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Mediator Vs Observer Object-Oriented Design Patterns
...t of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and it lets you vary their interaction independently.
Source: dofactory
Example:
The observer pattern:
Class A, can have zero or more observers of type O registered with it. When s...
How to set environment variable for everyone under my linux system?
... zsh will source .sh files in /etc/profile.d/, you can see it from /etc/zshrc @Matthieu Napoli
– Bily
Jul 24 '14 at 8:45
4
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Remove a character from the end of a variable
...etion appends a / at the end of a directory name. How I can strip this off from a positional parameter?
4 Answers
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How to spread django unit tests over multiple files?
...e is no longer a need to create a package. Just name your files test*.py.
From Django 1.7 documentation
When you run your tests, the default behavior of the test utility is
to find all the test cases (that is, subclasses of unittest.TestCase)
in any file whose name begins with test, automat...
Why are elementwise additions much faster in separate loops than in a combined loop?
...ch large allocations are requested, the allocator will request fresh pages from the OS. Therefore, there is a high chance that large allocations will appear at the same offset from a page-boundary.
Here's the test code:
int main(){
const int n = 100000;
#ifdef ALLOCATE_SEPERATE
double *a1 =...
How to make a website secured with https
...ning to host it in public domain, so that the employees can connect to app from various locations. (Till now I have built web apps that are hosted internally only)
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What's the difference between an inverted index and a plain old index?
...indexes - it's just a question of which direction you're going. Forward is from documents->to->words, inverted is from words->to->documents.
Example 2: DNS
Another example is a DNS lookup (which takes a host name, and returns an IP address) and a reverse lookup (which takes an IP add...
How to deal with INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES without uninstall?
...tor). For example, if this is a device, you might have put the old copy on from a different development machine (e.g., some other developer's machine). Or, the old one is signed with your production key and the new one is signed with your debug key.
...
How can I parse a CSV string with JavaScript, which contains comma in data?
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As austincheney correctly points out, you really need to parse the string from start to finish if you wish to properly handle quoted strings that may contain escaped characters. Also, the OP does not clearly define what a "CSV string" really is. First we must define what constitutes a valid CSV str...
How do servlets work? Instantiation, sessions, shared variables and multithreading
...voke based off of request.getMethod(). If the determined method is absent from the servlet, then an HTTP 405 error is returned in the response.
The request object provides access to all of the information about the HTTP request, such as its URL, headers, query string and body. The response object...