A producer, also called a publisher, is a messaging component that sends messages to a queue or channel. It does not need to know which subscribers are listening; the message queue separates producers from receiving components. section 21.1
In Redis, a producer publishes to a named channel. Any subscriber using the same channel receives a copy of each message. Producers and subscribers can run independently, so publishing can continue before a subscriber starts listening. section 21.1
Publish messages with Redis in Docker
Create a Redis network and run a background producer that publishes "ping" to channel21 50 times, waiting five seconds between messages. Then run a Redis CLI subscriber on channel21 to observe the messages. The producer logs response codes, while the subscriber prints received message details. section 21.1
# run the Redis client in the background to publish messages: docker run -d --name publisher --network ch21 ` diamol/redis-cli:2e -r 50 -i 5 PUBLISH channel21 ping # check the logs to see messages are being sent: docker logs publisher
Use the runnable Docker command to start a Redis producer and verify its publishing logs. section 21.1
Producers can publish fixed-structure events such as a new-item event. Multiple components can publish the same event, while multiple message handlers subscribe to it, allowing features such as auditing and saving to evolve independently. section 21.4
