阻止路线，直到消费者收到消息

Question

I have a route like this:

[producer1]--->[blocker]--->                 
                           |--->[aggregator]---> [consumer]
[producer2]---------------->

Producer1 and producer2 are pushing messages to the aggregator . If there are two messages with the same id then the aggregation is completed and the aggregated message will be routed to a consumer.

Is it possible to block the route after the producer1 sends a message to the aggregator ? Something like wait until the consumer receives the aggregated message .

Answer 1

No this is not possible as the aggregator is two-legged. So what goes out of the aggregator is not linked to what goes in.

You can however build a java bean and use a CountDownLatch and then block after you have called the aggregator, and then signal a count down when you have an outgoing message from the aggregator.