delayed-execution | 易学教程

c# reliable delayed/scheduled execution best practice

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问题 The project I am working on requires some executions to be done at a certain time. I am not sure what would be the best way to deal with this situation. The method must be able to survive server restart/maintenance. And method calls must be programmatically. I am considering going down this path: I could have a table in database (or even a message queue) called TaskTable which could have TaskID(PK), TaskName(varchar), TaskStatus(enum success,failed, scheduled) and TimeOfExecution. But I need

Non-standard evaluation of expressions in S4 context

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问题 This is borrowed from shiny's function exprToFunction which is used in their reactive function. Actual question How can I delay the evaluation of an expression (e.g. specified via arg expr ) in order to "capture" its content when calling a S4 method (as opposed to a standard R function)? Example Note that x_1 does not exist yet, that's why we want to delay the evaluation of expr and just "capture" its content. Function captureExpression : captureExpression <- function( expr, caller_offset = 1

How Can I Pass a Member Function to a Function Pointer?

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问题 class Child; class Parent { public: void (*funcPointer)(); void (*funcPointer2)(Parent* _this); void (Child::*funcPointer3)(); }; class Child: public Parent { public: void TestFunc(){ } void Do(){ Parent p; p.funcPointer=TestFunc; // error, '=': cannot convert from 'void (__thiscall Child::* )(void)' to 'void (__cdecl *)(void)' p.funcPointer2=TestFunc; // error too, '=': cannot convert from 'void (__thiscall Child::* )(void)' to 'void (__cdecl *)(Parent *)' p.funcPointer3=TestFunc; //this

Keydown processes previous character instead of current one

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问题 I try to create an MS-Dos emulation window with jquery and ajax. It works well but when I type a word or press enter, the script is one character too late on display (no character displayed on first press then, for each next keydown, it shows the previous character typed by the user instead of the current one). Here is a simplified version of my script: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <link rel="stylesheet"

Inject external javascript file in html body after page load

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问题 I want to load an external javascript after page is loaded. Actually the javascript contains source for an ad and its making page load slow. All I want is to delay loading & execution of ads to make sure fast page load. thanks, Bilal 回答1: You may just use this script at the last tag of your body block: <script type="text/javascript"> var script = document.createElement('script'); script.setAttribute('src', 'http://yourdomian.com/your_script.js'); script.setAttribute('type', 'text/javascript')

Celery task chain cancelling?

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问题 I found that celery supports task chains: http://celery.readthedocs.org/en/latest/userguide/canvas.html#chains. Question is: how can I stop chain's execution in a task? For example, we got a chain of N items (N > 2). And in the second task we realize that we do not need all the rest tasks to be executed. What to do? 回答1: In newer versions of celery (3.1.6) you can revoke an entire chain by simply walking the chain and revoking each item in turn. # Build a chain for results from tasks import

How to limit rest calls angular

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问题 I am working on a kanban style drag&drop system with ng2-dragula. And I have an issue, and I think it's because every time you drop an item to a new place it sends the data to the server and redo the whole list of items that you can drag around. And if you do it fast enough you can break the drag&drop cycle. Is there a way to limit the intervall you can make an API call? Similar to RxJS debounceTime, but since the list is almost always changing I cannot pipe a filter to it. Basic constructor

jquery/JavaScript - Delay until upload complete

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问题 My jQuery script looks something like (the form is submitting files to upload): $("#addMore").click(function() { $("#progForm").submit(); $("#upTar").css("display","block"); $("#title").val("");$("#obj").val("");$("#theory").val(""); $("#code").val("");$("#output").val("");$("#conc").val(""); }); I want to delay the execution of the code beginning from $("#upTar") until the form submission is completed (that is the files are uploaded and PHP script has responded). Edit #upTar is an iframe and

Android Getting public Bitmap function return before Delay ended

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问题 So, I have a public static Bitmap with a delay of 2000 mils inside of it. My problem is that I get return before code that is getting delayed is executed. To give you the idea of my function structure: public static Bitmap getBitmapFromWebview(WebView webView){ *******************some code here Handler handler = new Handler(); handler.postDelayed(new Runnable() { @Override public void run() { ********************declaring bm bitmap Log.i("DelayD", "Delay"); } }, 2000); Log.i("DelayD", "Return

Delayed Queue implementation in Storm – Kafka, Cassandra, Redis or Beanstalk?

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问题 I have a storm topology to process messages from Kafka and make HTTP call / saves in Cassandra based on the task in hand. I process the messages as soon as they come. How ever few messages are not processed completely due to the response form external sources such as an HTTP. I would like to implement a exponential backoff mechanism for retrial in-case HTTP server does not respond/returns an error message to retry after some time. I could think of few ideas using which I could achieve them. I