Producer

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What is a Producer?

A producer is an application that senses state changes (events) and publishes those events as messages. An event indicates a state change or update triggered by a user's/device's action.

The following are sample events:

  • Placing an item in a shopping cart on an e-commerce website.
  • Clicking the subscribe button on a YouTube channel.
  • A temperature change in a sensor.

Why do we need Producers?

One of the core concepts of event-driven architecture is the publish/subscribe communication model. Producers are publishers in this model; they're the first logical layer responsible for distributing messages to the broker so that others can subscribe to receive messages.

The diagram above depicts the communication between a producer publishing events to a specific channel in a broker and a consumer subscribed to the same channel.

In some cases, an entity can be both a producer publishing messages to a specific channel in the broker and a consumer subscribing to messages from a different channel in the broker.

In the diagram above, we see a producer publishing messages to a specific channel and a consumer subscribing to messages from that channel. We also have a second producer who publishes to one channel, but subscribes to messages from another.

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