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Java executors: how to be notified, without blocking, when a task completes?

... of the task. You could even write a general wrapper for Runnable tasks, and submit these to ExecutorService. Or, see below for a mechanism built into Java 8. class CallbackTask implements Runnable { private final Runnable task; private final Callback callback; CallbackTask(Runnable task...
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How to do a Jquery Callback after form submit?

...").bind('ajax:complete', function() { // tasks to do }); And things worked perfectly . See this api documentation for more specific details. share | improve this answer |...
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How to combine two or more querysets in a Django view?

I am trying to build the search for a Django site I am building, and in that search, I am searching in 3 different models. And to get pagination on the search result list, I would like to use a generic object_list view to display the results. But to do that, I have to merge 3 querysets into one. ...
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Why does C++ not allow inherited friendship?

Why is friendship not at least optionally inheritable in C++? I understand transitivity and reflexivity being forbidden for obvious reasons (I say this only to head off simple FAQ quote answers), but the lack of something along the lines of virtual friend class Foo; puzzles me. Does anyone know ...
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How to change the default GCC compiler in Ubuntu?

...n ubuntu 11.04 which already has gcc/g++-4.4. So in my system both gcc-3.3 and 4.4 are available. I am able to call both compilers as I want. If I just call the command gcc then gcc-4.4 will get called. To call gcc-3.3, I have to use the command gcc-3.3 . ...
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AngularJS - difference between pristine/dirty and touched/untouched

AngularJS Developer Guide - Forms tell there are many styles and directives regarding forms and fields. For each one, a CSS class: ...
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How to check task status in Celery?

... Return the task_id (which is given from .delay()) and ask the celery instance afterwards about the state: x = method.delay(1,2) print x.task_id When asking, get a new AsyncResult using this task_id: from celery.result import AsyncResult res = AsyncResult("your-task-id") ...
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Java associative-array

How can I create and fetch associative arrays in Java like I can in PHP? 15 Answers 15...
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How to make custom error pages work in ASP.NET MVC 4

I want a custom error page shown for 500, 404 and 403. Here's what I have done: 11 Answers ...
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“The run destination iOS Device is not valid for running the scheme”

... It was a bug in XCode, I closed and reopened Xcode and it started working. I've noticed this sort of thing many many times now with Xcode with other problems, its very frustrating that the tool is so dodgy. ...