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What does JVM flag CMSClassUnloadingEnabled actually do?
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Update This answer is relevant for Java 5-7, Java 8 has this fixed: https://blogs.oracle.com/poonam/about-g1-garbage-collector,-permanent-generation-and-metaspace Kudos go to mt.uulu
For Java 5-7:
The standard Oracle/Sun VM look on the world is: Classes are forever. So once loaded, they sta...
What is the most efficient string concatenation method in python?
...com'
lang = 'en'
path = 'some/really/long/path/'
The contenders are
f'http://{domain}/{lang}/{path}' - 0.151 µs
'http://%s/%s/%s' % (domain, lang, path) - 0.321 µs
'http://' + domain + '/' + lang + '/' + path - 0.356 µs
''.join(('http://', domain, '/', lang, '/', path)) - 0.249 µs (notice ...
Deserializing JSON data to C# using JSON.NET
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Answer reproduced from https://stackoverflow.com/a/10718128/776476
You can use the C# dynamic type to make things easier. This technique also makes re-factoring simpler as it does not rely on magic-strings.
Json
The json string below is a simpl...
callback to handle completion of pipe
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Based nodejs document, http://nodejs.org/api/stream.html#stream_event_finish,
it should handle writableStream's finish event.
var writable = getWriteable();
var readable = getReadable();
readable.pipe(writable);
writable.on('finish', function(){ ....
MySQL remove all whitespaces from the entire column
...racters :
UPDATE `table` SET `col_name` = REPLACE(`col_name`, '\n', '')
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace
To remove first and last space(s) of column :
UPDATE `table` SET `col_name` = TRIM(`col_name`)
http://dev.mysql.com/doc/refman/5.0/en/string-fu...
What is an 'endpoint' in Flask?
...ses the above view. The user enters the following URL into their browser:
http://www.example.org/greeting/Mark
The job of Flask is to take this URL, figure out what the user wants to do, and pass it on to one of your many python functions for handling. It takes the path:
/greeting/Mark
...and ...
Spring mvc @PathVariable
...xample, if the URL to retrieve a book using a unique number would be:
URL:http://localhost:8080/book/9783827319333
The number denoted at the last of the URL can be fetched using @PathVariable as shown:
@RequestMapping(value="/book/{ISBN}", method= RequestMethod.GET)
public String showBookDetail...
How to use z-index in svg elements?
...e latest object to be drawn. So swap the two elements.
<svg xmlns="http://www.w3.org/2000/svg" viewBox="30 70 160 120">
<!-- First draw the orange circle -->
<circle fill="orange" cx="100" cy="95" r="20"/>
<!-- Then draw the green circle over the current can...
Can an interface extend multiple interfaces in Java?
...hen single implementation works for both :).
Read my complete post here:
http://codeinventions.blogspot.com/2014/07/can-interface-extend-multiple.html
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Is there a print_r or var_dump equivalent in Ruby / Ruby on Rails?
...from (irb):17
>>
I also really encourage you to try ruby-debug:
http://railscasts.com/episodes/54-debugging-with-ruby-debug
http://www.sitepoint.com/article/debug-rails-app-ruby-debug/
http://www.datanoise.com/articles/2006/7/12/tutorial-on-ruby-debug
It's incredibly helpful!
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