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https://issues.apache.org/activemq/browse/CAMEL-1638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=51863#action_51863
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Claus Ibsen commented on CAMEL-1638:
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Ups will update the Aggregate EIP wiki page as well.
> AggregatorStrategy - should also be invoked for the first exchange
> ------------------------------------------------------------------
>
> Key: CAMEL-1638
> URL: https://issues.apache.org/activemq/browse/CAMEL-1638
> Project: Apache Camel
> Issue Type: Improvement
> Components: camel-core
> Affects Versions: 2.0-M1, 1.6.1
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Fix For: 2.0.0
>
>
> Using aggregator, splitterl, multicast etc. that supports
> {{AggregatorStrategy}} all have the flaw that they skip invoking this
> interface callback for the very first exchange.
> This hazzles the end users implementing this interface if they are to be able
> to traverse all the exchanges, to eg summing a total amount or the likes.
> And its also a bit confusing as well why the first one is skipped.
> And if you aggregator out of order then you dont know which one was the first
> exchange.
> So we should invoke this callback always. And the first time the
> {{oldExchange}} parameter is null.
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