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How does facebook, gmail send the real time notification?
...t's a fair point, however this answer was written in 2009, before facebook started using hiphop. At the time facebook was still a very large-scaled system using php on it's own.
– Alistair Evans
Oct 16 '11 at 9:35
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How can I use Spring Security without sessions?
...ks for my use case. I don't actually require that Spring Security doesn't start a session (because I use session in other parts of the application), just that it doesn't "remember" authentication in the session at all (it should be re-checked every request).
To begin with, I wasn't able to figure ...
Synchronization vs Lock
...e writing code whereas with a synchronized you are basically fine from the start. On this basis alone I would say synchronized is easier (given you want its behavior) than java.util.concurrent.locks.Lock. par 4
– Iwan Aucamp
Jun 4 '14 at 14:50
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How to select different app.config for several build configurations
... file: be it a console, desktop, web, mobile app or something else. If you start providing configuration for a dll, you may end up with something I can call a config hell. You may no longer understand (easily) why this and that variables have such weird values coming seemingly from nowhere.
"Hold o...
When do you use map vs flatMap in RxJava?
... useful one idea is to "flatten" this observable of observables (you might start to see where the name _flat_Map comes from). RxJava provides a few ways to flatten observables and for sake of simplicity lets assume merge is what we want. Merge basically takes a bunch of observables and emits wheneve...
Why we should not use protected static in java
... be static, then I make it static. - This will get you in trouble when you start using mock frameworks for unit testing. But this leads us to a different topic ...
– barfuin
Jun 18 '14 at 16:20
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How do I pull my project from github?
...wiped out your computer and want to checkout your project again, you could start by doing the below initial settings:
git config --global user.name "Your Name"
git config --global user.email youremail@domain.com
Login to your github account, go to the repository you want to clone, and copy the UR...
Separation of JUnit classes into special test package?
...o try searching among a couple of hundred test classes, each of whose name starts with Test...
Update inspired by @Ricket's comment: this way test classes (typically) show up right after their tested buddy in a project-wise alphabetic listing of class names. (Funny that I am benefiting from this da...
ScalaTest in sbt: is there a way to run a single test without tags?
...ec -- -z "works with multiple arguments"
This will run the two tests that start with "works with":
testOnly *CardiBSpec -- -z "works with"
I can't get the -t option to run any tests in the CardiBSpec file. This command doesn't run any tests:
testOnly *CardiBSpec -- -t "works with multiple argumen...
Definition of a Balanced Tree
...h of the longest path from that node downward to a leaf, counting both the start and end vertices of the path.
A node in a tree is height-balanced if the heights of its subtrees differ by no more than 1.
A tree is height-balanced if all of its nodes are height-balanced.
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