private static <T> FlowFuture<T> _exponentialWithJitter(Flows.SerCallable<FlowFuture<T>> op, RetrySettings settings, int attempt) { Flow f = Flows.currentFlow(); try { FlowFuture<T> future = op.call(); return future.exceptionallyCompose((e) -> { if (attempt < settings.maxAttempts) { long delay_max = (long) Math.min( settings.timeUnit.toMillis(settings.delayMaxDuration), settings.timeUnit.toMillis(settings.delayBaseDuration) * Math.pow(2, attempt)); long delay = new Random().longs(1, 0, delay_max).findFirst().getAsLong(); return f.delay(delay, TimeUnit.MILLISECONDS) .thenCompose((a) -> _exponentialWithJitter(op, settings, attempt + 1)); } else { return f.failedFuture(new RuntimeException()); } }); } catch (Exception ex) { return f.failedFuture(new RuntimeException()); } }
public void book1(TripReq input) { Flow f = Flows.currentFlow(); FlowFuture<BookingRes> flightFuture = f.invokeFunction("./flight/book", input.flight, BookingRes.class); FlowFuture<BookingRes> hotelFuture = f.invokeFunction("./hotel/book", input.hotel, BookingRes.class); FlowFuture<BookingRes> carFuture = f.invokeFunction("./car/book", input.carRental, BookingRes.class); flightFuture.thenCompose( (flightRes) -> hotelFuture.thenCompose( (hotelRes) -> carFuture.whenComplete( (carRes, e) -> EmailReq.sendSuccessMail(flightRes, hotelRes, carRes) ) ) ); }
public void book3(TripReq input) { Flow f = Flows.currentFlow(); FlowFuture<BookingRes> flightFuture = f.invokeFunction("./flight/book", input.flight, BookingRes.class); FlowFuture<BookingRes> hotelFuture = f.invokeFunction("./hotel/book", input.hotel, BookingRes.class); FlowFuture<BookingRes> carFuture = f.invokeFunction("./car/book", input.carRental, BookingRes.class); flightFuture.thenCompose( (flightRes) -> hotelFuture.thenCompose( (hotelRes) -> carFuture.whenComplete( (carRes, e) -> EmailReq.sendSuccessMail(flightRes, hotelRes, carRes) ) .exceptionallyCompose( (e) -> retryCancel("./car/cancel", input.carRental, e) ) ) .exceptionallyCompose( (e) -> retryCancel("./hotel/cancel", input.hotel, e) ) ) .exceptionallyCompose( (e) -> retryCancel("./flight/cancel", input.flight, e) ) .exceptionally( (err) -> {EmailReq.sendFailEmail(); return null;} ); }
public void book2(TripReq input) { Flow f = Flows.currentFlow(); FlowFuture<BookingRes> flightFuture = f.invokeFunction("./flight/book", input.flight, BookingRes.class); FlowFuture<BookingRes> hotelFuture = f.invokeFunction("./hotel/book", input.hotel, BookingRes.class); FlowFuture<BookingRes> carFuture = f.invokeFunction("./car/book", input.carRental, BookingRes.class); flightFuture.thenCompose( (flightRes) -> hotelFuture.thenCompose( (hotelRes) -> carFuture.whenComplete( (carRes, e) -> EmailReq.sendSuccessMail(flightRes, hotelRes, carRes) ) .exceptionallyCompose( (e) -> cancel("./car/cancel", input.carRental, e) ) ) .exceptionallyCompose( (e) -> cancel("./hotel/cancel", input.hotel, e) ) ) .exceptionallyCompose( (e) -> cancel("./flight/cancel", input.flight, e) ) .exceptionally( (err) -> {EmailReq.sendFailEmail(); return null;} ); }