play-with-events.md

Play with events

Publish events

Events are published from cqrs().publish(). Where publish take the payload and the metadata as arguments. Both are optionals.

cqrs().publish('eventName', payload, metdata);

Listen events

Events are listened from cqrs().on().invoke(). Where on takes the name of the event as parameter and invoke the callback.

The callback has two arguments:

• the payload, it can be null
• the metadata, it will be never null

cqrs().on('eventName').invoke(function (payload, metadata) {
    // do some stuff with payload and metadata
    // can return a promise
});