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Repository Pattern vs DAL
..."Repository," but a DAL. A contrived example in pseudo-code:
specification100 = new AccountHasMoreOrdersThan(100)
specification200 = new AccountHasMoreOrdersThan(200)
assert that specification200.isSpecialCaseOf(specification100)
specificationAge = new AccountIsOlderThan('2000-01-01')
combinedSp...
Set the table column width constant regardless of the amount of text in its cells?
In my table I set the width of the first cell in a column to be 100px .
However, when the text in one of the cell in this column is too long, the width of the column becomes more than 100px . How could I disable this expansion?
...
Why is iterating through a large Django QuerySet consuming massive amounts of memory?
... djangoapp.models import model
paginator = Paginator(model.objects.all(), 1000) # chunks of 1000, you can
# change this to desired chunk size
for page in range(1, paginator.num_pages + 1):
for row in paginator.page(page).object_list:
# ...
write a shell script to ssh to a remote machine and execute commands
...e; hostname -f'
If the file hosts.txt has a large number of entries, say 100, then the parallelism option may also be set to 100 to ensure that the commands are run concurrently:
pssh -i -h hosts.txt -p 100 -t 0 sleep 10000
Options:
-I: Read input and sends to each ssh process.
-P: Tells p...
Vertically centering a div inside another div [duplicate]
...nner {
position: absolute;
top: 50%;
left: 50%;
width: 100px;
height: 100px;
-webkit-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
background: red;
}
<div class="cn">
<div class="inner">
test
<...
Is Big O(logn) log base e?
... @Kinopiko: OK. I think we are saying the same thing. I would say O(100) = O(1) because O(100) = O(100 * 1) = O(C * 1) = O(1). Which is what I meant by constant expressions being superfluous. That is, the order of any constant is 1.
– Daniel Pryden
Oct...
Custom thread pool in Java 8 parallel stream
...parallelism", "20");
s.parallel().forEach(i -> {
try { Thread.sleep(100); } catch (Exception ignore) {}
System.out.print((System.currentTimeMillis() - start) + " ");
});
The output is:
215 216 216 216 216 216 216 216 315 316 316 316 316 316 316 316 415 416 416 416
So you can see t...
When should I use Struct vs. OpenStruct?
...
Other benchmark:
require 'benchmark'
require 'ostruct'
REP = 100000
User = Struct.new(:name, :age)
USER = "User".freeze
AGE = 21
HASH = {:name => USER, :age => AGE}.freeze
Benchmark.bm 20 do |x|
x.report 'OpenStruct slow' do
REP.times do |index|
OpenStruct.new(:na...
css z-index lost after webkit transform translate3d
...50px);
}
#element_b {
-webkit-transform: translate3d(0, 0, 100px);
}
#element_a:hover {
-webkit-transform: translate3d(100px, 0, 60px);
}
#element_b:hover {
-webkit-transform: translate3d(-100px, 0, -60px);
}
</style>
<body>
<d...
Short description of the scoping rules?
...scope:
from __future__ import print_function # for python 2 support
x = 100
print("1. Global x:", x)
class Test(object):
y = x
print("2. Enclosed y:", y)
x = x + 1
print("3. Enclosed x:", x)
def method(self):
print("4. Enclosed self.x", self.x)
print("5. Globa...