reading-notes

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Event Driven Applications

When implemented effectively, they mitigate the risk of information being accessed without the appropriate authorisation, unlawfully and the risk of a data breach.

If you have application and you need to give access to some of the users to do/reach something and the other uses can’t.
Then you will need to use access control to distinguish between the rights of users

Most large organizations use role-based access control to provide their employees with varying levels of access based on their roles and responsibilities.

To most business applications, RBAC is superior to ACL in terms of security and administrative overhead.
ACL is better suited for implementing security at the individual user level and for low-level data.
while RBAC better serves a company-wide security system with an overseeing administrator.

Every time you interact with a webpage through it’s user interface, an event is happening. When you click a button a click event is triggered. When you press a key a keydown event is triggered.
EventEmitter
- The EventEmitter instance will emit its own ‘newListener’ event before a listener is added to its internal array of listeners.
- Node.js natively provides us with a useful module called EventEmitter that allows us to get started incorporating Event-Driven Programming in our project right away.

const EventEmitter = require('events').EventEmitter;
> const myEventEmitter = new EventEmitter;

lestin

event.on('-event name-', -call back fun-);
callback

events.emit('-event name-', -call back fun-);
To remove event listeners in EventEmitter we can use the removeListener or removeAllListeners method.