task

问题 I was reading the documentation for the class Task final Task<Void> task = new Task<Void>() { @Override public Void call() { for(int i=0;i<datesAndStudies.length;i++){ updateProgress(i,datesAndStudies.length); DoSomething something = new DoSomething(); something.VeryLongAndTimeConsumingMethod(i); } return null; } }; And I notice that updateProgress is protected and workdone/totalwork are both defined as public final ReadOnlyDoubleProperty . Is there a way/workaround to update/call

问题 I understand there's a TPL deadlock trap when calling async method within a sync MVC method, while using .Wait() or .Result to wait till the task complete. But we just found a strange behaviour in our MVC application: The sync action calls an async method, but since it's a trigger, we never waited it complete. Still, the async method seems stucked. Code is like below, this strange issue not 100% happens. It just happens sometime. When it happens: The HomeController.Index() action completed

问题 What is the purpose of TaskExecutor in spring. What problem does it solve ? How is it different from Executors in java concurrent package ? 回答1: From http://static.springsource.org/spring/docs/2.0.8/reference/scheduling.html 23.4. The Spring TaskExecutor abstraction ... Spring's TaskExecutor interface is identical to the java.util.concurrent.Executor interface. In fact, its primary reason for existence is to abstract away the need for Java 5 when using thread pools. The interface has a single

问题 Typically, I do the following public static async Task dosth() { List<Task> job = new List<Task>(); for (int i = 0; i < 3; i++) { job.Add(sleep()); } Task.WhenAll(job.ToArray()); } static async Task sleep() { await Task.Delay(1000); Console.WriteLine("Finish new"); } It works smoothly, no problem. But when I do a review on my own code (trying using other syntax to do the same job), I suddenly figure out the following two are different. public static async Task dosthA() { //This will be

问题 On my web server (ASP.NET MVC 4) I am calling web services (asmx) on another server. I have generated client from WSDL. There are sync methods and async methods (callbacks, not Tasks). I transform it to task oriented call (with TaskCompletionSource ) and then i call await like this: public async Task<DataObject> GetData() { var tcs = new TaskCompletionSource<DataObject>(); var client = new WebServiceClient(); client.GetDataCompleted += (sender, args) => tcs.SetResult(args.Result); client

问题 Can anyone supply me with simple working examples which illustrate the use of pragmas in Ada 2005 ? I understand that pragmas are used to priorities processes, just that I have not come across working examples ! Much appreciated ! 回答1: A search of comp.lang.ada for recent discussions about priorities has several interesting examples. This one seems particularly apropos to your question. Addendum: Two other exemplary sources are the Rationale for Ada 95 and Rationale for Ada 2005 回答2: An Ada

问题 I'm trying to write a simple elixir program that is able to react to user input. My problem is that reading from stdio doesn't seem to work from Tasks. If my whole idea is silly please show me an example on how it's done. I can't find anything in the web I broke my problem down to a simple example: t = Task.async((fn->IO.gets "what?" end)) %Task{owner: #PID<0.65.0>, pid: #PID<0.80.0>, ref: #Reference<0.0.2.135>} The Task is started: iex(4)> pid=Map.get(t, :pid) #PID<0.80.0> iex(5)> Process

问题 I don't know exactly why, but I am getting duplicated tasks. I thing this may be related with time change of the last weekend (The clock was delayed for an hour in the system). The first task should not be executed, since I say explicitly hour=2 . Any idea why this happens? [2017-11-01 01:00:00,001: INFO/Beat] Scheduler: Sending due task every-first-day_month (app.users.views.websites_down) [2017-11-01 02:00:00,007: INFO/Beat] Scheduler: Sending due task every-first-day_month (app.users.views

问题 I have a simple code that finds all prime numbers between 1 and 100000. The problem is, it's not precise. There are 9592 primes between 1 and 100000 but I'm getting values ranging from 9588 to 9592. The code is : List<bool> result = new List<bool>(); Stopwatch watch = Stopwatch.StartNew(); List<Task> tasks = new List<Task>(); for (ulong i = 1; i < 100000; i++) { tasks.Add(Task.Factory.StartNew(number => { var y = (ulong)number; if (y == 1) return false; if (y == 2) return true; for (ulong j =

问题 I don't really understand this. In my code below, run as-is, the exception thrown by token.ThrowIfCancellationRequested() is not being sent back to where Main is using .Wait(), and is instead thrown on the spot with the stacktrace not really knowing where it happened other than "A task was cancelled". However if I remove the async keyword and remove the try catch block with the await Task.Delay(), it does get sent back to .Wait() in main and is caught there. Am I doing something wrong, or how