GraphQL::Subscriptions plugin is a base class for implementing subscriptions.
Each method corresponds to a step in the subscription lifecycle. See the API docs for method-by-method documentation:
Also, see the Pusher implementation guide, the ActionCable implementation guide or
GraphQL::Subscriptions::ActionCableSubscriptions docs for an example implementation.
Every Ruby application is different, so consider these points when implementing subscriptions:
- Is your application single-process or multiprocess? Single-process applications can store state in memory while multiprocess applications need a message broker to keep all processes up-to-date.
- What components of your application can be used for persistence and message passing?
- How will you deliver push updates to subscribed clients? (For example, websockets, ActionCable, Pusher, webhooks, or something else?)
- How will you handle thundering herds? When an event is triggered, how will you manage database access to update clients without swamping your system?