Cloud Computing

Tags

cloud computing, devops, good-practices

What is Cloud Computing?

R: Cloud computing is a technology that has the concept, basically, the abstraction of resources¹ through Internet.  

¹ – A good example is the email. It’s a communication resource and you can access your email in Brazil, in Canada or elsewhere. Just having access to Internet and to the e-mail service.

Cool, but what can be abstracted?

Basically, everything. Applications, environments, RAM, HD, etc. These abstracted itens are divided into Delivery Models. Cloud Computing has many delivery models, but the most common and the main ones are:

Delivery Models

• IaaS (Infrastructure as a Service)
  

  Abstraction of the Infrastructure.

  • Example in life: Rent a house
    • You do not need to buy materials to build a house from scratch, put electrical wiring and other things. The house is ready and in it you choose what to do.
  • Real example: Servers/Computers in general
    • In IaaS, you do not need to buy a physical computer to do your things. You receive a virtual machine (usually with an operating system that you choose) and do what you want with it. Can use as a server, such as storage, install your programs or anything else that you would do with a computer.
  • Tools:
    • Amazon Web Services (AWS), Microsoft Azure, Google Compute Engine (GCE), etc.

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Test-Driven Development (TDD) – Part 1

Tags

continuous integration, development, devops, good-practices, patterns & practices, tdd, test-driven development

What is TDD?

TDD (Test-Driven Development) is a concept that (as the name says) focuses on test driven development, but what does that mean? It means that for every new feature, each new method, must have created a test before.

Benefits

Among the benefits of testing, the main ones are:

• Reducing the number of bugs
  • There’s much greater confidence that the code does what it should do.

• Elimination of useless code
  • There’s tools that show which parts of the code aren’t being called by tests.

• Cleaner code
  • The development cycle allows refactoring of the code, that, by being developed along with tests, tends to be simple.

• Flexibility
  • To write tests we have to separate the code into small pieces to make them testable, that is, our code will be less coupled.

Development Cycle

TDD has a cycle called Red, Green, Refactor. In summary, it means: