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LinkedBlockingQueue vs ConcurrentLinkedQueue
... the fundamental interface for producer/consumer queues IMO. You'd have to call poll(), wait a bit if you hadn't found anything, and then poll again etc... leading to delays when a new item comes in, and inefficiencies when it's empty (due to waking up unnecessarily from sleeps).
From the docs for ...
#if DEBUG vs. Conditional(“DEBUG”)
...L on release.
[Conditional("DEBUG")]: This code will reach the IL, however calls to the method will be omitted unless DEBUG is set when the caller is compiled.
Personally I use both depending on the situation:
Conditional("DEBUG") Example: I use this so that I don't have to go back and edit my co...
Oracle Differences between NVL and Coalesce
...:
SELECT SUM(val)
FROM (
SELECT NVL(1, LENGTH(RAWTOHEX(SYS_GUID()))) AS val
FROM dual
CONNECT BY
level <= 10000
)
This runs for almost 0.5 seconds, since it generates SYS_GUID()'s, despite 1 being not a NULL.
SELECT SUM(val)
FROM (
...
How do I list all the columns in a table?
...nstruction but a SQL*Plus command, and as such it doesn't work in most SQL IDEs.
– walen
Dec 13 '18 at 14:29
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What is a StackOverflowError?
...a variable in the stack references that object on the heap). The stack typically lives at the upper end of your address space and as it is used up it heads towards the bottom of the address space (i.e. towards zero).
Your process also has a heap, which lives at the bottom end of your process. As yo...
Argparse: Required arguments listed under “optional arguments”?
...lp are generated by two argument groups in which the arguments are automatically separated into. Now, you could “hack into it” and change the name of the optional ones, but a far more elegant solution would be to create another group for “required named arguments” (or whatever you want to ca...
How to permanently add a private key with ssh-add on Ubuntu? [closed]
... files to be kept permanently, by adding them in your ~/.ssh/config file:
IdentityFile ~/.ssh/gitHubKey
IdentityFile ~/.ssh/id_rsa_buhlServer
If you do not have a 'config' file in the ~/.ssh directory, then you should create one. It does not need root rights, so simply:
nano ~/.ssh/config
...a...
What's the difference between Thread start() and Runnable run()
...ment the Runnable interface and thus implement the run() method. When you call r1.run() you are executing it in the current thread.
Second example: Two separate threads.
Thread t1 = new Thread(r1);
Thread t2 = new Thread(r2);
t1 and t2 are objects of the class Thread. When you call t1.start(),...
set the width of select2 input (through Angular-ui directive)
...
You need to specify the attribute width to resolve in order to preserve element width
$(document).ready(function() {
$("#myselect").select2({ width: 'resolve' });
});
...
difference between css height : 100% vs height : auto
...means the element height will depend upon the height of its children.
Consider these examples:
height: 100%
<div style="height: 50px">
<div id="innerDiv" style="height: 100%">
</div>
</div>
#innerDiv is going to have height: 50px
height: auto
<div style="hei...