public List<String> findPriceParallel(String product) {
return shops
.parallelStream()
.map(shop -> shop.getPrice(product))
.map(Quote::parse)
.map(Discount::applyDiscount)
.collect(Collectors.<String>toList());
}
public List<String> findPrice(String product) {
List<CompletableFuture<String>> priceFutures =
findPriceStream(product).collect(Collectors.<CompletableFuture<String>>toList());
return priceFutures.stream().map(CompletableFuture::join).collect(Collectors.<String>toList());
}