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Redis cache vs using memory directly
...er, it also brings some interesting properties:
Redis can be accessed by all the processes of your applications, possibly running on several nodes (something local memory cannot achieve).
Redis memory storage is quite efficient, and done in a separate process. If the application runs on a platform...
mvn clean install vs. deploy vs. release
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The clean, install and deploy phases are valid lifecycle phases and invoking them will trigger all the phases preceding them, and the goals bound to these phases.
mvn clean install
This command invokes the clean phase and then the in...
Is it possible to specify a starting number for an ordered list?
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start="number" sucks because it doesn't automatically change based on the numbering before it.
Another way to do this that may fit more complicated needs is to use counter-reset and counter-increment.
Problem
Say you wanted something like this:
1. Item one
2. Item two
...
What is the default value for enum variable?
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It is whatever member of the enumeration represents the value 0. Specifically, from the documentation:
The default value of an enum E is the value produced by the expression (E)0.
As an example, take the following enum:
enum E
{
Foo, Bar, Baz, Quux
}
Without overriding the default val...
Adding and removing style attribute from div with jquery
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You could do any of the following
Set each style property individually:
$("#voltaic_holder").css("position", "relative");
Set multiple style properties at once:
$("#voltaic_holder").css({"position":"relative", "top":"-75px"});
Remove a specific style:
$("#voltaic_holder").css({"top":...
Rounding DateTime objects
...clear in your initial spec.
How you want boundary cases to round.
normally only an issue if you are rounding to the middle rather than the end.
Since rounding to the middle is an attempt at a bias free answer you need to use something like Bankers Rounding technically round half even to be trul...
Rails: Missing host to link to! Please provide :host parameter or set default_url_options[:host]
...default_url_options = { :host => "yourhost" }
That way, it can work in all environments and could be different from environment to environment. For example:
development.rb
config.action_mailer.default_url_options = { :host => "dev.yourhost.com" }
test.rb
config.action_mailer.default_url_...
Git production/staging server workflow
...y good concepts of branching and versioning.
– Edgar Alloro
Nov 21 '18 at 21:52
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How to create a windows service from java app
I've just inherited a java application that needs to be installed as a service on XP and vista. It's been about 8 years since I've used windows in any form and I've never had to create a service, let alone from something like a java app (I've got a jar for the app and a single dependency jar - log4j...
Getting pids from ps -ef |grep keyword
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pgrep -f keyword
From the man page:
-f The pattern is normally only matched against the process name. When -f is set, the full command line is used.
If you really want to avoid pgrep, try:
ps -ef | awk '/[k]eyword/{print $2}'
Note the [] around the first letter of the keywor...