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StrongLoop Quick Start Notes

"Atwood's Law: any application that can be written in JavaScript will eventually be written in JavaScript." -- Jeff Atwood

This are my notes to quick start an application using StrongLoop.

There's a well documented quick start guide at StrongLoop site here: https://docs.strongloop.com/display/public/LB/Getting+started+with+LoopBack

There's a very nice set of examples in the official StrongLoop github repository:

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Very quick start with Ionic, my personal notes.

This is my very quick start guide to ionic development, it contains my notes to quickly became up to speed with an app ready to start coding and basic ionic commands and issues for reference.

Install Android development Environment:

Install ionic & cordova:

• npm install ionic -g
• npm install cordova -g

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Angular 2 quick notes

This are my side notes to quick start an Angular 2 Application and refresh my mind about basic syntax, best practices and structure. Nothing can be better then the official angular 2 documentation to start. To start I recommend to visit the official docs in special the Architecture Overview section.

Getting started basics

• Angular cheat sheet is very usefull.

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import java.util.Map;
import java.util.Random;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ConcurrentMapIteration
{
  private final Map<String, String> map = new ConcurrentHashMap<String, String>();

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Consensus

A fundamental problem and one of the most important abstractions for distributed and multi-agent systems is to achieve overall system reliability in the presence of a number of faulty processes, consensus. This often requires processes to agree on some data value that is needed during computation.

Consensus algorithm requires at least a mojority of nodes to be functioning correctly so that majority can for a quorum. There's a termination property in consensus that is subject to the assumption that fewer than half of the nodes are crashed or unreachable, however, most implementations of consensus ensure that the safety properties - agreement, integrity and validity - are always met, even if the majority of nodes fail or there is a severe network problem, meaning that in case of a large scale outage can stop teh system from being able to process requests, but it cannot corrupt the consensus system by causing it to make invalid decisions.

Putting the aforementioned paragraph in example it means w

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Simple map and flatMap example

reference page

// define a function that maps String to Long
Function<String, Long> toLong = Long::parseLong; 

//aplying the function to the possible string
Optional someString = Optional.of("12L");

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Due to legal reasons the default jdk from oracle does not have strong encryption enabled by default the Java Cryptography Extension (JCE) Unlimited Strength needs to be downloaded and configured.

The following java code can be used to test if your jvm has it configured:

import javax.crypto.Cipher;
import java.security.NoSuchAlgorithmException;

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Quick start tutorial

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 #!/bin/zsh
echo "--------------- Loading mmaia.zsh functions----------------"

function idea() {
  find ~/.local/share/JetBrains/Toolbox/apps/IDEA-U -name "idea.sh" -exec chmod +x {} \; -exec {} $1 \; >/dev/null 2>&1 &
}

function reload() {
    source ~/.zshrc
}

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---
- name: configure local machine sudo
  hosts: localhost
  sudo: yes

  tasks:
  - name: ensure up to date O.S
    command: apt -y update

  - name: install base packages