I have a Node.js/Express app that queries a MySQL db within the route and displays the result to the user. My problem is how do I run the queries and block until both queries are done before redirecting the user to the page they requested? In my example I have 2 queries that need to … Read more
I have an asynchronous operation that for various reasons needs to be triggered using an HTTP call to an ASP.NET web page. When my page is requested, it should start this operation and immediately return an acknowledgment to the client. This method is also exposed via a WCF web service, and it works perfectly. On … Read more
I have a collection of 1000 input message to process. I’m looping the input collection and starting the new task for each message to get processed. //Assume this messages collection contains 1000 items var messages = new List<string>(); foreach (var msg in messages) { Task.Factory.StartNew(() => { Process(msg); }); } Can we guess how many … Read more
How can I find out if a function or method is a normal function or an async function? I would like my code to automatically support normal or async callbacks and need a way to test what type of function is passed. async def exampleAsyncCb(): pass def exampleNomralCb(): pass def isAsync(someFunc): #do cool dynamic python … Read more
I am using ajax and asp.net. iI have a javascript function which creates many other javascript functions with setTimeout. After asynchronous postback happenes, I want to disable all of these setTimeouted events. How can I do that? Answer If you can’t get access to the code where the timer is set Nick’s answer may not … Read more
Does anyone know if there is any difference between doing Task.Factory.StartNew vs new Task followed by calling Start on the task. Looking at reflector there doesn’t seem to be much difference. So perhaps the only difference is that Task.Factory.StartNewreturns a task that is already started. Is this correct? I know that Task.Factory.StartNewand Task.Run have different … Read more
You have the asynchronous versions of read and write (begin/end functions), but not of delete (that I can tell). Is there any reason for this? Isn’t there as much reason to do delete asynchronously as read/write? Using threading to simulate asynchronous behavior is not the same as asynchronous functions. Big difference, sure you get the … Read more
I’m trying to wrap my head around the TPL, the new async / await features in C# 5, and the mysteries of TaskCompletionSource. One thing that isn’t clear to me is when to use SetResult, SetException, and SetCancel versus TrySetResult, TrySetException and TrySetCancel. This is what MSDN has to say: This operation will return false … Read more
How can one add a new coroutine to a running asyncio loop? Ie. one that is already executing a set of coroutines. I guess as a workaround one could wait for existing coroutines to complete and then initialize a new loop (with the additional coroutine). But is there a better way? Answer You can use … Read more
I am working with some code, where I have 2 classes with very similar logic and code. I have protected async void LoadDataAsync() method on both classes. Currently I am refactoring it and thinking to move shared logic to base class. Is it OK to have virtual async method on base class and override it … Read more
