+ KTable<String, String> users = builder.table(properties.getUsersInputTopic());
+ KStream<String, String> rankings = builder.stream(properties.getRankingInputTopic());
+
+ rankings
+ .join(users, (rankingJson, userJson) ->
+ {
+ try
+ {
+ Ranking ranking = mapper.readValue(rankingJson, Ranking.class);
+ User user = mapper.readValue(userJson, User.class);
+
+ return mapper.writeValueAsString(
+ UserRanking.of(
+ user.getFirstName(),
+ user.getLastName(),
+ ranking.getEntries()));
+ }
+ catch (JsonProcessingException e)
+ {
+ throw new RuntimeException(e);
+ }
+ })
+ .toTable(Materialized.as(storeName));