo chatRoom;
 100   private final User user;
 101
 102   final List<MessageTo> sentMessages = new LinkedList<>();
 103
 104   volatile boolean running = true;
 105
 106
 107   TestWriter(Integer port, ChatRoomInfoTo chatRoom, String username)
 108   {
 109     webClient = WebClient.create("http://localhost:" + port);
 110     this.chatRoom = chatRoom;
 111     user = new User(username);
 112   }
 113 }