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

   1 package de.juplo.kafka.chat.backend;
   2
   3 import com.fasterxml.jackson.databind.ObjectMapper;
   4 import com.fasterxml.jackson.databind.SerializationFeature;
   5 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
   6 import de.juplo.kafka.chat.backend.api.ChatRoomInfoTo;
   7 import de.juplo.kafka.chat.backend.api.MessageTo;
   8 import lombok.extern.slf4j.Slf4j;
   9 import org.springframework.core.ParameterizedTypeReference;
  10 import org.springframework.http.MediaType;
  11 import org.springframework.http.codec.ServerSentEvent;
  12 import org.springframework.web.reactive.function.client.WebClient;
  13 import reactor.core.publisher.Flux;
  14 import reactor.core.publisher.Mono;
  15 import reactor.core.scheduler.Schedulers;
  16
  17 import java.util.*;
  18
  19
  20 @Slf4j
  21 public class TestListener
  22 {
  23   static final ParameterizedTypeReference<ServerSentEvent<String>> SSE_TYPE = new ParameterizedTypeReference<>() {};
  24
  25
  26   public Mono<Void> run()
  27   {
  28     return Flux
  29         .fromArray(chatRooms)
  30         .flatMap(chatRoom ->
  31         {
  32           List<MessageTo> list = new LinkedList<>();
  33           receivedMessages.put(chatRoom.getId(), list);
  34           return receiveMessages(chatRoom)
  35               .flatMap(sse ->
  36               {
  37                 try
  38                 {
  39                   return Mono.just(objectMapper.readValue(sse.data(), MessageTo.class));
  40                 }
  41                 catch (Exception e)
  42                 {
  43                   return Mono.error(e);
  44                 }
  45               })
  46               .doOnNext(message ->
  47               {
  48                 list.add(message);
  49                 log.info(
  50                     "Received a message from chat-room {}: {}",
  51                     chatRoom,
  52                     message);
  53               })
  54               .take(30);
  55         })
  56         .takeUntil(message -> !running)
  57         .parallel()
  58         .runOn(Schedulers.parallel())
  59         .then();
  60   }
  61
  62   Flux<ServerSentEvent<String>> receiveMessages(ChatRoomInfoTo chatRoom)
  63   {
  64     return webClient
  65         .get()
  66         .uri(
  67             "/{chatRoomId}/listen",
  68             chatRoom.getId())
  69         .accept(MediaType.TEXT_EVENT_STREAM)
  70         .retrieve()
  71         .bodyToFlux(SSE_TYPE);
  72   }
  73
  74
  75   private final WebClient webClient;
  76   private final ChatRoomInfoTo[] chatRooms;
  77   private final ObjectMapper objectMapper;
  78
  79   final Map<UUID, List<MessageTo>> receivedMessages = new HashMap<>();
  80
  81   volatile boolean running = true;
  82
  83
  84   TestListener(Integer port, ChatRoomInfoTo[] chatRooms)
  85   {
  86     webClient = WebClient.create("http://localhost:" + port);
  87     this.chatRooms = chatRooms;
  88     objectMapper = new ObjectMapper();
  89     objectMapper.registerModule(new JavaTimeModule());
  90     objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
  91   }
  92 }