petrjanda / node-cqrs Goto Github PK

In order to make it easier to rebuild structural data view in the application, we need a simple way to purge snapshots for a given view / aggregate.

i want use cqrs at npmjs , can i?

i develop a new cqrs domain project, i like cqrs name.

npm install cqrs

can i use it? make to me?

In order to significantly speedup view fetching, need to implement better way how to store denormalized data in the smaller chunks. Currently each view is stored as separate document (unique key) but we need to implement much better granularity (by different rules).

Example: View with list of events for multiple users in a time
Instead of storing one big bulk and then fetching just part of the view on the app level, we would store view per day and user. This would mean fetching data for particular day and user would be way faster.

The strategy how to split data should be easy to change.

CouchDB is not very good in generating sequences. Instead each id is random generated string. It makes it a bit difficult to order the events then. The easies way is to order by time when event was created, although in some apps, there can be multiple events coming at same mili-second.

Luckily there are solutions in node.js to work with microseconds, thus orders of magnitude more precise solution.

View is the representation of read model in the system. Currently it encapsulate two basic concepts: view building and view reading. After recent updates, we are able to separate those concerns, thus we would have one component responsible to build the view data (orchestrated by denormalizer) and other much simpler component to read it.

View is the representation of read model in the system. Currently it encapsulate two basic concepts: view building and view reading. After recent updates, we are able to separate those concerns, thus we would have one component responsible to build the view data (orchestrated by denormalizer) and other much simpler component to read it.

To speedup aggregate reconstruction, snapshots need to be supported:

https://github.com/petrjanda/node-cqrs/blob/master/lib/repository.js