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Java executors: how to be notified, without blocking, when a task completes?
Say I have a queue full of tasks which I need to submit to an executor service. I want them processed one at a time. The simplest way I can think of is to:
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Dashed line border around UIView
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You can set the border with this pattern using Layer and Bezier path like below examples.
Objective-C
CAShapeLayer *yourViewBorder = [CAShapeLayer layer];
yourViewBorder.strokeColor = [UIColor blackColor].CGColor;
yourViewBorder.fi...
Rails hidden field undefined method 'merge' error
...using the non-_tag version, it is assumed that your controller has already set the value for that attribute on the object that backs the form. For example:
controller:
def new
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@order.service = "test"
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end</pre>
view:
<%= form_for @order do |f| %>
<%= f.hidden_field...
PostgreSQL disable more output
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To disable pagination but retain the output, use:
\pset pager off
To remember this setting, add it to your ~/.psqlrc.
See the psql manual.
On older versions of Pg it was just a toggle, so \pset pager
To completely suppress query output, use \o /dev/null in your psql scri...
SSH Key - Still asking for password and passphrase
...or your username / password.
If you're correctly using SSH when cloning / setting remotes. Then make sure you have a ssh-agent to remember your password. That way, you'll only enter your passphrase once by terminal session.
If it is still too annoying, then simply set a ssh-key without passphrase....
How do I add comments to package.json for npm install?
I've got a simple package.json file and I want to add a comment. Is there a way to do this, or are there any hacks to make this work?
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What's the idiomatic syntax for prepending to a short python list?
...ue definitively not entirely Liskov substitutable for list.
>>> set(dir(list)) - set(dir(deque))
{'sort'}
The deque also has an appendleft method (as well as popleft). The deque is a double-ended queue and a doubly-linked list - no matter the length, it always takes the same amount of t...
Haskell: How is pronounced? [closed]
...ady-made terms lying around that capture the way it's used in Haskell. So, set the math aside for now.
If we want to know what to call (<*>) it might help to know what it basically means.
So what's up with Applicative, anyway, and why do we call it that?
What Applicative amounts to in pra...
How can I clear an HTML file input with JavaScript?
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There's 3 ways to clear file input with javascript:
set value property to empty or null.
Works for IE11+ and other modern browsers.
Create an new file input element and replace the old one.
The disadvantage is you will lose event listeners and expando properties.
Reset the ...
Python Script execute commands in Terminal
I read this somewhere a while ago but cant seem to find it. I am trying to find a command that will execute commands in the terminal and then output the result.
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