Constellation hands on L4

 

Constellation Building Blocks

Constellation Architecture is made of several building blocks, which work together in harmony to help you crush complexity.

Client device

In traditional Pega UI, server does both the business logic and generating all of the UI markup

But in constellation , user browsers and devices to do the heavy lifting, by utilizing the Constellation orchestration layer.

the client device plays active and vital role, acting as the layer -This includes transforming JSON metadata into HTML code

server load is minimized, creating an even faster and more responsive user experience

Infinity server and DX API

In the Constellation architecture, the Pega Infinity Server acted as a brain holding the business rules, logic, and data, while the orchestration and presentation were handled by the user's device.

Communication between both sides is covered by the use of DX API [case data + UI metadata]

Constellation UI services

 UI-related tasks are separated into two separate services

App-static - a client application-specific UI static content delivery service

UI assets (images, custom components, localizations) authored by clients are application-specific

cloud-based multitenant service or as a deployable service known as the App-Static service

must be safely stored and protected

requires authentication for all APIs (for both read and write). Reading or writing of customer-generated content is covered by the signed token

PEGA CDN - Constellation Pega UI static content

JavaScripts generated by Pega and that are part of Pega Platform
The same service for all clients

can be made publicly available for quick access

read-only and does not require authorization

Messaging Service

the Messaging Service, which realizes a server-to-client push architectural component of Constellation

components-to-topics subscriptions made through the WebSocket connection

Infinity publishes data --> Message Broker through an HTTP REST connection.
The Message Broker then pushes --> browsers that registered

for example, charts that update in real-time, or a bell icon with a badge

Greater than the sum of its parts

The orchestration layer, the Infinity server, and the robust Messaging Service collectively deliver a faster, more responsive, and highly scalable user experience