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How do servlets work? Instantiation, sessions, shared variables and multithreading
... in web.xml. The timeout value defaults to 30 minutes. So, when the client doesn't visit the web app for longer than the time specified, the servlet container trashes the session. Every subsequent request, even with the cookie specified, will not have access to the same session anymore; the servlet ...
How to declare global variables in Android?
...t qualified to answer how that would interact with my solution. If someone does have an answer to this, I am willing to credit them and put the information in this post for maximum visibility.
ADDENDUM:
As some people have noted, this is not a solution for persistent state, something I perhaps sho...
public friend swap member function
...r, some libraries like Boost provided the function boost::swap, which just does an unqualified call to swap, with std::swap as an associated namespace. This helps make things succinct again, but it's still a bummer.
Note that there is no change in C++11 to the behavior of std::swap, which I and oth...
What do
...es that you have an implicit conversion From => To, but the implication doesn't run backwards; having an implicit conversion A => B does not imply you have an instance of A =:= B. =:= is a sealed abstract class defined in scala.Predef, and has only one publicly exposed instance, which is impli...
How to elegantly deal with timezones
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It seems to be workable if some one does not have n-tier architecture or Web libraries are shared. How we can share timezone id to data layer.
– Vikash Kumar
Jul 10 '15 at 9:38
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Why are margin/padding percentages in CSS always calculated against width?
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Why does W3C constantly do this? Apparently 'semantic' to the W3C is the equivalent of having to cater to people that can't think logically, which makes no sense. It's like complaining about how confusing and dumb people are in ...
Scala type programming resources
...t = ttv.getValue()
To understand how toInt works, let's consider what it does on a couple of inputs:
val z:_0 = null
val y:Succ[_0] = null
When we call toInt(z), the compiler looks for an implicit argument ttv of type TypeToValue[_0, Int] (since z is of type _0). It finds the object _0ToInt, it...
Multiprocessing - Pipe vs Queue
...s; JoinableQueue() accounts for tasks when queue.task_done() is called (it doesn't even know about the specific task, it just counts unfinished tasks in the queue), so that queue.join() knows the work is finished.
The code for each at bottom of this answer...
mpenning@mpenning-T61:~$ python multi_...
How do you do a deep copy of an object in .NET? [duplicate]
...Clone will do deep copy too, it works 3 times faster then BinaryFormatter, doesn't require default constructor or any attributes. See my answer: stackoverflow.com/a/11308879/235715
– Alex Burtsev
Jul 12 '12 at 4:19
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Different types of thread-safe Sets in Java
...array must be locked down by synchronizing. Therefore, CopyOnWriteArraySet doesn't totally avoid the necessity of synchronization.
– CaptainHastings
Jun 5 '15 at 13:07
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