gtrdp / ds2015

Distributed Inventory Systems for Retail Shops

ds2015

Distributed Inventory Systems for Retail Shops

How to

To run this system follow these steps:

1. Go to the server directory and run two LS (the LS will run on port 8079 and 8080):

    $ node ls.js
   

2. Run minimum 1 server. The system is able to run max 9 servers ranging from port 8081 to 8090:

    $ node server.js
   

3. Go to client folder and run the client. Follow the steps on the console.

    $ node client.js
   

To-do

Bugs

• warning: possible EventEmitter memory leak detected. 11 end listeners added. Use emitter.setMaxListeners() to increase limit. [OK]

General

• Test everyting.
• What happens if in the middle of the transaction LS goes down.

Server

• Sync after get new leader. [OK]
• When syncing, make sure who has the lates copy. The latest copy will always win. [OK]
• Coordinate with other server before writing to the database. [OK]

LS

• Fully working LS for LS-Server connection. [OK]
• Detects when the leader goes down. [OK]
• Detect if the resource is not on the list. [OK]
• Reject any incoming request if there is no server running. [OK]

Client

• Client is controllable using keyboard input. [OK]
• Client is able to switch to other LS if the assigned LS is down. [OK]
• Client is able to detect that there is no LS running up. [OK]
• Client is able to handle if in the middle of transaction, ls goes down. Solution: timeout. [Need Testing]

Architecture

• LS is the main hub, for the dynamic discovery of hosts.

Terminal Testing

Use this command to test the code (simulate the client):

	echo "{\"message\": \"request\", \"resource\": \"sugar\", \"amount\": 10}" | nc 127.0.0.1 8079 {"message": "request", "resource": "sugar", "amount": 10}