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Mastering Spring Cloud
book

Mastering Spring Cloud

by Piotr Mińkowski
April 2018
Intermediate to advanced content levelIntermediate to advanced
432 pages
10h 38m
English
Packt Publishing
Content preview from Mastering Spring Cloud

Consuming messages conditionally

Assuming we would like to treat messages incoming to the same message channel differently, we may use conditional dispatching. Spring Cloud Stream supports dispatching messages to multiple @StreamListener methods registered on an input channel, based on a condition. That condition is a Spring Expression Language (SpEL) expression defined in the condition attribute of the @StreamListener annotation:

public boolean send(Order order) {    Message<Order> orderMessage = MessageBuilder.withPayload(order).build();    orderMessage.getHeaders().put("processor", "account");    return this.source.output().send(orderMessage);}

Here's the sample implementation that defines two methods annotated with @StreamListener that listen ...

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Publisher Resources

ISBN: 9781788475433Supplemental Content