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How do servlets work? Instantiation, sessions, shared variables and multithreading
...afety
That said, your major concern is possibly thread safety. You should now know that servlets and filters are shared among all requests. That's the nice thing about Java, it's multithreaded and different threads (read: HTTP requests) can make use of the same instance. It would otherwise be too e...
How to generate random SHA1 hash to use as ID in node.js?
... unique value in all but the most insane parallel computing situations. I know its silly and randomBytes(20) is going to be unique, but its just a confidence we can have because we may not be familiar with internals of random generation of another library.
– Dmitri R117
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Where to find the win32api module for Python? [closed]
...p install pypiwin32!
Edit: Per comment from @movermeyer, the main project now publishes wheels at pywin32, and so can be installed with pip install pywin32
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Recommendation for compressing JPG files with ImageMagick
...nce in size. By default the output size is bigger than the input. I don't know why, but after adding some +profile options and setting down the quality I can get an smaller size but still similar to original.
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What is the difference between active and passive FTP?
...rties.
In passive mode, the client establishes both channels. We already know it establishes the command channel in active mode and it does the same here.
However, it then requests the server (on the command channel) to start listening on a port (at the servers discretion) rather than trying to es...
What's “wrong” with C++ wchar_t and wstrings? What are some alternatives to wide characters?
...ames), though Windows is the only platform where this is true as far as I know (so maybe we can think of wchar_t as 'Windows_char_t').
In hindsight wchar_t is clearly not useful for simplifying text handling, or as storage for locale independent text. Portable code should not attempt to use it for ...
Skip List vs. Binary Search Tree
I recently came across the data structure known as a skip list . It seems to have very similar behavior to a binary search tree.
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How to handle Handler messages when activity/fragment is paused
... /**
* Store the message if we have been paused, otherwise handle it now.
*
* @param msg Message to handle.
*/
@Override
public final synchronized void handleMessage(Message msg) {
if (activity == null) {
final Message msgCopy = new Message();
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Scala: What is a TypeTag and how do I use it?
All I know about TypeTags is that they somehow replaced Manifests. Information on the Internet is scarce and doesn't provide me with a good sense of the subject.
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PHP_SELF vs PATH_INFO vs SCRIPT_NAME vs REQUEST_URI
...xample.com/index.php/faq/whatever . I need a reliable way for a script to know what it's address is, so it will know what to do with the navigation. I've used mod_rewrite , as per CodeIgniter documentation.
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