future

Start method at the begin of the month in java

由 て烟熏妆下的殇ゞ 提交于 2019-12-08 10:13:53
问题 for a school project I have to calculate the 'hotItem' of a shoppingbag (which is the most popular item of that month). But I don't know how to call the method (getHotItem) every first day of the month. I've already did some research and found out about Timer and ScheduleExpressions, but from what I learned it is mostly used for a fixed time interval (which is not the case with months of 30 or 31days) Is there a way to call this method at a specific date in the future(every 1st of the month)?

Type mismatch resolving the error type when forwarding messages from a futures channel to a WebSocket Sink

由 我怕爱的太早我们不能终老 提交于 2019-12-08 09:48:43
问题 I'm trying to wrap my head around futures in Rust but I am confused by this code which is supposed to send messages arriving at rx to sink : extern crate futures; extern crate tokio_core; extern crate websocket; use websocket::message::OwnedMessage; use websocket::server::InvalidConnection; use websocket::async::Server; use tokio_core::reactor::Core; use futures::{Future, Sink, Stream}; use futures::sync::mpsc; use std::{thread, time}; use futures::sync::mpsc::Receiver; fn main() { let mut

Underlying thread behavior with Future.get(timeout)

由 女生的网名这么多〃 提交于 2019-12-08 07:37:37
问题 We are using Future with a timeout to accomplish a task. We get a TimeOutException when time limit exceeds. From the behavior of thread dump , I realize that underlying thread continues. Is it the case? How does it take care of multiple threads roaming around? What if no IOException is thrown for the thread which was removed from the pool? If this is true, what is the way to kill underlying thread. It keeps on waiting for an external IO in my case. A part of thread dump: Thread 29587: (state

Expose current progress of an @Asynchronous function to use in View

由 孤者浪人 提交于 2019-12-08 07:18:14
问题 In my JEE6-App (running on Glassfish 3.0.1) I have an EmailEJB which has to send lots of mails. The mails are sent asynchronously, so its annotated with the new EJB3.1 @Asynchronous, letting it be run in a separate Thread. Now i want the user to be informed about the current status of the method: How many mails have already been sent? Sending the mails asynchronously works fine, but i can't figure out how to let the progress be accessible from outside. Seems like my approach to do that is

What is causing data race in std::async here?

由 我是研究僧i 提交于 2019-12-08 06:17:22
问题 I recently created a pattern searching program in Conway's Game of Life, but It ran too slow to be practical. So I decided to parallelize it, but I failed; it caused segmentation fault, which is very likely due to data race. A brief explanation of the code: /* ... */ #include <list> #include <mutex> #include <future> #include <iostream> #include <forward_list> int main() { /* ... */ while (true) { /* ... */ std::forward_list</*pattern type*/> results; std::list<std::future<void>> results

Sequential composition for arbitrary number of calls in Vertx with Futures

由 妖精的绣舞 提交于 2019-12-08 01:35:03
问题 We use Futures in vertx in examples like: Future<JsonObject> fetchVehicle = getUserBookedVehicle(routingContext, client); fetchVehicle.compose(vehicleJson -> vehicleDoor(routingContext, client, vehicleJson, lock)).setHandler( asyncResult -> { if (asyncResult.succeeded()) { LOG.info("Door operation succeeded with result {}", asyncResult.result().encode()); handler.handle(Future.succeededFuture(new AsyncReply(200, "OK"))); } else { handler.handle(Future.failedFuture(asyncResult.cause())); } });

How to terminate CXF webservice call within Callable upon Future cancellation

由 南楼画角 提交于 2019-12-08 01:20:40
问题 Edit This question has gone through a few iterations by now, so feel free to look through the revisions to see some background information on the history and things tried. I'm using a CompletionService together with an ExecutorService and a Callable, to concurrently call the a number of functions on a few different webservices through CXF generated code.. These services all contribute different information towards a single set of information I'm using for my project. The services however can

Akka: What happens when you tell an ActorRef and it expects you to ask?

由 烂漫一生 提交于 2019-12-07 19:26:37
问题 I have the following: val future = myActor ? Message And in my actor my receive message has something like this: sender ! Response If I do the following and ignore the response, is there any negative impact? myActor ! Message Maybe I'm just missing where it says this in the documentation. Is it like a method that returns a value and the caller doesn't assign the return value to anything? If I make that call from another actor is there going to be some weird threading issue or memory leaks

Scala transforming a Seq with Future

由 ￣綄美尐妖づ 提交于 2019-12-07 19:09:12
问题 I have a Seq of a tuple that looks like this: Seq[(Future[Iterable[Type1]], Future[Iterator[Type2]])] I want to transform this into the following: Future[Seq([Iterable[Type1], [Iterable[Type2])] Is this even possible? 回答1: This should do the trick val a: Seq[(Future[Iterable[Type1]], Future[Iterable[Type2]])] = ... val b: Future[Seq[(Iterable[Type1], Iterable[Type2])]] = Future.sequence(a.map{ case (l, r) => l.flatMap(vl => r.map(vr => (vl, vr))) }) 回答2: A bit simpler than Till Rohrmann's

Expose current progress of an @Asynchronous function to use in View

由 孤街浪徒 提交于 2019-12-07 17:55:29
In my JEE6-App (running on Glassfish 3.0.1) I have an EmailEJB which has to send lots of mails. The mails are sent asynchronously, so its annotated with the new EJB3.1 @Asynchronous, letting it be run in a separate Thread. Now i want the user to be informed about the current status of the method: How many mails have already been sent? Sending the mails asynchronously works fine, but i can't figure out how to let the progress be accessible from outside. Seems like my approach to do that is quite wrong, but somehow it has to be possible (maybe another approach). This is how my EmailEJB currently
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