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// Performance of entity relations 
https://vladmihalcea.com/2016/06/28/14-high-performance-java-persistence-tips/

// Using UUIDs as primary key
// (This uses the default UUID version 4 (random) strategy according to IETF RFC 4122 rather than version 1 (time-based) strategy)
@Entity(name = "Book")
public class Book {

    @Id
    @GeneratedValue

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# Show status of current changes
git status

# Checkout pull request from GitHub
git fetch origin pull/<id>/head:<local-branchname-for-pr>
git checkout <local-branchname-for-pr>

# Pull latest changes from pull request from GitHub
git pull origin pull/<id>/head:<remote-branchname-for-pr>

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# Cache related HTTP headers should be on the server response.

# Cache file but ask the server on every request if there is a new version of it.
# Mainly used for mutable files such as a bundled app.js or a styles.css file.
# Set the following HTTP headers on the response:
Cache-Control: no-cache
# no-cache means: check whether there is a new version of the file on every request.
# If the cached version is up to date take it. If it's not, fetch the new one.

# To check whether there is a new version of a file

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Talk: https://www.youtube.com/watch?v=-Xn9T8pTbdo

Topics / Words / Concepts / Or what so ever I haven't heard about yet

• http://start.spring.io/

Bounded Context

• Divide Codebase in different Parts
• 1 Bounded Context = 1 Microservice

Microservices

• Pains: DNS + Monitoring + ...

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# The pull command fetches the alpine image from the Docker registry and saves it in our system.
docker image pull alpine

# You can use the docker image command to see a list of all images on your system.
docker image ls

# Run a Docker container based on this image. To do that you are going to use the docker container run command.
# When you call run, the Docker client finds the image (alpine in this case), 
# creates the container and then runs a command in that container.
docker container run alpine ls -l

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# --- Oracle DB ---
# URL - Old syntax
jdbc:oracle:thin:@[HOST][:PORT]:SID
# URL - New syntax
jdbc:oracle:thin:@//[HOST][:PORT]/SERVICE
# driver-class-name
oracle.jdbc.driver.OracleDriver

# --- PostgreSQL ---
# URL

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JSON Web Token

Client - Sends requests to the Server
Server - Doesn't trust a Clients request unless it is authenticated

On Login with Username + Password the Server creates a JWT which is
returned to the Client.

The Client has to store the Token and send it along with any upcoming
request.

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OAuth (Open Authentication)

OAuth Client - e.g. My Server
OAuth Provider - e.g. Facebook Server

1. Register the OAuth Client on the OAuth Provider
2. It gets back an Client ID and a Client Secret
(On FB you do this manually by creating a developer account)
3. We want to authorize a user via the OAuth Provider
   We send to "GET: provider.com/oauth/authorize?" with

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/*
JPA (Java Persistence API)

Transaction Management with an Entity-Mananger:
---
entityManager.getTransaction().begin();
entityManager.persist(<some-entity>);
entityManager.getTransaction().commit();
entityManager.clear();

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# Exclude files or directories from duplication check
sonar.cpd.exclusions=**/AssemblyInfo.cs,**/*.g.cs,**/Mappings/*.cs