14_NATS_Streaming_Server_An_Event_Bus_Implementation.md

[Stephen Grider] Microservices with Node JS and React [ENG, 2020]

14. NATS Streaming Server - An Event Bus Implementation

01. What Now

02. Three Important Items

03. Creating a NATS Streaming Deployment

04. Big Notes on NATS Streaming

05. Building a NATS Test Project

$ cd app
$ mkdir nats-test
$ cd nats-test
$ npm init -y
$ npm install --save node-nats-streaming ts-node-dev typescript @types/node

$ tsc --init

06. Port-Forwarding with Kubectl

$ kubectl get pods
NAME                                        READY   STATUS    RESTARTS   AGE
auth-deployment-59d887f775-h9nxq            1/1     Running   0          109m
auth-mongo-deployment-d79ff8f7c-lj92m       1/1     Running   0          109m
client-deployment-65576ffc88-vxvv4          1/1     Running   0          109m
nats-deployment-6bf654c867-cvc2q            1/1     Running   0          109m
tickets-deployment-5c57b69d6c-kbb6c         1/1     Running   0          109m
tickets-mongo-deployment-869f7b4c75-9q48f   1/1     Running   0          109m

$ kubectl port-forward nats-deployment-6bf654c867-cvc2q 4222:4222
$ kubectl port-forward nats-deployment-6bf654c867-cvc2q 8222:8222

$ cd nats-test
$ npm run publish

07. Publishing Events

08. Listening For Data

$ npm run listen

console with publisher: rs + [Enter]

09. Accessing Event Data

10. Client ID Generation

11. Queue Groups

12. Manual Ack Mode

13. Client Health Checks

browser

http://localhost:8222/streaming
http://localhost:8222/streaming/channelsz?subs=1

14. Graceful Client Shutdown

15. Core Concurrency Issues

16. Common Questions

17. [Optional] More Possible Concurrency Solutions

18. Solving Concurrency Issues

19. Concurrency Control with the Tickets App

20. Event Redelivery

21. Durable Subscriptions

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Marley

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