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Avoid synchronized(this) in Java?
...a public hosting service based on your container implementation.
I'm your customer and deploy my "good" servlet on your site. It happens that my code contains a call to getAttribute.
A hacker, disguised as another customer, deploys his malicious servlet on your site. It contains the following code...
When should I use the new keyword in C++?
...if you're more advanced, best practice would usually be to encapsulate the custom way you're using new and delete into a small class (such as a custom smart pointer) that is dedicated just to object lifecycle issues.
Of course, behind the scenes, these smart pointers are still performing dynamic al...
Why use argparse rather than optparse?
...ing more informative usage messages
providing a much simpler interface for custom types and actions
More information is also in PEP 389, which is the vehicle by which argparse made it into the standard library.
share
...
Design by contract using assertions or exceptions? [closed]
...ailFast.pdf), Jim Shore points out, "Remember, an error that occurs at the customer’s site made it through your testing process. You’ll probably have trouble reproducing it. These errors are the hardest to find, and a well-placed assertion explaining the problem could save you days of effort."
...
How are parameters sent in an HTTP POST request?
...ould be anything, ranging from text/plain, over application/json or even a custom application/octet-stream.
In any case, if a POST request is made with a Content-Type which cannot be handled by the application, it should return a 415 status-code.
Most programming languages (and/or web-frameworks) ...
Is there an easy way to add a border to the top and bottom of an Android View?
...esn't have any transparent areas. If it does I would recommend you write a custom BorderView which only draws the border - it should only be a few dozen lines of code.
<View
android:id="@+id/border"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:...
Rails has_and_belongs_to_many migration
...index [:restaurant_id, :user_id]
end
Note: There is also an option for a custom table name that can be passed as a parameter to create_join_table called table_name. From the docs
By default, the name of the join table comes from the union of the
first two arguments provided to create_join_ta...
How to get a complete list of object's methods and attributes?
...
This is how I do it, useful for simple custom objects to which you keep adding attributes:
Given an object created with obj = type("Obj",(object,),{}), or by simply:
class Obj: pass
obj = Obj()
Add some attributes:
obj.name = 'gary'
obj.age = 32
then, to o...
“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
...explicitly initialize the variable.
$value = $_POST['value'] ?? '';
Set a custom error handler for E_NOTICE and redirect the messages away from the standard output (maybe to a log file):
set_error_handler('myHandlerForMinorErrors', E_NOTICE | E_STRICT)
Disable E_NOTICE from reporting. A quick w...
What does “zend_mm_heap corrupted” mean
...e in production. However, some single instances -- non-production/sandbox, customer one-offs -- do not use memcache. In the latter case, I had a configuration copied from production to a customer one-off, and the memcache configuration indicated a memcache server URI that was not available in that e...