Code Example: Real-Time Pub/Sub
Kuzzle comes equipped with real-time pub/sub capabilities that can be used to send targeted notifications to client applications.
In this code example we will show you how pub/sub works with Kuzzle.
First let's make sure Kuzzle is running and create the index and collection we will use to store documents. Follow these instructions.
Create Your App
Now that we have our Kuzzle configured, we can start programming our App. Here is an outline of what the App will do:
- Connect to Kuzzle
- Subscribe to documents with specific criteria that Kuzzle will monitor
- Publish a document that will trigger the notification
Before we get started on the App, there are a few basics you need to know:
Firstly, a subscription is done at the collection level. This means that Kuzzle will only monitor changes to documents in the specified collection.
Secondly, unlike typical pub/sub solutions, there is no need to create a topic first. In Kuzzle, the topic is replaced by a document
filterwhich is sent by the Client when it makes a subscription request. Clients can subscribe using the same document filter, effectively simulating a
topic. For more information about subscriptions click here