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log4j logging hierarchy order
...ation is also vague on this. The output method such as error, info, debug, etc. of the logger assigns a priority/severity level to the logging message. If the logging really takes effect (the message will be visible) depends on the effective logging level of the logger being used.
...
Google Guice vs. PicoContainer for Dependency Injection
...work in your code. Because they do have a lot of other helpers / utilities etc. the temptation is pretty strong to depend on Spring code, though.
Performance
Pico - I'm not too familiar with the speed characteristics of Pico
Guice - Guice was designed to be fast and the comparison mentioned in the r...
What is the best algorithm for overriding GetHashCode?
... just wrap
{
int hash = 17;
// Suitable nullity checks etc, of course :)
hash = hash * 23 + field1.GetHashCode();
hash = hash * 23 + field2.GetHashCode();
hash = hash * 23 + field3.GetHashCode();
return hash;
}
}
As noted in comments, you may...
C# switch statement limitations - why?
...onstant time branch. The compiler may find short-cuts (using hash buckets, etc), but more complicated cases will generate more complicated MSIL code with some cases branching out earlier than others.
To handle the String case, the compiler will end up (at some point) using a.Equals(b) (and possibl...
How to get ELMAH to work with ASP.NET MVC [HandleError] attribute?
...he answer below by @IvanZlatev with regards to applicability, shortcomings etc. People are commenting that it is easier/shorter/simpler and achieves the same as your answer and as such should be marked as the correct answer. It would be good to have your perspective on this and achieve some clarity ...
Show pop-ups the most elegant way
...trol visibility.
Create scope variables that bond to OK / Cancel functions etc.
Editing to add a high level example (non functional)
<div id='popup1-content' popup='showPopup1'>
....
....
</div>
<div id='popup2-content' popup='showPopup2'>
....
....
</div>
.di...
Database cluster and load balancing
...ntended to guarantee validity even in the event of errors, power failures, etc. In the context of databases, a sequence of database operations that satisfies the ACID properties (and these can be perceived as a single logical operation on the data) is called a transaction. For example, a transfer of...
node and Error: EMFILE, too many open files
...ockets is a good example), you can permanently increase the limit:
file: /etc/pam.d/common-session (add to the end)
session required pam_limits.so
file: /etc/security/limits.conf (add to the end, or edit if already exists)
root soft nofile 40000
root hard nofile 100000
restart your node...
C# version of java's synchronized keyword?
...s allows more granular usage, and allows use of Monitor.Wait/Monitor.Pulse etc to communicate between threads.
A related blog entry (later revisited).
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Why would I want stage before committing in Git?
...ake changes to these files
git add File3 File4
# Verify changes, run tests etc..
git commit -m 'Correct typos'
git push
In a nutshell, git add and git commit lets you break down a change to the main repository into systematic logical sub-changes. As other answers and comments have pointed out, the...