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How to run a background task in a servlet based web application?
...er/java.lang.Thread in a Java EE / Servlet based environment
Last but not least, never directly use java.util.Timer and/or java.lang.Thread in Java EE. This is recipe for trouble. An elaborate explanation can be found in this JSF-related answer on the same question: Spawning threads in a JSF manage...
Hashset vs Treeset
...ynchronized. That is if multiple threads access a set concurrently, and at least one of the threads modifies the set, it must be synchronized externally.
LinkedHashSet is in some sense intermediate between HashSet and TreeSet. Implemented as a hash table with a linked list running through it, howeve...
Default value of function parameter
... optional parameters after one optional parameter. It's a syntax error (at least with g++ 4.5.3 on my system).
– Nilesh
Sep 9 '11 at 13:38
...
Difference between core and processor
...es, although it says model: AMD Ryzen 7 2700X Eight-Core Processor. So, at least in this case, each of the 8 "cores" has two "processors", which is at odds with some other answers here.
– jwd
Aug 22 '19 at 20:16
...
How to swap keys and values in a hash
...stify this concern. It's just a doubt I can't seem to ignore. Principle of least surprise?
– Nigel Thorne
May 10 '19 at 2:30
...
Convert blob URL to normal URL
...an ordinary file.
It is possible convert a blob: URL into a data: URL, at least in Chrome. You can use an AJAX request to "fetch" the data from the blob: URL (even though it's really just pulling it out of your browser's memory, not making an HTTP request).
Here's an example:
var blob = new B...
When serving JavaScript files, is it better to use the application/javascript or application/x-javas
...thing different, they should go on that rather then what the HTML says (at least according to HTTP, you might be looking at a different spec, you didn't provide any links).
– Quentin
Feb 10 '13 at 1:46
...
What are the most interesting equivalences arising from the Curry-Howard Isomorphism?
...ly, (a ∧ b) → (a ∨ b), since if both a and b are true, then at least one is true. Thus, if discriminated unions are some form of disjunction, they must be the inclusive variety. I think this holds as a proof, but feel more than free to disabuse me of this notion.
Similarly, your defini...
PHP global in functions
...') < 0) {
print 'Your PHP installation is too old. Drupal requires at least PHP 5.2.4. See the <a href="http://drupal.org/requirements">system requirements</a> page for more information.';
exit;
}
// Start the installer.
require_once DRUPAL_ROOT . '/includes/install.c...
Simple way to encode a string according to a password?
...es to UTF8, easily reverted again using bytesvalue.decode().
Last but not least, when encrypting and decrypting, we talk about keys, not passwords. A key should not be human memorable, it is something you store in a secret location but machine readable, whereas a password often can be human-readabl...