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
  16 import java.util.*;
  17
  18
  19 @Slf4j
  20 public class TestListener
  21 {
  22   static final ParameterizedTypeReference<ServerSentEvent<String>> SSE_TYPE = new ParameterizedTypeReference<>() {};
  23
  24
  25   public Flux<MessageTo> run()
  26   {
  27     return Flux
  28         .fromArray(chatRooms)
  29         .flatMap(chatRoom ->
  30         {
  31           log.info("Requesting messages for chat-room {}", chatRoom);
  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 -> list.add(message))
  47               .doOnComplete(() -> log.info("{} was completed!", chatRoom))
  48               .doOnError(throwalbe -> log.error("{} failed: {}", chatRoom, throwalbe));
  49         });
  50   }
  51
  52   Flux<ServerSentEvent<String>> receiveMessages(ChatRoomInfoTo chatRoom)
  53   {
  54     return webClient
  55         .get()
  56         .uri(
  57             "/{chatRoomId}/listen",
  58             chatRoom.getId())
  59         .accept(MediaType.TEXT_EVENT_STREAM)
  60         .retrieve()
  61         .bodyToFlux(SSE_TYPE);
  62   }
  63
  64
  65   private final WebClient webClient;
  66   private final ChatRoomInfoTo[] chatRooms;
  67   private final ObjectMapper objectMapper;
  68
  69   final Map<UUID, List<MessageTo>> receivedMessages = new HashMap<>();
  70
  71
  72   TestListener(Integer port, ChatRoomInfoTo[] chatRooms)
  73   {
  74     webClient = WebClient.create("http://localhost:" + port);
  75     this.chatRooms = chatRooms;
  76     objectMapper = new ObjectMapper();
  77     objectMapper.registerModule(new JavaTimeModule());
  78     objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
  79   }
  80 }