Tutorial by Examples: e

To add a background-image rule via the CSSOM, first get a reference to the rules of the first stylesheet: var stylesheet = document.styleSheets[0].cssRules; Then, get a reference to the end of the stylesheet: var end = stylesheet.length - 1; Finally, insert a background-image rule for the bo...

This is a step by step guide to set up the automated build process using Jenkins CI for your Android projects. The following steps assume that you have new hardware with just any flavor of Linux installed. It is also taken into account that you might have a remote machine. PART I: Initial setup on ...

First of all, Ensure that the user which will be running this call has the Change backup settings and control backup process privilege. # # TC Backup Launcher # Script to launch a backup on the TeamCity Server # Param( [Parameter(Mandatory=$true)][string]$username, [Parameter(Mandato...

Describes a dependency relationship between actors, the parent and child releationship. Parent is unique because it has created the child actor, so the parent is responsible for reacting when failures happens in his child. And parent decides which choice needs to be selected. When a parent receives...

There are two type of supervision strategies that we follow to supervise any actor: One-For-One Strategy One-For-All Strategy case object ResumeException extends Exception case object StopException extends Exception case object RestartException extends Exception override v...

Supervision and Monitoring

PHP lacks a build-in function to encrypt and decrypt large files. openssl_encrypt can be used to encrypt strings, but loading a huge file into memory is a bad idea. So we have to write a userland function doing that. This example uses the symmetric AES-128-CBC algorithm to encrypt smaller chunks of...

Suppose you have two views ViewA and ViewB Instance of ViewB is created inside ViewA, so ViewA can send message to ViewB's instance, but for the reverse to happen we need to implement delegation (so that using delegate ViewB's instance could send message to ViewA) Follow these steps to implement t...

Move to the SQL Server Management Studio menu bar (ALT) Activate the menu for a tool component (ALT+ HYPHEN) Display the context menu (SHIFT+F) Display the New File dialog box to create a file (CTRL+N) Display the Open Project dialog box to open an existing project (CTRL+SHIFT+0) Display the ...

The ClassLoader needs to provide a ProtectionDomain identifying the source of the code: public class PluginClassLoader extends ClassLoader { private final ClassProvider provider; private final ProtectionDomain pd; public PluginClassLoader(ClassProvider provider) { this...

Applications running in non-development environments often require database updates. After using the Add-Migration command to create your database patches there's the need to run the updates on other environments, and then the test environment as well. Challenges commonly faced are: no Visual S...

To get random data from certain collection refer to $sample aggregation. db.emplyees.aggregate({ $sample: { size:1 } }) where size stands for number of items to select.

Using React.createClass will automatically bind this context (values) correctly, but that is not the case when using ES6 classes. React.createClass Note the onClick declaration with the this.handleClick method bound. When this method gets called React will apply the right execution context to the ...

In order to get the total number of commits that each developer or contributor has made on a repository, you can simply use the git shortlog: git shortlog -s which provides the author names and number of commits by each one. Additionally, if you want to have the results calculated on all branch...

In spark-shell: sc.version Generally in a program: SparkContext.version Using spark-submit: spark-submit --version

Let say you want to build your API to comply jsonapi.org specification and the result should look like: { "article": { "id": "305", "type": "articles", "attributes": { "title": "Asking Alexandria&q...

from pymongo import MongoClient uri = "mongodb://localhost:27017/" client = MongoClient(uri) db = client['test_db'] # or # db = client.test_db # collection = db['test_collection'] # or collection = db.test_collection collection.save({"hello":"world"...

Introduces a while loop. int i = 0; // print 10 asterisks while (i < 10) { putchar('*'); i++; }

import cv2 import numpy as np import urllib stream=urllib.urlopen('http://96.10.1.168/mjpg/video.mjpg') bytes='' while True: bytes+=stream.read(1024) a = bytes.find('\xff\xd8') # JPEG start b = bytes.find('\xff\xd9') # JPEG end if a!=-1 and b!=-1: jpg = bytes[a:b+...

"Fat Model, Skinny Controller" is a very good first step, but it doesn't scale well once your codebase starts to grow. Let's think on the Single Responsibility of models. What is the single responsibility of models? Is it to hold business logic? Is it to hold non-response-related logic? ...