@Test
public void test_findPriceInUSD() {
Shop s1 = shops.get(0);
String product = "MacBook 11";
Future<Double> priceInUSD =
CompletableFuture.supplyAsync(() -> s.getPrice(product))
.thenCombine(
CompletableFuture.supplyAsync(() -> ExchangeService.getRate(USD, FRANC)),
(price, rate) -> price * rate);
}
public Stream<CompletableFuture<String>> findPriceStream(String product) {
return shops
.stream()
.map(shop -> CompletableFuture.supplyAsync(() -> shop.getPrice(product), executor))
.map(future -> future.thenApply(Quote::parse))
.map(
future ->
future.thenCompose(
quote ->
CompletableFuture.supplyAsync(
() -> Discount.applyDiscount(quote), executor)));
}
private static void asyncInCompletableFuture() {
CompletableFuture.supplyAsync(
() -> {
for (int i = 0; i < 1000; ++i) {
if (i % 5 == 0) System.out.println("Doing hard work ....");
}
return new File("/tmp/foo");
})
.thenApply(File::toPath)
.thenAccept(System.out::println);
}