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Can PostgreSQL index array columns?
I can't find a definite answer to this question in the documentation. If a column is an array type, will all the entered values be individually indexed?
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ASP.NET_SessionId + OWIN Cookies do not send to browser
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I have encountered the same problem and traced the cause to OWIN ASP.NET hosting implementation. I would say it's a bug.
Some background
My findings are based on these assembly versions:
Microsoft.Owin, Version=2.0.2.0, Culture=neutral, PublicKey...
Is gcc std::unordered_map implementation slow? If so - why?
...nce critical software in C++. There we need a concurrent hash map and implemented one. So we wrote a benchmark to figure out, how much slower our concurrent hash map is compared with std::unordered_map .
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Calling clojure from java
... the top google hits for "calling clojure from java" are outdated and recommend using clojure.lang.RT to compile the source code. Could you help with a clear explanation of how to call Clojure from Java assuming you have already built a jar from the Clojure project and included it in the classpath...
Which parts of Real World Haskell are now obsolete or considered bad practice?
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Main issue of RWH
It's old. RWH was written at a time version 6.8 of GHC was being used. 6.8 used base version 3.0.x.x. 6.10.1 already used 4.0.0.0, which introduced many changes. And that's just the jump from 6.8 to 6.10. The current version of GHC is 7.10. Monads have been ...
MySQL: @variable vs. variable. What's the difference?
In another question I posted someone told me that there is a difference between:
4 Answers
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What does Docker add to lxc-tools (the userspace LXC tools)?
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From the Docker FAQ:
Docker is not a replacement for lxc. "lxc" refers to capabilities of the linux kernel (specifically namespaces and control groups) which allow sandboxing processes from one another, and controlling their resource allocations.
On top of this low-le...
Enable access control on simple HTTP server
...w-Origin', '*')
SimpleHTTPRequestHandler.end_headers(self)
if __name__ == '__main__':
test(CORSRequestHandler, HTTPServer, port=int(sys.argv[1]) if len(sys.argv) > 1 else 8000)
Python 2 solution
Python 2 uses SimpleHTTPServer.SimpleHTTPRequestHandler and the BaseHTTPServer module ...
How to test my servlet using JUnit
...ect params, verify they were indeed called (optionally specify number of times), write the 'result' and verify it's correct.
import static org.junit.Assert.*;
import static org.mockito.Mockito.*;
import java.io.*;
import javax.servlet.http.*;
import org.apache.commons.io.FileUtils;
import org.junit...
What is the difference between atomic / volatile / synchronized?
...NextUniqueIndex() {
return counter++;
}
It basically reads value from memory, increments it and puts back to memory. This works in single thread but nowadays, in the era of multi-core, multi-CPU, multi-level caches it won't work correctly. First of all it introduces race condition (several thre...