razorcd

Kafka Topic A, Partition 3 --> Service Instance 2 --> internal Kafka topic +---> Service Instance 1 --> Event stream listener /customer1
                                                                            `--> Service Instance 2

razorcd

                       +----------------------------+
                       | Kafka Topic A, Partition 1 +------.    +--------------+                     +-----------+
                       +----------------------------+       `-->+   Service    |                     |           |
                                                                |  Instance 1  +<---------------+    |           |         API HTTP request
                       +----------------------------+       ,-->+              |                |    |           +<----- Event stream listener
                       | Kafka Topic A, Partition 2 +------`    +--------------+                |    |    API    |            /customer1
                       +----------------------------+                                           +----+  Gateway  |
                                                                +--------------+                     |           |
                       +----------------------------+           |   Service    |DataUp

razorcd

# AWS specific install of Docker
sudo yum update -y
sudo yum install -y docker
sudo service docker start
sudo usermod -a -G docker ec2-user

# exit the SSH session, login again

# Docker
docker run -d --hostname my-rabbit --name some-rabbit -p 4369:4369 -p 5671:5671 -p 5672:5672 -p 15672:15672 rabbitmq

razorcd

    /**
     * Custom emitter.
     */
    @GetMapping(value = "/custom-emitter", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
    public Flux<String> getCustomEmitter() {
        EmitterProcessor<String> hotSource = EmitterProcessor.create();

        Flux<String> hotFlux = hotSource.publish().autoConnect();

razorcd

CREATE

POST localhost:9200/index/type?refresh

{
  "ssoId": "s0000000001",
  "externalSsoType": "U",
  "socketNumber": "s0000000001",
  "deviceNote": null,
 "isTaken": null,

razorcd

-- MIGRATION1: (copy data)

-- create new table
CREATE TABLE cdm.adresses (
  id BIGINT(20) AUTO_INCREMENT PRIMARY KEY,
  enrichment_erp_id BIGINT(20) UNIQUE NOT NULL, 
  latitude DECIMAL(20,6) NOT NULL,
  longitude DECIMAL(20,6) NOT NULL,
  zip_code VARCHAR(20) NOT NULL,
  street VARCHAR(255),

razorcd

Below are the Big O performance of common functions of different Java Collections.


List                 | Add  | Remove | Get  | Contains | Next | Data Structure
---------------------|------|--------|------|----------|------|---------------
ArrayList            | O(1) |  O(n)  | O(1) |   O(n)   | O(1) | Array
LinkedList           | O(1) |  O(1)  | O(n) |   O(n)   | O(1) | Linked List
CopyOnWriteArrayList | O(n) |  O(n)  | O(1) |   O(n)   | O(1) | Array

razorcd

//login as admin using the db where the admin user is defined
mongo --port 27017 -u "admin" -p "admin" --authenticationDatabase "admin"

// or the default:
mongo --port 27017 -u "root" -p "password" --authenticationDatabase "root"

//list all system users:
db.system.users.find()

razorcd

var fs = require('fs');

var content = readFile("19_3_2018log.txt");

var allLines = getLines(content);
console.log("All lines:");
console.log(allLines);
var result = allLines.map(line => parseLineToObject(line));
console.log("Result:");
console.log(result);

razorcd

# add remote repo from another filepath:
git remote add -f springBootSippetsFullRepo ../1/spring-boot-snippets-full-folder

# merge to current master (will not messup original files)
git merge -s ours springBootSippetsFullRepo/master

# move new repo in a subfolder:
git read-tree --prefix=springBootSnippets -u springBootSippetsFull/master

# comit new folder: