Amit Tripathi amitt001

REST Design Important Points:

Use Nouns but no Verbs

Ex: /cars, /cars/23 ... Correct

/getCarData, /get/car/data ... wrong

GET method & query parameter should not alter the state use PUT, POST and DELETE for changing the state
Do not mix up singular and plural nouns use only plural nouns

Functions

List Operations:

++ == extends

:+ == append

OOP and Design Pattern:

Association, Aggregation and Composition:

The distinction between aggregation and composition goes to old times for language like C++ where there is manual memory management. For languages with dynamic memory management everything is compositon.

Association: Multiple objects have their own life cycle and there is no owner. Ex teacher and student, independent life cycle.

Copy(resume) data from localhost to server:

rsync --partial --progress dump.tar.gz wkalt:wkdump

	Subprocess:

	One class Popen and others are wrapper over it.
	shell=True: This argument spawns a new intermediate process and run the command. If False, the command run in current process.

	Popen: non blocking

	subprcess call vs Popen:

	call: is a wrapper over Popen and takes all the pamaters of popen. It is blocking and does not return until process has finished.

	OpenSubtitles.org has apparently updated their servers. That uncovered latent bugs in the very dumb HTTP support of the VLSub extension.

	To work around the problem (you might need administrator privileges):
	Go to the VLC installation directory.
	Look for the file named lua/extensions/VLSub.luac.
	Open that file in a binary or hexadecimal editor. (DO NOT USE a text editor.)
	Look for the character sequence "HTTP/1.1" (without quotes).
	Replace the last one by a zero: "HTTP/1.0".
	Repeat the procedure; there should be a second occurence in the file.
	Save the file.

	# Initialize the scroll
	page = es.search(
	index = 'yourIndex',
	doc_type = 'yourType',
	scroll = '2m',
	search_type = 'scan',
	size = 1000,
	body = {
	# Your query's body
	})

	import sys
	import time

	from kubernetes import config, client


	class KubeControl:
	def __init__(self):
	# config.load_kube_config(context='staging')
	config.load_kube_config()

	version: '2'
	services:
	zookeeper-1:
	image: confluentinc/cp-zookeeper:latest
	hostname: zookeeper-1
	ports:
	- "12181:12181"
	environment:
	ZOOKEEPER_SERVER_ID: 1
	ZOOKEEPER_CLIENT_PORT: 12181

	VBox: http://linoxide.com/linux-how-to/setup-centos-7-vagrant-base-box-virtualbox/
	OR
	Vagrant centos: https://atlas.hashicorp.com/relativkreativ/boxes/centos-7-minimal