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Java Annotations
...ass in your code, you can access the attributes and act according to the information found there. I don't know any examples in Java but in .NET this is used by the compiler to generate (de)serialization information for classes, determine the memory layout of structures and declare function imports f...
How do I expire a PHP session after 30 minutes?
...ion with ini_set('session.gc-maxlifetime', 1800)? Otherwise your session information could get destroyed while your session is still supposed to be valid, at least if the ini setting is the standard 24 minutes. Or am I missing something?
– jeroen
Oct 27 '10 at ...
Possible to do a MySQL foreign key to one of two possible tables?
...terms of relational theory, Polymorphic Associations violates First Normal Form, because the popular_place_id is in effect a column with two meanings: it's either a state or a country. You wouldn't store a person's age and their phone_number in a single column, and for the same reason you shouldn't...
Type.GetType(“namespace.a.b.ClassName”) returns null
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The form used in this answer is also a fully qualified type name according to the MSDN grammar (so it is not a trick). The form is NamespaceTypeName, AssemblyNameSpec where AssemblyNameSpec is the identifier of the assembly witho...
background function in Python
...n do this within the scope of the threading module Python provides.
To perform said actions, I would use event objects and the Queue module.
However, a quick and dirty demonstration of what you can do using a simple threading.Thread implementation can be seen below:
import os
import threading
imp...
Best way to add comments in erb
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I used to use this format until I noticed it just raised an error on someones computer in my team (we were both using linux, but different distros), regardless I avoid it since..
– vise
May 5 '10 at 21:57
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How can I sanitize user input with PHP?
...nly case where you need to actively filter data, is if you're accepting preformatted input. For example, if you let your users post HTML markup, that you plan to display on the site. However, you should be wise to avoid this at all cost, since no matter how well you filter it, it will always be a po...
Simple basic explanation of a Distributed Hash Table (DHT)
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This gives a lot of fault-tolerance and reliability, and possibly some performance benefit, but it also throws up a lot of headaches. For example, what happens when a node leaves the network, by failing or otherwise? And how do you redistribute keys when a node joins so that the load is roughly bal...
Why escape_javascript before rendering a partial?
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Yeah, actually it's more of a formatting method. It doesn't prevent users from executing their own javascript. Nothing can prevent that.
– LasagnaAndroid
Feb 23 '15 at 1:31
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What is a difference between
...(In both cases E itself is okay.)
So the constructor uses the ? extends E form so it guarantees that when it fetches values from the collection, they will all be E or some subclass (i.e. it's compatible). The drainTo method is trying to put values into the collection, so the collection has to have ...