How Camel 2.11 batch aggregation works with separate route?

Question

First there is a similar unanswered question Joining routes into single aggregator

We have some consumer routes (ftp, file, smb) reading files from remote systems.

Answer 1

You almost have it working. Here is the change you need (and after I will explain).

from("direct:aggregate").id("aggregate")
    .aggregate(property(AGGREGATION_PROPERTY), new BodyInAggregationStrategy())
    .completionSize(property(Exchange.BATCH_SIZE))
    .to("log:result", "mock:result")

The result will be:

Exchange received, body: A+A+A
Exchange received, body: B+B
Exchange received, body: A

Note: You won't receive a result for the "Z" since the batch size is 7.

To explain - as you have read, the Aggregator is a versatile camel component and the key things to define correctly are:

• the aggregation expression
• the completion rule

Now in your case you are aggregating on a property AGGREGATION_PROPERTY which will be A, B or Z. In addition you are specifying a batch size.

However you aren't expressing a completionSize() in your route. Instead you were using completionFromBatchConsumer - which does something different (the code states that it looks for a Exchange#BATCH_COMPLETE property), thus the weird results.

Anyway, .completionSize(Exchange.BATCH_SIZE) will make your test run as desired.

Good luck further.