lelledaniele

Docker

File Index

1. Installation
2. CMDs
   1. Docker
   2. Container
   3. Image
3. Network

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Left Shift

Multiply x per 2, 4, 6, 8, ...

8<<1 = 8 * 2 = 16
8 in binary is 0001

position: 24 23 22 21 20
binary: 0 1 0 0 0 = 23 = 8

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Problem

Print every number between 1 and 100, However for numbers that are multiples of 3 print "Fizz" and for numbers that are multiples of five print "Buzz". For numbers that are multiples of both 3 and 5 print "FizzBuzz".

Solution

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Notes from my Scrum Master Course

The Scrum Framework

• Stakeholders
• Customers/Users
• Scrum Master
• Dev Team
• Product Owner

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When to use Cassandra

• When we need a database in more than one node
• Huge data
• Data replication
• High Availability and Partitioning. Custom consistency level. CAP_theorem

Features

• We can have the recent version of your data in every node/cluster

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Problem

QA team need to sync multiple folder with same codebase

Solution

• vi ~/.bashrc
• Append the following code (change the project folder)

alias qapush='projectDir=$PWD; branch=$(git branch | sed -n -e '\''s/^\* \(.*\)/\1/p'\''); git push origin $branch; cd ~/PROJECT_FOLDER_TO_SYNC; git fetch origin; git pull origin $branch; cd $projectDir;'

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Rules

• The view should not receive the entity but a DTO (Data Transfer Object)
  • To create a DTO use a DTOBuilder to validate the inputs

Separation of concerns

DIP - Dependency inversion principle

Hexagonal architecture (ports and adapters)

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Why GO?

• Go compiles quickly
• Go supports concurrency out of the box
• Functions are first-class in GO
• Go supports garbage collection out of the box
  • It is active only for the heap memory (blobal).
  • It is not active for the stack memory (Goroutines).
• Go has Strings and Maps built-in

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Timestamp with Audit and Sonata

This GIST helps to have the createdAt and updatedAt fields in your entity populated by AuditBundle and (plus) show them in Sonata

• Setup AuditBundle
• Add the EntityBase and his interface
• Extend the EntityBase in your entity
• Setup the service
• Add the service

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.htaccess

PHP files in upload folder

This htaccess prevent the execution of PHP files

<Files *.php>
    deny from all