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Why does one use dependency injection?
...So, e.g. an interface may be something such as IDisposable, IEnumerable or IPrintable. A class is an actual implementation of one or more of these interfaces: List or Map may both be implementations of IEnumerable.
To get the point: Often your classes depend on each other. E.g. you could have a Dat...
How efficient is locking an unlocked mutex? What is the cost of a mutex?
...ens often, then multiple locks would increase parallelism. At the cost of maintainability, since more locking means more debugging of the locking.
How efficient is it to lock a mutex? I.e. how much assembler instructions are there likely and how much time do they take (in the case that the mutex...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
... 各版本对比 App上架指南 入门必读 IoT专题 AI2拓展 Aia Store 关于 关于我们 发布日志 服务条款 搜索 ...
What are the differences between local branch, local tracking branch, remote branch and remote track
...m:Flimm/example.git
HEAD branch: master
Remote branches:
io-socket-ip new (next fetch will store in remotes/origin)
master tracked
new-branch tracked
Local ref configured for 'git pull':
master merges with remote master
new-branc...
How to avoid reverse engineering of an APK file?
... is looking for a needle in a haystack. Insert random classes containing snippets from the internet, or just functions for calculating random things like the Fibonacci sequence. Make sure these classes compile, but aren't used by the actual functionality of the app. Add enough of these false classes...
Fast Bitmap Blur For Android SDK
...ded 500ms while the blurring only took another 250 ms or so.
Use Renderscript
Renderscript provides ScriptIntrinsicBlur which is a Gaussian blur filter. It has good visual quality and is just the fastest you realistically get on Android. Google claims to be "typically 2-3x faster than a multithrea...
What's the “big idea” behind compojure routes?
... the HTTP response.
;; Let's take a look at an example:
(defn what-is-my-ip [request]
{:status 200
:headers {"Content-Type" "text/plain"}
:body (:remote-addr request)})
Pretty simple, but also quite low-level.
The above handler can be defined more concisely using the ring/util library.
...
How to install mongoDB on windows?
..., it’s not an installation it’s just Downloading…
I. Download the zip file http://www.mongodb.org/downloads
II. Extract it and copy the files into your desired location.
III. Start the DB engine.
IV. Test the installation and use it.
That's it! So simple, right? Ok let’s start
1. Downlo...
Algorithm to compare two images
...the copy may do stuff like rotating, making negative, or adding trivial details (as well as changing the dimension of the image).
...
Hidden Features of MySQL
... access. For example:
--datadir will specify the data directory and
--skip-innodb will turn off the inno option and save you 10-20M
More here
http://dev.mysql.com/tech-resources/articles/mysql-c-api.html
Download Chapter 7 - Free
InnoDB is transactional but there is a performance overhead that...