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When should I use RequestFactory vs GWT-RPC?
...by the client code in a Proxy interface, and the RequestFactory server components take care of marshaling the data and invoking your service methods. For applications that have a well-defined concept of "Entities" or "Objects with identity and version", the EntityProxy type is used to expose the pe...
Using ChildActionOnly in MVC
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How to best catch the InvalidOperationException when a Method marked <ChildActionOnly> is called via the browser?
– Bernhard Döbler
Feb 11 '14 at 22:32
...
Quickly create a large file on a Linux system
...tual environments. Unfortunately, the answer is not as straight-forward as one might assume.
dd is the obvious first choice, but dd is essentially a copy and that forces you to write every block of data (thus, initializing the file contents)... And that initialization is what takes up so much I/O t...
What are the differences between a pointer variable and a reference variable in C++?
...nters offering extra levels of indirection. Whereas references only offer one level of indirection.
int x = 0;
int y = 0;
int *p = &x;
int *q = &y;
int **pp = &p;
pp = &q;//*pp = q
**pp = 4;
assert(y == 4);
assert(x == 0);
A pointer can be assigned nullptr directly, whereas refer...
When should I use C++14 automatic return type deduction?
...s a published interface you can (hopefully) rely on.
[*] Occasionally someone tries to make some objective measurements. To the small extent that anyone ever comes up with any statistically significant and generally-applicable results, they are completely ignored by working programmers, in favour o...
What is an EJB, and what does it do?
...
Why really use them? (Why not just stick to POJO?)
IF you need a component that accesses the database, or accesses other connectivity/ directory resources, or is accessed from multiple clients, or is intended as a SOA service, EJBs today are usually "bigger, stronger, faster (or at least more ...
Designing function f(f(n)) == -n
...sitive integer will overflow, so it will work for all integers except that one.
To make it work for real numbers you need to replace the n in (-1)n with { ceiling(n) if n>0; floor(n) if n<0 }.
In C# (works for any double, except in overflow situations):
static double F(double n)
{
if ...
How to make an Android device vibrate?
...(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
v.vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE));
} else {
//deprecated in API 26
v.vibrate(500);
}
Note:
Don't forget to include permission in AndroidManifest.xml file:
<uses-permission andro...
Which Java Collection should I use?
...
Since I couldn't find a similar flowchart I decided to make one myself.
This flow chart does not try and cover things like synchronized access, thread safety etc or the legacy collections, but it does cover the 3 standard Sets, 3 standard Maps and 2 standard Lists.
This image was ...
How do BitTorrent magnet links work?
...ed by the format ( btih in this case) with a SHA1 hash. I saw base32 mentioned, knowing it's 5 bits per character and 32 characters, I found it holds exactly 160bits, which is exactly the size of the SHA1.
...