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When to use Task.Delay, when to use Thread.Sleep?
... Thread.Sleep will block the current thread which causes a context switch. If you're using a thread pool this could also cause a new thread to be allocated. Both operations are quite heavy whereas the cooperative multi-tasking provided by Task.Delay etc is designed to avoid all of that overhead, max...
ASP.NET MVC Ajax Error handling
...
If the server sends some status code different than 200, the error callback is executed:
$.ajax({
url: '/foo',
success: function(result) {
alert('yeap');
},
error: function(XMLHttpRequest, textStatus,...
Default value of 'boolean' and 'Boolean' in Java
...ery wrapper uses a reference which has a default of null. Primitives have different default values:
boolean -> false
byte, char, short, int, long -> 0
float, double -> 0.0
Note (2): void has a wrapper Void which also has a default of null and is it's only possible value (without using ...
How do you connect to multiple MySQL databases on a single webpage?
...elow from @Troelskn
You can make multiple calls to mysql_connect(), but if the parameters are the same you need to pass true for the '$new_link' (fourth) parameter, otherwise the same connection is reused. For example:
$dbh1 = mysql_connect($hostname, $username, $password);
$dbh2 = mysql_connec...
Perforce for Git users? [closed]
...tools that ostensibly do the same thing, their approach could not be more different. This brief write-up will try to help new Perforce users coming from Git understand the new world they are in.
One brief detour before we dive in; if you prefer Git you can use Git with Perforce quite well. We provi...
Differences between action and actionListener
What is the difference between action and actionListener , and when should I use action versus actionListener ?
4 Ans...
Makefile variable as prerequisite
...
This will cause a fatal error if ENV is undefined and something needs it (in GNUMake, anyway).
.PHONY: deploy check-env
deploy: check-env
...
other-thing-that-needs-env: check-env
...
check-env:
ifndef ENV
$(error ENV is undefined)
endif
(Note t...
Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
I need to check a JavaScript array to see if there are any duplicate values. What's the easiest way to do this? I just need to find what the duplicated values are - I don't actually need their indexes or how many times they are duplicated.
...
Java: Multiple class declarations in one file
...her this actually changes between implementations - I highly doubt it, but if you avoid doing it in the first place, you'll never need to care :)
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How to make a Java class that implements one interface with two generic types?
...<Apple> {
public void consume(Apple a) { ..... }
}
}
If creating these static inner classes bothers you, you can use anonymous classes:
public class TwoTypesConsumer {
private Consumer<Tomato> tomatoConsumer = new Consumer<Tomato>() {
public void consum...