aspineon

#!/bin/bash
#title           :wildfly-install.sh
#description     :The script to install Wildfly 10.x
#more            :http://sukharevd.net/wildfly-8-installation.html
#author	         :Dmitriy Sukharev
#date            :2015-10-24T17:14-0700
#usage           :/bin/bash wildfly-install.sh
#tested-version  :10.0.0.CR3
#tested-distros  :Debian 7,8; Ubuntu 15.10; CentOS 7; Fedora 22 

aspineon

// Enable component-scanning and auto-configuration with @SpringBootApplication Annotation
// It combines @Configuration + @ComponentScan + @EnableAutoConfiguration
@SpringBootApplication
public class FooApplication {
  public static void main(String[] args) {
    // Bootstrap the application
    SpringApplication.run(FooApplication.class, args);
  }
}

aspineon

REST API Cheatsheet

Source: https://www.youtube.com/watch?v=5WXYw4J4QOU

• POST, GET, PUT, DELETE != CRUD
• no verbs -> just nouns for Resources: /applications or /applications/123
• Possible Responses: Collection of Resources (e.g. with Links) or One instance of a Resource
• Keep your API course grained to be scaleble to future requirements
• For Resources: Be as specific as possible: /customers vs. /newsletter-customers and /registered-customers
• PUT for Create: Can be used when the Client has the ability to create an identifier for the Resource himself. But it has to contain a full replacement of the dataset: PUT /applications/123

aspineon

Software Engineering

Continous Integration vs. Continous Delivery vs Continous Deployment

• Continous Integration (CI)
  • Code is built + Unit/Integration tested on every check-in
  • Tests are executed on an environment that is downscaled in comparison to the production environment
  • Build artifacts are stored in a version controlled artifact repository
  • Build artifacts of a successful build are automatically deployed on a test environment
  • ... now you are ready for the next Step: Continous Delivery
• Continous Delivery (CDel)
• Your application is deployable every time

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Glossar

• Sidecar - Process that encapsulates required technologies (e.g. logging, monitoring, service discovery, etc.) in the microservices environment and makes them available to microservices that are not able to use those technologies natively
• Immutable Server -

Configuration + Coordination

• Zookeeper - https://zookeeper.apache.org/ - Provides configs in a hierarchical key-value store that is replicated and synchronized across large distributed systems.
• etcd - https://github.com/coreos/etcd - Like Zookeeper. Distributed reliable key-value store for the most critical data of a distributed system. Provides a REST API. It is possible to do locking in a distributed system with it.
• Spring Cloud Config - Provides a REST API. Config files can be based in a Git repo. The config data can be encrypted (e.g. for passwords in config files)

Service Discovery

aspineon

# Move cursor to the beginning of the line
^+a

# Move cursor to the end of the line
^+e

# Delete from cursor to the beginning of the line
^+u

# Delete from cursor to the end of the line

aspineon

# All values are considered "truthy" except for the following, which are "falsy":

None
False
0
0.0
0j
Decimal(0)
Fraction(0, 1)
[] - an empty list

aspineon

# Generate a safe password with node.js
node -e "console.log(require('crypto').randomBytes(256).toString('base64'));"

aspineon

// Simple function
func add(x int, y int) int {
	return x + y
}

// Function that returns 2 values
func swap(x string, y string) (string, string) {
	return y, x
}

aspineon

/*
JPA (Java Persistence API)

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