Event sourcing your AngularJS applications

Jun 5, 2015Download as PPTX, PDF0 likes193 views

The document discusses event sourcing and its place in a data storage maturity model. Event sourcing involves storing all changes to an application's state as a sequence of events. When commands are executed, events are generated and stored in a database. Projections rebuild the current state by replaying the sequence of events. Event sourcing is considered the most mature approach in the model, above CQRS and structured storage.

Event-Sourcing your
AngularJS applications
MAURICE DE BEIJER - @MAURICEDB

Who am I?
Maurice de Beijer
The Problem Solver
Microsoft Integration MVP
Freelance developer
DevelopMentor instructor
Twitter:@mauricedb
Blog: http://msmvps.com/blogs/TheProblemSolver/
Web: http://www.TheProblemSolver.nl
E-mail: maurice.de.beijer@gmail.com

Event sourcing your AngularJS applications

Data Storage Maturity Model
3 - Event Sourcing
2 - CQRS
1 - Structured storage
0 – Data Dump

(Semi) Structured storage
Database CRUD Server HTTP Browser

Command Query Responsibility Segregation

Command Query Responsibility Segregation
Database
Query Service
Browser
Command Service
Read
Update

Event Sourcing
Projections
Database
Query Service
Browser
Command
Service
Read
UpdateEvents
Database
Projector
Service

This document discusses event sourcing for Angular and React applications. It introduces a data storage maturity model ranging from 0 to 3, with event sourcing being level 3. Level 2 is Command Query Responsibility Segregation (CQRS), which separates read and write operations. Event sourcing stores all state changes as a sequence of events and allows reconstructing the entire state of an application. Projections are used to transform events into data views.

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The document discusses using React applications with event sourcing. It describes event sourcing as storing all state changes as a sequence of events and using these events to build current state through projections. It provides examples of using commands to trigger events, storing events in a database, and projecting events to update state in a Redux store that is then connected to React components to display data.

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