Structured Concurrency in Practice: CoroutineScope vs StructuredTaskScope [Part 3]

This post series assumes familiarity with Kotlin, Java, and Spring Boot. No AI was used during the writing of this post series. What happened to our logs? In Part 2 we completed the entire solution, both the happy path and the sad paths. Here's what we ended up with: @RestController @RequestMapping("/books") class BooksController( private val booksRepository: BooksRepository, private val reviewsService: ReviewsService, ) { private val log = LoggerFactory.getLogger(BooksController::class.java) @GetMapping("/{id}") fun fetchBook(@PathVariable id: Long): Book = runBlocking(Dispatchers.IO) { log.info("[START] $id") val book = async { findBook(id) } val reviews = async { fetchReviewsFor(id) } book.await() .copy(reviews = reviews.await()) .also { log.info("[SUCCESS] Returning ${it.id}") } } private suspend fun findBook(id: Long) = runInterruptible { booksRepository.findById(id) ?: throw BookNotFoundException(id) } private suspend fun fetchReviewsFor(id: Long) = runInterruptible { reviewsServ