future

How to configure a fine tuned thread pool for futures?

由 一世执手 提交于 2019-12-17 07:02:10
问题 How large is Scala's thread pool for futures? My Scala application makes many millions of future {} s and I wonder if there is anything I can do to optimize them by configuring a thread pool. Thank you. 回答1: You can specify your own ExecutionContext that your futures will run in, instead of importing the global implicit ExecutionContext. import java.util.concurrent.Executors import scala.concurrent._ implicit val ec = new ExecutionContext { val threadPool = Executors.newFixedThreadPool(1000)

Scala: List[Future] to Future[List] disregarding failed futures

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-17 07:01:10
问题 I'm looking for a way to convert an arbitrary length list of Futures to a Future of List. I'm using Playframework, so ultimately, what I really want is a Future[Result] , but to make things simpler, let's just say Future[List[Int]] The normal way to do this would be to use Future.sequence(...) but there's a twist... The list I'm given usually has around 10-20 futures in it, and it's not uncommon for one of those futures to fail (they are making external web service requests). Instead of

How to use invokeAll() to let all thread pool do their task?

由 谁都会走 提交于 2019-12-17 06:36:07
问题 ExecutorService pool=Executors.newFixedThreadPool(7); List<Future<Hotel>> future=new ArrayList<Future<Hotel>>(); List<Callable<Hotel>> callList = new ArrayList<Callable<Hotel>>(); for(int i=0;i<=diff;i++){ String str="2013-"+(liDates.get(i).get(Calendar.MONTH)+1)+"-"+liDates.get(i).get(Calendar.DATE); callList.add(new HotelCheapestFare(str)); } future=pool.invokeAll(callList); for(int i=0;i<=future.size();i++){ System.out.println("name is:"+future.get(i).get().getName()); } Now I want pool to

Is there a way to cancel/detach a future in C++11?

由 落爺英雄遲暮 提交于 2019-12-17 06:35:21
问题 I have the following code: #include <iostream> #include <future> #include <chrono> #include <thread> using namespace std; int sleep_10s() { this_thread::sleep_for(chrono::seconds(10)); cout << "Sleeping Done\n"; return 3; } int main() { auto result=async(launch::async, sleep_10s); auto status=result.wait_for(chrono::seconds(1)); if (status==future_status::ready) cout << "Success" << result.get() << "\n"; else cout << "Timeout\n"; } This is supposed to wait 1 second, print "Timeout", and exit.

python的__future__模块

由 隐身守侯 提交于 2019-12-16 22:02:26
作用 __future__模块提供某些将要引入的特性 2.7.5的__future__ 基本上是python3中的特性 有以下内容 In [1]: import __future__ In [2]: __future__. __future__.CO_FUTURE_ABSOLUTE_IMPORT __future__.all_feature_names __future__.CO_FUTURE_DIVISION __future__.division __future__.CO_FUTURE_PRINT_FUNCTION __future__.generators __future__.CO_FUTURE_UNICODE_LITERALS __future__.nested_scopes __future__.CO_FUTURE_WITH_STATEMENT __future__.print_function __future__.CO_GENERATOR_ALLOWED __future__.unicode_literals __future__.CO_NESTED __future__.with_statement __future__.absolute_import In [2]: __future__. 可导入的功能有哪些？ In [3]: import __future_

Why Future thread doesn't work in background of application?

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-14 02:41:06
问题 Today I found a wierd problem. What I want is to check server availability (Particularly SSL checking) once application started and display proper message if server is down. This process should work in background and user is able to navigate the app if server has problem (app can works offline). What I did is simple. In main activity I have @Override protected void onStart() { super.onStart(); // Check Internet connection // Check Location sensor // Check server accessibility BackendCheck

future waits for execution on single-core machine

由 别等时光非礼了梦想. 提交于 2019-12-14 02:35:48
问题 I have 2 machines with identical versions of Ubuntu (16.04), R (3.4.4) and the future package (1.10.0). I am running the code below, that implements asyncronous programming tic() library(future) plan(multisession) mehAsync = function(){ future::future({ Sys.sleep(5) return('meh') }) } out = mehAsync() what = then(out,function(value){(value)}) toc() The expected behaviour is that the execution will end almost instantly, leaving what to be a pending promise. In one machine this happens, the

Scala ProcessLogger & Future: How can I make sure all line callbacks are called BEFORE the onComplete block?

由 不打扰是莪最后的温柔 提交于 2019-12-13 20:01:11
问题 import scala.sys.process._ import scala.concurrent._ // (future) import ExecutionContext.Implicits.global // (future) /* run "ls /opt" * which outputs 2 lines: * - "X11" * - "local" */ val command = Process(Seq("ls", "/opt"), None, "LANG" -> "") val process = command.run(ProcessLogger(line => { Thread.sleep(1000) // slow execution down println(Thread.currentThread) println(line) println("") })) Future { process.exitValue // blocks until the process exits }.onComplete { results => println

Rx Java Observable execute until some condition

由 青春壹個敷衍的年華 提交于 2019-12-13 15:17:48
问题 I am trying to find a way to execute observable until some condition is met. Consider the following example: myDelayedObservable = createListenerObserver(); public Observable<Boolean> createListenerObserver() { // The part I am looking for } ViewTreeObserver.OnGlobalLayoutListener listenerLayout = new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { myDelayedObservable.onCompleted(); getTargetView().getViewTreeObserver().removeGlobalOnLayoutListener(this);

event fired by a future loaded element [duplicate]

由 陌路散爱 提交于 2019-12-13 09:45:15
问题 This question already has answers here : jQuery .on function for future elements, as .live is deprecated [duplicate] (2 answers) Closed 6 years ago . I have a form thats loads an image. I need to do a function that is been called by the image Onclick Event. The problem is that the selector ( I'm using jQuery) can't find the image id, because when the function is loaded the image wasn't yet there. SOLUTION : After the image upload --> $("#"+foto_nom).bind({ click:function(){ alert(this.id); }
订阅 future