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ActiveMQ or RabbitMQ or ZeroMQ or [closed]
...ing
written by Blaine Cook at Twitter
Starling is a Message Queue Server based on MemCached
written in Ruby
stores jobs in memory (message queue)
documentation: some good tutorials, for example the railscast about starling and workling or this blog post about starling
Kestrel
written by Robey ...
demystify Flask app.secret_key
...etc.
>>> if not good_cookie:
... security_log(cookie)
Hash-based Message Authentication Code (HMAC)
The type of signature generated above that requires a secret key to ensure the integrity of some contents is called in cryptography a Message Authentication Code or MAC.
I specified ...
Attach to a processes output for viewing
...tion is to launch your program inside of 'screen', which is a sort-of text-based Terminal application. Screen sessions can be attached and detached, but are nominally meant only to be used by the same user, so if you want to share them between users, it's a big pain in the ass.
...
Reorder levels of a factor without changing order of values
...
some more, just for the record
## reorder is a base function
df$letters <- reorder(df$letters, new.order=letters[4:1])
library(gdata)
df$letters <- reorder.factor(df$letters, letters[4:1])
You may also find useful Relevel and combine_factor.
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sql server invalid object name - but tables are listed in SSMS tables list
I am attempting to create a Stored Procedure for a newly created database. However the SSMS intellisense does not recognize more than half of the tables which have been created.
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Optimise PostgreSQL for fast testing
...disk or other non-durable storage.
If you lose a tablespace the whole database may be damaged and hard to use without significant work. There's very little advantage to this compared to just using UNLOGGED tables and having lots of RAM for cache anyway.
If you truly want a ramdisk based system, in...
Select unique or distinct values from a list in UNIX shell script
...pected data. Perl is better for huge dataset with many duplicates (no disk-based storage required). Huge dataset with few duplicates should use sort (and disk storage). Small datasets can use either. Personally, I'd try Perl first, switch to sort if it fails.
– paxdiablo
...
Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available”
...g>
Note thus that you should not use both ways. Use either annotation based configuarion or XML based configuration. When you have both, then XML based configuration will override annotation based configuration.
Verifying the build/deployment
In case you're using a build tool such as Eclipse ...
Why does ConcurrentHashMap prevent null keys and values?
...ining the source code it appears I was wrong - they lock using a "segment" based on a bitmask of the hash.
In that case, I suspect they did it to copy Hashtable, and I suspect Hashtable did it because in the relational database world, null != null, so using a null as a key has no meaning.
...
What is the default initialization of an array in Java?
...So your array contains five zeros right after it is created by new.
Note (based on comments): The Java Virtual Machine is not required to zero out the underlying memory when allocating local variables (this allows efficient stack operations if needed) so to avoid random values the Java Language Sp...